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I have undertaken a topend rebuild for a 1990 350w engine in our ski brendella. The boat was improperly winterized last year and four of the six freeze plugs in the engine block were popped out from ice. One plug was popped in front of #5 cylinder (head) and the intake manifold was cracked just infron of #1 cylinder (head) in the water inlet housing. The heads were removed and sent out to a machine shop. They were magnafluxed and checked for cracks, none were found. Heads were in generally good working order. There was minor warpage on one and they were both resurfaced and a valve job performed. The engine was run for about 15 minutes at idle with water pumping into the case through the plenum under the intake manifold under the water inlet housing which was cracked. All the milky oil was drained out and now I am worried about doing all this work and having a crack in the block that will pump oil into the case. I have checked all of the cylinder walls and they look pretty good. I have inspected the exterior of the block around all the water passages looking for cracks in paint or metal. None found. Has anyone had experiences with cracked blocks and how apparent was the crack? And any other suprises I can plan on encountering with the water in the oil? Engine only has 320 hours origional on it. Just don't want to spend all this time and money to find out we were worse off than before. Any thoughts???? Thanks Jason
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This sounds like alot, but I had to do it to find a leak. Unhook the block to exhaust manifold hoses and plug them with something that won't leak air. Disconnect the seawater intake somewhere before the engine and connect in a pump or air supply that has a gauge to monitor pressure and a shut off. Apply 5-10 PSI and see if it immediately drops. I had the luxury of using a Snap-On radiator tester that has the gauge and pump as a unit. They also make a dye that can be added if you have a fresh water system that then uses a Black Light to find the source, and if you do have a fresh water system just borrow the radiator tester and leave all the hoses connected.
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