Wagoneer L4-150 2.5L VIN E TBI (1990)
Oil Pump: Service and Repair
Inspection
Fig. 17 Checking Oil Pump Gear End Clearance
Fig. 18 Checking Oil Pump Gear To Body Clearance
DISASSEMBLY
1.
Remove pump cover to body retaining screws, then the pump cover.
2.
Measure gear end clearance by positioning Plastigage across the full width of each gear as shown. Reinstall pump cover and torque cover
retaining bolts to 70 inch lbs. Remove cover and determine clearance by comparing compressed Plastigage with scale on Plastigage envelope.
Clearance should be 0.002 - 0.006 inch. If clearance is excessive, replace oil pump.
3.
Measure gear to pump body clearance by inserting a feeler gauge between each gear tooth and the pump body inner wall as shown. Clearance
should be 0.002 - 0.004 inch. If clearance is excessive, replace idler gear, shaft and drive gear assembly.
4.
If checking pressure relief valve, remove pickup tube and screen assembly and position aside. Remove cotter pin, then slide spring retainer, spring
and pressure relief valve plunger out of pump body. If plunger binds during removal, clean or replace plunger as necessary. Relief valve plungers
are available in standard or .010 inch oversizes. When replacing plunger, ensure correct size is installed.
