Date: Mon, 25 Sep 2006 21:31:18 +0100
From: Colin Stamp <col.dustbinnospamp.plus.com>
Subject: Re: Gear Grinding


>>Just to wind up the pedantic wick a bit higher, The gears *do* grind >>as well as the synchro sleeves - they grind against each-other :o) >Well, maybe your gears "grind" against each other, but mine just quietly >transmit power!! The gears don't grind against each-other, they grind against the synchro sleeves. >>I don't have any experience of the 9000, but I'd guess it won't have >>sychromesh on reverse so "they all do that sir". >I don't know about the 9000 either, but my 900 is synchronized in reverse, >so I would guess the "high-end" 9000 would be too. Yep. Just checked and my 9-3 has it too. For some reason I thought it was rare to have sychro on reverse. I must be getting out-of-date. >probably the synchromesh getting a bit tired on that gear. It could >easily carry on for huge mileages in that state, but you'll need to >get used to matching the speed a bit more accurately to avoid the >crunching i.e. wait a bit longer for it to spin down in neutral before >pushing it into third. >I agree - it could go a long time once you get used to nursing it. But it >coul also break in city traffic. The OP's concern about metal pieces in >suspension is legitimate, and he probably finds shavings on the magnetic >plug when he changes transmission oil. Agreed, it might fail sooner, but it's unlikely that the OPs fault will cause the gearbox to fail in a stranding-you kind of way. swarf in the oil might cause more wear in the rest of the gearbox, but its already well past it's best. The failure mode will be that the duff synchros will just get worse until the driver can't stand it any more and does something about it. It might even get to the stage where it starts jumping out of gear, but the car will still go along. >>Changing oil spec might help, but if you want >>to really fix it, then it'll probably need a gearbox re-build. >Funny, it seems re-building has gone out of style. Now that I a changing >out my gearbox, I thought I could get at least a few dollars for my old >one, which runs fine, and probably needs nothing more than a couple of >synchros to be good again - but no one wants it. "What on earth would >you do with a used gearbox" they all say. That's probably me being out-of date again then. I did have a gearbox re-built on my last 9-3 though. Then-again, I reckon that was just the shyster garage ripping off the warranty company. Cheers, Colin.

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