Quote:
Originally Posted by groovemasterodi
Damn, no tips y'all? 
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It'd help to know the service history, if you know anything about it -- otherwise we gotta assume the worst and the list gets long and nasty.
As far as cleaning sludge, I just carefully scrape off everything I can with a
plastic putty knife, or other soft scraper -- metal is a no-no! Have a shopvac with a very small diameter nozzle (I picked up a set of little nozzles for some dinky shopvac at Home Depot, and duct-taped to fit my larger unit) -- you want lots of suction in a small area. Take your time, and don't let chunks fall into the oil passages -- you don't want chunks clogging passages or getting into your oil pump pickup. Once you've got all the big stuff sucked up, wipe down everything you can reach with paint thinner or diesel fuel -- take your time, you don't want a bunch of thinner getting into your oil, unless you're planning on changing immediately. A old toothbrush makes a good scrubber. If the valve cover is sludged, soak it in thinner (overnight) and get it as cleaned up as possible. For a really, really bad case, you might have to replace the cover, but normally not. Let the thinner evaporate well (overnight, again, if possible) before putting the valve cover back on.
No matter how bad the sludge, do not run crap like motor flush or seafoam in your oil -- if you can't get in there and mechanically remove it, leave it be -- sludge is far better than a clogged oil pickup and a dead engine.