[DeTomaso] oil-burning question

[John Taphorn]

Jack states, "> Consider: the only two ways oil can get into the combustion 
chambers "

Two additional ways that oil can get into the combustion chamber

1) PCV Valve
2) compromised intake gasket.

Both are quite common sources.
----- Original Message ----- 
From: <JDeRyke at aol.com>
To: <chrisvkimball at msn.com>; <detomaso at realbig.com>
Sent: Monday, January 07, 2008 11:30 AM
Subject: Re: [DeTomaso] oil-burning question


> In a message dated 1/6/08 5:11:52 PM, chrisvkimball at msn.com writes:
>
>> Any ideas as to why I saw the blue stuff upon startup, and from only the
>> driver's side pipes?
>>
>>
> Consider: the only two ways oil can get into the combustion chambers is to
> either bypass the rings from below or leak past the valve guide seals at 
> the
> top. A cracked ring can act this way and a leak-down test will show the 
> bad ring.
>
> Since stock and 'overhaul' valve guide seals are not really seals but
> oil-deflectors, oil that pools in a rocker cover has more opportunity to 
> seep past
> ineffective seals. It may also be that the skimpy stock oil drainbacks in 
> the
> head on the side where startup smoke is seen, are plugged or partially 
> blocked
> causing the pooling to be deeper and last longer. The seals. made of 
> neoprene
> rubber, also harden and turn brittle after a decade or so soaking in hot 
> oil.
> Such seals then crack and the pieces fall into the oil pan to cause more
> trouble. Both drainback-blockages and disintegrating seals are quite 
> common on
> Cleveland engines. Both drains in the head can be cheaply cleared without 
> removing
> the heads from the engine, by the way- if it turns out this was the cause.
> First start the engine and let it run for only a minute or two. Then pull 
> the
> spark plugs on the smoking side to determine which cylinder is causing the
> problem. Oil in a chamber will leave oily black debris on a plug, if you 
> catch
> it before engine heat burns the evidence away. Once located, you can
> concentrate efforts on that chamber. Pulling the driver's side rocker 
> cover after
> running for a minute will quickly show if oil is not draining back 
> properly- excess
> oil will   come out in a cascade all over everythjing! A disintegrated 
> seal is
> difficult to see on an assembled head but often, bits of a bad seal are 
> still
> up in the rocker chamber. Good luck- J Deryke
>
>
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