Brass nuts [ Manifold Hardware ]

[tahoe healey]

I am about to re-install the intake and exhaust manifolds on my BJ8 and I see where Moss sells brass nuts(10 of them)and regular nuts (7 of these) but does not specify where to use each. (The PO had them random and mostly regulars and a couple of brass) Now, I would assume the brass go where it's hottest and that would be the exhaust but there are too many brass nuts compaired to the studs for the exhaust manifold. These are different than the manifold to exhaust six nuts. Any one have any help for me?

 

[Ralph F.]

Re: Brass nuts

Hi t.h.,
I just checked on my BJ8 and the steel nuts are on the intake manifold, and the brass nuts are on the exhaust. At the front and the back of the engine where the manifolds meet and one nut covers half of each manifold, brass is used. Be sure to use washers as well. As you note, the exhaust manifolds to the downpipes connect with 6, smaller brass nuts. Good luck.

 

[Dave Russell]

Re: Brass nuts

I count 10 brass nuts from front to back on exhaust manifolds;
Front manifold, front port - one bottom hole, one half top hole, (other half is intake) next two ports - three in a triangular pattern.
Rear manifold. First two holes - three in a triangulat pattern. last port - one bottom hole, one half top hole.
This leaves seven steel nuts for the intake only positions.

Or from front to back
Stud #1 = brass
#2 = brass
#3 = steel
#4 = steel
#5 = brass
#6 = brass
#7 = brass
#8 = steel
#9 = steel
#10 = steel
#11 = brass
#12 = brass
#13 = brass
#14 = steel
#15 = steel
# 16 = brass
#17 = brass

Make sure that the flanges on the shared intake & exhaust positions are exactly the same thickness. If one is thinner than the other, put a shim between the thin flange & the heavy washer to keep them the same. Otherwise, due to the stud & heavy washer's reluctance to bend, there will not be full clamping pressure on the thinner flange. This problem is especially likely to happen when different manifolds or aftermarket headers are used.
D

 

[tahoe healey]

Re: Brass nuts

Thanks, Ralph and Dave. i love those easy to follow instructions. So what does the brass do anyway?

 

[Keoke]

Re: Brass nuts

/ubbthreads/images/graemlins/savewave.gif
T.H. it turns funny colors when it gets hot-Keoke--- /ubbthreads/images/graemlins/devilgrin.gif

 

[JamesWilson]

Re: Brass nuts

Brass doesn't rust. Easier to take off again, if you have too.

 

[Bruce Bowker]

Re: Brass nuts

You may want to consider some high temperature anti-seize on the nuts also. Again easier to remove in the future.