Oil Pump: Service and Repair

Disassembly and Assembly

LU-13 Exploded View:

DISASSEMBLY
1. Remove oil pan (lower) and oil strainer.
3. Remove front timing chain case and timing chain (primary).
4. Remove oil pump assembly.
5. Remove oil pump cover.
6. Remove oil pump inner rotor and oil pump outer rotor from oil pump body.
7. After removing regulator valve plug, remove regulator valve spring and regulator valve.

ASSEMBLY
Note the following, and assemble in the reverse order of disassembly.

CAUTION:
Before assembly, apply new engine oil to the parts as instructed in the figure.





^ Install oil pump inner rotor with the groove faced to oil pump cover side.
A: Oil pump body side
B: Oil pump cover side
C: Groove
^ When installing oil pump, align crankshaft flat faces with oil pump inner rotor flat faces.

Inspection

INSPECTION AFTER DISASSEMBLY

Oil Pump Clearance





^ Measure the clearance with feeler gauge (C).
^ Clearance between oil pump outer rotor and oil pump body [position (B)]
Standard: Refer to LU-16, "Oil Pump". Oil Pump
^ Tip clearance between oil pump inner rotor and oil pump outer rotor [position (A)]
Standard: Refer to LU-16, "Oil Pump". Oil Pump





^ Measure the clearance with feeler gauge and straightedge (A).
^ Side clearance between oil pump inner rotor and oil pump body [position (C)]
Standard: Refer to LU-16, "Oil Pump". Oil Pump
^ Side clearance between oil pump outer rotor and oil pump body [position (B)]
Standard: Refer to LU-16, "Oil Pump". Oil Pump
^ Calculate the clearance between oil pump inner rotor and oil pump body as follows:

OIL PUMP BODY INNER DIAMETER





^ Measure the inner diameter of oil pump body with inside micrometer. [position (A)]

OIL PUMP INNER ROTOR OUTER DIAMETER
^ Measure the outer diameter of protruded portion of oil pump inner rotor (1) with micrometer. [position (B)]

OIL PUMP INNER ROTOR TO OIL PUMP BODY CLEARANCE
^ (Clearance) = (Oil pump body inner diameter) - (Oil pump inner rotor outer diameter)
Standard: Refer to LU-16, "Oil Pump". Oil Pump
^ If measured/calculated values are out of the standard, replace oil pump assembly.

Regulator Valve Clearance





(Clearance) = (Regulator valve hole diameter) - (Regulator valve outer diameter)
1: Regulator valve
2: Oil pump body
Standard: Refer to LU-16, "Regulator Valve". Regulator Valve
^ If the calculated value is out of the standard, replace oil pump assembly.

CAUTION:
^ Coat regulator valve with engine oil.
^ Check that it falls smoothly into valve hole by its own weight.

INSPECTION AFTER INSTALLATION
1. Check the engine oil level. Refer to LU-6, "Inspection". Testing and Inspection
2. Start the engine, and check there is no leakage of engine oil.
3. Stop the engine and wait for 10 minutes.
4. Check the engine oil level and adjust the level. Refer to LU-6, "Inspection". Testing and Inspection