Oil Pump: Service and Repair
FRONT CASE, OIL PUMP AND SILENT SHAFTDISASSEMBLY AND REASSEMBLY
Disassembly Steps 1-36 Part 1:
Disassembly Steps 1-36 Part 2:
SERVICE POINTS OF DISASSEMBLY
4. REMOVAL OF OIL PRESSURE SWITCH
1. Remove the oil pressure switch terminals.
2. Using the special tool, remove the oil pressure switch.
CAUTION: Since sealant is coated on the tread area, be careful not to break it.
8. REMOVAL OF OIL PAN
1. Remove the oil pan bolts.
2. Drive in the special tool between the cylinder block and oil pan.
NOTE: Never use a screwdriver or chisel, instead of the special tool, as a deformed oil pan flange will result, resulting in oil leakage.
17. REMOVAL OF PLUG CAP
Using the special tool, remove the plug cap.
19. REMOVAL OF DRIVEN GEAR BOLT
1. Remove the plug on the side of cylinder block.
2. Insert a Phillips screwdriver (shank diameter 8 mm (.32 in.)) into the plug hold to block the silent shaft.
3. Remove the driven gear bolt that secures the oil pump driven gear to the silent shaft.
30. REMOVAL OF SILENT SHAFT FRONT BEARINGS
Using the special tool, remove the right silent shaft front bearing from the cylinder block.
NOTE: Be sure to remove the front bearing first. If it has not been removed, the Rear Bearing Puller cannot be used.
31. REMOVAL OF RIGHT SILENT SHAFT REAR BEARING
Using the special tool, remove the right silent shaft rear bearing from the cylinder block
32. REMOVAL OF LEFT SILENT SHAFT REAR BEARING
Using the special tool, remove the left silent shaft rear bearing from the cylinder block.
INSPECTION
FRONT CASE
Refer to P.11-50.
OIL SEAL
Refer to P.11-50.
OIL PRESSURE SWITCH
Refer to P.11-50.
OIL COOLER BYPASS VALVE (Turbo)
1. Make sure that the valve moves smoothly.
2. Ensure that the dimension L measures the standard value under normal temperature and humidity.
Dimension L: 34.5 mm (1.358 in.)
3. The dimension must be the standard value when measured after the valve has been dipped in 100 °C (212 °F) oil.
Dimension L: 40 mm (1.57 in.) or more
OIL PUMP
1. Assemble the oil pump gear to the front case and rotate it to ensure smooth rotation with no looseness.
2. Ensure that there is no ridge wear on the contact surface between the front case and the gear surface of the oil pump cover.
3. With the drive and driven gears installed into the front case.
Standard value:
Drive gear : 0.16-0.21 mm (0.0063-0.0083 in.)
Driven gear : 0.13-0.18 mm (0.0051-0.0071 in.)
Limit:
Drive gear : 0.25 mm (0.0098 in.)
Driven gear : 0.25 mm (0.0098 in.)
4. Check the side clearance.
Standard value:
Drive gear : 0.08-0.14 mm (0.0031-0.0055 in.)
Driven gear : 0.06-0.12 mm (0.0024- 0.0047 in.)
Limit:
Drive gear : 0.25 mm (0.0098 in.)
Driven gear : 0.25 mm (0.0098 in.)
SILENT SHAFT
1. Check oil holes for clogging.
2. Check journal for seizure, damage, and contact with bearing. If there is anything wrong with the journal, replace silent shaft, bearing or front case assembly.
3. Check the silent shaft oil clearance. If the clearance is excessively due to wear, replace the silent shaft bearing, silent shaft or front case assembly.
Standard value:
Front
Right : 0.020-0.061 mm (0.0008- 0.0024 in.)
Left : 0.050-0.091 mm (0.0002- 0.0036 in.)
Rear
Right : 0.020-0.054 mm (0.0008- 0.0021 in.)
Left : 0.042-0.083 mm (0.0017-0.0033 in.)
OIL JET, CHECK VALVE
1. Check the oil jet and check valve for clogging.
2. Check the oil jet for damage and deformation.
SERVICE POINTS OF REASSEMBLY
35. INSTALLATION OF OIL JET
When installing the oil jet, make sure that the nozzle is in correct direction, that is, toward the piston.
32. INSTALLATION OF LEFT SILENT SHAFT REAR BEARING
1. Install the special (GUIDE PLATE) tool to the cylinder block.
2. Apply engine oil to the rear bearing outer circumference and bearing hole in cylinder block.
3. Using the special tool, install the rear bearing.
NOTE: The left rear bearing has no oil holes.
31. INSTALLATION OF RIGHT SILENT SHAFT REAR BEARING
1. Apply engine oil to outer surface of bearing.
2. Using special tools, install right rear bearing. Make sure that oil hole of bearing is aligned with oil hole of cylinder block.
30. INSTALLATION OF SILENT SHAFT FRONT BEARINGS
1. Using special tools, install front bearing.
2. Make sure that oil hole of bearing is aligned with oil hole of cylinder block.
3. Furthermore, make sure that clinch of bearing is in upper most position.
27. INSTALLATION OF DRIVE GEAR /26. DRIVEN GEAR
Coat the gear with plenty of engine oil, and align the two timing marks.
24. INSTALLATION OF CRANKSHAFT FRONT OIL SEAL
Using the special tool, install the crankshaft front oil seal into front case.
23/22. INSTALLATION OF OIL SEAL
Using a socket wrench, press-in the oil seal into front case.
20. INSTALLATION OF FRONT CASE
1. Set the special tool on the front end of the crankshaft and apply a thin coat of engine oil to the outer circumference of the special tool to install the front case.
2. Install the front case assembly through a new front case gasket and temporarily tighten the flange bolts (other than those for tightening the filter bracket).
3. Mount the oil filter bracket with oil filter bracket gasket. Then, install the four bolts with washers.
4. Tighten the bolts to specification.
NOTE: Bolts indicated by the * symbol should be tightened at a torque of 27-34 Nm (20-25 ft.lbs.).
19. INSTALLATION OF DRIVEN GEAR BOLT
1. Insert a Phillips screwdriver into a hole in the left side of the cylinder block to lock the silent shaft.
2. Secure the oil pump driven gear onto the left silent shaft by tightening the driven gear bolt to specified torque.
17. INSTALLATION OF PLUG CAP
1. Install a new O-ring to the groove of front case.
2. Using the special tool, install the plug cap and tighten to specified torque.
8. INSTALLATION OF OIL PAN
1. Clean both mating surfaces of oil pan and cylinder block.
2. Apply a 4 mm (.16 in.) wide bead of sealant to the entire circumference of the oil pan flange.
Specified sealant: MITSUBISHI GENUINE PART No.MZIOO168 or equivalent
3. The oil pan should be installed in 15 minutes after the application of sealant.
4. Note the difference in bolt lengths at the location shown.
4. INSTALLATION OF OIL PRESSURE SWITCH
1. Coat sealant on the thread area, and using the special tool, install the pressure switch.
Specified sealant: 3M ART Part No.8660 or equivalent
CAUTION:
1. Do not let sealant ooze out of the top of the thread area.
2. Do not overtighten the pressure switch.
2. Install the oil pressure switch terminals.
3. INSTALLATION OF OIL FILTER
Wipe clean the mounting surface on the filter bracket. Then, apply a thin coat of engine oil to filter O-ring and tighten the oil filter by hand.
CAUTION: Never use a wrench to tighten the oil filter.