Oil Pump
Oil Pump
Oil Pump and Associated Parts
Disassembly
1. Remove crankshaft timing pulley.
2. Remove crankcase with oil pan.
3. Remove oil pipe.
4. Remove oil strainer.
5. Remove oil pump assembly.
6. Remove plug.
7. Remove spring.
8. Remove relief valve.
9. Remove oil pump cover.
10. Remove driven gear.
11. Remove drive gear.
12. Remove oil seal.
13. Remove O-ring.
Inspection and Repair
CAUTION: Make necessary correction or parts replacement if wear, damage or any other abnormal conditions are found during inspection.
Relief Valve
^ Check to see that the relief valve slides freely.
^ The oil pump must be replaced if the relief valve does not slide freely.
^ Replace the spring and/or the oil pump assembly (5) if the spring is damaged or badly worn.
Body and Gears
The pump assembly must be replaced if one or more of the conditions is discovered during inspection.
^ Badly worn or damaged driven gear (10).
^ Badly worn drive gear (11) driving face.
^ Badly scratched or scored body sliding face (14) or driven gear (10).
^ Badly worn or damaged gear teeth.
Measure the clearance between the body and the driven gear with a feeler gauge.
Standard: 0.10 mm - 0.18 mm (0.0039 inch - 0.0070 inch)
Limit: 0.20 mm (0.0079 inch)
^ Measure the clearance between the drive gear and driven gear with a feeler gauge.
Standard: 0.11 mm - 0.24 mm (0.0043 inch - 0.0094 inch)
Limit: 0.35 mm (0.0138 inch)
^ Measure the side clearance with a precision straight edge and a feeler gauge.
Clearance
Standard: 0.03 mm - 0.09 mm (0.0011 inch - 0.0035 inch)
Limit: 0.15 mm (0.0059 inch)
Oil Strainer
Check the oil strainer for cracking and scoring. If cracking and scoring are found, the oil strainer must be replaced.
Reassembly
1. Install drive gear (11).
2. Install driven gear (10).
3. Install oil pump cover (9) and first, loosely tighten all of the attaching screws. Next, tighten the attaching screws to the specified torque.
Torque: 10 Nm (7.4 ft. lbs.)
After installation, check that the gear rotates smoothly.
4. Install relief valve (8) and apply engine oil to the relief valve and spring (7).
5. Install spring (7).
6. Install the plug (6).
Torque: 8 Nm (5.9 ft. lbs.)
7. Install oil pump assembly (5).
^ Carefully remove any oil from the cylinder body and the pump. Apply sealant (TB-1207B or equivalent) to the pump fitting face as shown in illustration. Take care that sealant is not applied to oil port surfaces. The oil pump assembly must be installed within 5 minutes after sealant application to prevent premature hardening of sealant.
CAUTION: Do not apply an excessive amount of sealant to the contact surface. Applying too much sealant will overflow the contact surfaces. This could cause serious damage to the engine.
^ Attach oil pump assembly to cylinder body.
^ Tighten the oil pump fixing bolts.
Torque: 25 Nm (18.4 ft. lbs.)
8. Install the new oil seal (12). Apply engine oil to the oil seal lip before installation then use J-39202 oil seal Installer, install oil seal.
9. Install oil strainer (4) with O-ring (13).
Torque: 25 Nm (18.4 ft. lbs.)
10. Install oil pipe (3) with O-ring (13).
Torque: 10 Nm (7.4 ft. lbs.)
11. Install crankcase with oil pan (2).
^ Remove oil on crankcase mounting surface and dry the surface.
^ Apply a proper 4.5 mm (0.8 inch) wide bead of sealant (TB1207C or equivalent) to the crankcase mounting surface. The bead must be continuous.
^ The crankcase must be installed within 5 minutes after sealant application to prevent premature hardening of sealant.
^ Tighten fixing bolts to the specified torque.
Torque: 10 Nm (7.4 ft. lbs.)
12. Install crankshaft timing pulley.