Internal engine - 848 and 997cc

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SET SCREW- 5/16 UNF x 5/8''
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WASHER - PLAIN - 5/16"
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SET SCREW-5/16'' UNF x 3/4''
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CAM FOLLOWER (NO OIL HOLE)
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CAM FOLLOWER +010'' OVERSIZE
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LOCK TAB-BIG END CAP-NOT 1275
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LOCKTAB-CAMSHAFT SPROCKET
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PIN-GUDGEON-850 & 997 PISTONS
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TIMING CHAIN-SIMPLEX
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NUT-TIMING GEAR TO CAMSHAFT
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KEY-WOODRUFF -CRANKSHAFT
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CAMSHAFT-PIN DRIVE-997cc
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Part No: 8G2177010
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Part No: 8G2177STD
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Part No: BHM1291003
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THRUST WASHER SET-850cc +003''
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THRUST WASHER SET-850cc +030''
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THRUST WASHER SET 850cc STD. SIZE
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THRUST WASHER SET CRANK 997,998,1098,+.003''
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THRUST WASHER SET CRANK 997,998,1098 +.030''
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Part No: BHM1292STD
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Pistons, Piston Rings and Cylinder Liners
Note before ordering a piston set or ring set from Somerford Mini: a set of pistons consists of four pistons complete with rings and gudgeon pins; a set of rings 
consists of sufficient rings for four pistons.  Cylinder liners are supplied individually.  Various piston upgrades (superior design and manufacture, different  
capacities and compression ratios) are also available from Somerford Mini, but are only listed in this catalogue in instances where they make a good, 
complication-free replacement for original specification pistons which are in short supply.  
         
848cc
Ill. No. Part No. Description Qty. Rqd. Remarks
1 12A120STD PISTON SET, original 4 ring type 1 Set of 4, standard size.
  12A120020 PISTON SET, original 4 ring type 1 Set of 4, +0.020" oversize.
  12A120030 PISTON SET, original 4 ring type 1 Set of 4, +0.030" oversize.
  12A120040 PISTON SET, original 4 ring type 1 Set of 4, +0.040" oversize.
  12A120060 PISTON SET, original 4 ring type 1 Set of 4, +0.060" oversize.
  15037STD PISTON SET, replacement 5 ring type 1 Set of 4, standard size.
  15037020 PISTON SET, replacement 5 ring type 1 Set of 4, +0.020" oversize.
  15037030 PISTON SET, replacement 5 ring type 1 Set of 4, +0.030" oversize.
  15037040 PISTON SET, replacement 5 ring type 1 Set of 4, +0.040" oversize.
  15037060 PISTON SET, replacement 5 ring type 1 Set of 4, +0.060" oversize.
2 BHM1161STD RING SET, for original 4 ring pistons 1 4 piston set, standard size.
  BHM1161020 RING SET, for original 4 ring pistons 1 4 piston set, +0.020" oversize.
  BHM1161030 RING SET, for original 4 ring pistons 1 4 piston set, +0.030" oversize.
  BHM1161040 RING SET, for original 4 ring pistons 1 4 piston set, +0.040" oversize.
  BHM1161060 RING SET, for original 4 ring pistons 1 4 piston set, +0.060" oversize.
  R8577STD RING SET, for replacement 5 ring pistons 1 4 piston set, standard size.
  R8577020 RING SET, for replacement 5 ring pistons 1 4 piston set, +0.020" oversize.
  R8577030 RING SET, for replacement 5 ring pistons 1 4 piston set, +0.030" oversize.
  R8577040 RING SET, for replacement 5 ring pistons 1 4 piston set, +0.040" oversize.
  R8577060 RING SET, for replacement 5 ring pistons 1 4 piston set, +0.060" oversize.
         
