Welding a broken cast iron manifold

[Jonny69]

The engine mounts are pretty new because I replaced them and it doesn't move much anyway because it's mounted on a front and back cradle 'the old way'. Probably doesn't help that the manifold is coming up to 55 years old and it has had a quiet lazy life until I got my hands on it. Kind of feel sorry for that car

[phykell]

Originally Posted by Jonny69

The engine mounts are pretty new because I replaced them and it doesn't move much anyway because it's mounted on a front and back cradle 'the old way'. Probably doesn't help that the manifold is coming up to 55 years old and it has had a quiet lazy life until I got my hands on it. Kind of feel sorry for that car

If that's the case, you'll have to prepare yourself for the weld fracturing. A weld on cast iron is strong but it's also brittle of course. Get someone to rev the car while you're looking into the engine bay and compare the movement of the engine with how the exhaust is mounted - too much movement relative to the exhaust downpipe and the weld won't last at all. Try rocking the engine by hand - you shouldn't be able to if the engine is mounted firmly enough.

Engine mounts were the bane of my life on tuned Minis