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Ref #

Description

* = suitable for unleaded head

Original Equipment MG Part Number

NTG

Part Number

Moss Europe Part Number
Moss USA Part Number
Amount Required
YA
YT
YB
 

1

Rocker Cover - Original Steel

MG900/8

B152A

224-245

-

1

1

1

Top

Valve Instruction Plate

MG706/441

-

408-735

408-735

1

1

1

Top

Rivet for Plate

MG679/26

-

-

-

2

2

2

Top

2

Gasket - Rocker Cover

MG862/217

G211

290-300

290-300

1

1

1

Top

3

Oil Filler Cap - Rocker Cover

X24439

B588

433-490

433-490

1

1

1

Top

4

Cylinder Head Studded with Guides

MG900/6

-

-

-

1

1

1

Top

5

Gasket - Cylinder Head

- see footnote.

1250cc Y, Y/T YB to engine block number 17462

MG862/454

G232B

290-000

290-000

1

1

1

Top

1250cc YB from engine block number 17463 to 17993

X.24481

1250cc YB from engine block number 17994 to end

168423

G232C

290-100

290-100

-

-

1

Top

6

Stud - Rocker Cover - Head

MG862/181

B524B

328-770

328-770

2

2

2

Top

7

Fiber Washer - Rocker Cover

MG862/123

B524C

324-610

324-610

2

2

2

Top

8

Knurled Nut - Rocker Cover

MG862/218

B524

433-560

433-560

2

2

2

Top

9

Blanking Plate - Rear of Head

MG862/419

B589

433-310

433-310

1

1

1

Top

10

Gasket (Cork) Rear of Head.

MG900/168

G212

290-800

290-800

1

1

1

Top

11

Screw For Rear Cover-Plate

MG862/211

B530

323-180

323-180

4

4

4

Top

12

Water Outlet Pipe - Studded

MG900/7

B310A

434-140

434-140

1

1

1

Top

13

Gasket for Outlet Pipe

MG862/214

G213

290-700

290-700

1

1

1

Top

14

Stud for Thermostat

X151/45

B341

328-747

328-730

2

2

2

Top

Nut for Thermostat Stud

X151/16

B194A

311-100

311-100

2

2

2

Top

Spring washer for Thermostat Stud

X151/15

-

-

-

2

2

2

Top

15

Bolt for Water Outlet Pipe

X151/30

B244

320-290

320-625

 

 

 

Top

Spring washer for Water Outlet Pipe

X151/15

-

-

324-030

4

4

4

Top

16

Breather Pipe Hose

MG900/102

-

-

-

1

-

1

Top

17

Clip for Breather Hose

MG900/103

-

326-260

326-260

2

2

2

Top

18

Air Cleaner

A1312

A574H

-

-

1

-

1

Top

19

Bracket (Cleaner to Cover)

A1199

B110

-

-

2

-

2

Top

20

Pipe to Air Cleaner

MG900/245

A569H

-

-

1

-

1

Top

Pipe to Air Cleaner

A569C/D

A569C/

A569D

373-335

373-335

-

1

-

Top

Bolt (Pipe to Carburettor)

X151/30

B011C

320-290

320-625

2

4

2

Top

Spring Washer

X151/15

-

-

-

2

4

2

Top

21

Gasket (Pipe to Carburettor)

MG862/102

G855

294-600

294-600

1

2

1

Top

22

Bracket (Cleaner to Cover)

MG900/246

A570J

370-918?

370-918?

2

-

2

Top

23

Bolt (Bracket to Cover)

P151/331

-

-

-

2

-

2

Top

Washer (Bracket to Cover)

MG862/123

-

-

-

2

-

2

Top

24

Exhaust and Inlet Manifold

MG900/28

B240A

-

-

1

-

1

Top

Exhaust Manifold

 

B240

454-305

454-305

-

1

-

Top

Inlet Manifold

 

B011

-

-

-

1

-

Top

25

Bolt to Manifold

MG862/334

B011C

-

-

2

4

2

Top

26

Gasket to Manifold

MG706/111

G856

1G2624

294-500

1

2

1

Top

27

Gasket to Manifold

MG862/221

G131A

290-400

290-400

1

1

1

Top

28

Clamp for Manifold

MG900/145

B195

433-630

433-630

4

4

4

Top

29

Nut for Clamp

X151/16

B194A

311-100

311-100

4

4

4

Top

30

Stud for Flanges (Exhaust pipe to header)

