The car is a 1994 acclaim, 2.5 litre original engine, with about 150km. I've decided to rebuild the engine because of increasing oil consumption, reduced power and gas mileage, and a coolant leak to cylinder # 1.
The exhaust valve guides all seemed to have slipped down into the cylinder by as much as 0.3 inches. Is this cause by engine overheating? Can the valve guides be pressed back into position? Is there something I should do to prevent this problem on the rebuilt engine?
Also, I've noticed there is a small crack between the exhaust valve seat and the intake valve seat of each cylinder. Should I weld these cracks, replace the heads, or leave them as is?
Any advice would be appreciated.
David