LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2023 >> Tahoe SSV >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 19 (Engine Mechanical - 3.0L (Lm2) Diesel - Repair Instructions (11 Of 11)) >> Repair Instructions >> Engine Block Overhaul >> Disassemble Procedure

Disassemble Procedure

WARNING: This page is about a different variant/trim than selected.
  1. Remove the EN-52474  Engine Lift Hook Set.
  2. GM5615569Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Place a drain pan underneath the oil pan. Allow the oil to drain completely.

    Oil Pan Drain Plug (1) - Remove

  3. Oil Pan Drain Plug Seal (2) - Remove
  4. Oil Filter (3) - Remove and DISCARD
  5. GM5138644Courtesy of GENERAL MOTORS COMPANY

    Turbocharger Bracket Bolt (1) - Remove

  6. Turbocharger Bracket Nut (2) - Remove [2x]
  7. Turbocharger Bracket Brace (3) - Remove
  8. GM5217574Courtesy of GENERAL MOTORS COMPANY

    Charge Air Cooler Bolt (3) - Remove [5x]

  9. Charge Air Cooler Bracket (4) - Remove
  10. GM5240723Courtesy of GENERAL MOTORS COMPANY

    Thermostat Bypass Pipe Bolt (2) - Remove

  11. Thermostat Bypass Hose Clamp (3) - Release - Hose Clamp Replacement Guidelines - Spring Type
  12. Thermostat Bypass Hose (1) - Remove
  13. GM5134389Courtesy of GENERAL MOTORS COMPANY

    Thermostat Bypass Pipe Bolt (3) - Remove [2x]

  14. Thermostat Bypass Hose Clamp (1) - Release - Hose Clamp Replacement Guidelines - Spring Type
  15. Thermostat Bypass Hose (2) - Remove
  16. Engine Coolant Thermostat Gasket (4) - Remove and DISCARD
  17. GM5134476Courtesy of GENERAL MOTORS COMPANY

    Clip (3) @Exhaust Gas Recirculation Cooler Outlet Pipe - Disengage

  18. Engine Coolant Air Bleed Hose Clamp (1) - Release - Hose Clamp Replacement Guidelines - Spring Type
  19. Engine Coolant Air Bleed Pipe (2) - Remove
  20. GM5138655Courtesy of GENERAL MOTORS COMPANY

    Remove the fuel injector wiring harness connector (1) from the engine coolant air bleed hose.

  21. Remove the wiring harness clip (2) from the engine coolant air bleed hose.
  22. GM5138656Courtesy of GENERAL MOTORS COMPANY

    Engine Coolant Air Bleed Hose Stud (1) - Remove

  23. Engine Coolant Air Bleed Pipe Bolt (3) - Remove
  24. Turbocharger Coolant Feed and Return Pipe Gasket (2, 4) - Remove and DISCARD
  25. GM5138657Courtesy of GENERAL MOTORS COMPANY

    Engine Coolant Outlet Pipe Bracket Bolt (2) - Remove

  26. Engine Coolant Air Bleed Hose (1) - Remove
  27. GM5134623Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Support the exhaust gas recirculation cooler inlet and outlet pipes when applying torque to the bolts.

    Exhaust Gas Recirculation Cooler Bolt (1) @Exhaust Gas Recirculation Cooler Inlet Pipe - Remove [2x]

  28. Exhaust Gas Recirculation Cooler Bolt (2) - Remove
  29. Exhaust Gas Recirculation Outlet Pipe Bolt (3) @Fuel Injection Fuel Feed Pipe Bracket - Remove
  30. Exhaust Gas Recirculation Cooler Outlet Pipe Bolt (4) @Intake Manifold - Remove [2x]
  31. Exhaust Gas Recirculation Cooler Outlet Pipe (5) - Remove
  32. Exhaust Gas Recirculation Pipe Seal (6) - Remove and DISCARD
  33. Exhaust Gas Recirculation Cooler Inlet Pipe Gasket (7) - Remove and DISCARD
  34. GM5208673Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Support the exhaust gas recirculation cooler inlet pipe when applying torque to the bolts.

    NOTE:

    Considering the reduced clearance, carefully remove the bolts to ensure the tool does not contact the pipe.

