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6 cyl Bristol cars Type 400 to Type 406

Latest 403 issue

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Old 09-10-18, 09:42 AM
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Join Date: Sep 2010
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Default Latest 403 issue

The exhaust pipe sleeve no longer screws securely onto the front manifold. Am I likely to need to replace both parts, or were they designed so that one component would fail first? Following up on this, is it safe to replace them eith second hand parts?
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Old 09-10-18, 08:17 PM
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In Racing can supply the original exhaust system manifold nut which is how they describe the sleeve you refer to, I have seen a few of these damaged over the years and also manifolds where brute force has failed to achieve what the perpetrator set out to do.
More common I found was deterioration of the threads on the manifold itself either through rust or burnt away because things had become a bad fit.
If you are able to try the nut from the back pipe on the front manifold ( I am assuming they are a good fit) that should determine which component needs replacing, I don't know if the end of the manifold could be built up and the thread re cut and even if it could be done if it would be a cost effective option but out of interest I will ask my friend Brian who is a very clever engineer and welder and see what ideas he comes up with.
Second hand might be an option from a reliable source but it is worth remembering that when new these components were hand lapped together to give a good seal without any exhaust sealants so if you can, try and get a pair that are fitting and tightening up properly.
Another option I have seen on a few cars is where new manifolds and down pipes have been fabricated, often in stainless steel, which have done away with the original type of manifold/front pipe joint completely.
Geoff.
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