Emission controls - engine breathing 1959-69

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Part No: LWZ204
WASHER-SPRING, 1/4''
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Part No: SH604061
SET SCREW-1/4'' UNF x 3/4''
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Part No: LWZ205
WASHER-SPRING, 5/16''
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Part No: FNZ104
NUT - 1/4″ UNF
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NUT - 1/4" UNF
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Part No: FNZ105
NUT - 5/16″ UNF
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NUT - 5/16" UNF
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Part No: PWZ105
WASHER - PLAIN - 5/16″
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WASHER - PLAIN - 5/16"
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Part No: GHC507
CLIP-HOSE-WORM DRIVE 3/4'' (16-22mm)
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Part No: 1B3664
WASHER-FIBRE-5/8'' INTERNAL DIAMETER
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Part No: 12A1139
USE: 12A1175
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Part No: 12A1176
SEAL-CONCAVE TAPPET CHEST COVER BOLT
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SEAL-CONCAVE TAPPET CHEST COVER BOLT
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Part No: 12A1177
WASHER-CUP-CONCAVE TAPPET CHEST COVERS
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WASHER-CUP-CONCAVE TAPPET CHEST COVERS
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Part No: 12A1212
COVER-CONCAVE-TAPPET CHEST-LH WITH OIL SEPARATOR-'64-'92
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Part No: 12G577
COVER-CONVEX-TAPPET CHEST-LH WITH OIL SEPERATOR-'64-'69
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Part No: 2K4458
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Part No: BH605151
BOLT-5/16'' UNF x 1 7/8''
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BOLT-5/16'' UNF x 1 7/8''
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Part No: GUG705505GM
GASKET-TAPPET CHEST COVER-RUBBER
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GASKET-TAPPET CHEST COVER-RUBBER
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Part No: MRC1980A
SEAL-TAPPET CHEST COVER-REPLACES 12A1177 & 12A1176
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SEAL-TAPPET CHEST COVER-REPLACES 12A1177 & 12A1176
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Part No: SH605091
SET SCREW-5/16 UNF x 1 1/8''
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SET SCREW-5/16 UNF x 1 1/8''
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Part No: SH504051
SET SCREW- 1/4 UNC x 5/8''
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SET SCREW- 1/4 UNC x 5/8''
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Part No: 149342
PLUNGER-PCV VALVE
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PLUNGER-PCV VALVE
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Part No: 517582
SERVICE KIT-PCV VALVE
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Part No: 12A1052
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Part No: 12A1171
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Part No: 12A1345
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Part No: 12A1382
COVER-CONVEX-TAPPET CHEST-LH WITH ELBOW'59-'69 NOT 997cc
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Part No: 12A396
PIPE-STEEL,VENT TAPPET CHEST COVER-997cc
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Part No: 12G1223
BRACKET-PCV VALVE TO THERMOSTAT HOUSING-AUTO.-'64-'69
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Part No: 12G154
PIPE-STEEL,VENT,TAPPET CHEST COVER-'59-'69-NOT 997cc
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Part No: 12G280
COVER-CONVEX-TAPPET CHEST-LH-WITH SWAN NECK PIPE-'59-'64
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Part No: 12G609
BRACKET-PCV VALVE TO MANIFOLD-MANUAL-'64-'69
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BRACKET-PCV VALVE TO MANIFOLD-MANUAL-'64-'69
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Part No: 12G610
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Part No: 12H1405
ADAPTOR-MANIFOLD-ACCEPTS SERVO HOSE ETC
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ADAPTOR-MANIFOLD-ACCEPTS SERVO HOSE ETC
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Part No: 12H1407
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Part No: 12H948
COVER-CONVEX-TAPPET CHEST-LH-WITH ELBOW PIPE-'59-'64
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Part No: 12H950
COVER-CONVEX-TAPPET CHEST-LH WITH SHORT ELBOW PIPE-997cc
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Part No: 13H5191
VALVE-PCV- EMMISSION CONTROL- TWIN CARB
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VALVE-PCV- EMMISSION CONTROL- TWIN CARB
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Part No: 27H7756
SPRING-PCV VALVE
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SPRING-PCV VALVE
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Part No: 27H7758
DIAPHRAGM-PCV VALVE
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DIAPHRAGM-PCV VALVE
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Part No: 27H7759
COVER-PCV VALVE
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COVER-PCV VALVE
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Part No: 27H7760
CLIP-COVER-PCV VALVE
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CLIP-COVER-PCV VALVE
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Part No: 37H3718
HOSE- ROCKER COVER TO AIR FILTER '59-'69
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HOSE- ROCKER COVER TO AIR FILTER '59-'69
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Part No: ACA5290
CLIP-SPRUNG WIRE TYPE-AIR CLEANER BREATHER HOSE
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CLIP-SPRUNG WIRE TYPE-AIR CLEANER BREATHER HOSE
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Part No: CHS2409
STUD-1/4 UNF/UNC x 1 1/8''
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STUD-1/4 UNF/UNC x 1 1/8''
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Open Crankcase Ventilation
1959-69
Open crankcase ventilation involved a pipe venting to atmosphere from the left hand tappet chest cover (of which there were several designs, only some of which are listed here, ending up with a compact, swan-necked pipe type), plus a hose running from the rocker cover to the air filter. Open crankcase ventilation was replaced in 1964 by positive crankcase ventilation in all but a very small number of Cooper and Cooper S models. However, the vast majority of single carburetter standard tune Minis built between 1964 and 1969 retained open crankcase ventilation.
         
