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95 Transport engine knock - Oil pump or worse?
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Tomtina3
New User
Feb 14, 2008, 3:51 PM
Post #1 of 2
(1315 views)
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95 Transport engine knock - Oil pump or worse?
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1995 Pontiac Transport 3.8L, 195k mi., Oil pressure gauge reads normal when cold, goes down to almost zero as it warms up. Engine runs smooth when cold, but knocks like hell when it heats up, especially under torque. Leaks oil dripping fairly fast when cold (but not once it warms up) around the crankshaft. so.... mechanic thinks the engine is shot, thinks oil is leaking internally, engine bearings etc, and thats why the oil pressure is low. Could it be the oil pump? rebuild is about $250, pump is internal (in engine, not in the oil pan). How can you test whether its the oil pump, or if the engine is shot? i hate to put another $2-300 if its not the problem, and mechanic is skeptical. Any advice?
Also, would a thicker oil buy me some time? What viscosity?? Thanks!
(This post was edited by Tomtina3 on Feb 14, 2008, 3:51 PM)
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Feb 15, 2008, 7:11 AM
Post #2 of 2
(1304 views)
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Re: 95 Transport engine knock - Oil pump or worse?
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With the description given it sounds like this engine is shot. A new high output oil pump might help but if you have noticed this and driven this with the noise the damage to bearings is done. The leak could be the rear main not beieng able to keep up with the crank out of spec now and could behave when it warms up or that internal bearing leak so much there isn't enough to leak there.
Hard to condem it without really being there but I think you could limp this along a while with like the super thick STP type things/additive which thickens the oil. If cold where you are it can be too much to start up first time of the day though,
T
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