by lord13 » Sun Aug 26, 2018 6:38 am
I had much the same issue with the engine in my old HB, nothing seemed to sort it, swapped the head gasket, same issue. Swapped the head, same issue. Welded up a crack in the block, replaced head, same issue. Fitted a 1256 head that I knew was spot on....( used home made sleeves on the bolts to enable fitting ) same issue. You'd've thought one of those measures would have thrown up a different set of results but no, the car did the same damn thing, just got hotter and hotter until it started missing. Turn it off and wait half an hour and you were good to go again...until it cooked up. . . .again. Only conclusion I could come to was the bottom end was screwed . . .in some way.
It was a rumbly old thing in truth. Anyway, i'm getting this engine back in a few weeks so i'll strip it down and have a look at the mains and big ends, and get the block checked out.
One issue that kept flaring up was the fact that no matter what way i tightened the head bolts, no matter what torque, after it had cooked up 3 of them at the back always need tweaking down again, I was leaning towards stripped threads or cracks around the bolt holes that opened up when it got hot. I'd already welded up one of these such cracks at the front, so if it had been mistreated in the past maybe more were cracked.
I just think that sometimes you have to give up and get a new/different engine.