    Exhaust Gas Recirculation Cooler Bolt (1) - Remove [2x]

  35. Exhaust Gas Recirculation Cooler Inlet Pipe (2) - Remove
  36. Exhaust Gas Recirculation Cooler Inlet Pipe Gasket (3) - Remove and DISCARD
  37. GM5135046Courtesy of GENERAL MOTORS COMPANY

    Oil Level Indicator (2) - Remove

  38. Oil Level Indicator Tube Bolt (3) - Remove [2x]
  39. Clip (4) @Oil Level Indicator Tube - Remove
  40. GM5135048Courtesy of GENERAL MOTORS COMPANY

    Oil Level Indicator Tube (1) - Remove

  41. Oil Level Indicator Seal (2) - Remove and DISCARD
  42. GM5135087Courtesy of GENERAL MOTORS COMPANY
    WARNING:

    The noise cancelling foam component MUST be replaced if it has been exposed to engine fluids. Failure to replace the noise cancelling foam component that has been exposed to engine fluids may result in an engine fire resulting in catastrophic engine damage, and possible injury or death.

    Camshaft Housing Cover Insulator (1) - Remove

  43. GM5135103Courtesy of GENERAL MOTORS COMPANY

    Positive Crankcase Ventilation Hose Clamp (1) - Release [2x] - Hose Clamp Replacement Guidelines - Spring Type

  44. Positive Crankcase Ventilation Hose (2) - Remove
  45. GM5210041Courtesy of GENERAL MOTORS COMPANY

    Exhaust Gas Recirculation Valve Cooling Feed Hose Clamp (1) - Release - Hose Clamp Replacement Guidelines - Spring Type

  46. Exhaust Gas Recirculation Valve Cooling Feed Hose (2) - Remove
  47. GM5135382Courtesy of GENERAL MOTORS COMPANY

    Exhaust Gas Recirculation Valve Bolt (1) - Remove [2x]

  48. Exhaust Gas Recirculation Valve (2) - Remove
  49. Exhaust Gas Recirculation Valve Inlet Gasket (3) - Remove and DISCARD
  50. GM5136702Courtesy of GENERAL MOTORS COMPANY

    Turbocharger Oil Feed Pipe Bolt (7) - Remove [2x]

  51. Turbocharger Oil Feed Pipe Bracket Bolt (9) Remove
  52. Turbocharger Oil Return Pipe Bolt (8) - Remove [2x]
  53. Turbocharger Nut (2, 4) - Remove and DISCARD [3x]
  54. Turbocharger Assembly (1) - Remove
  55. Turbocharger Gasket (3) - Remove and DISCARD
  56. Turbocharger Oil Feed Pipe Gasket (6) - Remove and DISCARD
  57. Turbocharger Oil Return Pipe Gasket (5) - Remove and DISCARD
  58. GM5136722Courtesy of GENERAL MOTORS COMPANY

    Exhaust Manifold Heat Shield Bolt (2) - Remove

  59. Exhaust Manifold Heat Shield (1) - Remove
  60. GM5136724Courtesy of GENERAL MOTORS COMPANY

    Exhaust Manifold Flange Bolt (3) - Remove [12x]

  61. Exhaust Manifold (2) - Remove
  62. Exhaust Manifold Gasket (1) - Remove and DISCARD
  63. GM5136778Courtesy of GENERAL MOTORS COMPANY

    Diesel Glow Plug Wiring Harness (1) @Intake Manifold - Remove

  64. GM5136780Courtesy of GENERAL MOTORS COMPANY

    Intake Manifold Cover Retainer (2) - Remove [2x]

  65. WARNING:

    The noise cancelling foam component MUST be replaced if it has been exposed to engine fluids. Failure to replace the noise cancelling foam component that has been exposed to engine fluids may result in an engine fire resulting in catastrophic engine damage, and possible injury or death.

  66. Intake Manifold Cover (1) - Remove
  67. GM5136785Courtesy of GENERAL MOTORS COMPANY

    Intake Manifold Bolt (2) - Remove [9x]

  68. Intake Manifold (1) - Remove
  69. Intake Manifold Runner Control Valve Gasket (3) Remove and DISCARD [6x]
  70. GM5136803Courtesy of GENERAL MOTORS COMPANY

    Engine Oil Cooler Bolt (1) - Remove [5x]

  71. Engine Oil Cooler (2) - Remove
  72. Engine Oil Cooler Gasket (3) - Remove and DISCARD
  73. Engine Oil Cooler Gasket (4) - Remove and DISCARD
  74. GM5136940Courtesy of GENERAL MOTORS COMPANY

    Engine Coolant Flow Control Valve Bolt (3) - Remove [6x]

