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MG TD TF 1500 - TA gear box float or no float

Has anyone had any experience with a TA gear-box?I am asking on this site as it seems to have more response than the TA site, My problem is on stripping the gear box to investigate noises in first gear, I found 3.5m/m of end float in the lay shaft gears, there is no wear onthe thrust side of the gears and none in the box contact sides and no spacers or shims I have asked several people some say there shouldn't be any side movement others say there should be to allow the helical gears to align them selves. I have read the Brian Rainbow web site and even contacted him he seems to think there should not be any end float and checked his spare gear box spares but found no spacers with the lay shaft. I don't want to rebuild and replace engine and gearbox into car and then found I should have added spacers. Any comments or experiences will be greatfully received.
Regards Adrian Wells TA 2870 TD 0845
Thomas WELLS

The TA had a different engine then the later T cars and I assume perhaps a different transmission... you might try the ABC website as well?

http://www.vintagemotoring.net/forum/

There is also a T ABC user's form available by email....very busy forum.... (don't have the link)
gblawson(gordon- TD27667)

I don't know anything about TA gearboxes, but that is far too much unrestrained endfloat for any gear set. Helical gears especially would give nasty hammering on drive reversal. Something around .005-.010" max would be typical. With the exception of some boxes which use ball or roller bearings on the layshaft, all boxes I've ever seen have thrust washers at both ends on the laygear, either bronze, bronze faced or hardened steel. Usually one TW is of fixed thickness, and the other is selective for fit. Some boxes even have springs behind the TW to keep the laygear from thrashing around, but this is rare.

FRM
FR Millmore

http://www.mg-tabc.org/

George Butz

TA uses a Wolsley engine.

Geo. Butz and given you the best place for help.

Gord Clark
Rockburn, Qué.
Gordon A Clark

Thanks for you prompt replys I have since spoken to a gear box rebuild specialist, he refers the the gears as cross cut and the end float is there to allow these gears to self align and the end float will reduce when meshed, and it does but I thought there would be a lot of side stress on the gears, but he says this is normalRegards to you all Adrian Wells.
Thomas WELLS

Adrian -
Could you put up a picture of this? Sounds strange. I have no idea what he means by "cross cut". It could mean herringbone gears, in which case he would be correct, but those are very esoteric and expensive, not the sort of thing I'd expect in an early MG. Panhard built gearboxes (1950's) that were all herringbone, but they were also a state of the art gear plant at the time.

FRM
FR Millmore

Hello Adrian. In the later T series gear boxes we found that excessive end float of the laygear will cause the box to pop out of gear. We try to keep it down to about .005 by shiming between the box and the bronze thrust washer.

Butch Taras
R Taras

This thread was discussed between 05/07/2011 and 06/07/2011

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