Emission controls - engine breathing 1969 on

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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  
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