848cc, 1959-64
Ill. No. Part No. Description Qty. Rqd. Remarks
1 37H3718 HOSE, rocker cover to air cleaner 1 Sold per metre.
2 ACA5290 CLIP, hose 2  
3 12H948 COVER, tappet chest, LH, with early elbow pipe 1 Convex type cover.
4 12G280 COVER, tappet chest, LH, with late swan-neck pipe 1 Convex type cover.
5 12A1171 COVER, tappet chest, LH, with late elbow pipe 1 Concave type cover.
6 12A1139 GASKET, cover, cork 1 For convex type cover.
7 BH605151 BOLT, cover to block 1 For convex type cover.
8 2K4458 WASHER, bolt 1 For convex type cover.
9 GUG705505GM GASKET, cover, rubber 1 For concave type cover.
10 SH605091 SCREW, cover to block 1 For concave type cover.
11 12A1177 WASHER, cup 1 For concave type cover.
12 12A1176 BUSH, rubber 1 For concave type cover.
13 MRC1980A BUSH, rubber 1 Later design; replaces 12A1176 and 12A1177.
         
997cc, 998cc, 1071cc, 1275cc, 970cc, 1961-64
Ill. No. Part No. Description Qty. Rqd. Remarks
14 37H3718 HOSE, rocker cover to air cleaner 1 Sold per metre.
15 ACA5290 CLIP, hose 2  
16 12H950 COVER, tappet chest, LH, with short elbow pipe 1 997cc; convex type cover.
17 12G280 COVER, tappet chest, LH, with late swan-neck pipe 1 Not 997cc; convex type cover.
18 12A1382 COVER, tappet chest, LH, with elbow pipe 1 Not 997cc; concave type cover.
19 12A396 PIPE, vent 1 997cc.
20 12G154 PIPE, vent 1 Not 997cc.
21 12A1139 GASKET, cover, cork 1 For convex type cover.
22 BH605151 BOLT, cover to block 1 For convex type cover.
23 2K4458 WASHER, bolt 1 For convex type cover.
24 GUG705505GM GASKET, cover, rubber 1 For concave type cover.
25 SH605091 SCREW, cover to block 1 For concave type cover.
26 12A1177 WASHER, cup 1 For concave type cover.
27 12A1176 BUSH, rubber 1 For concave type cover.
28 MRC1980A BUSH, rubber 1 Later design; replaces 12A1176 and 12A1177.
29 FNZ105 NUT, pipe and fuel pump blanking plate to block 1  
30 LWZ205 WASHER, locking 1  
31 PWZ105 WASHER, plain 1  
         
All Engine Sizes, 1964-69
Ill. No. Part No. Description Qty. Rqd. Remarks
32 37H3718 HOSE, rocker cover to air cleaner 1 Sold per metre.
33 ACA5290 CLIP, hose 2  
34 12A1382 COVER, tappet chest, LH, with elbow pipe 1 May be used on earlier models so long as correct gasket and fixings are also used.
35 12G154 PIPE, vent 1  
36 GUG705505GM GASKET, cover, rubber 1  
37 SH605091 SCREW, cover to block 1  
38 12A1177 WASHER, cup 1  
39 12A1176 BUSH, rubber 1  
40 MRC1980A BUSH, rubber 1 Later design; replaces 12A1176 and 12A1177.
41 FNZ105 NUT, pipe and fuel pump blanking plate to block 1  
42 LWZ205 WASHER, locking 1  
43 PWZ105 WASHER, plain 1  
         
Positive Crankcase Ventilation
1964-69
Positive crankcase ventilation (PCV) was fitted on relatively few standard tune, single carburetter Minis between 1964 and 1969 - in fact, probably only those destined for emissions-conscious export markets. By contrast, virtually all of the 1964-69 twin carburetter Cooper and Cooper S models were PCV fitted.
         
