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Old 08-11-2013, 04:49 PM   #1
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Exhaust Manifold Bolts LOOSE

I was under the bedroom hatch today to see if the radiator needed cleaning and found 2 bolts on the exhaust manifold loose enough to turn by hand.

These were at outlet #4, both upper and lower were loose. I retightened them to the same torque as all others (40 pounds)

Did I do the right thing??? Everything else looked fine, and I had not noticed any problems with the engine sound, boost, exhaust brake, etc.

I haven't started it since and want to make sure I did the right thing before running the engine.

It is a 2006 built Cummins ISC 330.
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Old 08-11-2013, 05:00 PM   #2
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If the bolts had been loose for a while, the gasket may already be shot.
You won't know till you start the engine; before you do ;clean any black carbon marks from around the manifold flange, on the side of the head. After you start the motor, listen for a tick/squeak noise that would indicate an exhaust leak. If no noise , then, check the area after about 100 mile drive , looking for black lines around the gasket area, indicating a need for a new gasket.
No noise , no indication of an exhaust leak ( carbon lines ) then you got lucky.
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