Probably should have laid grease around all pistons. - Saab 900 Bulletin Board - Saabnet.com
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Probably should have laid grease around all pistons.
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Posted by RayF (more from RayF) on Mon, 1 Oct 2007 09:50:51 Share Post by Email
In Reply to: I am a bit concerned with what you are saying..., Chaz, Mon, 1 Oct 2007 06:53:34
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Not just the two down in their bores - - crap can get in between the other two pistons and the cylinder wall, down as far as the top ring.
If you have compresed air available I'd blow those two out.
Getting abrasive matter into the engine internals isn't good practise, but I wouldn't worry too much about what you've done.
The vast part of what came off the head and the Roloc pads flew or blew away, and much of it wouldn't be very harmful anyway. And the oil filter is there for a reason and would indeed catch most anything else, before pumping oil from sump around to the bearings. Sure maybe some ultrafine particles get through but there wouldn't be many and they can't do much to worry about.
I once rebuilt air-cooled VW motors and those things were invariably an oily sandy mess. Only oil filter on them was a piece of window screen.
It wasn't uncommon to pull bearings and find fine parallel scoring, from where sand had gotten inside and pumped around in the oil.
But that wasn't their reason for being in sick bay and those bearings were usually tight and working fine, they only had an unengineered extra oil groove (ultrafine and not drawing pressure) down the middle of a large expanse of bearing metal.
Don't put sand in your motor intentionally.
Change your oil and filter promptly, and I'm sure everything will be all right.


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