  75. Engine Coolant Flow Control Valve (2) - Remove
  76. Engine Coolant Thermostat Housing Gasket (1) - Remove and DISCARD
  77. GM5137110Courtesy of GENERAL MOTORS COMPANY

    Install the EN-49979  Crankshaft Holder (1) with EN-956-1  Extension (3)

  78. Crankshaft Pulley Bolt (2) - Loosen [4x]
  79. GM5133550Courtesy of GENERAL MOTORS COMPANY

    Automatic Transmission Flex Plate Bolt (2) - Remove and DISCARD [8x]

  80. Automatic Transmission Flex Plate (1) - Remove
  81. GM5137110Courtesy of GENERAL MOTORS COMPANY

    Remove the EN-49979  Crankshaft Holder (1) with EN-956-1  Extension (3).

  82. GM5137111Courtesy of GENERAL MOTORS COMPANY

    Crankshaft Pulley Bolt (2) - Remove [4x]

  83. Crankshaft Pulley (1) - Remove
  84. GM5137217Courtesy of GENERAL MOTORS COMPANY

    Water Pump Bolt (6) - Remove [2x]

  85. Water Pump Inlet Pipe (1) - Remove
  86. Radiator Outlet Pipe Seal (2) - Remove and DISCARD
  87. Water Pump Bolt (5) - Remove [4x]
  88. Water Pump (4) - Remove
  89. Water Pump Gasket (3) - Remove and DISCARD
  90. GM5148264Courtesy of GENERAL MOTORS COMPANY

    Engine Front Cover Bolt (1) - Remove [8x]

  91. NOTE:

    It is likely you will bend the crankshaft front oil seal during the removal. Use care to not damage the engine block.

  92. Using the EN-37228  separating tool, loosen the crankshaft front oil seal carefully from the engine block.
  93. Crankshaft Front Oil Seal (2) - Remove and DISCARD
  94. GM5214756Courtesy of GENERAL MOTORS COMPANY

    Crankshaft Pulley Bolt (1) - Install [4x]

  95. Rotate the crankshaft with a suitable tool in the direction of the arrow at the crankshaft pulley bolts (1), until the crankshaft locking divot (2) aligns with the engine block (3).
  96. EN-52586  Crankshaft Fixing Pin (4) - Install
  97. GM5214815Courtesy of GENERAL MOTORS COMPANY

    Wiring Harness Connector (1) @Fuel Injector Wiring Harness - Disconnect [6x]

  98. Retaining Clip (2) @Fuel Injector Wiring Harness - Remove [8x]
  99. Fuel Injector Wiring Harness (3) - Remove
  100. GM5138258Courtesy of GENERAL MOTORS COMPANY

    Push the 6 fuel injection fuel return pipe locking springs (1) in the direction shown and remove the fuel injection fuel return pipe from the fuel injectors.

  101. Fuel Injection Fuel Return Pipe Clip (4) @High Pressure Diesel Fuel Injection Rail - Remove
  102. Unlock the fuel injection fuel return pipe clip (5) by pressing the spring notch in direction of the arrow, and remove the hose from the diesel fuel separator.
  103. Unclip the fuel injection fuel pipe retainer (3) from the high pressure fuel feed pipe.
  104. Fuel Injection Fuel Return Pipe (2) - Remove
  105. Seal Ring (6) - Remove and DISCARD [6x]
  106. GM5138304Courtesy of GENERAL MOTORS COMPANY

    Bolt (1) @Fuel Pump Fuel Feed Hose - Remove

  107. Fuel Feed Hose Connector Retainer (3) - Disengage
  108. Disconnect the fuel pump fuel feed hose (4). Metal Collar Quick Connect Fitting Service
  109. Fuel Pump Fuel Feed Hose (2) - Remove
  110. GM5138347Courtesy of GENERAL MOTORS COMPANY

    Bolt (1) @Diesel Fuel Separator - Remove

  111. Fuel Return Hose Connector Retainer (4) - Disengage
  112. Disconnect the fuel return front pipe (3). Metal Collar Quick Connect Fitting Service
  113. Diesel Fuel Separator (2) - Remove
  114. GM5138370Courtesy of GENERAL MOTORS COMPANY

    High Pressure Diesel Fuel Feed to Rail Pipe (1) @High Pressure Diesel Fuel Injection Rail (5) - Disconnect [2x]

