Over size cylinder

Hello,

If you over bored a cylinder for 0.49mm on a WR240 LC 1985, is it possible the sleeve while crack?
The third over size and last is 70mm on my husky. I put a piston of 70.49 in it. And now the antifreeze goes in the cylinder when i start it, and the pressure go up in the radiator. Is it possible that the sleeve is cracked? And if it is cracked, can it be change.

Thanks

More likely Head gasket issues I would think. pretty hard to crack a liner unless it has been bored right through at the thinnest part. its possible that the liner is slightly skewed in the barrel and the boring bar has skimmed it out but any rebore machinist would spot that and let you know.

have you retourqued the head studs? did you use a sealant on the head gasket?


a few things to consider. best get it dried out so the big end doesn't rust.

good luck

Hello,

I disassembled my engine and send the cylinder and the head to my machinist. He put it on a pressure bench. No crack on the slive. The head was not flat. He over the head. Now I have to rebuild the engine.

Question: You talk about sealant (silicon) on the head, but if I read in my workshop manual it said that you need silicon on a 400 and 500. Do you still think that I need silicon on the head? I did put silicon on the head this time but not 20 years ago. And when you use silicon on the head it is very difficult to remove it after.

There are better sealants for the head than silicon but I recently reassembled my 400 W/C without any and it has survived.
try contacting Phil at husqvarna parts .com and see what he recommends. alternatively, Start a new thread titled head sealant, and 50 experts will put you straight