Cylinder head - 848 and 997cc

Part No: 2A150C
  In Stock
Rocker Cover Chrome Nut
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£2.52 inc VAT
£2.10 ex VAT
Part No: LWZ205
  In Stock
WASHER-SPRING, 5/16''
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£0.37 inc VAT
£0.31 ex VAT
Part No: FNZ104
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NUT - 1/4" UNF
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£0.29 ex VAT
Part No: FNZ105
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NUT - 5/16" UNF
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Part No: PWZ105
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WASHER - PLAIN - 5/16"
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Part No: 2A150
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Part No: 12A1358
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Part No: PWZ106
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WASHER- PLAIN 3/8 ID SMALL OD
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Part No: LWZ304
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USE: LWZ204
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Part No: CAM4126
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CLIP-HOSE 3/4'' STEEL BAND TYPE
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Part No: 51K885
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Part No: 53K402
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Part No: 12A2075
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Part No: 12A186
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Part No: 12A1950
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ROCKER SHAFT-STANDARD
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Part No: 12A1968
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Part No: 12A1987
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Part No: 12A402
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Part No: 12G1926
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Part No: 12G1927
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Part No: 12G3036
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Part No: 12G679
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Part No: 12G687
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SPACER-CHROME-ROCKER COVER
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Part No: 12H3376
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Part No: 13H2296
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Part No: 1A2156
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WASHER-CUP-ROCKER COVER
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Part No: 1B2925
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SPACER-ROCKER COVER BOLT
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Part No: 2A12
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CIRCLIP-VALVE COLLET-'59-'69
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Part No: 2A18
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Part No: 2A180
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Part No: 2A21
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BUSH-ROCKER-STANDARD
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Part No: 2A243
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USE: 12A2075
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Part No: 2A258
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Part No: 2A259
  Available to Customer Order
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Required Quantity: 1
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Part No: 2A545
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SHROUD-VALVE GUIDE-'59-'69
Required Quantity: 8
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Part No: 2A639
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Part No: 2A640
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Part No: 2A877
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Part No: 2A879
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SEAL-VALVE STEM 'O' RING TYPE
Required Quantity: 8
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Part No: 2A964
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ROCKER-PRESSED STEEL TYPE
Required Quantity: 8
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Part No: 2K1345
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Part No: 51K1177
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Part No: 51K1178
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Part No: 51K1193
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Part No: 51K1473
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USE: CHS522
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Part No: 53K487
  In Stock
£1.13 inc VAT
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Part No: 5C2436
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RIVET-BUSH TO ROCKER
Required Quantity: 8
£0.00 inc VAT
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Part No: 6K555
  In Stock
£0.90 inc VAT
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Part No: 6K556
  In Stock
SPRING-ROCKER SPACING
Required Quantity: 3
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Part No: 6K654
  In Stock
£0.91 inc VAT
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Part No: 6K808
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PLUG-OIL HOLE-CYLINDER HEAD
Required Quantity: 1
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Part No: 6K878
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Part No: 88G459
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Part No: 88G616
  In Stock
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Part No: 8G612
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Part No: ADU4905
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Part No: AEA311
  In Stock
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Part No: AEA399
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USE: AEA574
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Part No: AEA400
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Part No: AEA434
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Part No: AEA574
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Part No: AEA762
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USE: TAM2068
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Part No: AEG167
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USE: 12A1950
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Part No: CAM150
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Part No: CAM151
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Part No: CAM289
  In Stock
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Part No: CAM4545
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NUT-CYLINDER HEAD NUT-'78 ON
Required Quantity: 9
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Part No: CAM6391
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Part No: CAM6503
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Part No: CAM6505
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Part No: CAM6520
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SHIM-VALVE SPRING 848cc '74-'81
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Part No: CAM6822
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Part No: CAM6822FK
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Part No: CAM6823
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Part No: CHS2515
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STUD-5/16 UNF/UNC x 1 7/8''
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Part No: GB126B
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Part No: GEG101SM
  In Stock
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Part No: GEG401
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GASKET- ROCKER COVER-CORK
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Part No: GFE6007
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Part No: GHF261
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Part No: GUG2506C
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Part No: GUG704053MG
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Part No: GUG705558
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Part No: NH605040
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NUT-5/16 UNF NATURAL FINISH
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Part No: NT605061
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Part No: TAM2068
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848 and 997cc Cylinder Head Identification
Cylinder head details in this section are appropriate for the 848cc engine used in Minis between 1959 and 1984 and the 997cc engine used in the earliest Mini Coopers built between 1961 and 1963. The 848cc transverse engine was also to be seen in earlier Mokes and a small number of Austin Metro vans, plus in in-line' form, in an even smaller number of Austin A35 vans. The earliest variant of the Mini Cooper was the only BMC/Leyland product ever to receive the 997cc engine.
         
