dirtdonkey
Member
I recently rebuilt my Yanmar 3110D 3 cylinder diesel tractor. When I looked at the new head gasket I received in my parts I noticed that it had 3 small metal rings where the cylinder would seal to the head and the rest was a pressed material with fibers in it. The gasket I took off was solid metal everywhere with various insets of different metals at certain locations for water jackets leading to the head from the block and where the pushrods ran back down into the block. I read from some previous posters that the new head gaskets were junk and I wondered about that comment. I'm now starting to believe it. My tractor runs great since I rebuilt it with one exception it keeps overheating the radiator, which is brand new along with a new water pump. I started it up, cold, and noticed that the overflow tank has bubbles coming out of the overflow line coming from the radiator. I tried to figure out what could be causing that and came to the conclusion that it must be a blown head gasket leaking from one of my cylinders to the nearest water gasket spot and then getting into the return path to the radiator. I don't know what else would cause the constant stream of bubbles to come into the over flow tank when its cold? I saw the bubbles before but the tractor was hot and had overflowed the tank and when I pulled over I noticed the bubbles but thought it was just from the hot water coming from the radiator. Does this sound logical to any of you or am I missing something. I'm getting ready to tear it apart again and probably put the old gasket back into the engine, after sealing it around the water jackets with some gasket sealer and hoping I get a better seal with my old gasket than I did with this new one. I'm open to any suggestions since I can't seem to find a new, all metal, head gasket like came from the factory.