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Home >> Jeep >> 2008 >> Commander Base, 3.7 K, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 3 (4.7L Engine (Service Information)) >> Valve Timing >> Timing Chain & Sprockets >> Removal >> Timing Chain And Sprockets

Timing Chain And Sprockets

WARNING: This page is about a different variant/trim than selected.
Fig 1: Engine Top Dead Center (TDC) Indicator Marks
GC0003792Courtesy of CHRYSLER LLC
  1. Disconnect negative cable from battery.
  2. Drain cooling system. Refer to STANDARD PROCEDURE .
  3. Remove right and left cylinder head covers. See REMOVAL .
  4. Remove radiator fan. Refer to REMOVAL .
  5. Rotate engine until timing mark on crankshaft damper aligns with TDC mark on timing chain cover. See Fig 1 (#1 cylinder exhaust stroke).
    Fig 2: Positioning Secondary Chain Onto Camshaft Drive Gear
    GC0003899Courtesy of CHRYSLER LLC
    1 - LEFT CYLINDER HEAD
    2 - RIGHT CYLINDER HEAD
  6. Align the camshaft sprocket, so the "V8" marks are at the 12 o'clock position. See Fig 2.
    Fig 3: Cylinder Head Access Plug Location
    GC0003793Courtesy of CHRYSLER LLC
    1 - RIGHT CYLINDER HEAD ACCESS PLUG
    2 - LEFT CYLINDER HEAD ACCESS PLUG
  7. Remove power steering pump.
  8. Remove access plugs (2) from left and right cylinder heads for access to chain guide fasteners. See Fig 3.
  9. Remove the oil fill housing to gain access to the right side tensioner arm fastener.
  10. Remove crankshaft damper and timing chain cover. See REMOVAL  for crankshaft damper and REMOVAL  for timing chain cover.
    Fig 4: Collapsing & Pinning Primary Chain Tensioner
    GC0003939Courtesy of CHRYSLER LLC
    1 - PRIMARY CHAIN TENSIONER
    2 - ADJUSTABLE PLIERS
    3 - SPECIAL TOOL 8514
  11. Collapse and pin primary chain tensioner. See Fig 4.
    CAUTION: Plate behind left secondary chain tensioner could fall into oil pan. Therefore, cover pan opening.
  12. Remove secondary chain tensioners.
    Fig 5: Locating Crankshaft & Camshaft Position Sensors
    GC0003910Courtesy of CHRYSLER LLC
  13. Remove camshaft position sensor from right cylinder head. See Fig 5.
    Fig 6: Holding Camshaft With Pliers
    GC0003906Courtesy of CHRYSLER LLC
    1 - CAMSHAFT SPROCKET AND CHAIN
    2 - ADJUSTABLE PLIERS
    3 - CAMSHAFT
    CAUTION: Care should be taken not to damage camshaft target wheel. Do not hold target wheel while loosening or tightening camshaft sprocket. Do not place the target wheel near a magnetic source of any kind. A damaged or magnetized target wheel could cause a vehicle no start condition.
    CAUTION: Do not forcefully rotate the camshafts or crankshaft independently of each other. Damaging intake valve to piston contact will occur. Ensure negative battery cable is disconnected to guard against accidental starter engagement.
  14. Remove left and right camshaft sprocket bolts.
  15. While holding the left camshaft steel tube with adjustable pliers, remove the left camshaft sprocket. Slowly rotate the camshaft approximately 15 degrees clockwise to a neutral position. See Fig 6.
    Fig 7: Camshaft Rotation - Right Side
    GC0003912Courtesy of CHRYSLER LLC
    1 - ADJUSTABLE PLIERS
    2 - CAMSHAFT DOWEL
  16. While holding the right camshaft steel tube with adjustable pliers, remove the right camshaft sprocket. Slowly rotate the camshaft approximately 45 degrees counterclockwise to a neutral position. See Fig 7.
  17. Remove idler sprocket assembly bolt.
  18. Slide the idler sprocket assembly and crank sprocket forward simultaneously to remove the primary and secondary chains.
  19. Remove both pivoting tensioner arms and chain guides.
  20. Remove chain tensioner.
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