It sounds to me like it's time to open the gear box and check the needle
bearings on the counter shaft and the ball bearings on the main shaft..
also the side wear on the shifter forks. They are bronze (like) and new
brass/bronze welding rod can be tinned on to renew spacing.. dave
On 9/4/2014 4:11 PM, D&B Lambert wrote:
> I've also been battling the vibrating/rattling gearshift lever on my TR3A
> for some time now. A few years ago (maybe 20K miles) I replaced the
> driveshaft u-joints and had the shaft balanced. Some months ago I got a
> copy of the Service Bulletin (mine is a little different than the one Randal
> posted) concerning gearshift rattles and performed the recommendations: I
> enlarged the trapezoid hole in the lever cap, and also tried the short piece
> of rubber tubing on the lever, neither of which made a bit of difference,
> except for making it much more difficult to shift into reverse. I've
> machined some shims/buffers out of Delrin for under the cap to prevent metal
> to metal contact in that area. No luck. I tried a stiffer/weaker gear
> lever spring. No difference. I tried hollowing out the gearshift knob and
> epoxying in a metal slug for dampening, again no luck. On that note, I have
> tried at least 4 different gear shift knobs (including an original hard
> rubber one) with no change in the vibration. The vibration and resultant
> chatter/rattle is much more sever when accelerating. I'm now into the habit
> of steering with one hand and holding the gear lever with the other to
> somewhat dampen the rattle. I'm kind of out of ideas, so I am following
> this thread closely. Anyone have any other ideas? Is the torpedo-shaped
> counter weight available anywhere? Does it really do anything? Couldn't I
> just make one out of a slug of steel and fab a bracket of some sort, or does
> it have to be a certain weight to cancel a specific harmonic? I dunno....
> Any suggestions? Perhaps I need to revisit the driveshaft/u-joints?
> Thanks for wading through this.
> Dennis
>
>>> There is a service bulletin (which
>>> I don't seem to have handy, will try to post tonight) about
>>> putting a piece of rubber hose on the shift lever inside the
>>> spring.
>> Found it, finally.
>> http://goo.gl/Hpn6Rb
>>
>>> They also tried adding a brace (later on, TR4A
>>> maybe) to the top cover, and even a rubber-mounted
>>> counterweight on some models.
>> According to the TR4 SPC, the brace was all TR4 (although there were two
>> different versions); the counterweight only gearbox CT17815
>> through CT35719.
>>
>> Randall
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--
Dave Porter Porter Custom Bicycles 2909 Arno St. NE Albuquerque, NM
87107 505-352-1378 Go HERE: my world www.porterbikes.com/
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