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89 240 loud banging noise near rear of engine when running 200

uid 25912's pic
posted by  Sven's Maintainer on  Sat Aug 20 15:43 CST 2005
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last visit: Sun Sep 16 20:44 CST 2012
[RELATED]

I hope it's an exhaust manifold leak. That would be loud.
And less expensive to fix than this story...

I had a loud knock from engine in my '86 245 at about 350K miles.
Turned out to be a head gasked leak from cyl #1 to cyl #2.
Coolant + oil passages were not involved - this was cylinder to cylinder.

Combustion pressure was crossing between #1 + #2 attempting to force the piston against its normal travel. Not good. Probably caused by overheating years earlier; it finally broke through the gasket. Cured with a head gasket + head replacement.
--
[aka Sophie's Maintainer] Sven: '89 245, IPD sways, E-fan conversion, 28+ mpg - auto tranny. 850 mi/week commute.






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