Toyota
Jeep Cherokee
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Engine » 4.0L engine » Removal and installation
Camshaft bearings

REMOVAL

The camshaft rotates within four steel-shelled, babbitt- lined bearings that are pressed into the cylinder block and then line reamed. The camshaft bearing bores and bearing diameters are not the same size. They are stepped down in 0.254 mm (0.010 inch) increments from the front bearing (largest) to the rear bearing (smallest).

This permits easier removal and installation of the camshaft.

The camshaft bearings are pressure lubricated.

Camshaft end play is maintained by the thrust plate.

(1) Remove the camshaft. Refer to Camshaft in this section for procedure.

NOTE: It is not advisable to attempt to replace camshaft bearings unless special removal and installation tools are available, such as recommended tool 8544 Camshaft Bushing Remover Installer.

(2) Using Special tool, remove the camshaft bearings

INSTALLATION

(1) Inspect the camshaft bearing journals for uneven wear pattern or finish.

(2) Inspect the camshaft lobes and distributor gear for wear.

(3) Inspect the camshaft thrust plate for wear. If the plate shows excessive wear inspect the camshaft oil pressure relief holes in the rear cam jounral. The relief holes must be clean and free of debris.

CAUTION: Make sure outside diameter of number 1 bearing is clean. Make sure that the bearing is properly installed in the engine block, align the oil hole in the bearing with the oil gallery in the bearing bore. Failure to do so will cause inadequate oil supply for the sprockets and timing chain.

(4) Using special tool, install new camshaft bearings.

(5) Lubricate the camshaft with Mopart engine oil supplement, or equivalent.

(6) Carefully install the camshaft to prevent damage to the camshaft bearings (7) Position the thrust plate and install the two retaining screws. Tighten screws to 24 N·m (18 ft.

lbs.).

(8) Install the camshaft sprocket, crankshaft sprocket and timing chain with the timing marks aligned. Install the sprocket bolt.

(9) Tighten the camshaft sprocket bolt and washer to 68 N·m (50 ft. lbs.).

(10) To verify correct installation of the timing chain, turn the crankshaft two full revolutions then position the camshaft sprocket timing mark as shown in (Fig. 66).

(11) Install the timing chain cover refer to the procedure in this section.

    More about «Removal and installation»:

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    Engine mount-rear

    Engine assembly

    Intake and exhaust manifold

    Exhaust manifold-4.0L engine

    Cylinder head cover

    Rocker arms and push rods

    Valve springs and oil seals

    Cylinder head

    Valves and valve springs

    Hydraulic tappets

    Vibration damper

    Timing case cover

    Timing chain and sprockets

    Camshaft

    Camshaft bearings

    Crankshaft main bearings

    Oil pan

    Pistons and connecting rods

    Crankshaft oil seals-rear

    Oil pump

    Timing case cover oil seal

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