"My friend's engine overhe
"My friend's engine overheated. We had checked the raw water impeller - it was in good shape and fairly recently replaced - and had the heat exchanger boiled out. It still overheated in a big way.
I pressure tested the cooling system and it did not hold pressure. (I put my ear to the oil filler and heard bubbling sounds???)
The circulating water pump seemed fine. I pulled the head and found that the head gasket was in fine shape with no gaps. The head and block had no obvious leakage areas between cylinder and water jackets.
The #4 cylinder had the erosion around the exhaust port mentioned here and pretty extensive corrosion on the exhaust valve stem or guide. One local machine shop said it wouldn't work on the head, with the erosion on #4.
So we are left with a few options:
1) Put it back together with new seals and pray. If it doesn't overheat, we won't know why it did so. If it does, we are out the time and parts.
2) Get a new/rebuilt head. I can't find a listing on line from the links from the discussion back in May.
3) Get a used engine from the salvage yard.
4) Get a new/rebuilt short block (does that include the head?)
Any ideas where to search for the source of overheating, and parts?
Thanks.
Jeff"
"My friend's engine overheated. We had checked the raw water impeller - it was in good shape and fairly recently replaced - and had the heat exchanger boiled out. It still overheated in a big way.
I pressure tested the cooling system and it did not hold pressure. (I put my ear to the oil filler and heard bubbling sounds???)
The circulating water pump seemed fine. I pulled the head and found that the head gasket was in fine shape with no gaps. The head and block had no obvious leakage areas between cylinder and water jackets.
The #4 cylinder had the erosion around the exhaust port mentioned here and pretty extensive corrosion on the exhaust valve stem or guide. One local machine shop said it wouldn't work on the head, with the erosion on #4.
So we are left with a few options:
1) Put it back together with new seals and pray. If it doesn't overheat, we won't know why it did so. If it does, we are out the time and parts.
2) Get a new/rebuilt head. I can't find a listing on line from the links from the discussion back in May.
3) Get a used engine from the salvage yard.
4) Get a new/rebuilt short block (does that include the head?)
Any ideas where to search for the source of overheating, and parts?
Thanks.
Jeff"