  115. High Pressure Diesel Fuel Feed to Rail Pipe (1) @High Pressure Diesel Fuel Pump (4) - Disconnect [2x]
  116. Fuel Feed Pipe Clip Bolt (2, 3) - Remove [4x]
  117. High Pressure Diesel Fuel Feed to Rail Pipe (1) - Remove and DISCARD [2x]
  118. GM5214969Courtesy of GENERAL MOTORS COMPANY

    Fuel Return Pipe Clip Bolt (1) - Remove [2x]

  119. Fuel Injector Fuel Return Hose Bracket (2) - Remove
  120. GM5138462Courtesy of GENERAL MOTORS COMPANY

    Fuel Injection Fuel Feed and Return Pipe Retainer Bolt (2) - Remove

  121. Fuel Injection Fuel Feed Pipe Bracket (1) - Remove
  122. GM5138448Courtesy of GENERAL MOTORS COMPANY

    High Pressure Diesel Fuel Feed to Injector Pipe (1) - Remove and DISCARD [6x]

  123. GM5138665Courtesy of GENERAL MOTORS COMPANY

    Clip (1) @Diesel Glow Plug Wiring Harness - Unclip [3x]

  124. Electrical Connector (2) @Glow Plug - Disconnect [6x]
  125. Diesel Glow Plug Wiring Harness (3) - Remove
  126. GM5138666Courtesy of GENERAL MOTORS COMPANY

    Fuel Injection Fuel Rail Nut (3) - Remove [3x]

  127. High Pressure Diesel Fuel Injection Rail (2) - Remove
  128. Charge Air Cooler Bracket (1) - Remove
  129. GM5136921Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    If the injector can not be removed by hand, use the EN-52451  Injector Remover to aid in removal.

    Pull out the 6 fuel injectors (2) with the EN-52451  Injector Remover (3) along with the J-6125-1B  Slide Hammer (1).

  130. GM5136923Courtesy of GENERAL MOTORS COMPANY

    High Pressure Diesel Fuel Injector (1) - Remove [6x]

  131. Fuel Injector Seal (2) - Remove and DISCARD [6x]
  132. Fuel Injector Washer (3) - Remove and DISCARD [6x]
  133. GM5222242Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Camshaft housing cover bolts and captured in the camshaft housing cover.

    Camshaft Housing Cover Bolt (1) - Loosen [7x]

  134. Camshaft Housing Cover Bolt (2) - Loosen [3x]
  135. Camshaft Housing Cover Bolt (3) - Loosen [9x]
  136. Camshaft Housing Cover Bolt (4) - Loosen [7x]
  137. GM5138527Courtesy of GENERAL MOTORS COMPANY

    Camshaft Housing (1) - Remove

  138. Camshaft Housing Gasket (2) Remove and DISCARD [2x]
  139. Clean around each of the glow plugs.
  140. GM5138598Courtesy of GENERAL MOTORS COMPANY
    CAUTION:

    Ensure each glow plug is fully intact when removed from the cylinder head. A broken tip could remain within the combustion chamber, which may not be obvious during removal. Damage to the engine may result if a broken glow plug tip remains within the engine.

    NOTE:
    • Glow plugs must be discarded whenever removed, and replaced with NEW.
    • If the cylinder head is removed, the accompanying glow plugs must be discarded and replaced with NEW.
    • Handle with extreme care, do not allow glow plugs to touch each other.
    • Do not use power tools to install glow plugs.
    • Use a suitable, commercially available glow plug socket.
    • Cylinder head removal may be required to retrieve a broken tip.

    Glow Plug (1) - Remove and DISCARD [6x]

  141. Inspect each glow plug tip and ensure the glow plug is not broken. If a broken tip is suspected, inspect the combustion chamber for the glow plug tip.
  142. GM5138708Courtesy of GENERAL MOTORS COMPANY

    Timing Chain Cover Bolt (3) - Remove [4x]

  143. Timing Chain Cover Bolt (4) - Remove [2x]
  144. Timing Chain Upper Cover (1) @Cylinder Head - Remove
  145. Engine Front Cover Locating Pin (2) @Cylinder Head - Remove [2x]
  146. GM5145909Courtesy of GENERAL MOTORS COMPANY

    Timing Chain Cover Bolt (1) - Remove

  147. Timing Chain Cover Bolt (2) - Remove [15x]
  148. NOTE:

    Avoid prying close to the transmission locating pins.

