4.2.4. Diagnostics for oil
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Complaints Possible causes Corrections
Oil consumption (1) Poor oil (1) Use suggested oil
excessive (2) Oil seal or packing leaky (2) Replace cap
(3) Pistons or piston rings worn (3) Replace pistons and/or piston rings
(4) Cylinder liner worn (4) Replace cylinder liner
(5) Piston rings sticking (5) Replace pistons and/or piston rings
(6) Valve guide oil seals or valve (6) Replace
guides, or valve stem worn
Oil pressure (1) Poor oil (1) Use suggested oil
too low (2) Relief valve sticking (2) Replace
(3) Restrictions in oil pump strainer (3) Clean strainer
(4) Oil pump gear worn (4) Replace
(5) Oil pump feed pipe cracked (5) Replace
(6) Oil pump defective (6) Correct or replace
(7) Oil pressure gauge defective (7) Correct or replace
(8) Various bearings worn (8)Replace
Oil deteriorates (1) Restriction in oil filter (1) Replace filter element
quickly (2) Gases leaking (2) Replace piston rings and
cylinder liner
(3) Wrong oil used (3) Use suggested oil
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