The cylinder head design for the 848cc Mini engine is shared with the standard tune Mini 998cc engine, but not the 998cc Cooper unit. It was also shared with other BMC model engines, including 803 and 948cc units to be found in Morris Minors, Austin A30, A35 and A40 models and the 'Frogeye' Austin Healey Sprite Mk I. Only the castings marked 2A628 (usually earlier models) or 12A1456 (later models) are appropriate for Mini - the outwardly similar 2A629 is not. The other obvious distinguishing feature of this cylinder head is the inlet valve diameter, which at just 1 1/16" (27mm) is the smallest of any A Series head design.
         
The 997cc Cooper cylinder head was also fitted to various standard tune 1098cc engines, including the single carburetter Austin/Morris 1100 and the 1098cc Minis, plus the high performance 948cc Austin Healey Sprite Mk II and MG Midget Mk I. For identification purposes the casting number is 12G202 and the inlet valves are 1 5/32" (29.4mm) diameter.
         
At various times during A Series engine production, new and reconditioned cylinder heads from the factory were either in 'assembly' or 'bare' condition. Assemblies usually included studs, valves, valve springs and guides (but not rockers, rocker shaft and pedestals) whereas bare heads usually included valve guides and studs only. These states of build were however not hard and fast, so if you are offered a new or reconditioned factory cylinder head on an exchange unit scheme you should establish before ordering exactly what you will receive, to guard against the possibility of giving away components on your old head that you will still need in future!
         
Rebuilt or Repaired 848 and 997cc Cylinder Heads
Somerford Mini Ltd. offers a bespoke cylinder head rebuilding and repair service. In our experience, a large number of customers require some degree of modification to their cylinder heads and as a result, whether you want a standard head or one that is uprated to any degree, we ask you to contact us to discuss your requirements. It would be helpful if you could also supply us with the details of your engine: full engine number (if known) and type (capacity, high or low compression, gearbox, breathing system, etc.), plus any existing modifications. The more you can provide us with, the better we can help you. All of our cylinder heads are built to run on lead-free fuel, unless you specify otherwise.
         
Ill. No. Part No. Description Qty. Rqd. Remarks
1 - CYLINDER HEAD ASS'Y, with valves 1 848cc; please contact us for details.
    (2A628 or 12A1456 casting number)    
  - CYLINDER HEAD ASS'Y, with valves 1 997cc; please contact us for details.
    (12G202 casting number)    
2 - CYLINDER HEAD, bare, with guides and studs only 1 848cc; please contact us for details.
    (2A628 or 12A1456 casting number)    
  - CYLINDER HEAD, bare, with guides and studs only 1 997cc; please contact us for details.
    (12G202 casting number)    
         
Gasket Set
Ill. No. Part No. Description Qty. Rqd. Remarks
3 GEG101SM GASKET SET, cylinder head 1 See note below.
The cylinder head gasket set, also known as a 'decoke' or 'decarbonising' set, includes the cylinder head gasket, manifold gasket, two thermostat housing gaskets (one extra to cater for later engines with sandwich plates), six HS2 carburetter gaskets, three HS4 carburetter gaskets, rocker cover gasket and heater valve gasket. Valve stem oil seals are not included, leaving customers to choose the type and quantity they need and order them separately.
         