  149. Using a suitable tool at the locations indicated by the arrows to pry, loosen the timing chain lower cover carefully from the engine block.
  150. GM5145911Courtesy of GENERAL MOTORS COMPANY

    Timing Chain Lower Cover (1) - Remove

  151. GM5223852Courtesy of GENERAL MOTORS COMPANY

    Timing Chain Cover Bolt (1) - Remove [2x]

  152. Fuel Pump Access Hole Cover (2) - Remove
  153. Fuel Pump Access Hole Cover Seal (3) - Remove and DISCARD
  154. NOTE:

    Use a suitable rubber or plastic mallet to remove the crankshaft rear oil seal.

  155. Crankshaft Rear Oil Seal (4) - Remove and DISCARD
  156. GM5146036Courtesy of GENERAL MOTORS COMPANY

    Timing Chain Tensioner (2) - Remove

  157. Timing Chain Tensioner Gasket (1) - Remove and DISCARD
  158. GM5146042Courtesy of GENERAL MOTORS COMPANY

    Ensure the EN-52586  Crankshaft Fixing Pin (1) is installed and locking the crankshaft.

  159. GM5146047Courtesy of GENERAL MOTORS COMPANY

    Bolt (1) @ EN-52445-2  Camshaft Tool - Remove

  160. Washer (2) @ EN-52445-2  Camshaft Tool - Remove
  161. O-Ring (3) @ EN-52445-2  Camshaft Tool - Remove
  162. GM5147527Courtesy of GENERAL MOTORS COMPANY

    Ensure that the camshaft notches (1) are in the 12 o'clock position.

  163. If the camshaft notches are not in the 12 o'clock position, remove the EN-52586  Crankshaft Fixing Pin and rotate the crankshaft until the camshaft notch stands in the 12 o'clock position, and the crankshaft aligns with the EN-52586  Crankshaft Fixing Pin locking location.
  164. Install the EN-52586  Crankshaft Fixing Pin with the camshaft notches (1) in the 12 o'clock position.
  165. GM5146210Courtesy of GENERAL MOTORS COMPANY

    Install the EN-52445-2  Camshaft Tool (2) to the camshafts.

  166. Bolt (1) @ EN-52445-2  Camshaft Tool - Install and hand tighten
  167. GM5147541Courtesy of GENERAL MOTORS COMPANY

    Camshaft Sprocket Bolt (3) - Remove and DISCARD

  168. Camshaft Position Sensor Exciter Wheel (1) - Remove
  169. Camshaft Sprocket (2) - Remove
  170. GM5145742Courtesy of GENERAL MOTORS COMPANY

    Timing Chain Guide Bolt (2) - Remove [2x]

  171. Timing Chain Guide (1) - Remove
  172. GM5146077Courtesy of GENERAL MOTORS COMPANY

    Secondary Timing Chain (1) - Remove

  173. GM5146206Courtesy of GENERAL MOTORS COMPANY

    Camshaft Sprocket Bolt (1) - Remove and DISCARD

  174. Camshaft Sprocket (2) - Remove
  175. GM5146210Courtesy of GENERAL MOTORS COMPANY

    Bolt (1) @ EN-52445-2  Camshaft Tool - Remove

  176. Remove the EN-52445-2  Camshaft Tool (2) from the camshafts.
  177. GM5146047Courtesy of GENERAL MOTORS COMPANY

    O-Ring (3) @ EN-52445-2  Camshaft Tool - Install

  178. Washer (2) @ EN-52445-2  Camshaft Tool - Install
  179. Bolt (1) @ EN-52445-2  Camshaft Tool - Install
  180. GM5147442Courtesy of GENERAL MOTORS COMPANY

    Timing Chain Tensioner Shoe Bolt (2) - Remove

  181. Timing Chain Guide (1) - Remove
  182. GM5147734Courtesy of GENERAL MOTORS COMPANY

    Install the EN-52445-1  Camshaft Tool (3) to the camshaft housing.

  183. Check that the tab (1) of the EN-52445-1  Camshaft Tool sits correctly under the camshaft bearing rear cap (2).
  184. Check that the pins (6) of the EN-52445-1  Camshaft Tool sit correctly in the camshafts (5).
  185. Loosely install the 6 bolts (4) of the EN-52445-1  Camshaft Tool.
  186. GM5147723Courtesy of GENERAL MOTORS COMPANY

    Install the EN-52445-2  Camshaft Tool (1) on the camshafts.

  187. GM5147732Courtesy of GENERAL MOTORS COMPANY

    Hand tighten the 6 bolts (1) of the EN-52445-1  Camshaft Tool a half-turn each in sequence shown.

