No oil pressure when engine is hot

cope777 · 06-21-2008, 06:31 PM

I have an 02 Sedona that when the engine warms up has zero (0) oil pressure. I put in a mechanical guage, so I am sure there is no pressure. Also, as expected, there is a lot of valvetrain noise with 0 pressure. I noticed smoke and a burning oil smell from the fron exhaust manifold, but couldn't see a leak. I changed the oil, put in some Lucas oil conditioner, and changed the filter with no results (that was a month ago,and the van has been sitting since. We don't drive it.)

Any ideas as to what to look at next? Thanks.

Alarmin · 06-22-2008, 05:30 AM

Good idea not to drive it.

Are you getting good pressure on a cold start?

Could be the oil pump failed or strainer blocked.

Time to change the oil pump & give the whole engine a flush out.

Just hope that no serious damage has been caused already.

Classic boy · 06-23-2008, 05:09 AM

You may have spun a bearing it will most likely require full engine disassembly to confirm the fault.

TEXKIATECH · 06-27-2008, 09:41 PM

Quote:

Originally Posted by Classic boy

You may have spun a bearing it will most likely require full engine disassembly to confirm the fault.

what does spinning a bearing have to do with no oil pressure. alarming is right take off your oil pan to check to see if the pick up is clogged. if it s unbolt it clean it and put back on. but if its the oil pump its alot more work and i reall dont feel like typing it out. but i would try either a an engine flush kit or pick up first

ron1004 · 06-28-2008, 03:22 AM

Quote:

Originally Posted by TEXKIATECH

what does spinning a bearing have to do with no oil pressure. alarming is right take off your oil pan to check to see if the pick up is clogged. if it s unbolt it clean it and put back on. but if its the oil pump its alot more work and i reall dont feel like typing it out. but i would try either a an engine flush kit or pick up first

Your approach to investigating the problem is good.

The excessive clearance when a white metal bearing is gone could cause the loss of oil pressure - when the engines hot and oil viscosity lower there may be insufficient back pressure due to bearing problems.