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1. 02:25 PM - Re: Re: RotaxEngines-List Digest: Squeak on Rotax 912S (Duncan McFadyean)
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| Subject: | Re: RotaxEngines-List Digest: Squeak on Rotax 912S |
--> RotaxEngines-List message posted by: "Duncan McFadyean" <ami@mcfadyean.freeserve.co.uk>
I've had the squeak for 300 hours; either when pulling the prop trough by
hand or on shutdown. I'm pretty sure it is the dog clutch (i.e. NOT the
slipper clutch) that produces this.
I complained to my local Rotax agent when it was new. He said I was just a
trouble maker! This is the level of service that can be expected from
Rotax's illegal and anti-competitive policy of 'one Country, one Agent'.
Duncan McF.
----- Original Message -----
Sent: Monday, July 17, 2006 10:50 PM
912S
> --> RotaxEngines-List message posted by: "John M. Goodings"
> <goodings@yorku.ca>
>
> After flying our CH601HD with Rotax 912S (100 hours) last weekend, we had
> occasion to pull the prop through by hand. When pulled quickly, a squeak
> was heard from the front of the engine; the engine was hot. When we ran
> the engine again after lunch, the squeak was heard again for the last
> couple of blade rotations before the prop stopped. We had heard from an
> expert AME on Rotax engines that a few certified 912S engines had been
> assembled with an incorrect part in the slipper clutch in the gear box.
> (The mating surfaces of the clutch hub and the dog gear should both have
> an angle of 7 degrees, whereas one of the parts in the faulty assemblies
> had an angle of 0 degrees, meeting the other part at the wrong angle.)
> There was the possibility that some uncertified engines like ours had
> suffered a similar fate. Thus, our gear box was opened up by the expert
> AME; however, the correct parts had been installed. It was reassembled by
> him (with great care; it had to sit overnight for the correct Loctite
> sealant to set). When the engine was run approximately 40 hours later,
> the squeak had disappeared. We would be interested to learn if any other
> 912S users have encountered this characteristic squeak. If so, were they
> able to determine a clear-cut cause?
>
> John Goodings, C-FGPJ, CH601HD with R912S, Toronto/Waterloo.
>
>
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