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Crack in exhaust manifold


TRevver
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Can anyone advise the best way of treating this crack in the exhaust manifold on a 2L mk1 Vitesse?

 

Is it likely to get worse? I’ve read on at least one forum that exhaust manifold cracks can coke up over time, partly solving the problem.

 

Thanks in advance 

 

 

8FF98932-F74F-444B-B9E2-D285C4D67E7D.jpeg

 

40C66383-192C-4619-9329-986BFF3885EF.jpeg

477AED13-19C2-4BC0-92DF-54C02DF84280.jpeg

Edited by TRevver
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The Mk1 manifold is a little prone to cracking, especially if the nuts at the two ends are over-tightened. They generally don't tend to spread much, though. If it's blowing, a bit of high temperature epoxy "chemical metal" might do the trick, if you can manage to squeeze it in there.

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If you want to weld it up, then drill out the ends of the crack and grind the rest until almost through to provide an angle for the weld to go into.  The difficult bit is that the whole cast iron manifold must be heated before welding, to at least 400C. If you can bury it in dry sand after, all the better.  A weld into the cold metal will heat, then cool the cast iron quickly, allowing it to become brittle.

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My Mk1 GT6 manifold blew into two pieces on a run back from Doune Show; I had to replace with a stainless manifold as having it repaired was both very complicated and very expensive by comparison - John's explanation is probably the correct way to do it (possibly it could be repaired with just a hole rather than a fracture) but I was told at the time, about 2001, that it couldn't be repaired.

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Your manifold is from a pre-Stromberg Vitesse 6, 1962 to late 1965. The difference being the plates for mounted the Solex air-cleaner assembly.

In the short term I would repair as given above. Brazing should be considered.

Long term I would source a second hand replacement.  2 Litre Vitesse Mk1, GT6 Mk1 and 2000 Mk1 Saloon all have the same type of exhaust manifold.

Dave

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Not sure if it would work on a crack in an exhaust manifold which is constantly heated and cooled but an old fix for a porous casting ie pin holes was iron filings  rammed into the hole and sulphuric acid which rusted the iron filings to seal the hole.

Dad taught me that when coming into our co foundry when an old hand was suggesting that a largish casting with numerous pin holes would have to be recast. 
Peter T

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Picture is of crack in a Mk1 2L Vitesse manifold I removed, fitted a spare, not the first I've had crack, one a leg cracked all the way round. This crack has now been welded by a local welding company, he only charged me ten pounds, coffee and biscuit fund money, due to length of time he took and I had the feeling he was not 100% confident in the repair.

Regards

Paul

 

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