,

GEARBOX Jumping out of gears Gear engagement Non interchangeability Modified 1 st motion shaft Alterations to workshop manual

G l ' G2 G3 G5

SERVICE

FOR THE ATTENTION OF SERVICE AND PARTS MANAGERS

AUTO-DISENGAGEMENT OF 1 st AND 2nd GEARS

To eliminate this possibility. a synchroniser assembly with coupling sleeve incorporating 'in-gear' grooves for 1st and 2nd gears was introduced at Engine Nos. 18 AMW-U-H 42550 and 18 AMW-U-L 20593 .

SUMMARY OF PARTS CHANGES

Old P art No. 22H 896

Description Synchroniser assembly -15t and 2nd speed .

SERV ICE DIVISION

New Part No. 22H 989

1-':>lJ>1ll.e<L..D.Y:

AUSTIN 1800

THE BRITISH MOTOR CORPORATION(AUSTRALIAj PTY. LIMITED

!D 50

·ree .... · ....... ica.1

El C-.r:a.11eti:n.. SERVICE

FOR THE ATTENTION OF SERVICE AND PARTS MANAGERS

DIFFICULT 1ST & 2ND SPEED GEAR ENGAGEMENT

The following modifications have recently been introduced to im ­prove gear engagement from stationary:

1. Commencin g at Engine No. 18Y/Ta/HI001~ new baulk rings having a radius on the cam faces .

2. Commencing at Engine No. 18Y/ Ta! H4844. new 1st and 2nd speed fori< providing a smoother and more positive action.

Old Part No.

88G 398

22H 617

D escription

Ring - baulk

Fork - 1st and 2nd speed

Qty. New Part No .

4 22H 1028

1 22H 10 23

The modified parts should be used for all Service replacements.

SERVICE DIVISION

C 26i67

Exo. ' 0 -F . O. 9

P . S. 21

12 . 6.67

bv

AUSTIN 1800

THE BRITISH MOTOR CORPORATION (AUSTRALIA) PTY. L IMITED ID 73

..

SERVICE -e:a11ei:".:i.:R1

FOR THE ATTENTION OF SERVICE AND PARTS MANAGERS

NON-INTERCHANGEABILITY OF GEARBOX GEARS

The following parts, (refer chart overleaf) if manufactured in Aust ­ralia , CANNOT be used in conjunction with gears manufactured in Englan d or vice versa.

English gears are stamped with I!MOWOG" only. whereas Australian gea rs are stamped with "MOWOC" over the map of Australia or "MOWOG - A".

1 st speed gear used in assembly Part No . 48G 422 has no stamping. however the country of manufacture can be ascertained by referring to illustrations 'A' a nd 'B' , and the stamping on the front face of 2nd speed synchro:

C28/6 -7 -

Exp. 20

F. o. 10 f-::-::---­

P. S. 24

5. 8. 67 '-:- .

Sighted by

'B' SERIES

GEARBOX

Australian 1 st. Speed Gear Note internal tooth formation causing serra ted appearance on top face.

English 1st. Speed Gear

'A'

Note top face of full width without in­terference by internal tooth formation .

'B'

This Technical Bulletin will supersede Service Bulletin ell6 dated 19.8.60.

Page 1 of 2

C28/67

U.K. AUST. Position of Part No. Part No. Description Ori gin Starn ping Remarks

22 H 54 llG'3024A Laygear Rear face of low gear.

22H 931 Laygear Rear face of low gear. MGB (all models) only

48G 438 Synchronizer Assy. 3rd Synchro - front face MGB (all models) only & 4th speed (with coupling) Coupling -next to

selector recess. . IG3611E IG 3611A Shaft - 15t motion To the rear of the splines.

22H 56 Shaft - 1 s t motion To the rear of the s plines. MGB 3 main bearing only.

22H 842 Shaft-I 5t motion , To the rear of th e splines. MGB 5 main bearing only.

22H 230 Gear - 2nd speed Front face Molybdenum coated synchro.

I G 3594E 22B 45 Gear - 3rd speed Front face

IG 3598E IG 3598A Coupling Sliding - 3rd Next to selector recess. & 4th speed gears

IG 3597E IG 3597A Synchro -3rd & 4th Front face speed

48G 422 1 st speed gear & 2nd No stamping - refer speed Synchro Assy. i llu strations.

I

SERVICE DIVISION THE BRITISH MOTOR CORPORATION (AlJSTRALIA) PTY. LIMIT ED

Page 2 of 2 C1l6

FOR THE ATTENTION OF SERVICE AND PARTS MANAGERS

MODIFIED FIRST MOTION SHAFT

At engine numbers saloon 18Y/Ta/H 14387 and utility 18YC/Ta/ H 1692 a new roller bearing was introduced together with a modified first motion shaft, drive gear, flywheel housing and adaptor plate .

