Date: 14 Sep 2001 04:42:09 GMT
From: johnra1975nopsamcom (johnra1975)
Subject: Re: Suggestions re. overheated engine


Glenn, two engines aren't quite enough to suggest a statistical trend! While there is a non-zero probability that both the head and block are warped, I'd place my wager on it merely being a head gasket and possibly a warped head. The coefficient of expansion for aluminum [around 2.64E-05 per degree Kelvin near 500K] is greater than iron [Somewhere around 1.2E-05]. Due to this, the temperature gradient between the hot and cold side of the head, and the nonuniform force of the head against the gasket [the bolts are spaced a few inches apart], the head is more likely to warp beyond acceptable limits before the block. So the short version is, pull off the head and check it out before spending the money on a replacement. Hope this helps... John Rausch 86 900S 87 900S 88 900 SPG 92 900TC Direct personal correspondence to: johnranopsampot.phys.uwosh.edu >Subject: Re: Suggestions re. overheated engine >From: "Glenn D Paulin" splitscreen69nopsamond.com >Date: 9/11/2001 7:07 AM Central Daylight Time >Message-id: <0Y_n7.10865$c5.96831nopsamfeeds.bigpond.com> > >Have seen two engines, one form 900s one from 9000, that were badly >overheated. Both were write-offs. Better to get another engine. Glenn "Robin Moore" <robin.moorenopsamatico.ca> wrote in message news:3B9EABD7.27BDE918nopsamatico.ca... > Last week the water pump on my 92 900 (normally aspirated) blew and the > engine overheated. It happened on the highway and we stopped quickly, > but it appears that the head gasket blew and the head is likely warped. > > My mechanic says that it is unlikely that the engine / head can be saved > and recommends a replacement engine. >

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