Cracked crankcase - HCS Snowmobile Forums

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Old 03-19-2019, 08:36 PM   #1 (permalink)
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Default Cracked crankcase

Picked up a project 13 Pro RMK 800. Iím assuming sled has some seriously bad detonation, lower rod bearing on pto side is non existent. Put a nice little hole in the case and chewed it up pretty good. I know cases can be welded, but with this one being so chewed up makes me worried. Posting some pics and looking for some input. Iíve got a line on a 14 motor with a Carlís 900 big bore. This sled is currently turbo charged. Think I should rebuild factory motor and stay boosted or go big bore? Thanks for any input!


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Old 03-19-2019, 08:37 PM   #2 (permalink)
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It also chipped this ring groove on the upper case.


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Old 03-19-2019, 08:49 PM   #3 (permalink)
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I don't know anything about the big bore you asked about. But in regards to the pictures, as long as the bearing journals are still true and stay that way after welding, it should be safe to use.
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Old 03-19-2019, 08:59 PM   #4 (permalink)
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Ok thanks for the reply, just makes me nervous cause seemed like the rod may have thinned out the cases but I may be overthinking it.


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Old 03-19-2019, 11:32 PM   #5 (permalink)
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Personally, I would go with new cases. Especially if you're going to go turbo again.
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Old 03-20-2019, 02:11 AM   #6 (permalink)
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Perfectly safe to weld those cases, I’ve had many repaired that were FAR worse. Those are non stressed areas so they don’t matter if there is a repair.

The chipped ring groove won’t cause you any issues either, but it is a result of improper crankshaft removal. It shows that the crank was knocked out of the cases at an angle instead of straight on.
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Old 04-01-2019, 05:58 PM   #7 (permalink)
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Quote:
Originally Posted by ILSummit View Post
Ok thanks for the reply, just makes me nervous cause seemed like the rod may have thinned out the cases but I may be overthinking it.


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Like Nick said, that's no big deal. If you want someone good to weld it who has done a bunch of those, and has a special mandrel that fits tight in the bearing housing bores and keeps them true while welding, and also is a certified master welder, Jwsnoweld.com He isn't to far from you as far as shipping goes.

Or, if you want to buy new cases, I will buy that case from you.

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Old 04-01-2019, 09:32 PM   #8 (permalink)
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i had my wife's 600 pro-r case welded. it had a quarter size hole out through it and i didn't have the piece that was missing. my brother machined it after welding and we bead blasted the case after that. you can't tell is was ever repaired. that was 4000 miles and four years ago.
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Old 04-01-2019, 09:40 PM   #9 (permalink)
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Cool, Iím gonna have it welded. Iíve cleaned them up but havenít sent them anywhere yet, was still looking around. Iíll look into who you recommended.

When I found the crack I definitely thought I was screwed, nice to know they can be welded back together. Thanks for the input


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