Cylinder Head Components
Cylinder Head Fixings
Ill. No. Part No. Description Qty. Rqd. Remarks
4 GUG2506C GASKET, cylinder head, copper 1  
5 CAM150 STUD, cylinder head, long 4  
6 CAM151 STUD, cylinder head, short 5  
7 51K1193 NUT, cylinder head to block 9 1959-78 standard fitment.
8 PWZ106 WASHER, plain 9 1959-78 standard fitment.
  GB126B WASHER, plain 9 Alternative heavy duty washer. Withstands up to 80lbf ft torque.
9 CAM4545 NUT, flanged, cylinder head to block 9 1978 on standard fitment.
    (does not require plain washer)   1959-78 heavy duty alternative.
         
Plugs and Adaptors
Ill. No. Part No. Description Qty. Rqd. Remarks
10 2K1345 PLUG, oil hole, cylinder head 1 Alternative to 6K808.
  6K808 PLUG, oil hole, cylinder head 1 Alternative to 2K1345.
11A 2A243 ADAPTOR, by-pass hose, short 1 1959-69; use with long by-pass hose.
  12A2075 ADAPTOR, by-pass hose, long 1 1969 on; use with short by-pass hose.
10B CAM4126 PLUG, bypass adaptor blanking A/R Use if thermostat blanking sleeve is fitted.
10C 3H2963 CLIP, bypass blanking plug A/R  
12 ADP210 PLUG, temperature sender unit boss 1 Models without temperature gauge.
13 1B3664 WASHER, sealing 1 Models without temperature gauge.
         
Thermostat Housing and Fixings
Ill. No. Part No. Description Qty. Rqd. Remarks
14 - HOUSING, thermostat 1  
For details of thermostat housings, please see the 'Cooling - Thermostats and Water Pumps' section in the Cooling and Heating area of the Somerford Mini catalogue.
         
Ill. No. Part No. Description Qty. Rqd. Remarks
15 GTG101 GASKET, thermostat housing, cork 1  
  GUG705558 GASKET, thermostat housing, paper 1  
In theory the two gasket materials are interchangeable, but the cork gasket seems to be preferred by Somerford Mini customers for a simple thermostat housing fitment, whereas the later paper gasket is preferred for a thermostat housing with sandwich plate (not applicable for 848 and 997cc engines).
         
Ill. No. Part No. Description Qty. Rqd. Remarks
16 CHS2515 STUD, thermostat housing 3  
17 FNZ105 NUT 3  
18 PWZ105 WASHER, plain 3  
         
Heater Valve or Tap and Fixings
Ill. No. Part No. Description Qty. Rqd. Remarks
19 - VALVE, heater 1 See note below.
20 - TAP, heater 1 See note below.
For details of the heater valves and taps, please see the 'Heating - Heater Hoses, Water Control Valves and Cables' section in the Cooling area of the Somerford Mini catalogue.
         
Ill. No. Part No. Description Qty. Rqd. Remarks
21 2A180 PLATE, blanking heater take-off in cylinder head 1 For models without heater.
22 88G221B GASKET, heater take-off 1  
23 53K402 STUD, heater take-off 2  
24 FNZ104 NUT 2  
25 LWZ304 WASHER, locking 2  
         
Manifold Fixings
Ill. No. Part No. Description Qty. Rqd. Remarks
26 GUG704053MG GASKET, manifold 1  
27 53K487 STUD, manifold 6  
Very early 848cc cylinder heads used two each of long, medium and short manifold studs; these were soon replaced in production by six of the medium length studs, which can also be fitted to the earliest engines without any necessary modification.
         
