Garrett Bearing troubleshooting guide

Normal Use

Acceptable operating & maintenance procedures

Contaminated oil (dirt in oil)

Engine oil and oil filter(s) not changed frequently enough, unfiltered air entering engine intake, malfunction in prelube valve or oil filter bypass valve

Severely contaminated (dirty oil)

Pounded by eccentric shaft motion

Foreign object damage, coked or loose housing, excessive bearing clearing due to lube problem

Center housing bearing bores, rough finish

Incorrect cleaning of ctr. hsg. during overhaul of turbo. (Wrong chemicals, bores sand or bead blasted)

Metal or large particle oil contamination

Severe engine wear. i.e., Bearing damage, camshaft or lifter wear, broken piston

Lack of lube, oil lag, insufficient lube

Low oil level, high speed shutdowns, lube system failure, turbo plugged w/ R.T.V.

Coking

Hot shutdowns, engine overfueled, restricted or leaking air intake

Fine particles in oil (contaminated oil)

See contaminated oil

Rough bearing journals on shaft

Bearing journals not protected from sand or bead blast cleaning during overhaul