The PCV system is easily recognised by the mushroom shaped PCV valve positioned above and attached to the inlet manifold. The system was also known in some factory publications as closed circuit engine breathing. Instead of venting to atmosphere as in open crankcase ventilation, the fumes passed from the tappet chest cover through an oil separator (trap) and then via the PCV valve into the inlet manifold. The rocker cover to air filter hose of open crankcase breathing was not used on PCV fitted models.
Ill. No. Part No. Description Qty. Rqd. Remarks
44 13H5191 VALVE ASSEMBLY, PCV 1  
45 27H7760 CLIP, cover 1 Included in valve assembly.
46 27H7756 SPRING 1 Included in valve assembly.
47 517582 SERVICE KIT, valve 1 Included in valve assembly.
48 149342 PLUNGER 1 Included in service kit.
49 27H7758 DIAPHRAGM 1 Included in service kit.
50 27H7759 COVER 1 Included in service kit.
51 SH604061 SCREW, valve to bracket 1  
52 FNZ104 NUT 1  
53 LWZ204 WASHER, locking 1  
54 12H1405 ADAPTOR, manifold 1  
55 1B3664 WASHER, sealing 1  
56 12G577 COVER, tappet chest, LH, with oil separator 1 Convex type cover.
57 12A1212 COVER, tappet chest, LH, with oil separator 1 Concave type cover.
58 12A1139 GASKET, cover, cork 1 For convex type cover.
59 BH605151 BOLT, cover to block 1 For convex type cover.
60 2K4458 WASHER, bolt 1 For convex type cover.
61 GUG705505GM GASKET, cover, rubber 1 For concave type cover.
62 SH605091 SCREW, cover to block 1 For concave type cover.
63 12A1177 WASHER, cup 1 For concave type cover.
64 12A1176 BUSH, rubber 1 For concave type cover.
65 MRC1980A BUSH, rubber 1 Later design; replaces 12A1176 and 12A1177.
         
Manual Gearbox
Ill. No. Part No. Description Qty. Rqd. Remarks
66 12G609 BRACKET, valve to manifold 1  
67 CHS2409 STUD, bracket to manifold 1 Early models.
68 FNZ104 NUT 1 Early models.
69 LWZ204 WASHER, locking 1 Early models.
70 SH504051 SCREW, bracket to manifold 1 Later models.
71 LWZ204 WASHER, locking 1 Later models.
72 12H1407 HOSE, valve to manifold 1  
73 12A1052 HOSE, oil separator to valve 1  
74 GHC507 CLIP, hose 4  
         
Automatic Gearbox
Ill. No. Part No. Description Qty. Rqd. Remarks
75 12G1223 BRACKET, valve to thermostat housing 1  
76 FNZ105 NUT, bracket to thermostat housing 1  
77 LWZ205 WASHER, locking 1  
78 12A1345 HOSE, valve to manifold 1  
79 12G610 HOSE, oil separator to valve 1  
80 GHC507 CLIP, hose 4  
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Part No: 12G610
USE: BH002 x .2 METRE
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Part No: 12G609
BRACKET-PCV VALVE TO MANIFOLD-MANUAL-'64-'69
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BRACKET-PCV VALVE TO MANIFOLD-MANUAL-'64-'69

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Part No: 12G280
COVER-CONVEX-TAPPET CHEST-LH-WITH SWAN NECK PIPE-'59-'64
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Part No: 12G154
PIPE-STEEL,VENT,TAPPET CHEST COVER-'59-'69-NOT 997cc
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PIPE-STEEL,VENT,TAPPET CHEST COVER-'59-'69-NOT 997cc

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Part No: 12G1223
BRACKET-PCV VALVE TO THERMOSTAT HOUSING-AUTO.-'64-'69
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Part No: 12A396
PIPE-STEEL,VENT TAPPET CHEST COVER-997cc
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Part No: 12A1382
COVER-CONVEX-TAPPET CHEST-LH WITH ELBOW'59-'69 NOT 997cc
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Part No: 12A1345
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Part No: 12A1171
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Part No: 517582
SERVICE KIT-PCV VALVE
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Part No: 149342
PLUNGER-PCV VALVE
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PLUNGER-PCV VALVE

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