  188. Fig 1: Camshaft Housing Bolts Loosening Sequence
    GM5147726Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Loosen the bolts in sequence as shown.

    Camshaft Housing Bolt (1) - Loosen [16x]

  189. Camshaft Housing Bolt (1) - Remove [16x]
  190. GM5147728Courtesy of GENERAL MOTORS COMPANY

    J-43301  Coil Pack Puller (1) - Install [2x]

  191. GM5147732Courtesy of GENERAL MOTORS COMPANY

    Loosen the 6 bolts (1) of the EN-52445-1  Camshaft Tool a half-turn each in sequence shown, until disengaged from the cylinder head.

  192. GM5147729Courtesy of GENERAL MOTORS COMPANY

    Camshaft Housing (1) - Remove - Use the special tool: J-43301  Coil Pack Puller (2)

  193. Camshaft Housing Gasket (3) - Remove and DISCARD [5x]
  194. Camshaft Housing Gasket (4) - Remove and DISCARD
  195. J-43301  Coil Pack Puller (2) - Remove [2x]
  196. GM5147733Courtesy of GENERAL MOTORS COMPANY

    Bolt (3) @ EN-52445-2  Camshaft Tool - Remove

  197. Washer (2) @ EN-52445-2  Camshaft Tool - Remove
  198. Remove the EN-52445-2  Camshaft Tool (1) from the camshafts.
  199. GM5147734Courtesy of GENERAL MOTORS COMPANY

    Remove the EN-52445-1  Camshaft Tool (3) from the camshaft housing.

  200. GM5140933Courtesy of GENERAL MOTORS COMPANY
    NOTE:
    • Many internal engine components will develop specific wear patterns on their friction surfaces.
    • Components MUST be separated, marked, or organized in a way to ensure the installation to their original location and position. Take precautions in order to prevent interchanging of parts.
    • Tag or mark each part immediately when removed. Indicate the location, direction, or orientation when necessary.

    Valve Rocker Arm (1) and Hydraulic Valve Lash Adjuster (2) - Remove [24x]

  201. GM5140935Courtesy of GENERAL MOTORS COMPANY

    Valve Rocker Arm (1) @Hydraulic Valve Lash Adjuster (2) - Remove [24x]

  202. GM5145486Courtesy of GENERAL MOTORS COMPANY

    Install the EN-47634  Holder (1) to the EN-956  Extension (4).

  203. Using the EN-47634  Camshaft Sprocket Holder to hold the oil pump sprocket (2), loosen the oil pump drive bolt (3).
  204. Remove the EN-47634  Camshaft Sprocket Holder and the EN-956  Extension.
  205. GM5145487Courtesy of GENERAL MOTORS COMPANY

    Oil Pump Drive Bolt (3) - Remove

  206. Oil Pump Sprocket (2) and Timing Belt (1) - Remove
  207. GM5147813Courtesy of GENERAL MOTORS COMPANY

    Push the timing chain guide (1) in direction of the arrow to compress the tensioner piston.

  208. Install one EN-52234  Timing Chain Tensioner Retaining Pin (2) to lock the timing chain tensioner in position.
  209. Timing Chain Tensioner Bolt (3) - Remove [2x]
  210. Timing Chain Tensioner (4) - Remove
  211. GM5150342Courtesy of GENERAL MOTORS COMPANY

    Timing Chain Guide Bolt (2) - Remove [2x]

  212. Timing Chain Guide (1) - Remove - Move in the direction of the arrow.
  213. GM5147858Courtesy of GENERAL MOTORS COMPANY

    Timing Chain Guide (1) - Remove

  214. GM5145520Courtesy of GENERAL MOTORS COMPANY

    Crankshaft Position Sensor Bolt (3) - Remove

  215. Crankshaft Position Sensor (2) - Remove
  216. Crankshaft Position Sensor Seal (1) - Remove and DISCARD
  217. GM5147959Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Install the EN-49979  Holder (1) with the EN-49979-100  Holder Pins (2) to the outer hole pattern.

    Install the EN-49979  Holder (1) with EN-49979-100  Holder Adapter Pins (2) and EN-956-1  Extension (4) to hold the fuel injection pump driven sprocket.

  218. Fuel Injection Pump Bolt (3) - Loosen
  219. Remove the EN-49979  Holder, EN-49979-100  Holder Adapter Pins, and EN-956-1  Extension.
  220. GM5147963Courtesy of GENERAL MOTORS COMPANY

    Fuel Injection Pump Bolt (1) - Remove and DISCARD

  221. GM5147955Courtesy of GENERAL MOTORS COMPANY

    Install the EN-52448-3  nut (2) to the fuel injection pump driven sprocket (3).