MG900/11

B194

328-760

328-760

3

3

3

Top

31

Spring Washer for Stud (Exhaust pipe to header)

X151/28

-

-

-

3

3

3

Top

32

Nut for Stud (Exhaust pipe to header)

X679/58

B242

311-768

 set

311-768

 set

3

3

3

Top

33

Stud for Manifold

MG900/107

B241

328-760

328-760

4

4

4

Top

34

Bracket for control link on frame

S44/205

B495B

411-060

411-060

1

1

1

Top

35

Stud for cylinder head

MG679/116

B340

328-780

328-780

10

10

10

Top

36

Nut for securing cylinder head

MG679/207

B346

311-200

311-200

10

10

10

Top

37

Cup for link

S44/203

D564

324-988

 set

324-988

 set

4

4

4

Top

38

Rubber for control link

S75/50

R079

281-158

 set

281-158

 set

4

4

4

Top

39

Engine control link (R.H. Thread)

S89/35

B495

411-050

411-050

1

1

1

Top

40

Adjuster

S105/9

B495

1

1

1

Top

41

Engine control link (L.H. Thread)

S89/36

B495

1

1

1

Top

42

Bracket for engine control link

S44/204

B495A

411-040

411-040

1

1

1

Top

43

Hose for air cleaner

MG900/247

A570G

-

-

1

1

1

Top

44

Washer for screw

MG679/546

G396

324-760

324-760

2

2

2

Top

45

Screw (banjo to head)

MG795/194

B583

435-465

round

435-490

hexagon

435-465

round

435-490

hexagon

1

 

 

 

1

 

 

 

 

 

1

 

Top

46

Oil pipe (gallery to head)

MG900/12

B852

435-510

435-510

1

1

1

Top

 

Gasket - Cylinder Head.

XPAG/SC2/17463 (22nd July 1952 - in Car No. YB/0614)

This was the first “group 3” engine, and it introduced a new cylinder block (only), Part No. SA.2404/11, “casting no.” 168421, with new round water circulat­ing holes (as opposed to the pear shaped holes in ear­lier blocks), and a new cylinder head gasket, Part No. X.24481, with pear shaped water holes and a large rear water hole.

The background to this change was as follows:

The “TD Mark II” Midget was by this time being fitted with a cylinder block and cylinder head incorporat­ing revised water circulating holes, ostensibly to improve circulation and cooling. (These engines were designated “XPAG/TD3/” units.) Standard engines for the normal “TD”, and also for the “YB”, would in due course be changed accordingly (no doubt when supplies of the earlier units were used up! Presumably supplies of the block were used up first, because the new cylinder head with round water holes was in both cases (“TD” and “YB”) intro­duced later, (at XPAG/SC2/17994 in the case of the ‘YB”)).

Great care is needed with regard to which cylinder head gasket should be used in any given situation. On earlier engines (prior to XPAG/SC2/17463), the stan­dard gasket (Part No. MG.862/45) had pear shaped water holes and a small rear water hole. The intro­duction of the new block, SA.2404/11 (only), required the use of a cylinder head gasket with pear shaped holes, and a large rear water hole (Part No. X.24481). The earlier gasket was discontinued, and gasket no. X.24481 must be used whenever a new type block is fitted with an old type cylinder head, or vice versa. It can also be used for servicing earlier engines.

NB.1. When the new type block is used with the new type cylinder head, Part No. SA.2203/10, an even newer gasket, Part No. 168423, MUST be used. This has round water holes, and a large rear water hole with a reinforcing bar across the centre. (See under XPAG/SC2/17994.)

NB.2. This new cylinder block retained the machined “pad” that, on earlier blocks, was necessary for mounting the early type oil filter support bracket. The machined “pad” was the larger one that was employed on blocks with the “casting number” 24445, but on these later blocks, the three bolt holes were not provided. Likewise, the rear inlet to the oil gallery was undrilled.

NB.3. This new block did not have the “MG-in-an-octagon” badge cast into the left hand side. However, it did incorporate a small “W-in-a-diamond” motif (see Para. 9a. this chapter for details).

This entire footnote is provided courtesy of David Lawrence and is produced here by kind permission from his book "Let there be Ys". Neither this footnote, nor any other portion of the book, or its supplements can be reproduced anywhere or in any form without the author's express, personal consent.

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