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Date: Mon, 13 Mar 2006 21:04:26 GMT
From: James Sweet <>
Subject: Re: C900 funny transmission sound in 3rd

Paul Halliday wrote: > in article, Dave Hinz at > wrote on 13/03/2006 15:39: > > >>On Sun, 12 Mar 2006 23:34:24 GMT, James Sweet <> wrote: >> >>>Recently the '88 C900 (5 speed) gearbox has been making unhealthy >>>sounds. I've noticed a slight whine in 5th, and then more recently when >>>engine braking in 3rd it makes a somewhat rattly/grindy noise, not >>>really nasty but not healthy either. Is this a common problem? >> >>Yes, the pinion bearings were beefed up a year or three after '88. >> >> >>>I'm >>>curious if the transmission is doomed to imminent failure, or if this is >>>simply a nuisance that may not cause any real problems for years. >> >>Only if you don't drive it much. Get it fixed (pinion bearings at >>least, more if you've driven it much) or find another box. '90 I think >>is when it was improved, I'm sure someone can confirm or correct. > > > I heard '89, but it may well depend on the market. > > Once repaired, the older boxes can be "strengthened" by using a steel > inspection cover plate. I think if you're getting grinding noises on > over-run/engine braking then it may well be very close to failure and I'd be > inclined to have the box looked at with a view to repair. > > Of course, driving style will affect things so take it easy on the > acceleration and perhaps use your brakes rather than the engine until you > have it fixed. Thereafter, I can't see why engine braking will put any > excessive strain on the box. > > Paul > > 1989 900 Turbo S > > What's involved in replacing these bearings? I'm quite adept and performing extensive repairs and have done a lot of engine work, I've never attempted to repair a gearbox though. I'm assuming it has to come out of the car and be disassembled?

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