I have noticed the rear exhaust manifold on my 3.2l AJ16 is cracked. While I am not 100% it was ok when I bought the car, it certainly has got worse. What are the conditions that cause the problem? It’s it extrem temperatures, or is it fast heating and cooling?
I noticed shortly after a long motorway drive during which I pushed quite hard at times reaching speeds of 150mph (that’s about all it will do, although I was still away from the rev limiter). I am pretty sure we won’t be allowed to drive that fast for much longer here in Germany, they are pushing for a 130km/h speed limit, but that’s a topic for the pub.
Would that motorway drive have done it?
What are your experiences trying to weld these manifolds?