Fixing Cylinder scratches with good old JB Weld...? - Snowmobile Forum: Your #1 Snowmobile Forum

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post #1 of 12 (permalink) Old 02-06-2004, 10:31 PM Thread Starter
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Fixing Cylinder scratches with good old JB Weld...?

I bought an old 1977 Polaris colt for $100. They thought it needed crank bearings. So tonight i split the whole engine in two. It needs 2 crank seals but no bearings..However when i pulled one of the cylinders off there was two deeep scratches. One of the wrist pins came out and wore deep scratches in the cylinder bore. Now the guy I bought it from ran it all last winter like this...He must have bought it from somebody who wrecked it, put a new piston, slapped it back together and sold it as quick as they could. The engine has a brand new piston. There wasnt even carbon on the top when we took the head off..how could he run it all winter and not carbon the top of the piston? Must not have run very well because there wouldnt be enough compression to push the gas up to the transfer ports..

Anyway..i dont want to spend any money on this old thing. They say JB weld will fix cylinder sleeves...but does it? Has anybody heard anything on this? Thanks!
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post #2 of 12 (permalink) Old 02-09-2004, 05:39 AM
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I assume it might work, but you need to get it smooth and get it to match the rest of the cylinder, and I don't think it would last long between the rings scraping it, fuel breaking it down and the cylinder expanding will cause it to crack. Try it, you've got nothing to lose. Can't you find a used cylinder jug anywhere? They're pretty cheap, and the engine would be perfect then.
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post #3 of 12 (permalink) Old 02-09-2004, 02:50 PM
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I dont think that it will work, I think the heat will cause the JB weld to melt. If it was mine I'd try it though and see what happens, you only paid $100 for it, you won't be losing much $$.
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post #4 of 12 (permalink) Old 02-09-2004, 04:58 PM Thread Starter
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yes, your right. I don't have much to loose. If it runs for a winter say, tear it down every summer and do it again! lol..the only thing it will probably wreck the piston and break the rings. But, the piston does trap it in there...I was trying to find how hot a 2-stroke engine runs because JB welds good up until 500 degrees F. The engine must run hotter than that...I'm goin to hone it out and slap her on and drive it around the field, let cool, drive, cool.
hahahha. Thanks for the input!


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post #5 of 12 (permalink) Old 02-09-2004, 05:52 PM
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If you try it out, let me know how it makes out. I'm real curious to see how it works, i've never heard of anyone doing that before. I had an 86 quadracer that I had JB weld holding the bottom and side case together, it never leaked.
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post #6 of 12 (permalink) Old 02-10-2004, 09:09 AM
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I'd be concerned that the JB Weld would damage the seals or head when it came off.....even if it is a very small amount.
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post #7 of 12 (permalink) Old 02-10-2004, 04:02 PM Thread Starter
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yea...i know. But...the scratches are probably 1 1/2 inches from the top of the stoke. when the explosion happens, the piston is up flush against the JB. The only time it it sticking out is when the piston goes down and even then its only a little bit showing. I dunnno...i'm going to put it together tongiht maybe. I'll keep you posted on the results!


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post #8 of 12 (permalink) Old 02-12-2004, 10:57 AM
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Check out the NGK sparkplug website tech section. It talks about the operating temp. in the cylinder and at the plug. Don't think the JB will hold up. Good luck! www.ngksparkplugs.com

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post #9 of 12 (permalink) Old 02-13-2004, 06:22 PM
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For what it's worth I work at a Class 8 truck dealership and when a customer wants to get an engine back togther cheap that has block errosion we have used JB with success.
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post #10 of 12 (permalink) Old 02-13-2004, 11:03 PM Thread Starter
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Ahhhh! Thats what I like to hear!

Well we put my engine back together tongiht. Its goin to be in the body tomorrow and i'm going to be heading up the field with it...for how long, I dont know. Im in the process of selling it! hahaha.


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post #11 of 12 (permalink) Old 03-14-2004, 08:34 AM
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Talking

I had an old cougar with that crappy 500cc fan cooled engine. It did the same thing, gouged the cylinder wall. I did use JB weld on it. I applied it, waited for a day or so, then honed the crap out of it. It lasted for a season, then the crank went, JB weld was still hanging in there.

Make sure the wall is emaculately clean and dry before you start.

Good luck

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post #12 of 12 (permalink) Old 03-25-2004, 10:05 AM
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Remind me not to buy that sled. I would go to a swap meet this summer and find a different cylinder and fix it properly. Riley

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