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PRODUCTION CHANGES For MGA - CF-125
by Date, Chassis and Engine Numbers


Following is a list of MGA production changes. Click on the links to see related documents.

Date Topic Description Change Effective
Chassis #   |     Engine #   
Service
Memo #
May 55 First MGA,
First 15GB Engine
First MGA production engine, prefix 15GB. Not necessarily in the first MGA. Engines may be out of sequence +/-100 numbers. 10101 101
First engine not necessarily in the first car.
 
Oct 55 Engine Timing chain tensioner added, front engine plate and cover modified to match.   259  
Nov 55 Dynamo Windowless yoke type dynamo introduced   487  
Hood & Sidescreens Hood frame, canopy and sidescreens modified 10501    
Dec 55 Gearbox Gearbox rear extension oil seal modified to second type with rubber seal and felt washer instead of leather seal and felt washer.   744 CSM_MG/242
Rear Axle Handed hub nuts introduced on rear axle (disc wheel cars) 10917    
Body Word on Car No. plate changed from "Guarantee" to "Warranty" 10979-11563   RT-107A
Jan 56
Rear Axle Handed hub nuts introduced on rear axle (wire wheel cars) 11450    
Clutch Banjo deleted from clutch slave cylinder 11768    
Feb 56 Distributor Distributor type DM.2.R4 with pre-tilted contact breakers introduced (part no. 1H811), cable run modified. (New model supersedes old model for all earlier cars replacement parts).   1809  
Mar 56 Engine Gearbox mounting plate modified with oil escape recess and groove machined in front face, to prevent oil leaking on clutch.   3289  
Wipers 9-1/2” wiper arms with 8” blades introduced on LHD cars 12800    
Coupe MGA Coupe prototype 13355   VT-101C1
Apr 56 Engine Main bearings modified   3511  
Increased diameter exhaust valve throats and shorter valve guides   4046  
Harness Wiring harness, LH headlamp and flasher lead modified 13473    
Wipers 9-1/2” wiper arms with 8” blades introduced on RHD cars 13612    
Instruments New style instruments introduced 14090    
Heater Control Blower switch changed from air control knob to temperature control knob. Exact date and car number for this change are not known, but assumed to happen along with other significant changes in April 1956.     See 1st Edition of SPL and
1st Edition of Operator's Manual
May 56 Clutch Clutch withdrawal lever modified with larger diameter pivot bolt.   4525  
Engine Pushrod ends increased in diameter, tappets modified to suit.   5504  
Diameter of oil return thread to crankshaft rear main bearing reduced.   6615  
Suspension New coil springs with reduced free length 15152    
Jun 56 Engine Chromium-plated piston top rings introduced.   5682  
Vacuum pipe to distributor modified to incorporate fuel trap.   6625  
Hood Vynide hood modified, seams capped and welded after stitching 16101    
Rear axle O-ring seal added to bearing hubs; (axle)3725 for disc wheels; (axle)5225 for disc wheels; (Date uncertain. Not in SPL Jun-56, but is in SPL May-57)     WSM Sec H.10
Jul 56 Engine Improved material spec for water outlet elbow.   7538 (approx)  
Gearbox Gearbox front cover improved and oil seal fitted, with attendant changes. *(This is likely misleading, as a rubber oil seal was not introduced until much later in production).   7981  
Facia Facia panel piping modified 17220    
Instruments Speedometer and rev counter cables modified 17588    
Aug 56 Engine Connecting rods and caps modified   8570  
Sep 56 Body Sill finishers added to improve appearance 19949    
Hood Rear three-quarter lights added to hood canopy 20162    
Coupe First Coupe 20671    
Gearbox
and
Propshaft
Propeller shaft modified at front. 1-in 10-spline changed to 1-1/16-in 10-spline, and change of length. Dust cover changed from straight welded to bell shape stamping. Seal changed from external to internal type. GB rear housing, output shaft and speedo drive gear changed. 20753    
Brakes Handbrake cable sheathed with PCV to prevent water entering and retain grease 21021    
Oct 56 Gearbox Gearbox rear extension oil seal modified to third type with leather seal and leather washer   10990 CSM_MG/242
Engine Adapter for external oil pipe modified.   11298  
Vacuum pipe for distributor modified.   11301  
Rear tappet cover modified   11935  
Nov 56 Cylinder head heater outlet increased in diameter to reduce restriction in flow.   12723 CSM_MG/198
Brakes Rear wheel cylinders, banjo fitting changed from straight to right angle 22741   CSM_MG/198
Dec 56 Throttle Auxiliary return spring added to throttle cable 24594   CSM_MG/197
CSM_MG/202
Jan 57 Engine Cylinder head gasket changed from steel/asbestos to copper/asbestos.   15688 CSM_MG/205
Coupe External lock fitted to Driver's door (previously always fitted to LH door) 25110    
Internal locking door handle fitted to Driver's door (now both sides, previously only fitted to RH door) 25110   CSM_MG/202
May be an error. See addendum to CP-113
Feb 57 Clutch Stronger clutch pressure plate springs fitted to reduce clutch slip, clutch cover modified to suit.   16225 CSM_MG/205
Dynamo Dynamo pulley reduced in diameter and fan belt shortened to increase dynamo speed.   17061 CSM_MG/205
Body Bonnet lid wood batten modified 26681    
Mar 57 Engine Enlarged inlet port necks in cylinder head.   17151  
Thermostat modified.   17538
(approx)
 
