Blown primary clutch - Polaris RZR Forum - RZR Forums.net
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post #1 of 20 Old August 15th, 2019, 05:16 AM Thread Starter
 
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Blown primary clutch

Went to cross a river and was on Low spinned the belt pretty hard. When arriving the other side there was smoke coming out of clutch box was sure I just blown the belt
But I was surprised I haven't so I rode back home and opened the clutch to check the belt and I was horrified when I saw the upper back sheeve totally destroyed and part of the front sheeve missing.
Has anyone experience something like this?
The motor seems to run fine normal RPM at idle and when pressing slightly on gaz the primary clutch start to squeeze the belt but I did not want to higher the rpm.
The inside of the clutch box is filled with dust but no metal parts from the primary
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post #2 of 20 Old August 15th, 2019, 05:32 AM
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Re: Blown primary clutch

Quote:
Originally Posted by mfong View Post
Went to cross a river and was on Low spinned the belt pretty hard. When arriving the other side there was smoke coming out of clutch box was sure I just blown the belt
But I was surprised I haven't so I rode back home and opened the clutch to check the belt and I was horrified when I saw the upper back sheeve totally destroyed and part of the front sheeve missing.
Has anyone experience something like this?
The motor seems to run fine normal RPM at idle and when pressing slightly on gaz the primary clutch start to squeeze the belt but I did not want to higher the rpm.
The inside of the clutch box is filled with dust but no metal parts from the primary

I have never seen this before. Did water enter the clutch housing at any point? How many miles since you last had the clutch cover opened? Any damage to the clutch cover? It almost looks like the belt wore right through the sheaves...and then when they got thin enough they cracked off in chunks. But you said you found no chunks...maybe they came out the CVT exhaust?


EDIT:
How does the secondary look? Any damage to the sheave faces? How about the back side of the belt that we cannot see in the picture, is it chewed up?
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post #3 of 20 Old August 15th, 2019, 05:36 AM Thread Starter
 
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I checked the clutch about 300 miles ago changed to a new evo badass belt and cleaned the sheeves everything seemed normal.
The side of the belt looks ok now but the tooth are worn.
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post #4 of 20 Old August 15th, 2019, 05:42 AM Thread Starter
 
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The secondary turns well but both sides look to be stuck I wasn't able to screw the secondary clutch tool spreader but from first look no damage
On the outside
Checked the cvt exhaust no chunk just a lot of black dust
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post #5 of 20 Old August 15th, 2019, 06:03 AM
 
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Re: Blown primary clutch

That's crazy. Sounds like your secondary is stuck closed and smoked your primary. Curious what Todd will say.
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post #6 of 20 Old August 15th, 2019, 06:12 AM
 
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Re: Blown primary clutch

I think when you spun the belt pretty hard it created a great deal of heat in the primary and melted the metal. That is one totaled clutch. The fact there is no metal says melted to me. Going to need serious clean out. I would renew the seal on the motor shaft as it had to take a lot of heat and will likely fail soon. Also time to change engine oil. All that heat was transferred into the crank and into the engine oil. Cheap maintenance to hopefully avoid more problems later. Maybe change the trans seal as well due to possible contamination that may cause it to fail as well. The belt is toast as well. Do not even keep as a spare.

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post #7 of 20 Old August 15th, 2019, 06:17 AM Thread Starter
 
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That is the most probable explanation but shouldn't the belt blow before reaching enough temperature to melt the clutch?
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post #8 of 20 Old August 15th, 2019, 06:19 AM
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Re: Blown primary clutch

Quote:
Originally Posted by sandblster View Post
I think when you spun the belt pretty hard it created a great deal of heat in the primary and melted the metal. That is one totaled clutch. The fact there is no metal says melted to me. Going to need serious clean out. I would renew the seal on the motor shaft as it had to take a lot of heat and will likely fail soon. Also time to change engine oil. All that heat was transferred into the crank and into the engine oil. Cheap maintenance to hopefully avoid more problems later. Maybe change the trans seal as well due to possible contamination that may cause it to fail as well. The belt is toast as well. Do not even keep as a spare.

I'm not sure what to say here other than aluminum is an incredible conductor of heat, and it melts at over 1200F, which is almost 4 times more than rubber. The engine oil? Motor shaft seal? Do you have any beach front property in Arkansas for me? BTW melted metal doesn't disappear magically...
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post #9 of 20 Old August 15th, 2019, 06:21 AM
 
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Re: Blown primary clutch

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Originally Posted by mfong View Post
That is the most probable explanation but shouldn't the belt blow before reaching enough temperature to melt the clutch?
This time it did not. Give the belt a really good inspection and you will find sever wear and flat spots. I have flat spotted belts but stopped the power when the smoked showed up. This looks like the belt can take a lot more than the primary.

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post #10 of 20 Old August 15th, 2019, 06:26 AM Thread Starter
 
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I inspected the belt the outer part of it are relatively ok but the tooth are worn. the aluminum did not disappear but turned in form of very dark dust.
It is like the alinum was grinded into dust
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post #11 of 20 Old August 15th, 2019, 06:28 AM
 
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Re: Blown primary clutch

Look real close and you will find the metal. The little round balls are the melted metal. Inside of case is full of black and those small beads. Some areas look like they have been bead blasted. Lots of hidden damage I suspect. Those beads got everywhere. Beads look like welding splatter. Signs of lots of heat.

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post #12 of 20 Old August 15th, 2019, 07:16 AM
 
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Re: Blown primary clutch

I believe I've seen similar threads on hot clutches and flooded clutch housing causing primary damage like this.
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post #13 of 20 Old August 15th, 2019, 08:09 AM
 
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Re: Blown primary clutch

That is typical when cold water hits super hot aluminum it cracks and breaks ...no big surprise ...dont do that
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post #14 of 20 Old August 15th, 2019, 08:09 AM
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Re: Blown primary clutch

Same issue here
Secondary all pitted like water inside housing
https://www.rzrforums.net/rzr-xp-100...ml#post5896768
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post #15 of 20 Old August 15th, 2019, 08:11 AM Thread Starter
 
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Thanks Frarzr will take a look
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