Volvo AWD 850 Forum

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Gasket needed or just o-ring where oil cooler meets pan? 850

posted by  rocketman4321 on  Mon Jul 7 09:41 CST 2008
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last visit: Sun Jul 6 10:32 CST 2014
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I replaced the rectangular o-ring where my oil cooler return/thermostat (?) meet the oil pan. I'm sure things are seated, but it still leaks like crazy. (At least I think it's this leaking--decent puddle in 15 sec.) Screws are down nice and firmly. Lines are clamped all the way in. Should I have added the sealant like I used on the pan-to-block?








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Gasket needed or just o-ring where oil cooler meets pan? 850

posted by  someone claiming to be bob on  Mon Jul 7 10:45 CST 2008 [RELATED]

Just an o ring.It's easy to pinch the o ring during install







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Agree, but I've done this 3 times now.... 850

posted by  rocketman4321 on  Mon Jul 7 12:07 CST 2008
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...each with the same sort of leak. I"m sure the o-ring is seated, and held by the little bumps in the groove. I'm getting a pretty good size puddle in 10-15 sec, so it must be under pressure, right? I don't think the oil pan/block seal could do that.

Maybe I'll try reusing the old o-ring.








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Agree, but I've done this 3 times now.... 850

posted by  volvosfive on  Tue Jul 8 06:52 CST 2008
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last visit: Sun Aug 21 08:01 CST 2011
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Are you sure that the leak isn't coming from the two oil cooler lines that go into the thermostat? They have O rings too. Mine started leaking when I had the pan off to replace the O rings that were causing lifter noise. I got the two oil cooler line O rings and that stopped the leak.






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