Somerford Mini Ltd. Ordering Parts Using This Catalogue

Cylinder Head - 1275cc (Not Cooper S)
No. Part No. Description Qty. Remarks No. Part No. Description Qty. Remarks
Combined Inlet and Exhaust Manifold Fixings
1275 GT 1969-80 and 1275cc Carburetter Models 1992-94
30 GUG704053MG GASKET, manifold, standard 1
31 53K487 STUD, manifold 6 1969-80.
LYR10028 STUD, manifold 6 1992-94.
32 12A1211 WASHER, plain, large, clamping manifold 4
33 PWZ105 WASHER, plain 2
34 GHF261 NUT, brass, manifold to cylinder head 6
51K1177 NUT, brass, manifold to cylinder head,long 6 Alternative; easier to access .
FNZ105 NUT, steel 6 Alternative.
Separate Inlet and Exhaust Manifold Fixings
Cooper Carburetter 1990-91
35 GUG704053MG GASKET, manifold, standard 1
36 53K487 STUD, manifold 6
37 PWZ105 WASHER, plain 6
38 GHF261 NUT, brass, manifolds to cylinder head 6
Separate Inlet and Exhaust Manifold Fixings
Injection Models 1991 On
39 GUG704063MG GASKET, manifold, reinforced 1
40 LYR10028 STUD, manifold 6 1991-96 single point injection.
53K487 STUD, manifold, outer 2 1997 on multi and single point injection.
LYR10028 STUD, manifold, inner 4 1997 on multi and single point injection.
41 PWZ105 WASHER, plain 2
42 GHF261 NUT, brass, manifolds to head 2
43 LYH10008 NUT AND WASHER,manifolds to head 4
Rocker Cover and Fixings
44 12A1530 ROCKER COVER, steel, black 1 1969-80.
LDR10074 ROCKER COVER, steel, black 1 1990 on.
LDR103490 ROCKER COVER, steel, citrus green 1 1998 P aul Smith limited edition.
45 CAM6822 ROCKER COVER, alloy 1 Accessory (also MG Metro) item.
A range of polished or painted alloy accessory rocker covers is available from Somerford Mini; please
contact us for details. Some accessory rocker covers require different fixings from the standard items.
46 - DECAL, rocker cover 1 See note belo w.
For details of the large range of plates and decals fixed to rocker covers, please see the ‘Chassis Plates
and Decals’ section in the Interior Body Fittings area of the Somerford Mini catalogue.
47 13H2296 CAP, oil filler, black plastic, with breather 1
48 GFE6007 CAP, oil filler, red plastic, with breather 1 For CAM6822 alloy rocker cover.
49 12A403 SEAL, plastic oil filler cap 1 For 13H2296 cap.
50 GEG401 GASKET, rocker cover 1
51 CAM6822FK CHROME FIXINGS KIT, rocker cover 1
Includes chrome nuts, chrome distance pieces, chrome cup washers and rubber bushes. Originally for
alloy rocker covers such as CAM6822,may also be used to enhance restored steel rocker covers.
52 2A150 NUT, rocker cover to engine 2 Original zinc finish.
CAM6823 NUT, rocker cover to engine 2 Alternative chrome finish.
53 1B2925 DISTANCE PIECE 2 Original zinc finish.
12G687 DISTANCE PIECE 2 Alternative chrome finish.
54 1A2156 WASHER, cup 2 Original zinc finish.
12G679 WASHER, cup 2 Alternative chrome finish.
55 12A1358 BUSH, rubber 2
56 12H2557 NUT, extension, air intake to rocker cover 2 1990-91 carburetter models .
57 12A1968 LIFTING EYE, engine, temporary fitment 2 Fit only while lifting work is taking place.
Rocker Shaft, Rockers and Fixings
58 12G1926 PEDESTAL, rocker shaft, with oil hole 3
59 12G1927 PEDESTAL, rocker shaft, with tapped hole 1
60 2A258 SCREW, locating rocker shaft 1
61 2A515 PLATE, securing screw 1 1969-74.
62 2A259 PLATE, securing screw 1 1974 on; will fit 1969-74 models.
63 51K885 STUD, long, rocker cover and pedestal 2 Outer pedestals.
64 CHS522 STUD, short, rocker pedestal 2 Inner pedestals.
65 LNZ205 NUT, nyloc, pedestal to cylinder head 4 1969-80.
66 PWZ105 WASHER, plain (not on tapped pedestal) 3 1969-80.
67 PWZ106 WASHER, plain (not on tapped pedestal) 3 1969-80.
68 NH605040 NUT, pedestal to cylinder head 4 1990 on.
69 PWZ105 WASHER, plain (not on tapped pedestal) 3 1990 on.
70 AEG399 ROCKER SHAFT ASS’Y 1 1969-74.
71 12A1950 ROCKER SHAFT 1 1974 on; will fit 1969-74 models.
72 6K878 END PLUG , plain 1 Included in AEG399 rocker shaft ass’y.
73 2K4608 END PLUG, screwed 1 Included in AEG399 rocker shaft ass’y.
74 12G1313 ROCKER, pressed steel 8 First rocker type.
75 12G1221 ROCKER, forged 8 Second rocker type.
