Engine External


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	G232B	290-000	290-000	1	1	1	Top
	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
15	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
23	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

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 “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 reproducedanywhere or in any form without the author's express, personal consent.