Remove the face plate mounting bolts and remove the face plate from the oil pump housing. See Figure
1. Face Plate Mounting Bolt
4. Pump Drive Gear
2. Face Plate
5. Pump Housing
3. Idler Gear
6. Drive Wheel
Oil Pump (exploded view)
Remove the idler gear from the pump housing.
Using an appropriate drift, press the drive wheel off the pump drive gear.
Remove the pump drive gear from the pump housing.
Inspect the idler gear, pump drive gear, face plate, and pump housing for damage and excessive wear. Replace any worn or damaged parts.
If either the idler gear or pump drive gear needs replacing, replace both gears as a set.
Check the idler and pump drive gears. Check their seats in the pump housing and face plate. Listed in Table
are the acceptable limits.
Diameter of Shaft Seat (in pump housing and face plate)
Diameter of Idler Gear and Pump Drive Gear Shaft
Clearance of Pump/Idler Gear to Walls of Pump Housing
Gear Backlash (clearance between gear cogs)
Oil Pump Inspection Limits
In the pump housing, measure the diameter of both gear seats, the idler gear seat and the pump drive gear seat. If the measurements are not within acceptable limits, replace the pump housing.
Measure the diameter of both shaft seats in the face plate. If the measurements are not within acceptable limits, replace the face plate.
Measure the diameter of the pump drive gear shaft and the idler gear shaft. If the measurements are not within acceptable limits, replace both gears as a set.
Using a feeler gauge, measure the clearance between the gears and the pump housing wall. If the measurements are not within acceptable limits, replace both gears as a set.
Using a feeler gauge, measure gear backlash (the clearance between two adjacent cogs on different gears). If the measurements are not within acceptable limits, replace both gears as a set.
Oil Pump Assembly
Assemble the oil pump unit as follows:
To avoid injury from burning, use lifting tools and heat-resistant gloves when handling heated components.
Heat the drive wheel to approximately 176F (80C) in a hot water tank.
Seat the pump drive gear in the pump housing. Using an appropriate drift, press in the heated drive wheel until the pump drive gear projects slightly past the top of the drive wheel. See Figure
1. Pump Drive Gear
2. Drive Wheel
Positioning the Drive Wheel on the Pump Drive Gear
Using a feeler gauge, measure the projection of the pump drive gear. Adjust the position of the pump drive gear until the projection equals 0.5 mm (0.02 inch), as listed in Table
Projection of Pump Drive Gear
Pump/Idler Gear End Play
Oil Pump Installation Specifications
Seat the idler gear in the pump housing.
Install the face plate on the pump housing. Tighten the mounting bolts 25 Nm (18 lbft).
Using a dial gauge, measure the end play of the pump drive gear and idler gear against the walls of the pump housing. See Figure
for set-up and listed in Table
are the specifications.
1. Dial Gauge
3. Oil Pump
Measuring the Clearance of the Pump Drive Gears
Secure the assembled oil pump in a vise, with the face plate pointing up.
Rest the dial gauge support on the face plate.
Set up the dial gauge so that the feeler on the end of the gauge touches the exposed end of the pump drive gear with some preload.
Force the pump drive gear downward as far as it will go.
At this position, adjust the scale of the dial gauge to "0" (zero).
Now force the pump drive gear upward as far as it will go. Read the measurement on the dial gauge and make sure it conforms to the range listed in Table
. Replace the pump, if necessary.
Coat the contact surface between the block and the oil pump with Loctite 574.
Position the oil pump on the cylinder block. Make sure the teeth on the drive wheel of the oil pump mesh with the teeth of the crankshaft drive gear. Tighten the oil pump mounting bolt 35 Nm (26 lbft).
It may be necessary to rock the pump counterclockwise so the teeth of the drive wheel can properly align with the crankshaft drive gear.
Install the pressure limiting valve on the oil pump. Tighten the valve mounting bolt 35 Nm (26 lbft).
Install the sump pipe. Tighten all mounting bolts 25 Nm (18 lbft).
Install the sump pipe bracket on the cylinder block.
Install the sump pipe, with a new gasket, on the oil pump.