997cc
Ill. No. Part No. Description Qty. Rqd. Remarks
3 12A212STD PISTON SET, original 4 ring type 1 Set of 4, 9:1 CR; standard size.
  12A212010 PISTON SET, original 4 ring type 1 Set of 4, 9:1 CR; +0.010" oversize.
  12A212020 PISTON SET, original 4 ring type 1 Set of 4, 9:1 CR; +0.020" oversize.
  12A212030 PISTON SET, original 4 ring type 1 Set of 4, 9:1 CR; +0.030" oversize.
  12A212040 PISTON SET, original 4 ring type 1 Set of 4, 9:1 CR; +0.040" oversize.
  12A406STD PISTON SET, original 4 ring type 1 Set of 4, 8.3:1 CR; standard size.
  12A406010 PISTON SET, original 4 ring type 1 Set of 4, 8.3:1 CR; +0.010" oversize.
  12A406020 PISTON SET, original 4 ring type 1 Set of 4, 8.3:1 CR; +0.020" oversize.
  12A406030 PISTON SET, original 4 ring type 1 Set of 4, 8.3:1 CR; +0.030" oversize.
  12A406040 PISTON SET, original 4 ring type 1 Set of 4, 8.3:1 CR; +0.040" oversize.
4 12A214STD RING SET, pistons 1 4 piston set, standard size.
  12A214010 RING SET, pistons 1 4 piston set, +0.010" oversize.
  12A214020 RING SET, pistons 1 4 piston set, +0.020" oversize.
  12A214030 RING SET, pistons 1 4 piston set, +0.030" oversize.
  12A214040 RING SET, pistons 1 4 piston set, +0.040" oversize.
5 2A837 PIN, gudgeon 4 Included in piston sets.
6 12G164 LINER, cylinder 4 848cc, standard size.
  12A391 LINER, cylinder 4 997cc, standard size.
         
Connecting Rods and Crankshaft
Connecting Rods  
In 1981 the connecting rod big end cap screw was changed to an improved stretch bolt design which no longer required a lock tab to ensure it was secured in 
place.  New connecting rod assemblies are most likely to include stretch bolts, although 'new old stock' rods with bolts and lock tabs that have been gathering 
dust in a corner of a store for many years may still surface from time to time.  When reassembling an engine, make sure all big end caps are secured by the
same bolt design.
Ill. No. Part No. Description Qty. Rqd. Remarks
7 12A1626 ROD ASS'Y, connecting, nos 2 and 4 2  
8 12A1627 ROD ASS'Y, connecting, nos 1 and 3 2  
9 12G2217 BOLT, connecting rod cap ('big end') 8 1959-81; see note above. 
10 2A660 LOCK TAB, bolt 4 1959-81; see note above. 
11 CAM6126 BOLT, connecting rod cap ('big end') 8 1981 on; see note above.
12 51K1382 SCREW, clamping gudgeon pin 4  
13 LWZ305 WASHER, locking 4  
14 8G2198STD BEARING SET, connecting rod ('big end bearings') 1 Set of 4 pairs, standard size. 
  8G2198010 BEARING SET, connecting rod ('big end bearings') 1 Set of 4 pairs, 0.010" undersize.
  8G2198020 BEARING SET, connecting rod ('big end bearings') 1 Set of 4 pairs, 0.020" undersize.
  8G2198030 BEARING SET, connecting rod ('big end bearings') 1 Set of 4 pairs, 0.030" undersize.
  8G2198040 BEARING SET, connecting rod ('big end bearings') 1 Set of 4 pairs, 0.040" undersize.
         
Crankshaft
Crankshafts shown here are either assemblies (including main bearings, connecting rod bearings and thrust washers),  or bare (without bearings or thrust washers).  
However, please note that new crankshafts may be supplied complete with bearings but other times not, depending on what is available at the time.  Additionally 
Somerford Mini can offer a crankshaft regrinding service, usually carried out on your old unit.  You should enquire on the current status of supply before ordering a 
crankshaft from Somerford Mini.  
         
