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cristalclear13
Joined: 19 Sep 2007
Posts: 363
Location: Southeast Georgia
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 Posted: Mon Jun 09, 2008 6:04 pm Post subject: Broken protection washer |
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Take a look at what I found wedged in behind my fan belt tonight. The protection washer that is directly behind my fan belt broke. (Number 10 in the CPS picture) I have a Rotax 503 DCSI. I am blessed it didn't break anything else, like the fan belt.
Early symptoms included an increase or reduction in RPM while not moving the throttle. However the fan belt was still at good tension at that time.
Most recent symptoms included major vibration when starting the engine while the idle was still low. I also felt a shaking on take off. After a couple times starting with such vibration, I checked the fan belt again and it was extremely loose. I took the cover off and found this broken guy sitting there.
Whew! 
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_________________
Cristal Waters
Kolb Mark II Twinstar Rotax 503 DCSI Sept 2007 - sold Sept 2012
Private Pilot Aug 2008
ELSA Repairman for N193Y April 2008
Rotax 2 stroke maintenance April 2009 |
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donaho1(at)verizon.net
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| Posted: Tue Jun 10, 2008 2:42 am Post subject: Broken protection washer |
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Cristal, How many hours on your 503? Lanny N598LF Do not archive
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cristalclear13
Joined: 19 Sep 2007
Posts: 363
Location: Southeast Georgia
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| Posted: Tue Jun 10, 2008 4:45 am Post subject: Re: Broken protection washer |
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Hard to tell really. I bought this Mark II used last year, prepared it for airworthiness inspection and started flying it in April of this year. The Hobbs meter only reads around 35 hours (I think it was a rebuilt engine), but no telling how old the part that broke was.
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_________________
Cristal Waters
Kolb Mark II Twinstar Rotax 503 DCSI Sept 2007 - sold Sept 2012
Private Pilot Aug 2008
ELSA Repairman for N193Y April 2008
Rotax 2 stroke maintenance April 2009 |
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russ(at)rkiphoto.com
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| Posted: Tue Jun 10, 2008 11:38 am Post subject: Broken protection washer |
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Next time you feel a "major vibration " or a "shaking on takeoff"--
better find out what it is BEFORE you fly again
do not archive
On Jun 9, 2008, at 10:04 PM, cristalclear13 wrote:
| Quote: |
<cristalclearwaters(at)juno.com>
Take a look at what I found wedged in behind my fan belt tonight.
The protection washer that is directly behind my fan belt broke.
(Number 10 in the CPS picture) I have a Rotax 503 DCSI. I am
blessed it didn't break anything else, like the fan belt.
Early symptoms included an increase or reduction in RPM while not
moving the throttle. However the fan belt was still at good
tension at that time.
Most recent symptoms included major vibration when starting the
engine while the idle was still low. I also felt a shaking on take
off. After a couple times starting with such vibration, I checked
the fan belt again and it was extremely loose. I took the cover
off and found this broken guy sitting there.
Whew! [Shocked]
--------
Cristal
Mark II Twinstar
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=187062#187062
Attachments:
http://forums.matronics.com//files/broken_protection_washer_530.jpg
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cristalclear13
Joined: 19 Sep 2007
Posts: 363
Location: Southeast Georgia
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| Posted: Tue Jun 10, 2008 12:22 pm Post subject: Re: Broken protection washer |
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I flew it twice after I felt the major shaking because another ultralight pilot said his rotax shook normally like that until the RPM came up. And I had read the same thing on a forum. The weather had turned suddenly hot and humid and I wondered at the time if that had anything to do with it suddenly shaking so much more at low RPM. I also had wondered if my prop was off track, but I checked that and it was still good. So I flew it to see if I could get anymore "symptoms". When I got the symptom of shaking on takeoff I quickly got to the ground and didn't fly her anymore.
I was told I didn't need to check the fan belt every time I flew, but I know now that I'll be checking it before every flight.
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_________________
Cristal Waters
Kolb Mark II Twinstar Rotax 503 DCSI Sept 2007 - sold Sept 2012
Private Pilot Aug 2008
ELSA Repairman for N193Y April 2008
Rotax 2 stroke maintenance April 2009
Last edited by cristalclear13 on Sun Jun 15, 2008 4:44 am; edited 1 time in total |
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cristalclear13
Joined: 19 Sep 2007
Posts: 363
Location: Southeast Georgia
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| Posted: Sat Jun 14, 2008 12:58 pm Post subject: Re: Broken protection washer |
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I got my new protection washer. As you may be able to see from the picture that it looks quite different from the old one that broke. I have an older 503 engine (it is not dual ignition), so I'm wondering if either someone put the wrong part on there to begin with or if perhaps Rotax had made an improvement to that protection washer since then.
The new washer has a smaller diameter hole (better fit) and two prongs that look like they poke into the backside of the fan (better security). My fan didn't have the holes for the prongs to go into so we had to make them.
The MAJOR vibration is gone when I start it up now. And the RPM is staying steady where it's set.
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_________________
Cristal Waters
Kolb Mark II Twinstar Rotax 503 DCSI Sept 2007 - sold Sept 2012
Private Pilot Aug 2008
ELSA Repairman for N193Y April 2008
Rotax 2 stroke maintenance April 2009 |
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