Oil Pump: Service and Repair

REMOVAL
1. REMOVE ENGINE FROM VEHICLE
2. REMOVE TIMING CHAIN AND CRANKSHAFT TIMING SPROCKET





3. REMOVE CHAIN TENSIONER
Remove the bolt, chain tensioner plate and spring.





4. REMOVE OIL PUMP DRIVE CHAIN AND 2 SPROCKETS
a. Using a screwdriver, hold the oil pump drive shaft sprocket, as shown in the illustration.
b. Remove the nut, 2 sprockets and drive chain.





5. REMOVE OIL PUMP
Remove the 3 bolts, oil pump and gasket.

DISASSEMBLY





1. REMOVE OIL PUMP STRAINER
Remove the 2 nuts and strainer.
2. REMOVE RELIEF VALVE
Remove the plug, spring and relief valve.





3. REMOVE DRIVE AND DRIVEN ROTORS
Remove the 5 bolts, pump body cover, drive and driven rotors.

INSPECTION





1. INSPECT OIL JET
Check the oil jet for damage or clogging. If necessary, repair the oil jet.





2. INSPECT RELIEF VALVE
Coat the valve with engine oil and check that it falls smoothly into the valve hole by its own weight.
If it does not, replace the relief valve. If necessary, replace the oil pump assembly.





3. INSPECT ROTOR SIDE CLEARANCE
Using a feeler gauge and precision straight edge, measure the clearance between the rotors and precision straight edge.
Standard side clearance: 0.030 - 0.085 mm (0.0012 - 0.0033 inch)
Maximum side clearance: 0.16 mm (0.0063 inch)
If the side clearance is greater than maximum, replace the rotors as a set. If necessary, replace the oil pump assembly.





4. INSPECT ROTOR TIP CLEARANCE
Using a feeler gauge, measure the clearance between the drive and driven rotor tips.
Standard tip clearance: 0.080 - 0.160 mm (0.0031 - 0.0063 inch)
Maximum tip clearance: 0.35 mm (0.0138 inch)
If the tip clearance is greater than maximum, replace the rotors as a set.





5. INSPECT ROTOR BODY CLEARANCE
Using a feeler gauge, measure the clearance between the driven rotor and body.
Standard body clearance: 0.100 - 0.170 mm (0.00394 - 0.00669 inch)
Maximum body clearance: 0.325 mm (0.01280 inch)
If the body clearance is greater than maximum, replace the rotors as a set. If necessary, replace the oil pump assembly.
6. INSPECT OIL PUMP DRIVE CHAIN AND 2 OIL PUMP SPROCKETS





a. Using a vernier calipers, measure the length of 8 links with the chain dully stretched.
Maximum chain elongation: 52.4 mm (2.063 inch)
If the elongation is greater than maximum, replace the chain.

HINT: Make the same measurements pulling at 3 or more places selected at random.

b. Wrap the chain around the oil pump sprocket.





c. Using a vernier calipers, measure the timing sprocket diameter with the chain.

NOTICE: Vernier calipers must contact the chain rollers for measuring

Minimum sprocket diameter (w/ chain):
Crankshaft 48.2 mm(1.898 inch)
Oil Pump Drive Shaft 48.2 mm (1.898 inch)
If the diameter is less than minimum, replace the chain and sprockets.





7. INSPECT CHAIN TENSIONER PLATE
Measure the chain tensioner plate wear.
Maximum wear: 0.5 mm(O.020 inch)
If the wear is greater than maximum, replace the chain tensioner plate.

REASSEMBLY





1. INSTALL DRIVE AND DRIVEN ROTORS
a. Place the drive and driven rotors into pump body with the marks facing the pump body cover side.
b. Install the pump body cover with the 5 bolts.
Torque: 8.8 Nm (90 kgf-cm, 78 inch lbs.)
2. INSTALL RELIEF VALVE
Insert the relief valve and spring into the pump body hole, and install the plug.
Torque: 49 Nm (500 kgf-cm, 36 ft. lbs.)
3. INSTALL OIL PUMP STRAINER
Insert the strainer with the 2 nuts.
Torque: 8.8 Nm (90 kgf-cm, 78 inch lbs.)

INSTALLATION





1. INSTALL OIL PUMP
a. Place a new gasket on the cylinder block.
b. Install the oil pump with the 3 bolts.
Torque: 18.6 Nm (190 kgf-cm, 14 ft. lbs.)
2. INSTALL DRIVE CHAIN AND 2 SPROCKETS





a. Set the chain on the 2 sprockets, as shown in the illustration.

HINT:
- Set the mark on the oil pump drive sprocket at the colored link in the chain.
- Set the mark on the oil pump drive shaft sprocket at the colored link.





b. Set the crankshaft key into the left horizontal position and turn the cutout of the drive shaft to the top.
c. Install the chain and 2 sprockets with the nut.
Torque: 29.5 Nm(300 kgf-cm, 22 ft. lbs.)





3. INSTALL CHAIN TENSIONER
Install the spring and plate with the bolt.
Torque: 12 Nm (122 kgf-cm, 9 ft. lbs.)
4. INSTALL CRANKSHAFT TIMING SPROCKET AND TIMING CHAIN
5. INSTALL ENGINE TO VEHICLE
6. START ENGINE AND CHECK FOR LEAKS
7. RECHECK ENGINE OIL LEVEL