For details of the primary gear and its oil-fed bushes or Deva bushes located on the tail of the crankshaft, please see the 'Manual Gearbox - Primary, Idler and 
Drive Gears' section or the 'Automatic Transmission - Torque Converter and Housing'  section in the Transmissions area of the Somerford Mini catalogue.  Finally, 
note that many oil-fed bush type crankshafts have been converted to the later Deva bush operation (using a different primary gear), so the safest way of identifying 
your old crankshaft is by finding and making a note of its stamped number.  This isn't totally infallible if you have a 997cc crankshaft; the raw 12A298 
crankshaft was machined both for the initial (and completely defunct) 'D.U.' bush primary gear system and the Deva bush type.  If you have a 12A298 crank,
measuring the machined tail diameter will determine what you have: 1 3/8" for D.U. bush, 1 1/2" for Deva bush.
Ill. No. Part No. Description Qty. Rqd. Remarks
15 28G113 CRANKSHAFT ASS'Y, with bearings, oil-fed bush type, 1 3/8" tail diameter 1 848cc 1959-62.  Stamped no. 22A62.
  28G179 CRANKSHAFT ASS'Y, with bearings, Deva bush type, 1 3/8" tail diameter 1 848cc 1962-63.  Stamped no. 22A298.
  8G2734 CRANKSHAFT ASS'Y, with bearings, Deva bush type, 1 1/2" tail diameter 1 848cc 1963-84.  Stamped no. 12A670.
  28G153 CRANKSHAFT ASS'Y, with bearings, oil-fed bush type, 1 3/8" tail diameter 1 997cc 1961-62.  Stamped no. 12A375.
  28G178 CRANKSHAFT ASS'Y, with bearings, Deva bush type, 1 1/2" tail diameter 1 997cc 1962-63.  Stamped no. 12A298.
16 22A62 CRANKSHAFT, bare, oil-fed bush type, 1 3/8" tail diameter 1 848cc 1959-62.  Stamped no. 22A62.
  22A298 CRANKSHAFT, bare, Deva bush type, 1 3/8" tail diameter 1 848cc 1962-63.  Stamped no. 22A298.
  12A670 CRANKSHAFT, bare, Deva bush type, 1 1/2" tail diameter 1 848cc 1963-84.  Stamped no. 12A670.
  12A375 CRANKSHAFT, bare, oil-fed bush type, 1 3/8" tail diameter 1 997cc 1961-62.  Stamped no. 12A375.
  12A298 CRANKSHAFT, bare, Deva bush type, 1 1/2" tail diameter 1 997cc 1962-63.  Stamped no. 12A298.
17 22A123 PLUG, crankshaft, brass 1 For oil-fed bush type crankshafts.
18 12A604 PLUG, primary gear oilway 1 For oil-fed bush type crankshafts when converted to Deva bush.
         
There are two distinct main bearing designs: 8G2177 bearings have a crankshaft journal width of 1.192" (30.28mm), whereas 8G2332 bearings have a width of 
1.067" (27.1mm).  The wider 8G2177 type fit 848cc engines built between 1959 and 1969 (engine number prefixes 8A, 8MB, 8AM, 8AH, 8AJ, 8AK, 8WR),  
whereas 8G2332 bearings fit all 997cc engines, plus 848cc engines built from 1969 onwards (engine number prefix 85H).
Ill. No. Part No. Description Qty. Rqd. Remarks
19 8G2177STD BEARING SET, main bearings, set of 3 pairs 1 848cc 1959-69, std. size.
  8G2177010 BEARING SET, main bearings, set of 3 pairs 1 848cc 1959-69, 0.010" undersize.
  8G2177020 BEARING SET, main bearings, set of 3 pairs 1 848cc 1959-69, 0.020" undersize.
  8G2177030 BEARING SET, main bearings, set of 3 pairs 1 848cc 1959-69, 0.030" undersize.
  8G2177040 BEARING SET, main bearings, set of 3 pairs 1 848cc 1959-69, 0.040" undersize.
  8G2332STD BEARING SET, main bearings, set of 3 pairs 1 848cc 1969 on, 997cc; std. size.
  8G2332010 BEARING SET, main bearings, set of 3 pairs 1 848cc 1969 on, 997cc; 0.010" undersize.
  8G2332020 BEARING SET, main bearings, set of 3 pairs 1 848cc 1969 on, 997cc; 0.020" undersize.
  8G2332030 BEARING SET, main bearings, set of 3 pairs 1 848cc 1969 on, 997cc; 0.030" undersize.
  8G2332040 BEARING SET, main bearings, set of 3 pairs 1 848cc 1969 on, 997cc; 0.040" undersize.
         
Thrust washers are supplied as a pair; i.e. one upper and one lower thrust washer.  Two pairs are required per engine, fitted selectively to obtain the correct amount of end float on the crankshaft.
Ill. No. Part No. Description Qty. Rqd. Remarks
20 BHM1291STD THRUST WASHERS, crankshaft, pair A/R 848cc, standard size.
  BHM1291003 THRUST WASHERS, crankshaft, pair A/R 848cc, +0.003" oversize.
  BHM1291030 THRUST WASHERS, crankshaft, pair A/R 848cc, +0.030" oversize.
  BHM1292STD THRUST WASHERS, crankshaft, pair A/R 997cc, standard size.
  BHM1292003 THRUST WASHERS, crankshaft, pair A/R 997cc, +0.003" oversize.
  BHM1292030 THRUST WASHERS, crankshaft, pair A/R 997cc, +0.030" oversize.
21 6K836 KEY, Woodruff, crankshaft 1  
22 8G725 GEAR, timing chain, crankshaft 1 848cc.
  AEA538 GEAR, timing chain, crankshaft 1 997cc.
23 6K628 WASHER, packing A/R  
24 12A1148 OIL THROWER, crankshaft 1  
25 88G561 OIL SEAL, timing cover 1 Included in timing cover assembly.
         
