Jeep 1996 Grand Cherokee Service Manual - page 1014
OIL PUMP
DISASSEMBLE
(1) Remove the relief valve as follows:
(a) Remove cotter pin. Drill a 3.175 mm (1/8
inch) hole into the relief valve retainer cap and
insert a self-threading sheet metal screw.
(b) Clamp screw into a vise and while support-
ing oil pump, remove cap by tapping pump body
using a soft hammer. Discard retainer cap and
remove spring and relief valve (Fig. 58).
(2) Remove oil pump cover (Fig. 59).
(3) Remove pump outer rotor and inner rotor with
shaft (Fig. 59).
(4) Wash all parts in a suitable solvent and inspect
carefully for damage or wear.
ASSEMBLE
(1) Install pump rotors and shaft, using new parts
as required.
(2) Position the oil pump cover onto the pump
body. Tighten cover bolts to 11 N·m (95 in. lbs.)
torque.
(3) Install the relief valve and spring. Insert the
cotter pin.
(4) Tap on a new retainer cap.
(5) Prime oil pump before installation by filling
rotor cavity with engine oil.
CYLINDER BLOCK
DISASSEMBLE
Engine assembly removed from vehicle:
(1) Remove the cylinder head.
(2) Remove the oil pan.
(3) Remove the piston and connecting rod assem-
blies.
ASSEMBLE
(1) Install the piston and connecting rod assembly.
(2) Install the oil pan.
(3) Install the cylinder head.
(4) Install the engine into the vehicle.
CLEANING AND INSPECTION
CYLINDER HEADS
CLEANING
Clean all surfaces of cylinder block and cylinder
heads.
Clean cylinder block front and rear gasket surfaces
using a suitable solvent.
INSPECTION
Inspect all surfaces with a straightedge if there is
any reason to suspect leakage. If out-of-flatness
exceeds 0.00075 mm/mm (0.00075 inch/inch) times
the span length in inches in any direction, either
replace head or lightly machine the head surface.
FOR EXAMPLE: A 305 mm (12 inch) span is
0.102 mm (0.004 inch) out-of-flat. The allowable out-
Fig. 57 Testing Valve Spring for Compressed
Length
Fig. 58 Oil Pressure Relief Valve
Fig. 59 Oil Pump
ZJ
5.2L ENGINE
9 - 77
DISASSEMBLY AND ASSEMBLY (Continued)