Oil Pump

PUMP-OIL
DISASSEMBLY





1. Remove pump gears (1 and 2) from pump housing.





2. Remove the inner oil pump seal (1).
3. Replace the outer oil pump O-ring (2).

INSPECTION
Before measuring any oil pump components, perform a thorough visual inspection of all the components. If any sign of scoring, scratches, or other damage is seen, replace the oil pump as an assembly.

SIDE CLEARANCE
Side clearance is the difference between the thickness of the pump gears and the depth of the pocket in the pump housing. Side clearance can be measured by laying a flat plate across the mounting face of the pump housing, and measuring the distance between the plate and the gears.
Acceptable side clearance:
^ Inner gear: 0.064 mm (0.0025 inch) max
^ Outer gear: 0.069 mm (0.0027 inch) max

TIP CLEARANCE





Tip clearance is the difference between the tip diameters of the gear teeth and the corresponding diameters of the pocket in the pump housing.
Tip clearance for the inner gear can be checked by moving the inner gear into tight mesh (2) with the outer gear as shown. Clearance between the ID of the crescent feature of the housing and the OD of the teeth of the inner gear (3) should then me measured at a point 37 mm from the corner of the crescent (1) feature, as shown below.
Acceptable tip clearance for inner gear.
^ 0.85 mm (0.033 inch) max

ASSEMBLY




1. Install new inner oil pump seal (1) with Seal Installer 8902-A.
2. Replace O-ring (2).





3. Lubricate pump gears and place in the pump housing. Insert pump gear (1) so that the chamfer (arrow) points towards the pump housing.