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MG TD TF 1500 - dismantling gearbox

While starting work the box shows this stickout of the layshaft (?).

for the other side new pic will follow.

Is that okay?



W_Mueller

next picture

W_Mueller

This is not correct, from the marks on the bellhousing it looks as if the layshaft has been rotating in the holes, it should be fixed in place by a bolt at the rear underside of the main casting.

John
J Scragg

You can see this on page E10 of the workshop manual here.

http://www.ttalk.info/MG-TD-TF-WM.pdf

John
J Scragg

I guess the screw did run in troubles inside.
W_Mueller

Winfried,
If you intend to take the gearbox apart get your hands on Barrie Jones's DVD. It is very good. I can lend it to you if you want.

Regards
Declan
Declan Burns

Thank you Declan - I got it.
W_Mueller

Dismantling is in progress. As expected some parts are candidates for substitute e.g. cluster gear, strike dog 3&4, gears and bearings.

So I have the same questions as before regarding the rocker arms.

What's about quality of new parts or are used parts from Abingdon Spares a better option


W_Mueller

I removed the lay shaft some time ago. I used a dumby shaft to chase or lead in the shaft. Was worried about all those roller bearings.

Peter Dahlquist

Yes Peter - we did it the same way.

Additional question is:

The synchromesh units have cuts in the brass every 1/8".How deep should these cuts be? The document of Bob Grunau does not mention this fact.

W_Mueller


Here's what Bob said about synchro in a previous archive:


Bob Grunau cgrunau@pathcom.com

Yes, you measure between the steel gears with the brass synchromesh hub in contact with the first motion shaft or 3rd gear, or the 2nd gear in contact with the 1/2 sliding hub which has the synchro ring.
Look for a number between 0.040" ( no synchromesh left ) and 0.100" clearance ( equivalent to a NOS synchro).
For me, anything above 0.070" is less than half worn and I would use it. Less means you are approaching the end of the useful life of the synchro and I would not use it. Usually 3rd gear synchro is more worn than 4th as the 3rd synchro is used going up and down when shifting gears (ie. no down shift to 4th ).
Looking at the brass synchro rings will generally NOT tell you the degree of wear, the grooves always seem to look OK.
Email me directly if more info required
Richard Cameron


Another Comment--- Several years ago I had a third gear synchro that was worn, and I sent the gear to Bob Grunau who machined and installed a new brass synchro. Much cheaper than buying a new gear, and it was very well done.
Richard Cameron

Thank you Richard

What do you think about quality of gear spare parts in comparison with NOS?
W_Mueller


Well, I haven't had to buy gears that weren't NOS because luckily mine were all serviceable. However, I have bought the solid spline upgraded 1st gear sliding hub from Moss. It was good quality and close tolerance. I was able to find good NOS cluster and 1st gears but that was a few years ago.

Now let me say that most of the original omc gears and other steel items were not made of the best steel back in the day, and probably no hardening because I have found that a common file will easily cut into the metal. So, chances are that anything made today from major after market companies is probably better steel material. Further if they don't fit for any reason most companies accept returns without penalty except for paying return shipping. Personally, If I needed one and couldn't find a NOS part, I wouldn't be afraid of new manufactured quality from major suppliers (but, They are so expensive). Keep in mind that owners usually have no idea how many miles have been put on our transmissions before we opened them for restoration. For example, how many miles with poor quality oil does one think it takes before there is significant wear on the cluster gear shaft bearing area? I personally don't know the answer because I won't live long enough to find out.
Richard Cameron

The correct end float for the layshaft is 0.003 to 0.005 inches (3 to 5 thou) I used thicker thrust washers from Bob Grunau they worked very well.

John
J Scragg

Thanks John

If 0,003 to 0,005 is okay then 0,0004 will be right also - see

http://www.ttalk.info/Grunau.htm

I'have canceled the 0,002 in my documents.
W_Mueller

This thread was discussed between 05/12/2018 and 11/12/2018

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