fixing a manifold

Charlie M · Nov 8, 2011

My new A has a small hole in the manifold. The rest of the manifold is pretty solid so I'd like to fix the hole. Can I just braze it or is there another way. I'm a bit concerned when I go to clean the area around the hole to braze that its going to get bigger. I don't always have the best of luck trying to braze stuff.

Janicholson · Nov 8, 2011

Backing the weld area inside with charcoal, or carbon (or a mild steel plate if it will not restrict flow) will allow thin metal to be brazed fairly easily. Welding with Ni rod (again with backing) is also possible. If the hole is on a flat area, a Stainless Steel washer can be bolted in place (possibly on inside and out) Jim

CharlieNJ · Nov 8, 2011

Charlie, where is the small hole? Does it leak exhaust? Some manifolds have weep holes to allow water to escape if it comes in an uncovered exhaust pipe. I have an A with two weep holes on the underside of the manifold just above the carb. Also, I have an AV which came to me with a fairly long crack brazed with brass rod. It runs well. If you are going to weld/braze it it would need to be cleaned well, perhaps removed and sandblasted. Worse comes to worse, a new one is about $130.00.

Charlie M · Nov 8, 2011

Its about half way up the side on the exhaust. I coud probably leave it but I'm thinking it should be easy to fix. If it had anything else wrong with it I would probably buy a new one - may have to anyway when I get done trying to fix it.

sflem849 · Nov 8, 2011

Could you run a self tapping screw in it and grind the head off?

Like he said, a lot of manifolds have a factory pin hole in them to let water out.

Tom Fleming · Nov 8, 2011

Unless it is structurally compromised, OR if the exhaust is leaking towards a head sensitive area (carb), I wouldn't get too excited.

you can find decent used ones on eBay for 1/2 what a new one costs. New or used, unless you go to a dealer, you will pay shipping anyway.

gbs · Nov 8, 2011

if the metal is thin brazing is the best way you can heat it hot enough for the brass to bond without burning a bigger hole lightly put a layer along the edges of the hole then melt the rod onto the light layer then heat it just to bond to the brass to the brass a small place at a time until you get it covered

fixing a manifold

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Charlie M

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