Jeep Cherokee

 Service Manual

Engine » 4.0L engine » Removal and installation
Crankshaft oil seals-rear

The crankshaft rear main bearing oil seal consists of two half pieces of viton with a single lip that effectively seals the rear of the crankshaft. Replace the upper and lower seal halves as a unit to ensure leakfree operation.

REMOVAL

(1) Remove transmission inspection cover.

(2) Remove oil pan. Refer to procedure in this section (3) Remove main bearing cap brace.

(4) Remove rear main bearing cap (No.7).

(5) Push upper seal out of the groove. Ensure that the crankshaft and seal groove are not damaged.

(6) Remove lower half of the seal from the bearing cap.

INSTALLATION

(1) Wipe the seal surface area of the crankshaft until it is clean.

(2) Apply a thin coat of engine oil.

(3) Coat lip of the seal with engine oil.

(4) Carefully position the upper seal into the groove in the cylinder block. The lip of the seal faces toward the front of the engine.

(5) Apply Mopart Gasket Maker sealer on both sides of cylinder block as shown in (Fig. 80). The dab of sealer should be 3 mm (0.125 in.) in diameter.

(6) Apply Mopart Gasket Maker on the rear bearing cap (Fig. 80). The bead should be 2.3 mm (0.09 in.) in diameter. DO NOT apply sealer to the lip of the seal.

(7) Position the lower seal into the bearing cap recess and seat it firmly. Be sure the seal is flush with the cylinder block pan rail.

(8) Coat the outer curved surface of the lower seal with soap and the lip of the seal with engine oil.

(9) Install the rear main bearing cap. DO NOT strike the cap more than twice for proper engagement.

(10) Tighten all main bearing bolts to 108 N·m (80 ft. lbs.) torque.

(11) Install the main bearing cap brace. Tighten nuts to 47 N·m (35 ft. lbs.).

(12) Install the oil pan gasket and oil pan. Tighten 1/4 - 20 screws to 14 N·m (120 in. lbs.). Tighten 5/16 - 18 screws to 18 N·m (156 in. lbs.)

Fig. 80 Location of Sealer

1 - DOWEL
2 - SEALER LOCATIONS
3 - CYLINDER BLOCK
4 - HALFWAY BETWEEN
5 - REAR FACE OF CYLINDER BLOCK
6 - 3mm (0.125 in.)

(13) Apply Mopart Silicone Rubber Adhesive Sealant on cylinder block to rear main bearing cap corners and cylinder block to front cover joints (four places) (Fig. 81)

Fig. 81 Oil Pan Sealer Location

1 - SEALER LOCATIONS

(14) Install transmission inspection cover.

Engine mounts-front

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