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Home >> GMC >> 2005 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> Engine Mechanical - 4.8L, 5.3L & 6.0L (Repair Instructions - 2 Of 3) >> Off-Vehicle Repair Instructions - Part 2 >> Piston and Connecting Rod Assemble

Piston and Connecting Rod Assemble

    Fig 1: Assembling Piston & Connecting Rod
    GM1552566Courtesy of GENERAL MOTORS CORP.
  1. Assemble the piston and connecting rod with the lug (1) on the bottom of the piston and the tab (2) on the side of the connecting rod facing the same direction.

    When installing the piston and connecting rod assembly, the mark on the top of the piston and the tab (2) on the side of the connecting rod should face the front of the engine.

    2. Fig 2: View Of Retaining Clip In Pin Bore Groove
    GM1366372Courtesy of GENERAL MOTORS CORP.
  2. Install the retainer. The retainer should be seated in the groove of the pin bore.
    3. Fig 3: View Of Piston Pin, Piston, Clips & Connecting Rod
    GM35866Courtesy of GENERAL MOTORS CORP.
  3. Install the piston pin to the piston and connecting rod.
  4. Install the retainer. The retainer should be seated in the groove of the pin bore.
    5. Fig 4: View Of Upper/Lower Compression Rings & Marks
    GM1336810Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: When installing piston rings, use a ring expander plier type tool. Do not roll the rings into the grooves of the piston. Use caution and care to expand the rings only slightly larger than the outside diameter (OD) of the piston.
  5. Identify the compression and oil control rings for proper installation. The upper compression ring can be identified by a paint mark (3) located 180 degrees from the end gap. The lower compression ring can be identified by a paint mark (3) located 90 degrees from the end gap. Both rings should be installed with the orientation marks (1, 2) facing the top of the piston.
    6. Fig 5: Removing/Installing Piston Rings
    GM490763Courtesy of GENERAL MOTORS CORP.
  6. Using piston ring pliers, install the piston rings onto the piston.
  7. Position the oil control ring end gaps a minimum of 25 mm (1.0 in) from each other.
  8. Position the compression ring end gaps 180 degrees opposite each other.
    9. Fig 6: Identifying Piston & Connecting Rod Components
    GM1522258Courtesy of GENERAL MOTORS CORP.
  9. Install the connecting rod bearings (104) to the rod (105) and cap (103).
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