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That serial tag is of an 85, the other questioon is does the engines welch plug serial number match the serail number on the tag? MOST 85's got replaced with new style engines under warranty as many of them cooked themselves. 60PSI is REALLY low, but this could also be due to the guage you used. I would try another compression guage if you can get access to one and see what you get then. As for running it with 0 compression in one cylinder, it may make it awhile or it may sling a rod through the block on the first run. If it isn't running on that cylinder and has no compression on it, then that means it isn't pulling any air through the carb for that cylinder. And when it doesn't pull any air, it isn't getting any fuel and no oil, so it is only a matter of time before a bearing in that cylinder locks up and comes un glued. Find out what is wrong with it first before your getting a tow in with a rod hanging out the block. It may just be a headgasket, or it could be a nic gouge down teh cylinder wall from a stuck ring that is just waiting to lift a sleeve out of teh block.
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Look at head gasket like therm said but thats as far as i would go, save my cash for something worth while!
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Got it. Check head gasket. New compression tester and DON'T run it as is. Any tips on removing the bolts without snapping them. I have done that in the past on a 90 Hyunday at the salvage yard. That sucks.
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Pulled the head and found a tore up piston head, shavings and a broke ring. Got photos of the gasket as well. Some are the photos are repetitive but I was trying to make sure that the shadows weren't blocking something important.
http://i23.photobucket.com/albums/b3...-04-32_307.jpg http://i23.photobucket.com/albums/b3...-04-26_698.jpg http://i23.photobucket.com/albums/b3...-04-17_203.jpg http://i23.photobucket.com/albums/b3...-03-25_846.jpg http://i23.photobucket.com/albums/b3...-03-17_702.jpg http://i23.photobucket.com/albums/b3...7-03-11_85.jpg |
i would say the 1/4 inch ring gap on the top ring might be where it all started. hard to tell, how does the cyl wall look?
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I didn't see any gouging. But it was discolored you could tell it was rubbing. It still looks smooth to my eyes.
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I would try spinning the fly wheel and see if that piston is moveing.I,ve seen where a cylinder had no compression and the rod be blown and the engin still run
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That white t-stat housing I'm betting was the cause of the failure. OMC changed out those white housings to a black housing in 87-88 due to problems with the white ones sticking and overheating. That engine looks to be LOOSE to say the least from the looks of the lower cylinder. Personally I would reccomend finding a good used engine Vs rebuilding that one. Speaking from experience, the 85 is a nightmare to try and get to run decent, and it will always be on the ragged edge of living unless you do ALOT of upgrades to it. 85 is a one year only set-up, and tthey just aren't really feasable to keep alive. Look for an 88+ 140 to replace it with.
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Well, DAMN!!! Not much more I can say but, DAMN!!! Guess I'll be content with the stuff I actually bought the boat for. Trashing a running motor seems so wrong. LOL
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