Honda Metropolitan CHF50 Service Manual page 79

LUBRICATION SYSTEM
SERVICE INFORMATION
GENERAL
ACAUTION
Used engine oil may cause skin cancer if repeatedly left in contact with the skin for prolonged periods. Although this is
unlikely unless you handle used oil on a daily basis, it is still advisable to thoroughly wash your hands with soap and
water as soon as possible after handling used oil.
The oil pump can be serviced with the engine installed in the frame.
The service procedures in this section must be performed with the engine oil drained.
When removing and installing the oil pump, use care not to allow dust or dirt to enter the engine.
If any portion of the oil pump is worn beyond the specified service limits, replace the oil pump as an assembly.
After the oil pump has been installed, check that there are no oil leaks.
SPECIFICATIONS
Unit: mm (in)
ITEM
Engine oil capacity At draining
At disassembly
Recommended engine oil
Oil pump rotor Tip clearance
Body clearance
Side clearance
STANDARD
0.6 liter (0.6 US qt, 0.5 Imp qt)
0.7 liter (0.7 US qt, 0.6 Imp qt)
Pro Honda GN4 or HP4 (Without
molybdenum additives) 4-stroke oil or
equivalent motor oil
API service classification: SG or Higher
Viscosity: SAE 10W-40
0.15 (0.006)
0.15-0.20(0.006-0.008)
0.05-0.10(0.002-0.004)
SERVICE LIMIT
-
-
0.20 (0.008)
0.22 (0.009)
0.12(0.005)
TORQUE VALUES
Engine oil strainer cap
Engine oil pump cover screw
20 N-m (2.0 kgf-m, 14 Ibf-ft)
2.0 N-m (0.2 kgf-m, 1.4 I bf-ft)
TROUBLESHOOTING
Engine oil level too low
Oil consumption
External oil leak
Worn piston ring or incorrect piston ring installation
Worn cylinder
Worn valve guide or seal
Oil contamination
Oil not changed often enough
Faulty cylinder head gasket
Worn piston ring
4-3