Operation CHARM: Car repair manuals for everyone.
Hosted by mcallihan.com
Home >> Toyota >> 1988 >> MR2 L4-1587cc 1.6L DOHC SC (4A-GZE) >> Repair and Diagnosis >> Transmission and Drivetrain >> Automatic Transmission/Transaxle >> Service and Repair >> Diassembly and Assembly >> Unit Overhaul >> Oil Pump >> Disassembly and Assembly

Disassembly and Assembly




COMPONENTS

DISASSEMBLY OF OIL PUMP




1. REMOVE RACE FROM STATOR SHAFT
2. REMOVE 0-RING FROM PUMP BODY




3. REMOVE TWO OIL SEAL RINGS FROM BACK OF STATOR SHAFT
4. REMOVE THRUST WASHER OF CLUTCH DRUM FROM STATOR SHAFT




5. REMOVE STATOR SHAFT
Remove the eleven bolts and the stator shaft.
Identify the top and bottom.
Keep gears in assembly order.

INSPECTION OF OIL PUMP




1. CHECK BODY CLEARANCE OF DRIVEN GEAR
Push the driven gear to one side of the body.
Using a feeler gauge, measure the clearance.

Standard body clearance: 0.07 - 0.15 mm (0.0028 - 0.0059 in.)

Maximum body clearance: 0.3 mm (0.012 in.)

If the body clearance is greater than the maximum, replace the drive gear, driven gear or pump body.




2. CHECK TIP CLEARANCE OF BOTH GEARS
Measure between the gear teeth and the crescent-shaped part of the pump body.

Standard tip clearance: 0.11 - 0.14 mm (0.0043 - 0.0055 in.)

Maximum tip clearance: 0.3 mm (0.012 in.)

If the tip clearance is greater than the maximum, replace the drive gear, driven gear or pump body.




3. CHECK SIDE CLEARANCE OF BOTH GEARS
Using a steel straightedge and a feeler gauge, measure the side clearance of both gears.

Standard side clearance: 0.02 - 0.05 mm (0.0008 - 0.0020 in.)

Maximum side clearance: 0.1 mm (0.004 in.)

If the side clearance is greater than the maximum, replace the drive gear, driven gear or pump body.




4. INSPECT FRONT OIL SEAL
Check for wear, damage or cracks.

5. IF NECESSARY, REPLACE FRONT OIL SEAL
a. Pry off the oil seal with a screwdriver.
b. Using SST and a hammer, install a new oil seal. The seal end should be flush with the outer edge of the pump body.
SST 09350-32013 (09351-32140)

ASSEMBLY OF OIL PUMP




1. INSTALL DRIVEN GEAR AND DRIVE GEAR
Make sure the top of the gears are facing upward.




2. INSTALL STATOR SHAFT ONTO PUMP BODY
Align the stator shaft with each bolt hole.

3. TIGHTEN ELEVEN BOLTS

Torque: 100 kg.cm. (7 ft.lb., 10 N.m)




4. INSTALL THRUST WASHER
a. Coat the thrust washer with petroleum jelly.
b. Align the tab of the washer with the hollow of the pump body.




5. INSTALL THE TWO OIL SEAL RINGS ON OIL PUMP

CAUTION: Do not spread the ring ends too much.

NOTE: After installing the oil seal rings, check that they move smoothly.




6. CHECK PUMP DRIVE GEAR ROTATION
Turn the drive gear with two screwdrivers and make sure that it rotates smoothly.

7. INSTALL NEW 0-RING
8. INSTALL RACE ONTO STATOR SHAFT
pro multis · About Operation CHARM