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Todd Renaud
Joined: 21 Oct 2001
Posts: 205
Location: United States, Texas, San Antonio, TX
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 Posted: Wed Aug 08, 2012 9:41 pm Post subject: Clutch making metal sound and then stops spinning |
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When the engine is not running and I spin the axle so the chain turns the drum - it spins fine until it hits a certain speed and then makes a grating metal on metal sound and everything stops. It will still turn after that and can just repeat the process.
When this first happened, it was on the track and seemed to run fine. Replaced the clutch drum and 11 tooth bushing but that didn't fix it.
Any ideas on what this could be? My clutch puller broke tonight so have to get another one before I can look at clutch myself - but it seems fine from the outside and I am new to all this so don't know what to look for anyway.
I have uploaded a video (5 secs) of the noise it makes when turning if this would help anyone: http://youtu.be/HoAbgtBwGng
Thanks. |
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Steven Novikoff
Joined: 23 Feb 2002
Posts: 229
Location: United States, California, Santa Monica
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| Posted: Wed Aug 08, 2012 9:51 pm Post subject: chain |
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| How tight is your chain? Doesn't look like you have much slack in it. |
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Todd Renaud
Joined: 21 Oct 2001
Posts: 205
Location: United States, Texas, San Antonio, TX
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| Posted: Wed Aug 08, 2012 10:08 pm Post subject: Re: chain |
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| Steven Novikoff wrote: | | How tight is your chain? Doesn't look like you have much slack in it. |
i don't think its too tight and it wasn't too tight when it first happened at the track - but how much slack should it have?
So just for grins, I went out and gave it more slack and it couldn't re-create the issue. Its too late to start the engine to see if it appears but I don't understand how that could affect it - don't remember the chain getting tighter our last time out when the problem first appeared (which was in the 3rd heat after 2 other heats that went fine).
Thoughts? |
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Ray Chiappe
Joined: 12 Apr 2003
Posts: 803
Location: United States, Nevada, Henderson
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| Posted: Wed Aug 08, 2012 11:30 pm Post subject: |
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| Some might say not legal, but try some grease in the bushing. |
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Ray Chiappe
Joined: 12 Apr 2003
Posts: 803
Location: United States, Nevada, Henderson
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Todd Renaud
Joined: 21 Oct 2001
Posts: 205
Location: United States, Texas, San Antonio, TX
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Todd Renaud
Joined: 21 Oct 2001
Posts: 205
Location: United States, Texas, San Antonio, TX
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| Posted: Thu Aug 09, 2012 11:20 am Post subject: |
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| Ray Chiappe wrote: | | Some might say not legal, but try some grease in the bushing. |
Ray, have you seen this specific situation before on the noise or is the grease related more to the general maintenance people talk about with the bushing? |
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Ray Chiappe
Joined: 12 Apr 2003
Posts: 803
Location: United States, Nevada, Henderson
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| Posted: Thu Aug 09, 2012 11:30 am Post subject: |
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| JMO, with the platic bushing they mfg. with xtra clearance because its plastic. If not lubed at certain rpm before the clutch engages there is vibration hence the noise. Don't run the chain too tight and I always lube the bushing and between runs squirt chain lube behind the nut, some will get in there. I have run an 11th for a whole season with no problems doing this. |
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Todd Renaud
Joined: 21 Oct 2001
Posts: 205
Location: United States, Texas, San Antonio, TX
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| Posted: Thu Aug 09, 2012 11:33 am Post subject: |
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| Ray Chiappe wrote: | | JMO, with the platic bushing they mfg. with xtra clearance because its plastic. If not lubed at certain rpm before the clutch engages there is vibration hence the noise. Don't run the chain too tight and I always lube the bushing and between runs squirt chain lube behind the nut, some will get in there. I have run an 11th for a whole season with no problems doing this. |
Thanks Ray. Makes sense - there wasn't a ton of consistency in the noise and the loosened chain last night seemed to make it very hard to get the noise / vibration. What lube do you suggest?
And what is your experience with the Rotax rule really on using lube?
Thanks again. |
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Rick Renaud
Joined: 18 Oct 2011
Posts: 5
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| Posted: Thu Aug 09, 2012 12:33 pm Post subject: BiJump clutch |
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| is it legal? |
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Ray Chiappe
Joined: 12 Apr 2003
Posts: 803
Location: United States, Nevada, Henderson
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| Posted: Thu Aug 09, 2012 3:28 pm Post subject: |
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| I know the new bearings have a O ring to keep lube from going into the clutch. Don't know about the bushing. For club racing prob. don't have to worry. Don't over do the lube. |
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Chris McGinley
Joined: 28 Nov 2008
Posts: 358
Location: United States, New Jersey, Sewell
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| Posted: Thu Aug 09, 2012 7:38 pm Post subject: |
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| Ray Chiappe wrote: | | I know the new bearings have a O ring to keep lube from going into the clutch. Don't know about the bushing. For club racing prob. don't have to worry. Don't over do the lube. |
Rotax released a new 11 tooth bushing that requires the o-ring, further restricting any grease from getting onto the clutch with the 11 tooth setup.
One other thought...are the bushings getting loose in the driver gear? In other words, can you easily push it out with your finger? If so, I'd suggest replacing the driver gear too. I had one that ate bushings and must've been slightly out of spec, but it wasn't visibly obvious.
_________________
Chris McGinley
Monster Raceworks
Rotax Masters
"Always stay one step ahead of the storm" - JZS
http://www.njkarting.org
http://www.btbsecurity.com |
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Todd Renaud
Joined: 21 Oct 2001
Posts: 205
Location: United States, Texas, San Antonio, TX
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| Posted: Fri Aug 10, 2012 11:21 am Post subject: |
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| Chris McGinley wrote: | | Ray Chiappe wrote: | | I know the new bearings have a O ring to keep lube from going into the clutch. Don't know about the bushing. For club racing prob. don't have to worry. Don't over do the lube. |
Rotax released a new 11 tooth bushing that requires the o-ring, further restricting any grease from getting onto the clutch with the 11 tooth setup.
One other thought...are the bushings getting loose in the driver gear? In other words, can you easily push it out with your finger? If so, I'd suggest replacing the driver gear too. I had one that ate bushings and must've been slightly out of spec, but it wasn't visibly obvious. |
Thanks! It was loose when first I took it apart but the new one was tough to get in there - so think that is not the case. I also swapped out the drum to make sure that wasn't the cause. However, I don't have an extra 11 tooth. Will try that if the grease and looser chain doesn't help. I know that I need the new style with the oring but was waiting to do that until EOY - but might try that if I have to buy another 11-tooth. |
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Todd Renaud
Joined: 21 Oct 2001
Posts: 205
Location: United States, Texas, San Antonio, TX
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| Posted: Fri Aug 10, 2012 11:22 am Post subject: |
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| Also, where can i get an update repair manual that shows the new clutch and how to work on it? All the PDFs I have are all 2000 or 2003 year updates...Don't know if they have info in there that helps also. |
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Todd Renaud
Joined: 21 Oct 2001
Posts: 205
Location: United States, Texas, San Antonio, TX
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| Posted: Mon Aug 13, 2012 11:21 am Post subject: |
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OK - here's the verdict after the weekend. Installed new bushing, ensured appropriate slack in chain and put a little grease inside the bushing. Worked great. Will follow that maintenance - and get a new 11tooth driver as there does seem to be some play in there that probably aggravates the situation.
Thanks for all the help from everyone. |
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