Ill. No. Part No. Description Qty. Rqd. Remarks
28 12A1211 WASHER, plain, large, clamping manifold 4  
29 PWZ105 WASHER, plain 2  
30 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.
The steel nut alternative was fitted off and on over the years (most likely as a panic measure when the production line ran out of brass nuts) but does tend to sieze on the manifold studs unless plenty of copper grease is applied.
         
Rocker Cover and Fixings
Ill. No. Part No. Description Qty. Rqd. Remarks
31 12A475 ROCKER COVER, steel, with breather pipe 1 1959-69 open circuit breathing models.
32 12A1530 ROCKER COVER, steel, without breather pipe 1 1964 on closed circuit breathing models.
33 CAM6822 ROCKER COVER, alloy, without breather pipe 1 Accessory (also MG Metro) item for closed circuit breathing models.
A range of polished or painted alloy accessory rocker covers is available from Somerford Mini; please contact us for details. Note that some accessory rocker covers require different fixings from the standard items.
         
Ill. No. Part No. Description Qty. Rqd. Remarks
34 - PLATE, engine name 1 See note below.
  - DECAL, engine name 1 See note below.
  - PLATE, engine patent 1 See note below.
  - DECAL, engine patent 1 See note below.
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.
         
Ill. No. Part No. Description Qty. Rqd. Remarks
35 8G612 CAP, oil filler, metal 1 1959-62 open circuit breathing models.
36 12A402 CAP, oil filler, black plastic, without breather 1 1962-69 open circuit breathing models. Will fit 1959-62 models.
37 13H2296 CAP, oil filler, black plastic, with breather 1 1964 on closed circuit breathing models.
38 GFE6007 CAP, oil filler, red plastic, with breather 1 For CAM6822 alloy rocker cover.
39 12A403 SEAL, plastic oil filler cap 1 For 12A402 and 13H2296 caps.
40 GEG401 GASKET, rocker cover 1  
41 CAM6822FK CHROME FIXINGS KIT, rocker cover 1  
Includes chrome nuts, chrome distance pieces, chrome cup washers and rubber bushes. For alloy rocker covers such as CAM6822.
         
Ill. No. Part No. Description Qty. Rqd. Remarks
42 2A150 NUT, rocker cover to engine 2 Original zinc finish.
  2A150C NUT, rocker cover to engine 2 Chrome finish, for steel rocker covers.
  CAM6823 NUT, rocker cover to engine 2 Chrome finish, longer, for alloy rocker covers.
43 1B2925 DISTANCE PIECE 2 Original zinc finish.
  12G687 DISTANCE PIECE 2 Alternative chrome finish.
44 1A2156 WASHER, cup 2 Original zinc finish.
  12G679 WASHER, cup 2 Alternative chrome finish.
45 12A1358 BUSH, rubber 2  
46 12A1968 LIFTING EYE, engine, temporary fitment 2 Fit to engine only while lifting work is taking place.
         
Rocker Shaft, Rockers and Fixings
Ill. No. Part No. Description Qty. Rqd. Remarks
47 12G1926 PEDESTAL, rocker shaft, with oil hole 3  
48 12G1927 PEDESTAL, rocker shaft, with tapped hole 1  
49 2A258 SCREW, locating rocker shaft 1  
50 2A515 PLATE, securing screw 1 1959-74.
51 2A259 PLATE, securing screw 1 1974 on; will fit 1959-74 models.
52 51K885 STUD, long, rocker cover and rocker pedestal 2 Outer pedestals.
53 51K1473 STUD, short, rocker pedestal 2 Inner pedestals.
54 NH605040 NUT, pedestal to cylinder head 4  
55 LWZ205 WASHER, locking 4 1959-74.
56 PWZ105 WASHER, plain 3 1974 on. Not used on tapped pedestal.
57 PWZ106 WASHER, plain 3 1974 on. Not used on tapped pedestal.
58 AEG399 ROCKER SHAFT ASS'Y 1 1959-74.
59 12A1950 ROCKER SHAFT 1 1974 on; will fit 1959-74 models.
60 6K878 END PLUG, plain 1 Included in AEG399 rocker shaft ass'y.
61 2K4608 END PLUG, screwed 1 Included in AEG399 rocker shaft ass'y.
62 2A964 ROCKER, pressed steel 8 First rocker type.
63 12G1221 ROCKER, forged 8 Second rocker type.
64 CAM289 ROCKER, scintered 8 Third rocker type, 1974 on.
The pressed steel rocker was the first to be fitted, back in 1959. Cooper engines saw the introduction of the stronger forged rocker as a production alternative in the early 1960s, the two types being 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 parts 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 are correct for the type of rocker. Note that the forged rockers have replaceable bushes, whereas the other two designs do not.
         
