6.3.4. Diagnostics and troubleshooting - 160 - MAINTENANCE OF MAJOR COMPONENTS Complaints Possible causes Corrections 1. Oil consumption excessive • Poor oil • Oil seal or packing leaky • Pistons or piston rings worn • Cylinder liner worn • Piston rings sticking • Valve guide oil seals or valve guides, or valve stem worn • Use suggested oil • Replace • Replace pistons and/or piston rings • Replace cylinder liner • Replace pistons and/or piston rings • Replace 2.
Oil pressure too low • Poor oil • Relief valve sticking • Restrictions in oil pump strainer • Oil pump gear worn • Oil pump feed pipe cracked • Oil pump defective • Oil pressure gauge defective • Various bearings worn • Use suggested oil • Replace • Clean strainer • Replace • Replace • Correct or replace • Correct or replace • Replace 3. Oil deteriorates quickly • Restriction in oil filter • Gases leaking • Wrong oil used • Replace filter element • Replace piston rings and cylinder liner • Use suggested oil