Oil Pump: Service and Repair

Fig. 20 Exploded View Of Oil Pump.:

TOOLS REQUIRED (or equivalents)
^ J 21882, Oil suction pipe installer.

DISASSEMBLY
1. Remove oil pump as described previously in Removal / Installation.
2. Remove pump cover screws and pump cover, (Figure 20).
3. Mark gear teeth so they can be reassembled with same teeth indexing, then remove idler gear, drive gear and driveshaft.
4. Remove pressure relief valve retaining pin, pressure relief valve and related parts.
5. If pickup screen and pipe require replacement, mount pump in a soft-jawed vise and extract the pump screen.

NOTE: Pump screen and pipe are serviced as one assembly. Do NOT disturb pump screen on pipe.

INSPECTION
Wash all parts in cleaning solvent and dry with compressed air and inspect pump body and cover for cracks and excessive wear.
^ Inspect pump gears for damage or excessive wear.
^ Check drive gear shaft for looseness in pump body.
^ Inspect inside of pump cover for wear that would allow oil to leak past the ends of the gears.
^ Inspect pickup screen and pipe assembly for damage to screen, pipe or relief grommet.
^ Check pressure regulator valve for fit in pump housing.

NOTE: The pump gears and body are not serviced separately. If the pump gears or body are damaged or worn, the pump assembly should be replaced.

ASSEMBLY
1. Install the pickup screen and pipe, if previously dissembled, to pump cover.
^ Mount oil pump cover in a soft-jawed vise, apply sealer to end of pipe and tap into place using J21882 and a plastic faced mallet.
2. Install pressure relief valve and related parts.
3. Install the oil pump driven gear and driveshaft assembly to pump housing.
4. Install the idler gear to pump housing with the smooth side of gear toward pump cover.
5. Install the pump cover and screws then torque to 9 Nm (80 in lbs).

INSPECTION
Turn drive shaft by hand to check for smooth operation.