---------------------------------------------------------- RotaxEngines-List Digest Archive --- Total Messages Posted Wed 07/19/06: 1 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 02:25 PM - Re: Re: RotaxEngines-List Digest: Squeak on Rotax 912S (Duncan McFadyean) ________________________________ Message 1 _____________________________________ Time: 02:25:59 PM PST US From: "Duncan McFadyean" Subject: Re: RotaxEngines-List: Re: RotaxEngines-List Digest: Squeak on Rotax 912S --> RotaxEngines-List message posted by: "Duncan McFadyean" 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" > > > 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. > >