460 Manifold bolt length
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460 Manifold bolt length
'83 460 Econoline motorhome. Drivers side second to last bolt missing from exhaust . How long are those bolts? I can get a probe to go 1 3/4 in. past the manifold flange. Are the bolts longer than that? Has it broken or backed out? Can't see any others missing.
Please, please tell me it just backed out.
Can I buy only one?
Please, please tell me it just backed out.
Can I buy only one?
pedant
Joined: Jan 2008
Posts: 23,576
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From: EXTREME southwest CT
I replaced my exhaust manifold bolts with stainless when I re-powered my truck in 2008.
If I recall I used 1 1/2" long NC bolts, so that depth/length seems right. (not sure if a van manifold is a different casting)
The thread size is 3/8-16
You need not purchase a OEM bolt, there's nothing that special about them.
An old school autoparts store should have a set of orange Dorman drawers with all kinds of studs and bolts available.
The really trick exhaust hardware is bronze or copper plated so they don't corrode.
If I recall I used 1 1/2" long NC bolts, so that depth/length seems right. (not sure if a van manifold is a different casting)
The thread size is 3/8-16
You need not purchase a OEM bolt, there's nothing that special about them.
An old school autoparts store should have a set of orange Dorman drawers with all kinds of studs and bolts available.
The really trick exhaust hardware is bronze or copper plated so they don't corrode.
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Manifold bolt length
Jim, Thanks for the reply.
This is in a van and fortunately with the dog house cover off is easily reached. Only the one bolt is missing. the other appears ok. If there was no gasket, will I be able to just put in a new bolt and draw it down and close up the leak. I fear that is wishful thinking, but you gotta try.. Perhaps I should work the remaining bolt out and then draw them both up.
I don't want to have to pull the engine for this one bolt.
After thought....There is a metal spark plug heat shield tucked behind the ear/flange where the bolt is missing. I am assuming there is a relief in the manifold mating surface for that shield.
This is in a van and fortunately with the dog house cover off is easily reached. Only the one bolt is missing. the other appears ok. If there was no gasket, will I be able to just put in a new bolt and draw it down and close up the leak. I fear that is wishful thinking, but you gotta try.. Perhaps I should work the remaining bolt out and then draw them both up.
I don't want to have to pull the engine for this one bolt.
After thought....There is a metal spark plug heat shield tucked behind the ear/flange where the bolt is missing. I am assuming there is a relief in the manifold mating surface for that shield.
Last edited by ArdB; Feb 7, 2010 at 07:55 PM. Reason: After thought
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