Hello, I replaced the impeller on a Yanmar 3JH2E about a month ago, and I was checking over the engine last weekend and noticed some wetness coming through around the impeller cover. I tightened the cover bolts (they were not really loose), and the leak still continues. When I replaced the impeller, I also replaced the o-ring, so that should not be the issue. That said, the old o-ring had a tear (the cover was leaking, though more so then). The face of the water pump was also a little rough, presumably from people prying with angled needle nose pliers in the process of removing the old impeller. That said, the cover itself was smooth, and the groove for the o-ring was fine as well.
I personally don't like the idea of relying on Yanmar's very thin o-ring for sealing something that is below the water line. I am thinking about getting some thin cork gasket material, and cutting a proper gasket, applying teflon grease to it, and using a gasket instead. Is this a bad idea? By the way, our boat is a 1994 C&C 37/40+, and the way the engine is mounted in the boat, it is nearly impossible to get to the bolts to remove the water pump, and even removing the starter is not exactly a fun job, again due to poor access to mounting bolts. Thanks for your insights! Bruce Whitmore (847) 404-5092 (mobile) [email protected]
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