Can anyone offer some advice? I have a 110 with a 2.5Na diesel. where the manifold joins to the downpipe i am getting serious blowing. we at first replaced the ring gasket which did not help, so I tried firegum exhaust paste, this works initially but deteriates very quickly. I recently bought a replacement engine and noticed that the seller must have had the same probs as on exactly the same place was a wedge of exhaust paste. Can anyone tell me if this is a common problem with these engines, and any usefull tips on solving this problem. Anyhelp would be much appreciated.