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MG TD TF 1500 - Gearbox question
|In my gearbox the 1st / 2nd gear selector shaft (#74) has a groove in the left end as shown in the picture. I know a circlip goes into the 3rd /4th gear selector shaft (#69) groove but does anyone know if a circlip is fitted to the groove in the 1st /2nd shaft. If not does anyone know its purpose? I would ask Barrie Jones but I've inundated him with questions and I thought I'd check here first.
BTW. I have Barrie's video but the 1st / 2nd gear selector shaft in his video does not have the groove.
|I found a poor quality photo of my TF gearbox after rebuild. Looks like my shaft also has the groove, but I didn't install a circlip. Disclaimer: I'll be taking it apart later this year, so I may find that I'm wrong.|
|Lonnie, thanks. It is strange, I have a TF gearbox, at least it is stamped TF, but it doesn't have the upgrades that were introduced during the TD production run. The center selector shaft has no circlip slot, and the main shaft had no detent for the 3rd / 4th gear sliding hub and it is not the longer shaft supplied later. Also the main shaft had no keyway for the speedometer gear. I changed out the main shaft to the upgraded one but still have the originaL selector shafts. A guy on the MG Experience site said his 1st / 2nd gear shift rod did have a circlip. I guess I'll add one as a precaution.
I'd be a little bit carefull there
Fitting a circlip 'could' restrict the travel of the shaft
I'd be tempted to select the gear and check to see where the circlip slot ends up in the selected position--If the groove disapears into the housing, fitting a circlip would limit it's travel and stop the gear from being fully engaged
Are you sure that your gearbox is from a TF? Peter Hehir says that numbers stamped onto TF gearboxes should start with the letter "U". Gearboxes stamped "TF" are from a TD. Confusing!
Here are three bits of information about T-Series gearboxes.
++ First, a post on the BBS by Peter Hehir about the numbers stamped onto T-Series gearboxes.
++ Second, gearbox part numbers and changes from the TD and the TF Service Parts Lists.
++ Third, see pages F.6 and F.7 in the TD/TF Workshop Manual for more information about changes and gearbox numbers. (As noted by Peter.)
> T-Series Gearbox Numbers Stamped Onto Case
(Search the archives for thread title "Gearbox Numbers" for responses to Peter's post)
Thread: Gearbox Numbers
Posted 07 January 2014 at 10:59:11 UK time
P Hehir, New South Wales, Australia
I've discovered the gearbox number is stamped into the top face of the gearbox casing underneath the lid, along with the following info:
TD Gearboxes were made in numerical sequence, where the first letter is always T & the second letter is a letter from A to Z. The following 3 numbers ran from 001 to 999.
With TF boxes the first letter was U, the second a letter from A to Z, with the following 3 numbers again running from 001 to 999.
Y-type boxes used the same format, where S is always the first letter & the second letter was a letter from A to Z & also numbered sequentially to 999.
The following is from F.6 of the manual:
Gearbox No. TF 513. Engine No.3114 Balls peened.
Gearbox No. TF 939. Engine No. (?) New 3/4 shaft with circlip.
Gearbox No. TJ 800.Engine No.6533 Additional ball added & new 3/4 shaft with indent.
So TF513 (a TD gearbox!) came before TF939, and TJ800 was about 3,000 later (they didnít use letters I or O).
Engine numbers can be misleading because engines and gearboxes were both made in batches, so an early engine could have had a later gearbox fitted to it or vice versa. Because of the age of these vehicles it is also quite possible that a box may contain a variety of early & late components including gears, shafts & hubs sourced from a number of different cars.
Does anybody know if a record exists of the gearbox that was originally fitted to a particular car? At the time the manual was printed such a record obviously existed. I have a photocopy of the Abingdon log book page for my car which only shows destination, handing, car number, engine number & build date.
Peter TD 5801
> T-Series Gearbox Part Numbers
TD Service Parts List AKD834, June 1958
Part #SA2906/9 (Starting XPAG/TD501)
Part #AEB3027 (Starting XPAG/9408)
Part #AEB3028 (Starting XPAG/16482)
TF Service Parts List ADK804
Part #AEB3028 (Starting XPAG/80301) throughout TF XPAG and XPEG production
TD Service Parts List AKD834, June 1958
Part #X22900 (Starting XPAG/TD501)
Part #168210 (Starting XPAG/168210)
KEY FOR SPEEDOMETER GEAR
Part #X20139 (Starting XPAG/TD501)
Part #2K2124 (Starting XPAG/16978)
See the Service Parts Lists for more changes.
Link to TD Service Parts List
Link to TF Service Parts List
Click the download icon to save to your computer. Downward pointing arrow with bar across tip - upper right of screen. Must save to use bookmarks for easy navigation around the parts lists.
The manuals are also searchable by using the "find" feature in Adobe Reader. Edit; Find; enter text in the "Find" window.
|Lonnie, thanks very much for the excellent information. My gearbox does indeed have the TF designation. I'll have to pull the top cover to get the numbers. I did notice one minor error.
Part #168210 (Starting XPAG/168210) Should be Part #168210 (Starting XPAG/16978)
So the earlier parts in my gearbox are appropriate in light of the TF number. The gearbox numbering system probably is not that odd since the TF didn't exist when the gearboxes were stamped with TF. BTW, the gearbox was purchased separately it did not come with my 51 or 53 TD. Again, thanks for the info.
This thread was discussed between 21/03/2019 and 22/03/2019
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