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582 crank replacement

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albertakolbmk3

Joined: 13 Jun 2009
Posts: 69
Location: Innisfail, AB

Posted: Thu Jan 28, 2010 10:23 am Post subject: 582 crank replacement

I realize that rotax says 300 hours but can a person magnaflux the crank to make sure it's ok. I know people will argue "what is your life worth" but $1200.00 for a new crank is outrageous! I think rotax uses this fact to their advantage (scare tactic). I'm pretty sure the original owner never replaced it at 300 hrs. It now has 475 hrs on it. Just want peoples opinions and what they have done.



thanks,



Tony

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_________________
Tony B.

Kolb MKIII C
Rotax 582
C Gearbox 3.00:1
WD 66" 3 Blade Prop

Eugene Zimmerman

Joined: 10 Jan 2006
Posts: 392

Posted: Thu Jan 28, 2010 7:10 pm Post subject: 582 crank replacement

Tony,

Much depends on your personal kind of flying and engine use, and your  

personal level of risk tolerance.

Some people change out cranks at 300 hrs as Rotax recommends, and some  

people have gone over 1000 hrs without failure and without ever once  

opening the engine.



It is your choice.



Gene

On Jan 28, 2010, at 1:23 PM, albertakolbmk3 wrote:



 	  Quote: 	
		   

 >



 I realize that rotax says 300 hours but can a person magnaflux the  

 crank to make sure it's ok. I know people will argue "what is your  

 life worth" but $1200.00 for a new crank is outrageous! I think  

 rotax uses this fact to their advantage (scare tactic). I'm pretty  

 sure the original owner never replaced it at 300 hrs. It now has 475  

 hrs on it. Just want peoples opinions and what they have done.



 thanks,



 Tony



 --------

 Tony B.



 Kolb MKIII C

 Rotax 582

 C Gearbox 3.00:1

 WD 66&quot; 3 Blade Prop





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p 83804#283804

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John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Thu Jan 28, 2010 7:24 pm Post subject: 582 crank replacement

> Some people change out cranks at 300 hrs as Rotax recommends, and some

 	  Quote: 	
		   people have gone over 1000 hrs without failure and without ever once 

 opening the engine.



 It is your choice.



 Gene


	




I agree with Gene Z.



ROTAX TBO for uncertified engines are "recommended" only.



Who knows when the bearings will fail?  I had a PTO end main bearing failure 

on a brand new Cuyuna ULII02 at 10.0 hours.



447 wrist pin bearing failure when we were still running caged bearings. 

Don't remember how much time was on the engine.



john h

mkIII

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John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

lucien

Joined: 03 Jun 2007
Posts: 721
Location: santa fe, NM

Posted: Fri Jan 29, 2010 5:31 am Post subject: Re: 582 crank replacement

 	  albertakolbmk3 wrote: 	
		  I realize that rotax says 300 hours but can a person magnaflux the crank to make sure it's ok. I know people will argue "what is your life worth" but $1200.00 for a new crank is outrageous! I think rotax uses this fact to their advantage (scare tactic). I'm pretty sure the original owner never replaced it at 300 hrs. It now has 475 hrs on it. Just want peoples opinions and what they have done.



thanks,



Tony 	




There's a fair bit of field experience on this that can help gauge what to do. Generally, with the 582, the probability of failures with the crank start to increase significantly after about 300 hours. This is true of the 503 to a lesser degree and the 447 to an even lesser degree than the 503, but especially truth with the 582. The 582 is suped up a bit more than the other (air-cooled) motors (503 and 447) and the crank is the main weak spot there.



It also depends on how hard the engine is run. The 582 isn't quite as durable at high power settings as the 503 and especially the 447. So if it lives at 6000+ rpm all the time, for instance, I'd personally make crank replacement required at 300 hours. 



I've seen 582 cranks weld themselves together on the bottom end at as low as 40 or 50 hours, tho that's fairly rare as long as the engine isn't run too hard. I've seen another come out of the case at 150 hours with almost 10 times the runout limit on the PTO end (failure was imminent in that instance).



My personal take: If I were running a 582:

- if typical power settings were 6000 rpm + all the time, crank replacement at 300 hours would be required regardless of visible condition (this is an underpowered or borderline abusive situation, IMO).

- 5400 to 6000, I'd start being more vigilant about keeping landing areas in reach around the 300 hour mark.

- 5400 on down, I wouldn't worry too much about replacement at 300 hours. I'd let it go to 400 or so.



But that's just my personal take based on what I've seen with the 582 over the years out in the field and what varous mechanics I've worked with on my own engines have reported to me. YMMV depending on your comfort level and budget, as always.



LS

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LS
Titan II SS

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