Re: Losing oil (puzzled)

From: TREMAIN LYNNE (bmbl-b1@home.com)
Date: Tue Nov 23 1999 - 20:12:15 EST


Bob
You probably already checked it, but if not check your pcv valve. Stuck
open it will draw oil through the pcv into the intake (especially if you
have after market valve covers), stuck closed it can build up pressure
in the crankcase and force oil past the rings on the intake stroke.
Hopefully the solution is that simple

Dave T.
99 solar Yellow CC 4x4

Bob Tom wrote:
>
> Hi, everybody.
>
> Situation:
> '97 Magnum 318 ... been losing oil lately ... no visible external leaks
> ... no really tell-tale signs from the exhaust pipe (after sitting overnight,
> on startup, will blow out a bit of soot and lots of moisture vapour ...
> running headers) ... running a 180F tstat ... no loss in coolant ... low
> mileage
> ... weekend drag racing this season ... running 5W30 synthetic ... am
> running rich
> and switching back to stock tstat in this colder weather. I did a
> compression test
> and cyclinder 4 is off ... FSM says crank over 3 times and compression
> pressure should
> be 100 psi. Most of the loss comes after fairly brisk highway driving.
>
> Results are (bracketed are plug condition):
>
> 1 152 (wet: oil) 2 150 (dry: aok)
> 3 150 (wet: oil) 4 130 (dry: aok)
> 5 150 (black) 6 145 (wet then dried out: gas)
> 7 145 (dry: aok) 8 150 (wet: oil)
>
> I'm running the MP Magnum R/T cam which may account for the high numbers.
> Also, ran compressed air through cylinder 4 and listened through a rubber
> hose ... did not detect sound of leakage. Also, put oil in cyclinder 4 and
> did a compression re-read. Removed rad during compression testing and
> no bubbles in the rad coolant.
>
> This leads me to conclude that rings are aok and maybe valve seals (or some
> other valvetrain components) are the problem but I'm puzzled about cyclinder 4
> compression reading. Any ideas at all? Thanks very much.
>
> Bob. Southern Ontario, Canada.
> '97 Dakota CC Sport, FR, 5.2L, 3.55 SG, auto.



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