Potatodigger1 Posted February 8, 2022 Share Posted February 8, 2022 My son had a vibration last weekend, kept riding it and exploded the belt. He said the vibration went down when off the throttle. While changing the belt, noticed the clutch was broken. Did the clutch blow the belt, or the blown belt break the clutch????? Quote Link to comment Share on other sites More sharing options...
Doug Posted February 8, 2022 Share Posted February 8, 2022 Looking at some of the witness marks it looks like something came up and hit the clutch at some point and my have cracked it. May just be the pic Quote Link to comment Share on other sites More sharing options...
Potatodigger1 Posted February 8, 2022 Author Share Posted February 8, 2022 I will look closer at that when he brings it over this weekend, we were on pretty good trails? Could be bits of frost and belt residue? Thanks Doug! Quote Link to comment Share on other sites More sharing options...
racinfarmer Posted February 8, 2022 Share Posted February 8, 2022 (edited) How many times has that clutch been on and off? Is that the stock Polaris clutch bolt? I have 2 votes, in no particular order. 1 - the clutch was re-assembled incorrectly causing the cover to crack as you see here. Ran the bolts down all the way around the circle vs. crisscross. Maybe took some riding for the crack to appear. 2 - the belt blew at a higher rpm and the sheaves smashed together with no resistance (belt), cracking the cover. Edited February 8, 2022 by racinfarmer Quote Link to comment Share on other sites More sharing options...
Not greg b Posted February 8, 2022 Share Posted February 8, 2022 If it started vibrating before the belt blew more than like the clutch cracked and caused the vibration. Then the belt went Quote Link to comment Share on other sites More sharing options...
SlugsOnSleds Posted February 8, 2022 Share Posted February 8, 2022 I would check the run out on the crank with a dial gauge...I would also check the crank seal by spraying starting fluid on it when you get it back running. If the rpm's increase the seal needs to be replaced... Quote Link to comment Share on other sites More sharing options...
teamgreen02 Posted February 9, 2022 Share Posted February 9, 2022 1 hour ago, racinfarmer said: How many times has that clutch been on and off? Is that the stock Polaris clutch bolt? I have 2 votes, in no particular order. 1 - the clutch was re-assembled incorrectly causing the cover to crack as you see here. Ran the bolts down all the way around the circle vs. crisscross. Maybe took some riding for the crack to appear. 2 - the belt blew at a higher rpm and the sheaves smashed together with no resistance (belt), cracking the cover. The second is my guess. I was right behind him when it blew. A new cover can't be bolted on so I don't think it was an assembly issue. Quote Link to comment Share on other sites More sharing options...
racinfarmer Posted February 9, 2022 Share Posted February 9, 2022 32 minutes ago, teamgreen02 said: The second is my guess. I was right behind him when it blew. A new cover can't be bolted on so I don't think it was an assembly issue. I'd seen clutches mainly break posts off by running 1 bolt at a time to tight. Just get a thread or two started on every bolt all around, then break out the driver drill and fucking send it. Haven't seen a cover, but I'll never put it past someone. Quote Link to comment Share on other sites More sharing options...
Potatodigger1 Posted February 9, 2022 Author Share Posted February 9, 2022 Clutch has been apart more than most I think. Was on my sled when I bought it (junior class USXC ice racing sled, 400 miles on it). He knows how to assemble a clutch, just a bit at a time! Stock Polaris bolt Will be checking crank and seal for sure! Thanks for the responses guys! Quote Link to comment Share on other sites More sharing options...
mnstang Posted February 9, 2022 Share Posted February 9, 2022 That's pretty wild. That's a big crack so those towers must have spread outward a good amount. You have to ask why those towers might have spread, I think that is why the cover broke. Quote Link to comment Share on other sites More sharing options...
Crnr2Crnr Posted February 9, 2022 Share Posted February 9, 2022 Strange, I thought they caught on fire first? 🤔 My vote, clutch failed first. Where's @Tommcat? 1 Quote Link to comment Share on other sites More sharing options...
Tommcat Posted February 9, 2022 Share Posted February 9, 2022 12 hours ago, Crnr2Crnr said: Strange, I thought they caught on fire first? 🤔 My vote, clutch failed first. Where's @Tommcat? looks like a polar bear bit it 3 Quote Link to comment Share on other sites More sharing options...
Bontz Posted February 9, 2022 Share Posted February 9, 2022 1 hour ago, Tommcat said: looks like a polar bear bit it Winner!!! Quote Link to comment Share on other sites More sharing options...
polaris7541 Posted February 9, 2022 Share Posted February 9, 2022 jmo ,, belt/ clutch Quote Link to comment Share on other sites More sharing options...
XCR1250 Posted February 10, 2022 Share Posted February 10, 2022 Check tower spread first, if it's good and the rest of the clutch is good find another cover and have the clutch balanced. Quote Link to comment Share on other sites More sharing options...
racinfarmer Posted February 10, 2022 Share Posted February 10, 2022 On 2/8/2022 at 7:11 PM, Potatodigger1 said: Clutch has been apart more than most I think. Was on my sled when I bought it (junior class USXC ice racing sled, 400 miles on it). He knows how to assemble a clutch, just a bit at a time! Stock Polaris bolt Will be checking crank and seal for sure! Thanks for the responses guys! Usually the racers will take pretty good care of sleds, especially ice sleds. I'm leaning towards the belt blew and the sheaves slammed together. 1 Quote Link to comment Share on other sites More sharing options...
Potatodigger1 Posted February 10, 2022 Author Share Posted February 10, 2022 12 hours ago, XCR1250 said: Check tower spread first, if it's good and the rest of the clutch is good find another cover and have the clutch balanced. They are spread a bit, maybe not quite as wide as the crack is. A different cover will go on there, but it doesn’t just bolt up like it should. Not half the hole off, but enough that the bolts won’t go in without some muscle! Quote Link to comment Share on other sites More sharing options...
XCR1250 Posted February 10, 2022 Share Posted February 10, 2022 2 minutes ago, Potatodigger1 said: They are spread a bit, maybe not quite as wide as the crack is. A different cover will go on there, but it doesn’t just bolt up like it should. Not half the hole off, but enough that the bolts won’t go in without some muscle! ok, sounds like it's new clutch time then. 1 Quote Link to comment Share on other sites More sharing options...
Potatodigger1 Posted February 10, 2022 Author Share Posted February 10, 2022 Yep!! Quote Link to comment Share on other sites More sharing options...
Doug Posted February 10, 2022 Share Posted February 10, 2022 4 hours ago, Potatodigger1 said: Yep!! Throw the towel in before you take the crank out. Like others have said you should check the run out on the crank. I know Fastsledder has a rebuild clutch off an 800. This will have the large cover bushing but you should check in the taper that they are the same. Quote Link to comment Share on other sites More sharing options...
Potatodigger1 Posted February 10, 2022 Author Share Posted February 10, 2022 Towel has been thrown!! Will be checking the runout before firing it up again. Thanks for all the input guys. Hopefully he learned a lesson, if there is a vibration, find out why!! At least change the belt to see if it goes away!! Quote Link to comment Share on other sites More sharing options...
Potatodigger1 Posted February 11, 2022 Author Share Posted February 11, 2022 .001 runout and no change in rpm when sprayed. 😎😎 2 Quote Link to comment Share on other sites More sharing options...
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