Jeep Cherokee (XJ): Disassembly and assembly. Cleaning and inspection. Specifications

Rocker arms and push rods

CLEANING

Clean all the components with cleaning solvent.

Use compressed air to blow out the oil passages in the rocker arms and push rods.

INSPECTION

Inspect the pivot surface area of each rocker arm.

Replace any that are scuffed, pitted, cracked or excessively worn

Inspect the valve stem tip contact surface of each rocker arm and replace any rocker arm that is deeply pitted.

Inspect each push rod end for excessive wear and replace as required. If any push rod is excessively worn because of lack of oil, replace it and inspect the corresponding hydraulic tappet for excessive wear.

Inspect the push rods for straightness by rolling them on a flat surface or by shining a light between the push rod and the flat surface.

A wear pattern along the length of the push rod is not normal. Inspect the engine cylinder head for obstruction if this condition exists.

Engine cylinder head

CLEANING

Thoroughly clean the engine cylinder head and cylinder block mating surfaces. Clean the intake and exhaust manifold and engine cylinder head mating surfaces. Remove all gasket material and carbon.

Check to ensure that no coolant or foreign material has fallen into the tappet bore area.

Remove the carbon deposits from the combustion chambers and top of the pistons.

INSPECTION

Use a straightedge and feeler gauge to check the flatness of the engine cylinder head and block mating surfaces.

Cylinder block

CLEANING

Thoroughly clean the oil pan and engine block gasket surfaces.

Use compressed air to clean out:

•  The galley at the oil filter adaptor hole, the filter bypass hole (Fig. 89).
•  The front and rear oil galley holes (Fig. 90) (Fig. 91).
•  The feed holes for the crankshaft main bearings.

Once the block has been completely cleaned, apply Mopart Thread Sealant with Teflon to the threads of the front and rear oil galley plugs. Tighten the plugs to 41 N·m (30 ft. lbs.) torque.

INSPECTION

Inspect the cylinder bores for signs of scorring, pitting or cracks. If the cylinder bores are scorred or pitted the cylinder bores will require boreing or honing to clean them up. Refer to Honing Cylinder Bores in this Section. If the cylinder bore(s) are cracked the cylinder block must be replaced.

Inspect the cylinder block to cylinder head mating surface for flatness and/or pitting.

Fig. 89 Oil Filter Adaptor Hole

1 - FILTER BYPASS HOLE
2 - OIL FILTER ADAPTOR HOLE

Fig. 90 Front Oil Galley Hole

1 - FRONT OIL GALLEY HOLE

Fig. 91 Rear Oil Galley Hole

1 - REAR OIL GALLEY HOLE

Engine specifications

ENGINE DESCRIPTION

Specifications-torque

TORQUE CHART 2.5L ENGINE