Engine & Components



MECHSPEC REBUILT MG ENGINES

We have been rebuilding MGB and Midget Engines now for over 25 years and believe our engines to be among the best in the business

We offer various different specifications or can build an engine to your own spec.

All engines come with a 12 Month or 12,000 mile waranty,and each engine is carefully assembled by either Dave, or our engine builder, Steve.


ENGINE SPECIFICATIONS

Whilst it is not now possible to buy a new MG engine, we rebuild all our engines to as close to new specification as possible. All our engines feature the following:-

  1. 1. Engine block re-bored, honed and fitted with new pistons
  2. 2. Crankshaft re-ground and fitted with new main,big-end and thrust bearings
  3. 3. New oil pump fitted
  4. 4. New camshaft and cam followers (tappets) fitted
  5. 5. New timing chain and tensioner fitted
  6. 6. Peter Burgess unleaded cylinder head with all new valves and springs fitted
  7. 7. Re-conditioned rocker shaft assembly fitted
  8. 8. All new gaskets and seals

ENGINE PRICES

MGB Standard Unleaded Engine £1495.00 Exchange (inc. vat)

(Standard engine with above features)

MGB Fast Road Unleaded Engine £1975.00 Exchange (inc. vat)

(As above but with +.060" pistons
Piper HR285 Camshaft, and Peter Burgess
Fast Road unleaded cylinder head
(approx 100 BHP at wheels)

All engines are sold on an exchange basis which means we require an 'old-unit' in return. Old units must be serviceable (re-buildable). Surcharge for scrap old unit or to buy engine 'outright' without exchange is £175.00.


ENGINE COMPONENTS

Should you wish to rebuild your own engine we offer a full component sevice and machining if required. See parts diagram and listing below for details.


