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. Engine block re-bored, honed and fitted with new pistons
- 2. Crankshaft re-ground and fitted with new main,big-end and thrust bearings
- 3. New oil pump fitted
- 4. New camshaft and cam followers (tappets) fitted
- 5. New timing chain and tensioner fitted
- 6. Peter Burgess unleaded cylinder head with all new valves and springs fitted
- 7. Re-conditioned rocker shaft assembly fitted
- 8. All new gaskets and seals
ENGINE PRICES
MGB Standard Unleaded Engine £1975.00 Exchange (inc. vat)
(Standard engine with above features)
MGB Fast Road Unleaded Engine £2875.00 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 £195.00.
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 | £1595.00 | ||
Fully rebuilt exchange 1860cc fast road engine | £2195.00 | |||
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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