The pressed steel rocker listed here, 2A964, is the original 'small bore' A Series item; the 'big bore' (1275cc) equivalent listed elsewhere in the Somerford Mini catalogue is 12G1313. The difference in theory between the two is a marginal increase in lift with the 'big bore' rocker, although in practice this is often swallowed up by assembly tolerances. Concerning forged rockers, again originally there were small and big bore engine variants, but since the big bore item is the one available (and it works perfectly well on a small bore engine), that's the one we list here. There were no small or big bore variants of the scintered rocker - one type fitted all.
         
Several designs of high-lift and roller rockers are also available for tuning purposes, along with special valve springs to avoid coil binding, if necessary. Please contact Somerford Mini for details of these and other engine tuning parts.
         
Ill. No. Part No. Description Qty. Rqd. Remarks
65 2A21 BUSH, rocker 8 Included in forged rocker.
66 5C2436 RIVET, bush to rocker 8 Included in forged rocker.
67 12A1215 SCREW, tappet adjusting 8 Use with pressed steel rocker.
68 6K654 NUT, locking screw 8 Use with pressed steel rocker.
69 AEG167 SCREW, tappet adjusting 8 Use with forged rocker.
70 NT605061 NUT, locking screw 8 Use with forged rocker.
71 12H3376 SCREW, tappet adjusting 8 Use with scintered rocker.
72 51K1178 NUT, locking screw 8 Use with scintered rocker.
73 6K556 SPRING, rocker spacing 3  
74 2A18 WASHER, double coil, outer ends of shaft 2  
75 6K555 WASHER, plain, outer ends of shaft 2  
76 ZPS314 SPLIT PIN, outer ends of shaft 2  
         
Valve Guides and Valve Seat Inserts
Ill. No. Part No. Description Qty. Rqd. Remarks
77 12G1111 GUIDE, inlet and exhaust valve 8 848cc; standard size.
  12G1111010 GUIDE, inlet and exhaust valve 8 848cc; 0.010" oversize.
  12A186 GUIDE, inlet and exhaust valve 8 997cc; standard size.
  12A186010 GUIDE, inlet and exhaust valve 8 997cc; 0.010" oversize.
78 2A639 INSERT, inlet valve seat 4 Standard size.
  AEA762 INSERT, inlet valve seat 4 1/16" oversize.
79 2A640 INSERT, exhaust valve seat 4 Standard size.
  AEA763 INSERT, exhaust valve seat 4 1/16" oversize; for leaded fuel use.
  TAM2068 INSERT, exhaust valve seat 4 Lead free fuel compatible.
Note that standard size and oversize inserts should not be mixed together on the same cylinder head.
         
Valves and Valve Springs
There are two types of collet used to retain valves in place on these engines and three types of valve to take them. The earlier 848cc valve design up to the early 1970s and the 997cc valve design had a groove 1/4" deep into which the collets located, whereas later 848cc valves had a groove 1/8" deep, either 7/32" from the valve tip or 9/64" from the valve tip (the latter being the 1981 introduced A Plus type). Care must be taken to ensure that valves, valve caps, valve springs and collets are matched before attempting reassembly. Note also that while the earlier large groove collets were originally secured together with circlips, around 1969 these were judged to be adding nothing to the security of the collets and were discontinued.
         
