CHECK PUMPING GEAR BACKLASH
1. Mount dial indicator with plunger resting against side of
2. Hold idler gear stationary. Slowly rotate drive gear
back and forth until contact with idler gear is left.
If backlash is not within 0.33--0.22 mm
(0.013-0.079 in.) specification, there is excessive
pumping gear wear and/or idler shaft and gear bushing
wear. If there is less than 0.33 mm (0.013 in.)
backlash, re-clean gears and check backlash again.
3. Replace oil pump if pumping gear backlash exceeds
2.00 mm (0.079 in.).
Checking Backlash of Pumping Gear
NOTE: Oil pump does not need to be removed from
engine, when inspecting drive gear.
Inspect drive gear teeth for chips, cracks, or wear.
Replace as necessary.
Inspecting Pump Drive Gear