Emission controls - engine breathing 1969 on : Somerford Mini

HS Type Carburetter Crankcase Ventilation
1969-92
In 1969, upon the advent of the Mini Mk III, the engine breathing system was greatly simplified - for the most part. 848, 998, 1098 and 1275cc (Cooper S) models used a hose running between the oil separator on the tappet chest cover and a boss on the carburetter (or carburetters, in the case of the Cooper S).

The 1275 GT also started off with a single separator to carburetter hose, but since unlike the Cooper S the 1275 GT didn't have tappet chest covers, the oil separator was mounted on the flywheel housing. A second separator on the timing cover at the other end of the engine was added in 1971; from that point onwards each separator had its own hose connecting to a Y piece, with a further short hose connecting the Y piece to the carburetter.

848cc, 998cc and 1098cc, 1969-92
Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
1	12A1212	COVER, tappet chest, LH, with oil separator	1
2	GUG705505GM	GASKET, cover, rubber	1
3	BH605101	SCREW, cover to block	1
4	12A1177	WASHER, cup	1
5	12A1176	BUSH, rubber	1
6	MRC1980A	BUSH, rubber	1	1985-92; replaces 12A1176 and 12A1177.
7	12A1735	HOSE, oil separator to carburetter	1
8	GHC507	CLIP, hose to oil separator	1
9	ACH5854	CLIP, hose to carburetter	1

1275cc (Cooper S), 1969-71
Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
10	12A1212	COVER, tappet chest, LH, with oil separator	1
11	GUG705505GM	GASKET, cover, rubber	1
12	BH605101	SCREW, cover to block	1
13	12A1177	WASHER, cup	1
14	12A1176	BUSH, rubber	1
15	MRC1980A	BUSH, rubber	1	Later design; replaces 12A1176 and 12A1177.
16	12G2130	HOSE, oil separator to Y piece	1
17	12G2134	Y PIECE	1
18	12G2126	HOSE, Y piece to carburetter	2
19	12G1938	BREATHER, flywheel housing	1
20	GUG705551GM	GASKET, breather to flywheel housing	1
21	SH505061	SCREW, breather to flywheel housing	2
22	LWZ205	WASHER, locking	2
23	GHC507	CLIP, hose to Y piece	2
24	ACH5854	CLIP, hose to carburetter	4

1275cc (1275 GT), 1969-71
Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
25	12G2619	SEPARATOR, oil, engine rear	1
26	GUG705551GM	GASKET, separator to flywheel housing	1
27	SH505061	SCREW, separator to flywheel housing	2
28	LWZ205	WASHER, locking	2
29	12G2016	HOSE, oil separator to carburetter	1
30	GHC507	CLIP, hose to oil separator	1
31	ACH5854	CLIP, hose to carburetter	1

1275cc (1275 GT), 1971-80
Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
32	12G2619	SEPARATOR, oil, engine rear	1
33	GUG705551GM	GASKET, separator to flywheel housing	1
34	SH505061	SCREW, separator to flywheel housing	2
35	LWZ205	WASHER, locking	2
36	12G2507	COVER, duplex timing gear, with oil separator	1	1971-73.
	12G2623	COVER, simplex timing gear, with oil separator	1	1973-79; not A Plus engine.
	CAM4868	COVER, simplex timing gear, with oil separator	1	1979-80; A Plus engine.
37	12A1052	HOSE, rear oil separator to Y piece	1
38	12G2482	HOSE, timing cover oil separator to Y piece	1
39	12G2134	Y PIECE	1
40	12G2126	HOSE, Y piece to carburetter	1
41	GHC507	CLIP, hose to oil separator	4
42	ACH5854	CLIP, hose to carburetter	2

HIF Type Carburetter Crankcase Ventilation
1990-94
For the carburetter Cooper of 1990-91, a close approximation of the late 1275 GT system was used, with oil separators on the timing cover and flywheel housing together feeding crankcase fumes into the carburetter. A very similar system with detail changes was used on the 1275cc carburetter Mayfair and Sprite of 1992-94.
Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
43	LLC10047	SEPARATOR, oil, engine rear	1	Manual gearbox.
44	LLC10051	SEPARATOR, oil, engine rear	1	Automatic gearbox.
45	GUG705551GM	GASKET, separator to engine	1
46	SH505061	SCREW, separator to engine	2/1	Quantity decreases for 1992-94 Mayfair and Sprite.
47	LWZ205	WASHER, locking	2/1	Quantity decreases for 1992-94 Mayfair and Sprite.
48	TE505091	STUD, separator to engine	1	1992-94 Mayfair and Sprite.
49	FNZ105	NUT	1	1992-94 Mayfair and Sprite.
50	LWZ205	WASHER, locking	1	1992-94 Mayfair and Sprite.
51	CAM4868	COVER, timing gear, with oil separator	1	1990-91 Cooper.
	LJR10168	COVER, timing gear, with oil separator	1	1992-94 Mayfair and Sprite.
52	LLH10135	HOSE, rear oil separator to Y piece	1
53	12A1735	HOSE, timing cover oil separator to Y piece	1
54	12G2134	Y PIECE	1
55	LLH10112	HOSE, Y piece to carburetter	1	1990-91 Cooper.
56	LLH10112	HOSE, Y piece to T piece	1	1992-94 Mayfair and Sprite.
57	ADU6607	T PIECE	1	1992-94 Mayfair and Sprite.
58	MAH10076	HOSE, T piece to carburetter	1	1992-94 Mayfair and Sprite.
The other outlet from the ADU6607 T piece connects to the charcoal cannister hose; for more details, please see the 'Evaporative Loss Control' section.

Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
59	GHC507	CLIP, hose to oil separator/Y piece	A/R
60	ACH5854	CLIP, hose to carburetter	A/R

HIF 44 Carburetter Anti Run On Valve
An anti run on valve inherited from the MG Metro engine was fitted to the 1990-91 Coopers, being plumbed into the brake servo vacuum system via a T piece and specially moulded hoses.
Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
61	MAV10021	VALVE, anti run on	1
62	BAU4612	FILTER, valve	1	Included in anti run on valve.
63	ADU6607	T PIECE, servo hose	1
64	PHZ10007	HOSE, T piece to anti run on valve	1
65	PHZ10008	HOSE, T piece to manifold	1
66	SQC10011	HOSE, T piece to non return valve	1
	SQC10012	HOSE, non return valve to servo	1

Fuel Injection Crankcase Ventilation
1991 On
Fuel injected Minis took the oil separators from the previous HIF carburetter system and added a breather rail between them - other than that change, the principle is the same as before: the two separators feed crankcase fumes into the induction system. Single Point Injection (SPi) was used between 1991 and 1996; Multi Point Injection (MPi) replaced it from 1997 onwards, except for Japan which remained with SPi through to the end.
Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
67	LLC10047	SEPARATOR, oil, engine rear	1	Manual gearbox.
68	LLC10051	SEPARATOR, oil, engine rear	1	Automatic gearbox.
69	GUG705551GM	GASKET, separator to engine	1
70	SH505061	SCREW, separator to engine	1
71	LWZ205	WASHER, locking	1
72	TE505091	STUD, separator to engine	1
73	FNZ105	NUT	1
74	LWZ205	WASHER, locking	1
75	LJR10168	COVER, timing gear, with oil separator	1	1991-96, SPi.
	LJR103470	COVER, timing gear, with oil separator	1	1997 on, MPi. 1997 on, SPi (Japan).
76	LLP10026	RAIL, crankcase ventilation	1	1991-96, SPi. 1997 on, SPi (Japan).
	LLP100300	RAIL, crankcase ventilation	1	1997 on, MPi.
77	ADU6863	SCREW, rail to cylinder head	1
78	LLH10135	HOSE, rear oil separator to rail	1
79	LLH10132	HOSE, timing cover oil separator to rail	1
80	MAH10035	HOSE, purge valve to rail	1	1991-96, SPi. 1997 on, SPi (Japan).
	MAH101010	HOSE, purge valve to rail	1	1997 on, MPi.
81	LLH10130	HOSE, rail to throttle body	1	1991-96, SPi.
	LLH101830	HOSE, rail to throttle body	1	1997 on, SPi (Japan).
	LLH102240	HOSE, rail to throttle body	1	1997 on, MPi.
82	GHC507	CLIP, hose	A/R

Monday:	09.00am to 17.30pm
Tuesday:	09.00am to 17.30pm
Wednesday:	09.00am to 17.30pm
Thursday:	09.00am to 17.30pm
Friday:	09.00am to 17.30pm
Saturday:	09.00pm to 12.00pm

Emission controls - engine breathing 1969 on

HOSE-Y PIECE TO CARB.90-91-COOPER & Y PIECE TO T PIECE-92-94

HOSE-CRANKCASE BREATHER TO Y PIECE-'90-'94 & RAIL-'91 ON

STUD-5/16 UNF/UNC x 1 1/8''

OIL SEPARATOR-CRANKCASE-1275cc'90-'00 MANUAL MODELS

OIL SEPARATOR-CRANKCASE-1275cc MODELS-'90-'00-AUTOMATIC

USE: 12A1735

WHEN STOCK EXHAUSTED USE: 37H7615M x 0.30

USE: 37H7615M x .35

HOSE-BREATHER RAIL-TO INLET MANIFOLD-'97 ON JAP.& PURGE VALVE-91>

GASKET-BREATHER TO FLYWHEEL HOUSING

T PIECE- SERVO HOSE TO ANTI RUN ON VALVE-CARB COOPER '90-'91

USE: LLC10047

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