Timing Chain, Sprockets, Front Cover and Seal

REMOVAL & INSTALLATION

3.0L and 4.0L OHC Engines

1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
2. Remove or disconnect the following:
   • Negative battery cable
   • Engine front cover
   • Rotate the crankshaft and align the timing marks
   • Timing chain tensioner, 4.0L OHC engine only
   • Sprocket bolt
   • Timing chain, camshaft sprocket and crankshaft sprocket as an assembly

   To install:

3. Install or connect the following:
   • Timing chain, camshaft and crankshaft sprockets as an assembly
4. Align the timing marks.
5. Install or connect the following:
   • Timing chain tensioner
   • Sprocket bolt. Torque the bolt to 51 ft. lbs. (70 Nm).
   • Engine front cover
   • Negative battery cable

4.0L OHC Engine

1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
2. Drain the engine oil.
3. Remove or disconnect the following:
   • Negative battery cable
   • Engine from the vehicle
   • Oil pan
   • Engine front cover
   • Cylinder heads
4. Lock the jackshaft tensioner by installing a pin.
   • Jackshaft sprocket and chain assembly
   • Left front cassette retaining bolt
   • Cassette chain and tensioner assembly
   • Rear jackshaft plug from the engine
   • Right rear cassette retaining bolt and spacer
   • Right rear cassette chain and tensioner
   • Timing chain (s)

     Fig. 1: Remove the jackshaft sprocket–4.0L SOHC Engine

   To install:

5. Install or connect the following:
   • Timing chain(s)
   • Right rear cassette chain, tensioner and sprocket
   • Jackshaft sprocket and chain on the engine and remove the tensioner pin
6. Torque the jackshaft sprocket bolt in 2 stages:
   1. 32–35 ft. lbs. (43–47 Nm).
   2. Turn an additional 65 degrees.
7. Install or connect the following:
   • Cylinder heads
   • Front cover
   • Oil pan
   • Engine to the vehicle
   • Negative battery cable
8. Fill the engine with clean oil.
9. Start the vehicle, check for leaks and repair if necessary.

5.0L Engine

1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
2. Drain the engine oil.
3. Remove or disconnect the following:
   • Negative battery cable
   • Engine front cover
4. Rotate the crankshaft and align the timing marks.
5. Remove or disconnect the following:
   • Camshaft sprocket bolt
   • Timing chain, camshaft sprocket and crankshaft sprocket as an assembly

   To install:

6. Install or connect the following:
   • Timing chain, camshaft and crankshaft sprockets as an assembly
7. Align the timing marks.
8. Camshaft sprocket bolt. Torque the bolt to 45 ft. lbs. (61 Nm).
9. Engine front cover
10. Negative battery cable