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Looking for help on fitting exhaust pipe to exhaust manifolds on 186S engine - one of the gaskets on my car was leaking so I thought I'd replace both at the same time. I found two different types of nuts when I removed, a couple of brass ones and a couple of regular or hi-tensile steel ones. One of the brass nuts had the threads stripped.
What are the correct type nuts to use? I thought maybe brass were used because they don't expand/contract and loosen under the hot/cold cycles of the exhaust? I fit hi-tensile replacements all round as local shop only had 1 brass nut. I'm planning on checking them regularly for loosening but should I be looking elsewhere for more brass nuts and swap them all out?
What torque should the nuts be done up to?
Thanks, Simon.
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Brass expands alot when heated, more than steel.
The reason they used brass originaly is its easy to remove during maintenance. You might find the steel nuts will sieze on and screw up your manifold studs in a few years.
I reckon they were brass nuts about 3/4" long originaly. |
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I like brass nuts on the exhaust studs because they don't rust & sieze as do the steel type. One problem though, is that they come loose quite often. I fit shake-proof washers to overcome the problem.
Dr Terry |
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Agree with DR Terry. Brass to stop corrosion.
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I have NOS GMH Correct Cadmium Plated ones in Stock GMH #3829086 is the Part number. They are factory crimped and act like a lock nut so they dont come loose . I also have NOS Asbestos 1-3/4 gaskets for 186s, genuine GMH also . Edited by user Wednesday, February 16, 2011 4:09:33 AM(UTC)
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