A range of uprated valves, valve springs and caps to suit most uses are also available from Somerford Mini; please contact us for details.
         
848cc 1959-74 approx.
Valves With 1/4" Collet Groove
Ill. No. Part No. Description Qty. Rqd. Remarks
80 2A877 VALVE, inlet, 1 1/16" (27mm) dia. 4  
81 AEA434 VALVE, exhaust, 1" (25.4mm) dia. 4  
82 AEA311 SPRING, valve 8  
83 2A11 SPLIT COLLET, pair, valve retaining 8  
84 2A12 CIRCLIP, valve collet 8 1959-69; no longer fitted.
85 88G616 CAP, upper, valve spring 8  
86 2A879 OIL SEAL, valve stem 8  
87 2A545 SHROUD, valve guide 8 1959-69.
         
997cc 1961-63
Original Valves With 1/4" Collet Groove
Replacement Valves With 1/4" or 1/8" Collet Groove
Original 997cc Cooper valves are understandably thin on the ground these days; if difficulty is experienced in obtaining originals, AEA574 (1/4" groove) or 12G3036 (1/8" groove) inlet valves and AEA434 (1/4" groove) or 12G3035 (1/8" groove) exhaust valves may be used in their place. Take care to use the correct collets: 2A11 for 1/4" groove valves, 88G459 collets for 1/8" groove valves.
         
Ill. No. Part No. Description Qty. Rqd. Remarks
88 AEA399 VALVE, inlet, 1 5/32" (29.4mm) dia. 4 Original with 1/4" collet groove.
  AEA574 VALVE, inlet, 1 5/32" (29.4mm) dia. 4 Replacement with 1/4" collet groove.
  12G3036 VALVE, inlet, 1 5/32" (29.4mm) dia. 4 Replacement with 1/8" collet groove.
89 AEA400 VALVE, exhaust, 1" (25.4mm) dia. 4 Original with 1/4" collet groove.
  AEA434 VALVE, exhaust, 1" (25.4mm) dia. 4 Replacement with 1/4" collet groove.
  12G3035 VALVE, exhaust, 1" (25.4mm) dia. 4 Replacement with 1/8" collet groove.
90 AEA311 SPRING, valve 8  
91 2A11 SPLIT COLLET, pair, valve retaining 8 Use with original 1/4" groove valves.
  88G459 SPLIT COLLET, pair, valve retaining 8 Use with replacement 1/8" groove valves.
92 2A12 CIRCLIP, valve collet 8 No longer fitted.
93 88G616 CAP, upper, valve spring 8  
94 2A879 OIL SEAL, valve stem 8  
95 2A545 SHROUD, valve guide 8  
         
848cc 1974 approx. to 1981
Valves With 1/8" Collet Groove, 7/32" From Valve Tip
Ill. No. Part No. Description Qty. Rqd. Remarks
96 CAM6391 VALVE, inlet, 1 1/16" (27mm) dia. 4  
97 12A1987 VALVE, exhaust, 1" (25.4mm) dia. 4  
98 AEA311 SPRING, valve 8  
99 88G459 SPLIT COLLET, pair, valve retaining 8  
100 88G616 CAP, upper, valve spring 8  
101 CAM6520 SHIM, valve spring A/R  
         
848cc 1981 On
Valves With 1/8" Collet Groove, 9/64" From Valve Tip (A Plus Type)
Ill. No. Part No. Description Qty. Rqd. Remarks
102 CAM6502 VALVE, inlet, 1 1/16" (27mm) dia. 4  
103 CAM6503 VALVE, exhaust, 1" (25.4mm) dia. 4  
  CAM6505 VALVE, exhaust, 1" (25.4mm) dia., chrome stem 4 Lead free fuel compatible.
104 AEA311 SPRING, valve 8  
105 88G459 SPLIT COLLET, pair, valve retaining 8  
106 88G616 CAP, upper, valve spring 8  
107 ADU4905 OIL SEAL, inlet valve stem 4  
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