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Re: filth around plugs...
I, too, have noticed this sludge buildup (87 5kt)... The weird thing is, all the
explanations sound plausible. Certainly the stem-seals theory should result in
an improved condition... but if the seals are that bad, would there be
noticeable oil consumption? My engine at 192k has exhibited the sludge since I
have owned the car (70k miles worth)- but in that time, I have yet to need to
add a *drop* between changes- no smoke either- hence, I can't see replacing the
seals only for the sludge problem.
Am I far wrong here?
> In a message dated 99-03-05 11:01:28 EST, you write:
> << My $0.02. Don't think petrol would yield this filth. It evaporates
> to readily. My $0.02 is on oil creeping past the threads/sealing gasket
> and bad valve stem seals as the predominant source of the oil.
> Mark Pollan, '86 5KCSTQ 280K Miles:)
> I'll go with Mark's analysis. On my 200tq with 160k miles I couldn't keep
> that area clean. Within 1 week after washing the engine that oil filth was
> back. When I renewed the cylinder head I replaced the valve guides and stem
> seals. Now that area stays dry and clean. Also the spark plugs themselves
> remain much whiter much longer. The old stem seals were definitely toast.
> The sludge is partially cooked oil with some petrol residue, and the grit is
> normally thrown up while driving. It just has something tacky to cling to
> here. Without the oil filth the few grits that accumulate in this pocket
> remain dry and are easily blown out prior to removing the plugs. IMHO.
> Jim Accordino