[ROVERNET - UK] 2000TC Gearbox trouble & Lucas #40660 dist.
Gordon Harrower
griffo at comcast.net
Sun Sep 10 17:36:51 BST 2006
Fletcher wrote:
> Hi guys-
> My first post, though I've been lurking a while. I'm in NW
> Pennsylvania, 4 dead 2000, 2SC, 2TC
> Re:
>
> "Gordon Harrower <griffo at comcast.net>
> The symptoms, which emerged abruptly, were an inability to shift into
> 2nd, 3rd, and 4th gears. The shop to which I brought it seemed
> intimidated by the whole thing, but offered the theory that the rubber
> spacers in the gearshift were worn, causing excess play in the
> mechanism."
>
> In my experience - 40 yrs fixing British, incl a bunch of Rovers, this
> problem is due to the failure of the third motion shaft bush on which
> are located 2nd & 3rd gears. In fact, I bought (real cheap) my first
> 68TC in 72 because it had just this problem. The one piece bush has a
> thrust washer machined in the center of the bushes for the two gears.
> When it breaks up, the gears and synchro hubs are no longer located
> endwise on the shaft. This lets all sorts of interesting stuff happen,
> in a random manner. Like when you try 2nd gear, 2nd moves forward away
> from the synchro, pushes 3rd forward, pushes 3/4 synchro forward, and
> therefore tries to engage 3rd & 4th at the same time as second. It can
> do things like kick itself out of 3rd when you come off the gas,
> auto-selecting 2 or 4, whichever is least desireable. Or, it won't go
> into some gear(s) as you experienced. All this changes depending on
> where the fragments are, and what the loads on the gears, selectors,
> and detents are. The forces on the linkage from all this cause the
> various detents to fight each other, and the end movement of the gears
> makes multiple synchros try to synch their respective gears all at
> once, which can't happen. Very exciting! When I drove mine home in
> very hilly terrain, I could usually get 1 & 4, but 2& especially 3
> were difficult, and the car had had no maintenance in about 45000
> miles, hence had little power available. I met or heard of a number of
> cars with this trouble; when I bought the new parts for mine I was
> told that the new bush was of improved spec because of this problem -
> it sure cost a lot! That may mean that most cars had it replaced (and
> cured) if they had many miles.
> The various rubber bushes in the linkage will cause all sorts of
> sloppy, but won't do this. Nothing for it but to pull the gearbox I fear.
>
> The Lucas distributor mentioned a couple of days ago is listed as
> "Humber new series 1 and 2, Super Snipe, 1959 (later)" in the Lucas
> master catalog. Will likely work in most 6 cyl applications, but not
> quite the correct advance curve for anything else.
>
> Fletcher R Millmore
>
>
>
>
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Update. After finding a new gearbox for my TC, I drained the oil from
the old one. It was filled with the residue, from tiny bits to some as
big as the head on a quarter, of a synchromesh ring, which explains
everything. Gordon.
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