  222. Install the EN-52448-2  screw (1) to the fuel injection pump driven sprocket (3).
  223. Using the EN-52448-2  nut (2) and EN-52448-3  screw (3), press out the fuel injection pump sprocket (3).
  224. GM5225531Courtesy of GENERAL MOTORS COMPANY

    Slide the fuel injection pump driven sprocket (1) back slightly and disengage the sprocket from the timing chain (2).

  225. Fuel Injection Pump Driven Sprocket (1) - Remove
  226. Remove the EN-52448-2  screw.
  227. Remove the EN-52448-3  nut.
  228. GM5146042Courtesy of GENERAL MOTORS COMPANY

    EN-52586  Crankshaft Fixing Pin (1) - Remove

  229. GM5146046Courtesy of GENERAL MOTORS COMPANY

    Crankshaft Pulley Bolt (1) - Remove [4x]

  230. GM5147887Courtesy of GENERAL MOTORS COMPANY

    Timing Chain (1) - Remove

  231. GM5145761Courtesy of GENERAL MOTORS COMPANY

    Fuel Injection Pump Bolt (1) - Remove [3x]

  232. GM5145764Courtesy of GENERAL MOTORS COMPANY

    High Pressure Diesel Fuel Pump (1) - Remove

  233. Fuel Pump Seal (2) - Remove and DISCARD
  234. Fig 2: Cylinder Head Bolts Loosening Sequence
    GM5149797Courtesy of GENERAL MOTORS COMPANY

    Cylinder Head Bolt (1, 2) - Loosen the bolts in the sequence shown. [17x]

  235. Cylinder Head Bolt (1) - Remove and DISCARD [14x]
  236. Cylinder Head Bolt (2) - Remove [3x]
  237. GM5149800Courtesy of GENERAL MOTORS COMPANY

    Cylinder Head (1) - Remove

  238. Cylinder Head Gasket (2) - Remove and DISCARD
  239. GM5145845Courtesy of GENERAL MOTORS COMPANY

    Oil Pan Bolt (1) - Remove [23x]

  240. GM5145847Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Ensure that the two lower crankcase extension pins (3) do not get damaged while loosening.

    Use the EN-37228  Separating Tool (1) to carefully loosen the lower oil pan (2) evenly all the way around. Avoid the locations near the lower crankcase extension pins.

  241. GM5145851Courtesy of GENERAL MOTORS COMPANY

    Lower Oil Pan (1) - Remove and DISCARD

  242. GM5148146Courtesy of GENERAL MOTORS COMPANY

    Disconnect the electrical connector. (1)

  243. Oil Pump Bolt (2, 3) - Remove [4x]
  244. GM5148144Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Ensure that the pump shaft coupling is aligned vertically, parallel with the oil pump bolts.

    Oil Pump (1) - Remove

  245. Oil Pump Gasket (2, 3) - Remove and DISCARD [2x]
  246. GM5148168Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Components MUST be separated, marked, or organized in a way to ensure the installation to their original location and position. Take precautions in order to prevent interchanging of parts.

    Lower Crankcase Extension Bolt - M6 (1) - Remove

  247. Lower Crankcase Extension Bolt - M6 (2) - Remove [12x]
  248. Lower Crankcase Extension Bolt - M6 (3) - Remove
  249. Lower Crankcase Extension Bolt - M8 (4) - Remove and DISCARD [7x]
  250. GM5148165Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Ensure that the two lower crankcase extension pins (2, 4) do NOT get damaged while loosening.

    Use the EN-37228  Separating Tool (3) to carefully loosen the lower crankcase extension (1) evenly all the way around. Avoid the lower crankcase extension pin locations.

  251. GM5148167Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Pry carefully at the locations as shown (1, 3).

    Lower Crankcase Extension (2) - Remove

  252. Upper Oil Pan Gasket (4) - Remove and DISCARD
  253. Oil Pump Gasket (5) - Remove and DISCARD
  254. GM5148415Courtesy of GENERAL MOTORS COMPANY
    NOTE:
    • Many internal engine components will develop specific wear patterns on their friction surfaces.
    • Components MUST be separated, marked, or organized in a way to ensure the installation to their original location and position. Take precautions in order to prevent interchanging of parts.
    • Tag or mark each part immediately when removed. Indicate the location, direction, or orientation when necessary.
    • The shear surfaces of the connecting rod and the connecting rod cap form a unique fit and must not be swapped or damaged. Do not lay down on the shear surfaces.

