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Triumph TR6 - Tranny Dropped or Srhared Clutch Fork Tapered Pin?

Original tranny (50,000 miles). 50Kmh in 2'nd, and then the gears felt like mush. Almost sounded like the exhaust was dragging. clutch seems ok, can get reverse with engine going, otherwise classic symptoms of a sheared clutch fork tapered pin.

Any thought (other than crying).

Thanks, Peter...
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Taken from the Archives:
clutch fork tapered pin has partially sheared and thus will not disengage making it very hard to shift when the engine is running. When the engine is off then it is easy to run through the gears. Your discription sounds like a classic sheared pin symptoms.
P Johnston

Sorry Peter,

A sheared or bent fork pin should not create any noise like the exhaust is dragging or create any different felling in the gears.

The only real symptom should be difficulty in shifting or even getting into gear from a stop as the fork cannot apply force to the pressure plate.

If you find that it is the fork pin the following links may provide some additional insight as to how to avoid this problem again. The first offers a very good way to remove the pin without resorting to the sawzall, while the second is really the better for beefing up the installation.

http://web.archive.org/web/20030626174132/www.buckeyetriumphs.org/technical/Clutch/ClutchForkPin/RemovingBrokenClutchForkPins.htm

http://web.archive.org/web/20030627042344/www.buckeyetriumphs.org/technical/Clutch/ClutchShaft/ClutchShaft.htm


Don
Yellowdog

Can you describe your problem again? I really don't understand the gears feeling like mush thing. If you're having trouble downshifting to second gear without grinding, join the club. I have to match engine speed (rev it just right) to downshift to 2nd, the synchro is worn. If you don't have trouble putting it in reverse at all, it's not the clutch in any way. Maybe your exhaust is dragging too? Just kidding.
Tom

Sure Tom, no Problem. I was rather distressed yesterday when I posted the thread.

While in 2'nd (& holding the shifter), I could feel as if there was something moving freely with lateral play from within the gearbox. I geared up to 3'rd, noticing it not being properly smooth, still feeling through the shifter that there was movement within the gearbox. This is when there was sound coming from the tranny that sounded like metal dragging. It felt like the gearing was loosening. Then it began to be very dificult to shift in or out of any gears. Pulled over (not too far from home), found that reverse could be selected without problems, then noticed that the clutch was starting to engage "a little" while the clutch pedal was depressed. Also got a blast of what might have been the throwout bearing noise. While turned off, I was able to select 1'st, start the car, and drive home in 1'st without stopping.

The lateral play I felt was if there were gear parts moving left to right (on a motor bike I could relate this to a gear selector fork moving freely along it's shaft). I can select all gears with the car off. I also have full fluid the the clutch reservoir.

That's as best as I can describe it.
P Johnston

The lateral play is a puzzler. Maybe there is a piece of something broken off in there that's making that movement. The sound could very well be the throwout bearing, if it's only when you push in the pedal. If it makes noise with the clutch pedal up, you probably have a bad bearing (or worse) in the transmission. Did it make noise while you were moving? If you're not much into the mechanical side of these beasts, maybe a trip to your favorite mechanic is the best thing. Maybe someone here has had gearbox/clutch problems like yours and can help you. If the transmission hasn't been abused and it's full of oil, I'd say it's unusual to need an overhaul at 50K miles. But maybe it sat too long at some point, and something rusted or siezed.

Anyway, a good TR guy should be able to give you a good opinion of the problem, hope it's not too serious. Luckily TR's aren't terribly expensive to repair.

I had a chip of something break off and get stuck in a valley of one of the gears on a Fiat I had. That made a loud clunk every time the gears turned. Pulled the cover and dug out the little devil, it was fine until I sold it. Had no idea where the chip came from.
Tom

Peter--I bet John Esposito at Quantum Mechanics in Connecticut would give you a free diagnosis. Worth a ring . . .

Rick O.
72 TR6
Rick Orthen

Doesn't exactly match my inexpensive comment, but he'll sell you an overdrive too.
Tom

This thread was discussed between 10/09/2005 and 14/09/2005

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