Re: 2nd engine failure - Saab 9000 Bulletin Board - Saabnet.com
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Re: 2nd engine failure
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Posted by sam96CS [Email] (#852) [Profile/Gallery] (more from sam96CS) on Wed, 7 Aug 2013 10:51:42 Share Post by Email
In Reply to: 2nd engine failure, Ironjoe2, Wed, 7 Aug 2013 08:19:56
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According to the Haynes Manual, "An oil cooler is fitted to turbo models only. It is connected to ports on an adapter fitted to the oil filter, and the adapter also incorporates an oil thermostat"

If you do a Google search for "B234 lubrication" you'll find a post that says, "It's pretty straight forward really. The oil pickup feeds into the oil pump which then flows to the oil filter housing. It then passes through the oil filter and if on its way out if the oil temperature is high enough the oil thermostat opens and allows oil to flow to the oil cooler and back into the motor. Otherwise it skips the oil cooler entirely and flows straight into all the oil galleys and the turbo oil supply line (also at the oil filter housing). As for flow back into the sump its as its been said. It just finds it's way back down from the top of the head via the timing chain area, the oil return tube, being scraped down by the piston rings off the wall, or dripping off of the pistons from the oil squirters. The only time any oil runs a different route is as the pressure reaches 50psi the oil relief valve opens and allows oil to run off to the sump. It's located down at the base of the block by the oil filter housing. I don't know whether it opens a port off of the oil pump housing or oil filter housing though."

My take from the above and from the relatively low price of a new oil cooler is that the oil cooler is a passive device that does not restrict the flow of oil.

If the oil cooler or one of the lines running to and from it is clogged, then the oil isn't cooled. If the oil thermostat fails to open when the oil is hot, then the oil isn't cooled. In either of these conditions, what is lost is oil cooling but not oil circulation through the engine. One of the primary tasks of motor oil is helping keep the engine cooled.

I don't know what motor oil would look or smell like if it is overheated, or what would happen to the oil's viscosity. You may have valuable clues sitting in your sump. You're right to look for the root of the problem before putting in #3. For extra insurance and peace of mind you might also add gauges showing oil pressure and oil temperature.


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