Fluid Pump: Service and Repair

OIL PUMP





Disassembly




1. Remove oil pump cover




2. Remove return spring taking care not to damage converter housing.



Inspection




1. Inspect oil pump cover, cam ring. rotor and vanes for damage and visible wear
2. Measure clearance between clutch housing and cam ring. rotor and vanes in at least four places along their circumstances. The maximum measured value should be within the specified range.

Note: Be sure to remove friction ring and vane ring when measuring clearance.

Standard clearance:
Cam ring to oil pump cover 0.010 - 0.024 mm (0.0004 - 0.0009 in)
Rotor to oil pump cover 0.017 - 0.031 mm (0.0007 - 0.0012 in)
Vane to oil pump cover 0.017 - 0.031 mm (0.0007 - 0.0012 In)
Wear limit:
0.034 mm (0.0013 in)

If the clearance is out of above specification. replace oil pump as an assembly.




3. Measure clearance between seal ring and ring groove.
Standard clearance:
0.10 - 0.25 mm (0.0039 - 0.0098 in)
Wear limit:
0.25 mm (0.0098 in)



Assembly




1. Install cam ring, 0-ring and friction ring




2. Install return spring and spring retainer




3. Assemble rotor, vanes. rotor support ring and vane rings. Pay attention to direction of rotor.




4. Install oil pump cover.
- Tighten down cover evenly in a criss-cross type pattern.




5. Rotate the pump when it has been assembled to ensure that all parts have been correctly assembled.
6. Install seal rings.




Note: These seal rings can be cut or deformed if they are improperly seated in their grooves when the drum is installed. Clean the ring grooves carefully and fill them with petroleum jelly. Then install the rings making sure they fit into the grooves as tightly as possible.