Re: Evinrude 25 hp, too hot to handle.
OK, it was a busy if not frustrating night.<br />Did a compression check, looks great<br />Cyl 1 125<br />Cyl 2 120.<br />Pulled the head to check the water passages, nothing major in the way of gunk found in either the head or crank case jackets. Bores look really good with no sign of a piston grabbing anywhere. Piston crowns black but remarkably free of carbon.<br /><br />Pulled the exhaust cover, (BIG MISTAKE).. 3 broken bolts!! Exhaust cover water passages were somewhat more restricted with some baked on dirt in the passages but still nothing really bad.<br /><br />Checked out the piston sides which also look great with rings looking nice and clean.<br /><br />Now I have to scrape out the jackets and get some new gaskets and GET THE BROKEN BOLTS OUT.. ARRRRGHHHH. Soaked in WD40 overnight and due to the fact that there is a lot of thread protuding was thinking of using two nuts in a lock nut fashion close to the surface where the bolt enters the alloy face. Don't want to break them off level with the face but if they don't come out I guess I'll have to try heat.<br /><br />Should get a chance to check out the water pump tonight but think it will be OK as well.<br /><br />Haven't a yet found why this engine would have got hot. Thermostat tests fine as well.<br /><br />By the way the "restrictor" is actually a plug and blocks the water gallery going to the top part of the exhaust cover. Weird but another old fella who worked on these for years said it was an ammended configuration by OMC. Australian motors only??