The first motion shaft has been redesigned and the roller bearing (refe r drawing F2 Au stin 1800 Workshop Manual), has been trans ­ferred from the drive gear to th e first motion shaft. Othe r com ­ponents have been alt ered to suit this design change. refe r sketch overleaf. Figures (27) Collar for first motion shaft (26) Smaller d ia met e r (-0.060 in.) roller bearing (23) Modified drive gear (22) New first mot ion shaft nut.

SUMMARY OF PART CHANGE,S

Old Part No.

22H 116 9

Desc r iption

Fir st motion shaft Collar first motion shaft Drive gear - first m otion shaft Roller bearing Nut - first motion shaft Flywheel housing

New P art No.

22H 1137 22H 303 22H 1142 22H 958 22H 1026 Adaptor pl ate - flywheel housing

22H 1250 22H 124 7 22 H 124 9 22H 1255 22H 124 8 22 H 1271 22H 1253

PARTS ARE NOT INTERCHANGEABLE.

ALTERATIONS TO WORKSHOP MANUAL PROCEDURE Dismantle as Section F1 - Remove the clutch housing. R emove the bea rin g from the iirst motion shaft with a bearing race puller. '

Reassemble as Sect ion Fl - Replace the colla r on the first motion , s haft. Drift the bearing on to the first m otion shaft with the lip of the oute r r ace facing inward. Check that the outer r ace stands proud of the inner race by at least O. 010 in. r efer inset tAt sketch over ­leaf.

© All copyright re .erved In 'hl$ TeChnlcBI Bulletin by The Brl. l.h Mo.o r Corpore t ion iAuHralial P , y . LimiTed 1968

G, 7

fJ::3J!/JiIL rfu'P~ 38

F.O.

P. S. 16

21.8.68

~gh!ed_by

AUSTIN 1800

MANUAL

P age 1 of 2

C48/68 FLYWHEEL HOUSING & PRlMARY DRIVE GEARS

s . 7 6 I . /

9

II=~D 12

13---___ #J~~

/J---:;O

27 SERVICE DIVISION

THE BRITISH MOTOR CORPORATION (AUSTRALL~) PTY. LIMITED Pa ge 2 of 2 SFL

,

GEARBOX Jumping out of gears Gear engagement Non interchangeability Modified 1 st motion shaft Alterations to workshop manual

G l ' G2 G3 G5

SERVICE

FOR THE ATTENTION OF SERVICE AND PARTS MANAGERS

AUTO-DISENGAGEMENT OF 1 st AND 2nd GEARS

To eliminate this possibility. a synchroniser assembly with coupling sleeve incorporating 'in-gear' grooves for 1st and 2nd gears was introduced at Engine Nos. 18 AMW-U-H 42550 and 18 AMW-U-L 20593 .

SUMMARY OF PARTS CHANGES

Old P art No. 22H 896

Description Synchroniser assembly -15t and 2nd speed .

SERV ICE DIVISION

New Part No. 22H 989

1-':>lJ>1ll.e<L..D.Y:

AUSTIN 1800

THE BRITISH MOTOR CORPORATION(AUSTRALIAj PTY. LIMITED

!D 50

·ree .... · ....... ica.1

El C-.r:a.11eti:n.. SERVICE

FOR THE ATTENTION OF SERVICE AND PARTS MANAGERS

DIFFICULT 1ST & 2ND SPEED GEAR ENGAGEMENT

The following modifications have recently been introduced to im ­prove gear engagement from stationary:

1. Commencin g at Engine No. 18Y/Ta/HI001~ new baulk rings having a radius on the cam faces .

2. Commencing at Engine No. 18Y/ Ta! H4844. new 1st and 2nd speed fori< providing a smoother and more positive action.

Old Part No.

88G 398

22H 617

D escription

Ring - baulk

Fork - 1st and 2nd speed

Qty. New Part No .

4 22H 1028

1 22H 10 23

The modified parts should be used for all Service replacements.

SERVICE DIVISION

C 26i67

Exo. ' 0 -F . O. 9

P . S. 21

12 . 6.67

bv

AUSTIN 1800

THE BRITISH MOTOR CORPORATION (AUSTRALIA) PTY. L IMITED ID 73

..

SERVICE -e:a11ei:".:i.:R1

FOR THE ATTENTION OF SERVICE AND PARTS MANAGERS

NON-INTERCHANGEABILITY OF GEARBOX GEARS

The following parts, (refer chart overleaf) if manufactured in Aust ­ralia , CANNOT be used in conjunction with gears manufactured in Englan d or vice versa.

