Hey guys, need some help with this issue. I bought this 77 thompson open bow a month back. It had super clean oil at the time of purchase which made me suspicious. Ran it on sea trial for about 30 minutes and oil came back fine. It was cheap so I went ahead and bought it.
After 3 days of hard use I started getting water in the oil in my 130D. Did not notice oil in the water which would indicate an oil cooler failure. No water leaking anywhere in the bilge and no cracks on exterior of block. Compression test showed 90,90,80,100. Thought that was okay. Pulled the water pump housing to see if the seals went bad which would allow water into the timing cover, seals were fine and the holes in between were clear. Pulled everything apart and took the manifolds and the head off.
The gasket looked fine, no noticable cracks anywhere inside the head or block. No indication on the gasket that there was a leak between the cooling holes. Pulled the oil cooler and took it apart. Tested it in a bucket of water with compressed air to see if any of the tubes had a leak. No leaks whatsoever. The intake side of the oil cooler did not have an o-ring, but I cannot see how this would make any difference as this oring does not seperate the water from the oil, just is a cushion between the bolt-on end and the main housing.
So I couldnt find any problem with the head gasket, oil cooler, or water pump housing.
When I took off the thermostat housing I noticed that there was no thermostat! This is the 130D which doesnt have the closed cooling system like the other similar models. Only raw water cooling, no antifreeze. I have read that this somehow may lead to overheating. When running it hard those first three days the temps were fine. Any way this could cause a problem which would allow water into the oil? Should or should I not install one? If so what temp?
What should I do next? Thinking of taking the head to a radiator shop to have it pressure tested. I plan on installing a new manifold gasket and new head gasket, just dont want to put it all back together and have the same problem. Thanks in advance for any advise!
After 3 days of hard use I started getting water in the oil in my 130D. Did not notice oil in the water which would indicate an oil cooler failure. No water leaking anywhere in the bilge and no cracks on exterior of block. Compression test showed 90,90,80,100. Thought that was okay. Pulled the water pump housing to see if the seals went bad which would allow water into the timing cover, seals were fine and the holes in between were clear. Pulled everything apart and took the manifolds and the head off.
The gasket looked fine, no noticable cracks anywhere inside the head or block. No indication on the gasket that there was a leak between the cooling holes. Pulled the oil cooler and took it apart. Tested it in a bucket of water with compressed air to see if any of the tubes had a leak. No leaks whatsoever. The intake side of the oil cooler did not have an o-ring, but I cannot see how this would make any difference as this oring does not seperate the water from the oil, just is a cushion between the bolt-on end and the main housing.
So I couldnt find any problem with the head gasket, oil cooler, or water pump housing.
When I took off the thermostat housing I noticed that there was no thermostat! This is the 130D which doesnt have the closed cooling system like the other similar models. Only raw water cooling, no antifreeze. I have read that this somehow may lead to overheating. When running it hard those first three days the temps were fine. Any way this could cause a problem which would allow water into the oil? Should or should I not install one? If so what temp?
What should I do next? Thinking of taking the head to a radiator shop to have it pressure tested. I plan on installing a new manifold gasket and new head gasket, just dont want to put it all back together and have the same problem. Thanks in advance for any advise!
