Section 03
ENGINE
Subsection 02
(TROUBLESHOOTING)
VMR2004_125_03_02A.FM
03-02-5
Test/Inspection
8. Check oil orifice(s) on the oil pump suction side.
a. Oil orifice(s) is (are) clogged.
Clean from contamination. Replace oil and oil filter if necessary
(refer to MAINTENANCE or LUBRICATION).
9. Check oil pump operation.
a. Oil pump rotor is out of wear limit.
Replace oil pump shaft (refer to LUBRICATION).
b. Oil pump seized due to oil leakage and/or air inclusion.
Replace oil pump (refer to LUBRICATION).
c. Gears driving oil pump are broken or damaged.
Replace gears.
d. Incorrect oil being used.
Use a high quality oil (refer to TECHNICAL DATA).
10. Check plain bearings in crankcase for heavy wear.
a. Plain bearings out of specification (increased clearance).
Replace all plain bearings at the same time (refer to CRANKSHAFT).
SYMPTOM
OIL CONTAMINATION (WHITE APPEARANCE).
CONDITION
NORMAL USE.
Test/Inspection
1. Check leak indicator hole (water pump housing area MAG side) if water and oil
leaks.
a. Leakage of oil/water mixture from leak indicator hole means damaged oil seal and
rotary seal inside magneto cover on water pump shaft.
Replace both rotary seal and oil seal and refill with recommended oil and/or coolant
(refer to COOLING SYSTEM and MAGNETO SYSTEM).
2. Check cylinder head and/or cylinder base gasket.
a. Gasket damaged or leaking.
Retighten cylinder head with recommended torque and/or replace gasket.
3. Check screws for torque.
a. Screws not fixed.
Retighten screws with recommended torque and/or replace oil.
4. Check oil for particles (may indicate possible damages inside the engine).
a. Oil contamination due to metal or plastic particles.
Replace possibly damaged parts. Use a high quality oil (refer to TECHNICAL DATA).
SYMPTOM
LOW OR NO OIL PRESSURE/HIGH OIL CONSUMPTION.
CONDITION
NORMAL USE.