    Remove and DISCARD the 4 connecting rod bearing cap bolts (3, 4) from cylinder 2 and cylinder 5.

  255. Remove the 2 connecting rod caps (2) from cylinder 2 and cylinder 5.
  256. Remove the 2 connecting rod lower bearings (1).
  257. GM5148416Courtesy of GENERAL MOTORS COMPANY

    Push the 2 pistons (1, 2) with the 2 connecting rods out of cylinder 2 and cylinder 5.

  258. Remove the 2 connecting rod upper bearings (3, 4).
  259. Turn the crankshaft 120 degrees.
  260. GM5148417Courtesy of GENERAL MOTORS COMPANY

    Remove and DISCARD the 4 connecting rod bearing cap bolts (3, 4) from cylinder 1 and cylinder 6.

  261. Remove the 2 connecting rod caps (2) from cylinder 1 and cylinder 6.
  262. Remove the 2 connecting rod lower bearings (1).
  263. GM5148421Courtesy of GENERAL MOTORS COMPANY

    Push the 2 pistons (1, 2) with the 2 connecting rods out of cylinder 1 and cylinder 6.

  264. Remove the 2 connecting rod upper bearings (3, 4).
  265. Turn the crankshaft 120 degrees.
  266. GM5148422Courtesy of GENERAL MOTORS COMPANY

    Remove and DISCARD the 4 connecting rod bearing cap bolts (4) from cylinder 3 and cylinder 4.

  267. Remove the 2 connecting rod caps (3, 5) from cylinder 3 and cylinder 4.
  268. Remove the 2 connecting rod lower bearings (1, 2).
  269. GM5148425Courtesy of GENERAL MOTORS COMPANY

    Push the 2 pistons (1, 2) with the 2 connecting rods out of cylinder 3 and cylinder 4.

  270. Remove the 2 connecting rod upper bearings (3, 4).
  271. GM5148472Courtesy of GENERAL MOTORS COMPANY
    NOTE:
    • Many internal engine components will develop specific wear patterns on their friction surfaces.
    • Components MUST be separated, marked, or organized in a way to ensure the installation to their original location and position. Take precautions in order to prevent interchanging of parts.
    • Tag or mark each part immediately when removed. Indicate the location, direction, or orientation when necessary.

    Crankshaft Bearing Cap Bolt (1) - Remove [14x]

  272. Crankshaft Bearing Cap (2) - Remove [7x]
  273. GM5148474Courtesy of GENERAL MOTORS COMPANY
    NOTE:
    • Mind the guide lug (2) for the installation procedure.
    • Mark the installation position of the crankshaft lower bearing. Lay aside in order removed.

    Crankshaft Lower Bearing (1) @Crankshaft Bearing Cap (3) - Remove [7x]

  274. GM5148468Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Mark the installation position of the crankshaft upper bearings and the crankshaft thrust bearings. Lay aside in order removed.

    Crankshaft (1) - Remove

  275. Crankshaft Upper Bearing (3) - Remove [7x]
  276. Crankshaft Thrust Bearing (2) - Remove [2x]
  277. GM5148958Courtesy of GENERAL MOTORS COMPANY

    Cylinder Head Locating Pin (1, 2) - Remove [2x]

  278. Transmission Locating Pin (3, 5) - Remove [2x]
  279. Engine Block Core Hole Plug (4) - Remove
  280. Engine Coolant Temperature Sensor (8) - Remove [2x]
  281. Seal@Engine Coolant Temperature Sensor (7) - Remove and DISCARD [2x]
  282. Engine Coolant Heater (9) - Remove
  283. Seal@Engine Coolant Heater (6) - Remove and DISCARD
  284. GM5148961Courtesy of GENERAL MOTORS COMPANY

    Engine Block Core Hole Plug (1) - Remove

  285. Engine Front Cover Locating Pin (2) - Remove [2x]
  286. Water Pump Plug (4) - Remove
  287. Starter Locating Pin (3) - Remove [2x]
  288. GM5148959Courtesy of GENERAL MOTORS COMPANY

    Bolt@Piston Oil Nozzle (2) - Loosen [6x]

  289. Piston Oil Nozzle (1) - Remove [6x]
  290. Remove any old thread sealant, gasket material, or sealant.