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Old 08-03-2013
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Re: Confused about which oil weight to use

That makes one wonder why someone took the thermostat out. Possible overheating before? Taking the thermostat out causes the engine to run too cool, making it run less efficiently. I've heard that the valves can be affected because of too big a temp differential between too cool a casting and the hot valves. I would suspect some sort of clogging of the water jackets either by rust or silt that has accumulated. https://www.google.com/search?q=rust+clogged+cylinder+block&client=firefox-beta&hs=Ls7&rls=org.mozilla:en-USfficial&source=lnms&tbm=isch&sa=X&ei=7Jj9UbmoG7S24APv2IDgDw&ved=0CAkQ_AUoAQ&biw=1280&bih=564#facrc=_&imgdii=_&imgrc=LGC9_46s4ID-sM%3A%3BGiLHAdOvMgo9hM%3Bhttp%253A%252F%252Fwww.se atonsmarine.com%252F0_0_0_0_383_254_csupload_13653 65.jpg%253Fu%253D616639612%3Bhttp%253A%252F%252Fww w.seatonsmarine.com%252FWinterize.html%3B383%3B254Maybe if you can remove block drains or the engine zinc or find a freeze out plug, you can fish around with a coat hanger or fish tape to see if the water jackets are clogged. It's possible that clogging is causing hot spots so that even though water is flowing out the exhaust, it is not circulating around the cylinders.
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Last edited by smurphny; 08-03-2013 at 08:08 PM.
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