Section 03
ENGINE
Subsection 02
(TROUBLESHOOTING)
03-02-4
VMR2004_125_03_02A.FM
LUBRICATION
SYMPTOM
LOW OR NO OIL PRESSURE/HIGH OIL CONSUMPTION.
CONDITION
NORMAL USE.
Test/Inspection
1. Check oil level and search for leakage on crankcase and/or defective seals.
a. Crankcase is leaking due to damage.
Rebuild engine with new crankcase and gasket parts. Use a high quality oil
(refer to TECHNICAL DATA).
b. Crankcase is leaking due to loose screws.
Retighten screws with recommended torque.
c. Sealing rings, O-rings and/or gaskets are brittle and/or hard or damaged.
Replace damaged parts.
d. Piston rings worn out (blue-colored engine exhaust emission).
Replace piston rings (refer to CYLINDER AND HEAD).
e. Piston rings are broken (low compression and blue-colored engine exhaust emission).
Replace piston rings (refer to CYLINDER AND HEAD).
f. Valve stem seal damaged and/or sealing lip is hard and/or brittle.
Replace all valve stem seals.
2. Check oil filter for contamination.
a. Oil filter clogged.
Replace oil filter and oil at the same time. Use a high quality oil
(refer to TECHNICAL DATA).
3. Check oil pressure regulator valve (spring) function.
a. Valve spring damaged (valve always open).
Replace spring.
b. Valve stays open in crankcase PTO due to contamination (metallic particles).
Clean and/or repair valve piston.
4. Check oil drain plug on engine bottom.
a. Plug is loosed and/or gasket ring is missing.
Retighten the plug and/or place gasket ring.
5. Check oil strainer on engine bottom.
a. Screw(s) is (are) loosed and/or gasket is damaged, brittle or hard.
Retighten screw and/or replace gasket.
b. Oil strainer is clogged due to contamination.
Clean or replace strainer and diagnose causes. Replace possible damaged parts.
Use high quality oil (refer to TECHNICAL DATA).
6. Check leak indicator hole for oil leaks (water pump housing area MAG side).
a. Oil leaking from leak indicator hole means a damaged oil seal inside magneto cover
on water pump shaft.
Replace both rotary seal and oil seal
(refer to COOLING SYSTEM and MAGNETO SYSTEM).
7. Check oil pressure switch function.
a. Oil pressure switch damaged.
Replace oil pressure switch.