This section contains memos issued by BMC Service Ltd to MG dealers, detailing actions to be taken when servicing the MGA cars. These are PDF files averaging 80KB per page.

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See also Twin Cam Confidential Service Memoranda in the Twin Cam section
*  - Applicable to all MG models, not specific to MGA
** - Applicable specifically to MGA Twin Cam Model

Index to Improvements and Alterations February 1961 (450-KB pdf file)

 Date  CSM no Subject Matter      
(Dec'56)MG197 Accelerator return spring retrofit before (c)24594. (See CSM MG202 and the SPL for parts required).
03Jan57 MG198 Cylinder head heater outlet - Wheel cylinder banjo connections, rear brakes
07Mar57 MG202 Accelerator return spring (c)24594 Dec 1956 - Door locks coupe (c)25110 Jan 1957 - Hand brake cable (c)21021 Sep 1956
18Apr57 MG203 Noisy heater
22May57   NASB 20 (Volume 4) - M.G.A. Fixed Head Coupes - Door Hinge Shims
23May57 MG205 Dynamo pulley and belt - Synchronizer, 3rd gear - Cylinder head gasket - Rocker cover gasket - Clutch springs
15Aug57 MG206 Cylinder head gasket
03Oct57 MG210 Gearbox rear oil seal
11Dec57   NASB 38 (Volume 4) - Rear Hub Baffle
19Dec57 MG212 Rear main bearing oil leaks (scroll seal clearance)
13Feb58 MG213 Oil dipper rod - Carburetor distance piece and gasket
13Feb58 MG214 Steering joint slackness
13Feb58 MG215 Windscreen washer loss of water
13Mar58 MG216 Replacing damaged hood backlight
01May58 MG218 Rear shocks - Road wheels
06May58 MG219 Door latch cables
21May58 MG221 Insufficient door opening, coupes
21Jul58 MG226 Clutch driven plates *
01Aug58 MG227 Full flow oil filter
10Sep58 MG229 Gudgeon pins - Steering ball sockets - Bearing caps
22Oct58 MG231 Connecting rod assemblies **
22Oct58 MG232 Gearbox rear extension oil seal - Windscreen pegs
23Oct58 MG233 Steering ball socket
11Oct58 MG234 Water loss **
13Nov58 MG235 Master cylinder and wheel cylinder seals *
05Dec58 MG236 Connecting rod assemblies (Cancels MG231) **
05Dec58 MG237 Oil pump & strainer, Petrol pipe clips, Fan belt dynamo pulley *
_______ MG237A Fan belt dynamo pulley (Corrected) **
13Feb59 MG238 Fuel octane requirements **
09Feb59 MG239 Adhesives *
06Feb59 MG240 Front spring spigot, piston scraper rings, oil pump drive spindle *
18Feb59 MG241 Jumping out of gear
20Feb59 MG242 Oil seals, gearbox and rear extension
19Mar59 MG245 Valve guides - Oversize in replacement engines *
03Apr59 MG246 Rear axle hub gasket
13Apr59 MG248 Distributor clamping **
17Apr59 MG249 Battery covers *
28Apr59 MG251 Fitting camshaft bearing caps **
29Apr59 MG252 Connecting rod assemblies (Cancels MG236) **
13May59 MG253 Improved Road Wheels, Tappets, sparking plugs *
16Jun59 MG257 Timing cover gasket **
18Jun59 MG258 Carburetor piston icing
29Jun59 MG259 Valve guides - Oversize in replacement engines (Cancels MG245) *
06Jul59 MG261 Bumper bar protection *
03Jul59 MG262 Important modifications - Connecting rods **
24Jul59 MG264 Carburetor damper piston **
29Jul59 MG267 Flywheel dowels *
07Aug59 MG269 Jamming in gear
27Aug59 MG275 Crankshaft, flywheel and clutch assemblies **
15Sep59 MG276 Tappet clearance **
15Sep59 MG278 Important modifications - Axle shafts, anti-roll bar assembly, piston rings *
16Oct59 MG282 Remedies for possible complaints **
10Nov59 MG286 Air cleaner venturi **
13Nov59 MG288 Remedies for possible complaints (Cancels MG282) **
25Nov59 MG289 Radiator cap
25Nov59 MG290 Disc brake pads
07Dec59 MG291 Block drain tap
06Jan60 MG294 Hood folding - Oil level indicator *
28Jan60 MG296 Piston failure **
10Feb60 MG297 Gearbox front cover centralizer *
24Feb60 MG301 Campaign change of distributor **
08Mar60 MG304 Steering wheel remover *
09Mar60 MG305 Slush penetration, brakes
23Mar60 MG307 Piston rings **
25Mar60 MG309 Main and con-rod bearings *
30Mar60 MG310 Valve springs **
08Apr60 MG313 Disc brakes
27Jul60 MG324 Control box *
16Aug60 MG325 Piston Failure **
30Aug60 MG327 Crankshaft bearings, Carburetors, All wheel disc brakes
 Jan'80 MG327n Notes from John Twist re: All wheel disc brakes changes
29Sep60 MG328 Timing chain tensioner
29Sep60 MG329 Windscreen contamination *
05Oct60 MG330 Undersealing *
06Oct60 MG331 Brake pipe unions *
18Oct60 MG332 Disc brake pads *
04Nov60 MG335 Oil filter elements - washing in petrol *
10Nov60 MG337 Hoods - Block side covers
22Nov60 MG338 Hard top and sliding sidescreens *
04Jan61 MG341 Bonnet safety *
04Jan61 MG342 Control box (Cancels MG324) *
19Jan61 MG344 Piston failure (Cancels MG325) **
08Feb61 MG346 Tyre balance
08Feb61 MG347 Starter brush springs *
09Mar61 MG355 Carburetor icing
24Mar61 MG358 Scratches on flexible back-lights *
01Aug61 MG377 Service tools *
17Nov61 MG385 Seat belts *
06Feb62 MG394 Hood sealing (Cancels MG365) *
02Jul62 MG398 Windscreen re-glazing (convertibles only) *
01Mar63 MG416 Crankshaft thrust washers *

*  - Applicable to all MG models, not specific to MGA
** - Applicable specifically to MGA Twin Cam Engine