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Home >> Jeep >> 2007 >> Commander Limited, 5.7 2, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (3.7L Engine (Service Information)) >> Valve Timing >> Chain & Sprockets-Timing >> Removal >> Timing Chain And Sprocket

Timing Chain And Sprocket

WARNING: This page is about a different variant/trim than selected.
Fig 1: Engine Top Dead Center (TDC) Indicator Mark
GC0011859Courtesy of CHRYSLER LLC
1 - TIMING CHAIN COVER
2 - CRANKSHAFT TIMING MARKS
  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 (2) on crankshaft damper aligns with TDC mark on timing chain cover (1).
    Fig 2: Camshaft Sprocket V6 Marks (#1 TDC, Exhaust Stroke)
    GC0011861Courtesy of CHRYSLER LLC
  6. Make sure the camshaft sprocket "V6" marks (1) are at the 12 o'clock position (No. 1 TDC exhaust stroke).
  7. Remove power steering pump. Refer to REMOVAL .
    Fig 3: Cylinder Head Access Plugs
    GC0011858Courtesy of CHRYSLER LLC
    1 - RIGHT CYLINDER HEAD ACCESS PLUG
    2 - LEFT CYLINDER HEAD ACCESS PLUG
  8. Remove access plugs (1 and 2) from left and right cylinder heads for access to chain guide fasteners.
  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  or REMOVAL .
  11. Collapse and pin primary chain tensioner.
    CAUTION: Plate behind left secondary chain tensioner could fall into oil pan. Therefore, cover pan opening.
  12. Remove secondary chain tensioners.
    Fig 4: Camshaft Position Sensor
    GC0011860Courtesy of CHRYSLER LLC
    1 - CYLINDER HEAD
    2 - CAMSHAFT POSITION SENSOR
    3 - SCREW
  13. Remove camshaft position sensor (2).
    Fig 5: Special Tool 8428
    GC0011862Courtesy of CHRYSLER LLC
    1 - Camshaft hole
    2 - Special Tool 8428
    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 Camshaft Holder 8428 (2), remove the left camshaft sprocket. Slowly rotate the camshaft approximately 5 degrees clockwise to a neutral position.
  16. While holding the right camshaft steel tube with Camshaft Holder 8428 (2), remove the right camshaft sprocket.
  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 primary chain tensioner.
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