Crankshaft Pulley
The 848cc engine was never fitted with a vibration damper type pulley.  The 997cc unit did receive one, or in fact two different ones.  The original design was a
separate pulley with a damper screwed to it; eventually a one-piece damper pulley was offered as a replacement but in fact both set ups remained available as
spares for many years.  If you want the original pulley, it is still available today from Somerford Mini.  
         
Note that the bolt retaining the pulley to the crankshaft is specific to the type of pulley being fitted.  Later '85H' 848cc engines from 1980 approximately onwards 
received a pulley with a strobe timing plate attached as part of the A Plus modification programme.  
         
848cc Crankshaft Pulley
Ill. No. Part No. Description Qty. Rqd. Remarks
26 2A940 PULLEY, crankshaft 1 1959-70, dynamo fitted models.
  12A1380 PULLEY, crankshaft 1 1959-70, alternator fitted models.
  CAM6323 PULLEY, crankshaft 1 1970-80; may be used on earlier engines.
  CAM6497 PULLEY, crankshaft 1 1980 on; A Plus type with timing plate.
27 AEA312 BOLT, pulley to crankshaft 1  
28 12A398 LOCK TAB, pulley bolt 1  
         
997cc Crankshaft Pulley
Ill. No. Part No. Description Qty. Rqd. Remarks
29 AEG454 PULLEY, crankshaft 1 Separate pulley and damper fitment. 
30 12A367 DAMPER 1 Separate pulley and damper fitment. 
31 SH605051 SCREW, damper to pulley 4 Separate pulley and damper fitment. 
32 LWZ305 WASHER, locking 4 Separate pulley and damper fitment. 
33 AEA312 BOLT, pulley to crankshaft 1 Separate pulley and damper fitment. 
34 12A398 LOCK TAB, pulley bolt 1 Separate pulley and damper fitment. 
35 88G305 PULLEY, crankshaft, with damper 1 One-piece damper pulley fitment.
36 12A283 BOLT, pulley to crankshaft 1 One-piece damper pulley fitment.
37 12A398 LOCK TAB, pulley bolt 1 One-piece damper pulley fitment.
         
Camshaft and Tappets
A range of uprated camshafts and other engine tuning components are also available from Somerford Mini, but are not listed here.  Please contact us for details.
Ill. No. Part No. Description Qty. Rqd. Remarks
38 8G712 CAMSHAFT, for 'pin drive' oil pump 1 848cc, manual gearbox, 1959-80.
  CAM6267 CAMSHAFT, for 'slot drive' oil pump 1 848cc, manual gearbox, 1980 on.  A Plus type.
  12A1065 CAMSHAFT, for 'star drive' oil pump 1 848cc, automatic gearbox.
  88G229 CAMSHAFT, for 'pin drive' oil pump 1 997cc.
39 2A299 PIN, oil pump drive 1 Included in 'pin drive' type camshafts.
40 CHM108 FLANGE, for 'star drive' oil pump (flange also known as 'spider') 1 Use with 'star drive' type camshaft.
41 12G4499 SPINDLE, distributor drive 1  
42 2A13 TAPPET (also known as cam follower) 8 Standard size.
  2A13010 TAPPET (also known as cam follower) 8 +0.010" oversize.
43 2A14 PUSH ROD 8 Alternative to 12A250 when replaced in sets.
  12A250 PUSH ROD 8 Alternative to 2A14 when replaced in sets.
         
Timing Chain
Ill. No. Part No. Description Qty. Rqd. Remarks
44 3H2127 CHAIN, timing 1  
45 2A85 GEAR, timing chain, camshaft, with ring tensioners 1 1959-74, may be replaced by 12G4337 without ring tensioners.
46 2A86 GEAR, timing chain, camshaft, ring tensioner type 1 1959-74, may be replaced by 12G4337 without ring tensioners.
47 12G4337 GEAR, timing chain, camshaft 1 1974-79, use without ring tensioners. 1979 on, use with tensioner pad.
48 8G549 RING, timing chain tensioner, rubber 2 1959-74.
49 12G2621 PAD, timing chain tensioner 1 1979 on.
50 12G2629 PIN, tensioner pivot 1 1979 on.
51 12G2628 PLATE, tensioner mounting 1 1979 on.
52 SH605061 SCREW, plate to cylinder block 2 1979 on.
53 LWZ305 WASHER, locking 2 1979 on.
54 PWZ105 WASHER, plain 2 1979 on.
55 WKN505 KEY, Woodruff 1  
56 6K629 NUT, gear to camshaft 1  
57 2A759 LOCK TAB, nut 1  
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