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  #1  
Old 10-11-2013, 02:45 PM
NASA515 NASA515 is offline
 
Join Date: Nov 2011
Location: Hansville, Washington
Posts: 536
Default Rotax SB Crankshaft Journal

Rotax has released an Update to their SB inspecting the Crankshaft Journals.

http://legacy.rotax-owner.com/si_tb_...-912-064ul.pdf

The Revision changes the one time inspection into a 100 hour inspection and expands the serial number list of affected engines.

(They'll keep expanding the Affected List until they get all of us!)

Bob Bogash
N737G
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  #2  
Old 10-11-2013, 07:29 PM
roger lee roger lee is offline
 
Join Date: Sep 2013
Location: Tucson, AZ
Posts: 322
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The new Rotax bulletin affects approximate 3700 engines (that's what I was originally told) verses the original 450 (approximate number).
It stems from the shaft straightening at the factory when these shafts are pressed together. They thought 2 or more bends was the problem, but learned even one bend could be an issue. It is rare and they are just trying to get out in front of this which is better than waiting years and having someone like the NTSB force the issue like they do for the auto MFG's. Rotax tends to be very proactive in handling problems once discovered. If you manage to hit the unfortunate cracked shaft lottery then the engine has to come off and go back to a distributor for a shaft replacement and rebuild. Yes, Rotax will help out.
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Last edited by roger lee : 10-12-2013 at 01:31 PM.
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  #3  
Old 10-12-2013, 05:45 AM
todehnal todehnal is offline
 
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Location: Kentucky Lakes area in KY
Posts: 931
Default Close one!!

Hey Roger Lee. Thanks for your input. The strange thing with my 912ULS is that I purchased the engine from Van's in November of 09. My serial number starts with 6775, and it looks like the AD addresses serial numbers that start with 6777. So, I guess I am lucky, so far at least. It missed me by a couple of thousand engines.

Tom
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  #4  
Old 10-12-2013, 11:14 AM
RFSchaller RFSchaller is offline
 
Join Date: Oct 2010
Location: Phoenix, AZ
Posts: 2,441
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Does anybody know where to get the ROTAX CS-PTO Gauge P/N 876260 ? I looked on the websites for Lockwood, CPS, LEAF and Aircraft Spruce, but couldn't find it. I even have an email out to my German cousin to see if he can get me one.

Does anybody know if a fiber optic at the mag plug hole could be used to inspect for a cracked journal?
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  #5  
Old 10-12-2013, 07:34 PM
RFSchaller RFSchaller is offline
 
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Location: Phoenix, AZ
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I heard from my German cousin. He said the bulletin hasn't been issued in Germany yet. That seems strange.
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  #6  
Old 10-12-2013, 11:02 PM
roger lee roger lee is offline
 
Join Date: Sep 2013
Location: Tucson, AZ
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I have tried myself to get a gauge. I was told they weren't in the system yet. So we'll have to wait a few weeks for this to catch up. My own engine is in the affected group. The fiber optic camera won't work. It's too big even with a 9mm lens, it needs to go in at an angle and you need to push against the shaft gear hard enough to try and make it move. The bulletin should be world wide already. It is on their main website.
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  #7  
Old 10-13-2013, 03:09 PM
hufise hufise is offline
 
Join Date: Jun 2010
Location: Uster, Zuerich, Switzerland
Posts: 30
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I found the SB-912-064

It is this for German: http://www.flyrotax.com/portaldata/5/dokus/d05766.pdf

You have to look for 912S

Daniel, Switzerland
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  #8  
Old 10-13-2013, 08:48 PM
lewy lewy is offline
 
Join Date: Nov 2009
Location: Jackson Ohio
Posts: 138
Default Service Bulletin

I watched the rotax 100 hour check the crank journal video, how does a feeler tell you have a crack or don t have a crack ? Also a question for Jack, what do you mean, Rotax will help out?
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  #9  
Old 10-13-2013, 11:10 PM
roger lee roger lee is offline
 
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Location: Tucson, AZ
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The feeler gauge will not tell you if you have a crack only if it is completely broken. This lets the more forward part of the shaft to shift a little forward and allows the feeler gauge to go in past the mark.
Rotax knows this is a factory caused defect and will most likely help out with the repair, but I'm not sure exactly how much.
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  #10  
Old 10-14-2013, 06:42 AM
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Dgamble Dgamble is offline
 
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Quote:
Originally Posted by NASA515 View Post
Rotax has released an Update to their SB inspecting the Crankshaft Journals.

http://legacy.rotax-owner.com/si_tb_...-912-064ul.pdf

The Revision changes the one time inspection into a 100 hour inspection and expands the serial number list of affected engines.

(They'll keep expanding the Affected List until they get all of us!)

Bob Bogash
N737G
It doesn't look all that hard to do the test yourself in the procedure video:

http://rotax-owner.com/index.php?opt...article&id=431

This assumes that the tool, which looks to be not much more than a simple feeler gauge, becomes available. I still couldn't find one on Lockwood as of this morning, but it seems as if that would be just a matter of time.
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Last edited by Dgamble : 10-14-2013 at 06:44 AM.
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