9.TROUBLESHOOTING
9-4
5. Check oil pressure switch function.
Oil pressure switch damaged. Replace oil pressure switch.
6. Check oil orifice(s) on the oil pump suction side.
Oil orifice(s) is (are) clogged. Clean from contamination. Replace oil and
oil filter if necessary (refer to maintenance or lubrication system).
7. Check oil pump function.
Oil pump rotor is out of wear limit. Replace oil pump (refer to lubrication
system).
Oil pump seized due to oil leakage and/or air inclusion. Replace oil pump
(refer to lubrication system).
Gears driving oil pump are broken or otherwise damaged. Replace gears.
Incorrect oil being used. Use recommended oil (refer to technical
specifications).
8. Check oil pressure regulator valve (spring) function.
Valve spring damaged (valve always open). Replace spring.
Valve piston is worn or broken. Replace valve piston (refer to lubrication
system).
Valve piston stays open due to contamination. Clean or repair valve
piston.
9. Check plain bearings in crankcase for heavy wear.
plain bearings out of specification (increased clearance). Replace plain
bearings (refer to bottom end).
10. Check engine oil strainer in crankcase.
Oil strainer is clogged due to contamination. Clean or replace strainer
and diagnose causes. Replace possible damaged parts (refer to bottom
end).
Symptom: OIL CONTAMINATION (white appearance)
1. Check leak indicator hole (in crankcase MAG side-water pump housing area) if
water and oil leaks.
Leakage of oil/water mixture from indicator bore means damaged water
pump seal ring and rotary seal. Replace sealing ring, rotary seal and
change oil, oil filter and/or coolant (refer to lubrication system, cooling
system and bottom end).
2. Check cylinder head and/or cylinder base gasket..
Gasket damaged or leaking. Retighten cylinder head with recommended
torque and/or replace gasket.
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