English gears are stamped with I!MOWOG" only. whereas Australian gea rs are stamped with "MOWOC" over the map of Australia or "MOWOG - A".

1 st speed gear used in assembly Part No . 48G 422 has no stamping. however the country of manufacture can be ascertained by referring to illustrations 'A' a nd 'B' , and the stamping on the front face of 2nd speed synchro:

C28/6 -7 -

Exp. 20

F. o. 10 f-::-::---­

P. S. 24

5. 8. 67 '-:- .

Sighted by

'B' SERIES

GEARBOX

Australian 1 st. Speed Gear Note internal tooth formation causing serra ted appearance on top face.

English 1st. Speed Gear

'A'

Note top face of full width without in­terference by internal tooth formation .

'B'

This Technical Bulletin will supersede Service Bulletin ell6 dated 19.8.60.

Page 1 of 2

C28/67

U.K. AUST. Position of Part No. Part No. Description Ori gin Starn ping Remarks

22 H 54 llG'3024A Laygear Rear face of low gear.

22H 931 Laygear Rear face of low gear. MGB (all models) only

48G 438 Synchronizer Assy. 3rd Synchro - front face MGB (all models) only & 4th speed (with coupling) Coupling -next to

selector recess. . IG3611E IG 3611A Shaft - 15t motion To the rear of the splines.

22H 56 Shaft - 1 s t motion To the rear of the s plines. MGB 3 main bearing only.

22H 842 Shaft-I 5t motion , To the rear of th e splines. MGB 5 main bearing only.

22H 230 Gear - 2nd speed Front face Molybdenum coated synchro.

I G 3594E 22B 45 Gear - 3rd speed Front face

IG 3598E IG 3598A Coupling Sliding - 3rd Next to selector recess. & 4th speed gears

IG 3597E IG 3597A Synchro -3rd & 4th Front face speed

48G 422 1 st speed gear & 2nd No stamping - refer speed Synchro Assy. i llu strations.

I

SERVICE DIVISION THE BRITISH MOTOR CORPORATION (AlJSTRALIA) PTY. LIMIT ED

Page 2 of 2 C1l6

FOR THE ATTENTION OF SERVICE AND PARTS MANAGERS

MODIFIED FIRST MOTION SHAFT

At engine numbers saloon 18Y/Ta/H 14387 and utility 18YC/Ta/ H 1692 a new roller bearing was introduced together with a modified first motion shaft, drive gear, flywheel housing and adaptor plate .

The first motion shaft has been redesigned and the roller bearing (refe r drawing F2 Au stin 1800 Workshop Manual), has been trans ­ferred from the drive gear to th e first motion shaft. Othe r com ­ponents have been alt ered to suit this design change. refe r sketch overleaf. Figures (27) Collar for first motion shaft (26) Smaller d ia met e r (-0.060 in.) roller bearing (23) Modified drive gear (22) New first mot ion shaft nut.

SUMMARY OF PART CHANGE,S

Old Part No.

22H 116 9

Desc r iption

Fir st motion shaft Collar first motion shaft Drive gear - first m otion shaft Roller bearing Nut - first motion shaft Flywheel housing

New P art No.

22H 1137 22H 303 22H 1142 22H 958 22H 1026 Adaptor pl ate - flywheel housing

22H 1250 22H 124 7 22 H 124 9 22H 1255 22H 124 8 22 H 1271 22H 1253

PARTS ARE NOT INTERCHANGEABLE.

ALTERATIONS TO WORKSHOP MANUAL PROCEDURE Dismantle as Section F1 - Remove the clutch housing. R emove the bea rin g from the iirst motion shaft with a bearing race puller. '

Reassemble as Sect ion Fl - Replace the colla r on the first motion , s haft. Drift the bearing on to the first m otion shaft with the lip of the oute r r ace facing inward. Check that the outer r ace stands proud of the inner race by at least O. 010 in. r efer inset tAt sketch over ­leaf.

© All copyright re .erved In 'hl$ TeChnlcBI Bulletin by The Brl. l.h Mo.o r Corpore t ion iAuHralial P , y . LimiTed 1968

G, 7

fJ::3J!/JiIL rfu'P~ 38

F.O.

P. S. 16

21.8.68

~gh!ed_by

AUSTIN 1800

MANUAL

P age 1 of 2

C48/68 FLYWHEEL HOUSING & PRlMARY DRIVE GEARS

s . 7 6 I . /

9

II=~D 12

13---___ #J~~

/J---:;O

27 SERVICE DIVISION

THE BRITISH MOTOR CORPORATION (AUSTRALL~) PTY. LIMITED Pa ge 2 of 2 SFL