76 CAM289 ROCKER, scintered 8 Third rocker type, 1974 on.
Pressed steel rockers and the stronger for ged rockers were used in standard and high performance engines
as alternatives both in production and the parts department until 1974, when the scintered rocker was
introduced. The scintered rocker was used in all engine production from that time onwards, although the
pressed steel and forged types continued to be offered as alternative spare par ts for earlier cars. For
normal road use it does not matter which type of rocker is used,so long as (i) all eight on the rocker
shaft are of the same type; (ii) all eight are either the same age from the same engine or are new; and
(iii) the tappet adjusting screws and nuts, plus the rocker spacing washers, are correct for the type of
rocker. Note that the forged rock ers have replaceable bushes, whereas the other two designs do not.
Several designs of high-lift and roller rockers are available for tuning purposes, along with special valve
springs to avoid coil binding. Please contact Somerford Mini for details of these and other tuning par ts.
77 2A21 BUSH, rock er 8 Included in forged rocker.
78 5C2436 RIVET, bush to rocker 8 Included in forged rocker.
79 12A1215 SCREW, tappet adjusting 8 Use with pressed steel rocker.
80 6K654 NUT, locking screw 8 Use with pressed steel rocker.
81 AEG167 SCREW, tappet adjusting 8 Use with forged rocker.
82 NT605061 NUT, locking screw 8 Use with forged rocker.
83 12H3376 SCREW, tappet adjusting 8 Use with scintered rocker.
84 51K1178 NUT, locking screw 8 Use with scintered rocker.
85 6K556 SPRING, rocker spacing 3
86 AEG168 DISTANCE PIECE, exhaust rock er 6 For pressed steel and forged rock ers.
87 2A18 WASHER, double coil, outer ends of shaft 2 For scintered rockers.
The distance piece AEG168 is used to position forged rock ers correctly over the exhaust valves. It is only
required on big bore (970, 1071 and 1275cc) cylinder heads, where the valves are spaced further apart
than on other A Series engines. The wider scintered rockers do not require distance pieces, so instead use
the more usual A Series set up of double coil (or ‘Thackery’) washers at either end of the rocker shaft.
88 6K555 WASHER, plain, outer ends of shaft 2
89 ZPS314 SPLIT PIN, outer ends of shaft 2
Valve Guides and Valve Seat Inserts
90 12G1111 GUIDE, inlet and exhaust valve 8 Standard size .
12G1111010 GUIDE, inlet and exhaust valve 8 0.010" oversize.
91 12G1089 INSERT, inlet valve seat 4 1969-80, not lead free fuel compatible.
92 12G1090 INSERT, exhaust valve seat 4 1969-80, not lead free fuel compatible.
TAM2069 INSERT, exhaust valve seat 4 1990 on, lead free fuel compatible .
Valves and Valve Springs
Valves are a lot more simple on the Mini 1275cc cylinder head than on other A Series heads. There are
two types, identifiable by the collet grooves on the valve stems. The 1969-80 design of valve has a
single collet groove 1/4" deep, whereas the later (lead free) valve design fitted in the 1990s has a
distinctive triple groove. Care must be taken to ensure that valves, valve caps and collets are matched
before attempting reassembly. The later triple groove valves, caps and collets may be used on ear lier
cylinder heads along with TAM2069 exhaust valve seat inserts as a lead free conversion. Austin and MG
Metro components are also detailed here for the benefit of the many, many Mini owners who have
transplanted Metro power units into their cars. A range of uprated valves, valve springs and caps to suit
most uses are also available from Somerford Mini; please contact us for details.
1969-80 (original pre-A Plus Mini engines)
1980-84 (early A Plus Austin and MG Metro engines)
Valves With 1/4" Collet Groove
93 12G941 VALVE, inlet, 1 5/16" (33mm) dia. 4 Mini and Austin Metro engines .
AEG592 VALVE, inlet, 1 13/32" (35.6mm) dia. 4 MG Metro engines.
94 CAM4601 VALVE, exhaust, 1 5/32" (29.4mm) dia. 4
95 12G1015 SPRING, valve 8
96 88G459 SPLIT COLLET, pair, valve retaining 8
97 88G617 CAP, upper, valve spring 8
98 AEG327 OIL SEAL, valve stem 4/8
Oil seals were usually fitted on the inlet valve stems only, but they can be fitted on exhaust valves too.
Opinions differ on which is better - the choice is yours.
1990 On (original A Plus Mini engines)
1984-90 (later A Plus Austin and MG Metro engines)
Valves With Triple Collet Groove
99 TAM1058 VALVE, inlet, 1 5/16" (33mm) dia. 4 Lead free; Mini and Austin Metro engines.
TAM1059 VALVE, inlet, 1 13/32" (35.6mm) dia. 4 Lead free; MG Metro engines.
100 TAM1061 VALVE, exhaust, 1 5/32" (29.4mm) dia. 4 Lead free fuel compatible.
101 12G1015 SPRING, valve 8
102 CAM6975 SPLIT COLLET, pair, valve retaining 8
103 AHU1897 CAP, upper, valve spring 8
104 ADU4905 OIL SEAL, valve stem 8
Tel. 01249 721421 Fax. 01249 721316 www.somerford-mini.co.uk
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