MG TF Series User Manual

F THE GEARBOX----.-------
MODIFIED SYNCHROMESH HUB
Seetlon F.6
I
2
I
I
2
6
6
I
No. Off
I
Shifter Shaft Assembly (Top and 3rd)
Comprising :-
Shaft
Pin for Shaft
Rivet
for Shaft
The follOWing parts (for Service purposes) are deleted :-
No. Off
I
I
24245
SA.24JS
24246
24247
SA.2402!2
Striking Dog (Top and 3rd)
Sliding Hub (Top and lrd). with Sliding Cones
Comprising :-
Sliding Hub
Cone for Sliding Hub
Shifter Shaft Assembly
(Top and 3rd)
Comprising :-
21367 Shah
3648 Pin for Shaft
3649 Rivet for Shaft
and replaced (for
Service modification only) by :-
SA.2135JI Sliding Hub (Top and ]rd), with Sliding Cones
Comprising :-
Sliding Hub
Cone for Sliding Hub
S
pring for Sliding Hub
Ball for Sliding Hub
Shifter Shaft Assembly (Top and lrd)
Comprising :-
Shaft
Clrcllp
Pin for Shaft
Rivet
for Shaft
Striking Dog (Top and 3rd)
24246
24247
24248
1279
SA.2402!3
Cases have been found of the balls and springs
being ejected from the top and third synchro hub due
to discrepancies in the position of the third speed
shifter shaft stop on the gear change cover. To over-
come this (and also the possibility of the third gear
being inadvertently moved beyond Its position when
the gear thange extension cover is removed) a new
shifter shaft is being fitted with a clrclip which gives
a positive
stop for thi rd gear under all conditlons.
To further ensure that the synchro balls and springs
do not become released. each ball Is now being
peened into the synchro hub (each with two square-
ended depressions at the end of each ball hole around
the hub) ; also a modified top and third striking dog.
which is tapered internally each end. is now fitted to
maintain the synchro hub in the correct position.
24457
243n
3648
3649
24465
SA.2402J2
Gearbox (Prodllction Modifications)
Commencing Gearbox No. TF.939 for Series" TO" Midget.
The new shifter shaft is being fitted with a cirelip which gives
a positive
stop fo r th ird gear under all cond ltlons.
The follOWing parts are deleted :-
24367
3648
3649
REASSEMBLY OF THE SYNCHROMESH
MECHANISM
The stri king dog is placed against th e en d of the
sliding hub and pushed through into engagement with
it, when the balls wi If spring into an indentation
ground In the centre of the teeth and the assembly
is
completed.
Reassembly of gearbox
The reassembly of the gearbox, rnalnshaft, etc., is
carried out in the reverse manner to that detailed
for dismantling. but care must be taken when fitting
the layshaft to see that the tags on the thrust washers
at each end fit into the grooves in the bosses in the
gearbox.
Note.-For easy assembly of the layshoft with its
bearings. it is recommended that a dummy shaft 1\ in.
diameter by 6* in. long (14·29 mm. diameter by 161·13
mm. long) be used.
Care must also be taken in the case of the later
boxes to replace the eirelip on the forward end of the
third and top selector shaft.
Seetion F.5
are housed within the sliding hubs and register with a
central groove in the internally cut teeth of the strik-
ing dogs. Each sliding hub. therefore. can be pushed
out from its striking dog when sufficient effort is
applied
to overcome the springs.
The ball housing openings are peened over to
retain the balls in position and prevent their loss.
LOCATING BALL.
Fig. F.6.
This
part section of the gearbox indicates the lengthened
third speed shifter shaft and its retaining clrcllp and the
location of the additional locating ball in the synchromesh
sliding hub.
F.6
M.G. Midget. Issue 2 (H & E) 77618-10/52
Wishvilles Classic
Automobile Library

MG TF Series Specifications

General

Brand	MG
Model	TF Series
Category	Automobile
Language	English