Key Part Number Description New Price £ Used Price £
1 Fully rebuilt exchange unleaded engine £1495.00
  Fully rebuilt exchange 1860cc fast road engine £1975.00
  Good second hand tested engine-prices from £250.00
4 12A1175 Tappet chest cover gasket £0.95
5 12H156 Tappet chest cover front with breather £12.00
6 12A1386 Tappet chest cover rear £3.00
7 BH605201 Locating bolt tappet chest cover £0.60
8 12A1177 Cup washer tappet chest cover £0.78
9 12A1176 Seal tappet chest cover £1.04
10 2A265 Fuel pump blanking plate £3.40 £1.50
11 2A113 Gasket fuel pump blanking plate £0.39
12 SH605041 Bolt fuel pump blanking plate £0.35
13 GHF331 Spring washer fuel pump blanking plate £0.06
14 2K8169 Core plug-dish type £0.75
  AEH592 Core plug-cup type £0.60
15 3H576 Water drain tap £14.95
16 ARH517 Washer water drain tap £0.25
17 53K2853 Waterway drain plug £4.30 £1.00
18 6K638 Washer waterway drain plug £0.22
19 12H997/8 Connecting rod 3-main bearing engine 18G/18GA £15.00
20 51K1774 Pinch bolt £1.70
21 GHF331 Spring washer pinch bolt £0.06
22 12H1019 Connecting rod 18GB engine £15.00
23 12H2444 Connecting rod 18GG engine £15.00
24 CAM1588 Connecting rod 18V engine £12.00
25 Connecting rod bolt 18GB/18GG
26 6K881 Lock tab 18G/GA/GB engine £0.85
27 Connecting rod bolt 18GG/18V
28 Connecting rod nut 18GG/18V
29 Small end bush 18GB/18GG
30 12H961 Piston set 3-main bearing 18G/GA engine £149.00
  12H2521 Piston set 5-main bearing 18GB engine £117.00
  12H2521 Piston set 5-main bearing 18GG engine £117.00
  12H5161 Piston set 5-main bearing 18V engine £109.59
31 8G2506 Piston ring set 4 ring type £54.50
  BHM1183 piston ring set 3 ring type £34.25
32 12H3292 Timing chain tensioner £7.25
33 Timing chain slipper only
34 GHF102 Bolt chain tensioner £0.22
35 AEC340 Locktab chain tensioner £0.47
36 88G561 Timing cover seal £1.90
37 various Timing cover all types £25.00
38 12H1319 Gasket timing cover £1.89
39 GHF120 Bolt -timing cover to engine £0.24
40 GHF332 Washer-spring £0.10
41 GHF301 Washer-flat £0.07
42 SH604031 Bolt-timing cover to plate £0.60
43 GHF117 Bolt-timing cover to bearing cap £0.15
44 GHF331 Washer-spring £0.06
45 GHF300 Washer-flat £0.06
46 6K629 Lock nut camshaft £2.69
47 2A759 Lock washer camshaft £0.75
48 11G203 Camshaft chain wheel Duplex £19.30 £10.00
49 2H4905 Timing chain Duplex £5.30
50 CAM5333 Camshaft chain wheel simplex £16.20 £6.00
51 3H2127 Timing chain simplex £3.90
52 12H1673 Camshaft thrust plate £12.95 £4.00
53 GHF117 Bolt camshaft plate £0.15
54 GHF321 Star washer camshaft plate £0.08
55 GHF120 Bolt frontplate 5/16" x 3/4" £0.24
56 GHF332 Spring washer 5/16" £0.09
57 12H1387 Engine font plate c/b £20.00
58 12H3583 Engine front plate r/b £10.00
59 WKN505 Woodruff key camshaft £0.53
60 88G252E Camshaft 3-main standard exchange POA
  88G303 Camshaft 5-main standard new £89.00
  BHR285E Camshaft Piper HR285 fast road exchange £110.00
61 WKN304 Woodruff key tacho drive gear (3-main only) £0.35
62 1H730 Tacho drive gear (3-main only) £15.00
63 BHM1212 Camshaft bearing set £13.75
64 12H3167 Cam follower 18G/GA/GB/GG £3.80
65 11G241 Pushrod 18G/GA/GB/GG £2.15 £1.00
66 2A13 Cam follower 18V £1.75
67 12H3357 Pushrod 18V £2.79 £1.00
68 12G4499 Distributor drive shaft £12.00
69 1G2285 Distributor housing £10.00
70 SF604061 Locating screw distributor housing £0.30
71 AEA312 Bolt crankshaft pulley £9.45 £2.00
72 12A398 Lock tab crankshaft pulley £0.55
73 various Crankshaft pulley-(please state year) £25.00
74 12H775 Oil thrower-use prior to 12H1740 £2.50
  12H1740 Oil thrower-18GB onwards £0.97
75 12A1553 Crankshaft pulley duplex £15.95 £7.00
76 12H4201 Crankshaft pulley simplex £10.95 £5.00
77 2K6633 Shim crankshaft pulley £0.74
78 various Reground crankshaft with bearings (please state year) £195.00
79 2H326 Woodruff key crankshaft pulley-early £0.86
  12H4301 Woodruff key crankshaft pulley-late £1.99
80 8G2389 Main bearing set (discard 2-pairs for 3-main engine) £19.85
81 8G2207 Big-end (conrod) bearing set 3-main £24.45
  8G2664 Big-end (conrod) bearing set 5-main £16.80
82 BHM1295 Thrust washer set £10.95
83 1G765 Spigot bush crankshaft 3-main £1.79
  22H1416 Spigot bush crankshaft 5-main manual transmission £2.69
  12B1397 Spigot bush crankshaft 5-main auto transmission £4.90
84 12H1301 Dowel crankshaft £1.36
85 12H713E Flywheel (3-main bearing) £89.90 £35.00
  12H1474E Flywheel (5-main bearing inertia starter) £55.00
  12H2184 Flywheel (5-main bearing pre-engaged starter) £89.90 £20.00
86 1G2874 Ring gear flywheel early (inertia starter motor) £21.95
  12H2186 Ring gear flywheel late (pre-engaged starter motor) £20.20
87 51K1022 Bolt-crank to flywheel 3-main
88 FNZ506 Nut-flywheel 3-main
89 6K26 Locktab-flywheel 3-main
90 51K1809 Bolt-flywheel 5-main
91 12H1303 Locktab flywheel 5-main
92 1G2984 Dowel clutch cover
93 12H768 Gasket backplate lower
94 12H762 Gasket backplate upper
95 12H752 Backplate-engine to gearbox 3-main £35.00
  12H1469 Backplate-engine to gearbox 18GB 5-main, 3 synchro £45.00
  CAM1003 Backplate-engine to gearbox 18GD,GG,18V 4 synchro £25.00
96 GHF105 Bolt-backplate top all types
97 GHF333 Washer-backplate top all models
98 53K1779 Bolt-backplate 18G,GA,GD,GG,18V to Sept '76
  SH606071 Bolt-backplate September '76on
  53K1810 Bolt-backplate 18GB 5-main 3-synchro
99 GHF333 Washer spring all engines except 18GB
100 2K6059 Lock tab 18GB 5-main, 3-synchro
101 1H1020 Lock tab 18GB 5-main, 3-synchro
102 1H1021 Lock tab 18GB 5-main, 3-synchro
103 SH605071 Bolt backplate
104 GHF332 Washer spring 3-main only
105 12H1547 Retainer oil seal 5-main only
106 AHU2242 Rear crankshaft seal 5-main only
107 12H541 Blanking plug engine backplate 5-main only
108 12H74 Dipstick 18G,GA,GB,GD
109 1B1735 Gaiter-dipstick 18G,GA,GB,GD
110 1B1063 Tube dipstick 18G,GA,GB,GD
111 12H2964 Dipstick 18GG,18V581/582/583 to 1972
112 12H3963 Dipstick 18V581/582/583 1973 on 18V779-847
113 12H3351 Tube-dipstick For 12H2964 and 3963
114 CAM1039 Spindle-oil pump drive
115 88G296 Oil pump 3-main bearing
  12H1429 Oil pump 5-main bearing
116 88G420 Gasket-pump to block 3-main
  12H1018 Gasket-pump to block 5-main
117 51K267 Stud-pump to block
118 GHF201 Nut
119 GHF332 Washer-spring
120 GHF301 Washer-flat
121 JAM2227 Oil strainer
122 88G421 Gasket-pump to strainer
123 SH604121 Bolt-pump to strainer
124 GHF331 Washer-spring
125 51K1482 Stud-main bearing cap early
126 LNZ208 Nut-main bearing cap early
127 ACA5521 Washer-main bearing cap early
128 12B2356 Bolt-main bearing cap 18V
129 12H1368 Cork seal main cap Front/rear 18G,GA Front GB,GD,GG
  12H1476 Cork seal main cap Front/rear 18V, rear only GB to GG
130 12H865 Oil pressure relief valve
131 AEH798 Packing piece
132 1H756 Spring-oil pressure relief valve
133 6K431 Washer-oil release cap
134 12A1851 Cap-oil release valve
135 12H395 Sump 3-main
  12H3541 Sump 5-main
136 GEG503 Gasket sump 3-main
  GEG504 Gasket sump 5-main
137 88G257 Sump drain plug
138 6K638 Washer sump drain plug
139 SH604041 Bolt-sump to block
140 GHF321 Washer shakeproof
141 GHF300 Washer-plain
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