Valve rocker cover joint increased in thickness to improve oil sealing.   18418 CSM_MG/205
Brakes Brake piping and rear brake banjo connections, UNF threads standardized (disc wheel cars) 27989    
Apr 57 Gearbox Improved second/third gear synchronizer   19383 CSM_MG/205
Brakes Brake piping and rear brake banjo connections, UNF threads standardized (wire wheel cars) 28540    
Body Splash plates added in front of rear wheels 29935    
May 57 Engine Copper ferrules fitted to cylinder head gasket   20501 CSM_MG/206
Jun 57 Inlet valve guides modified. Also found on engine no's 23175 to 23200 inclusive.   23448  
Style of engine number prefix changed from BP15GB to 15GB-U-H sometime
after 34231
sometime
after 24348
 
Jul 57 Gearbox Gearbox rear extension oil seal , leather type replaced by synthetic rubber type with leather washer (fourth type)   25112 CSM_MG/210
CSM_MG/242
Aug 57 Engine New type of Tecalemit oil filter, Purolator oil filter introduced as alternative, and oil filter seal modified. This change also applied to engine numbers 26661 to 26700 inclusive.   (26661-26700) and commencing 26934 CSM_MG/227
Sep 57 Pistons and rings modified   27909  
Oil dipstick min mark raised from 3/4” to 3/8” below the max mark.   28979 CSM_MG/213
Oct 57 Modified bracket for ignition coil mounting on dynamo   29710  
Oct 57 Hubs Knock-ons changed (old 81614/81615, new ATB4222/ATB4223) 40857    
Nov 57 Engine Carburettor distance pieces made from harder material and gaskets added 42613   CSM_MG/213
Dec 57 Body Smaller screen washer jets, modified control unit 45186    
Jan 58 Engine Front tappet cover and crankcase vent pipe modified   35809  
Feb 58 Heavier gudgeon pins with smaller center holes, pistons modified.   38484 CSM_MG/229
Suspension Time setting for rear shock absorbers reduced to improve ride 48674   CSM_MG/218
Hubs Knock-ons changed (old ATB4222/ATB4223, new 1B8077/1B8078) 48730    
Paint Roadster: Ash Green color introduced instead of Tyrolite Green (last Tyrolite Green roadster was 48333) 48980    
Coupe: Ash Green color introduced instead of Island Green (last Island Green Coupe was 48178) 49000    
Mar 58 Engine Water pump with one-piece bearing introduced. Also found on engine numbers 39365 to 39400 inclusive.   (39365-39400) commencing 39526  
Two holes drilled in oil cavity in cylinder block rear main bearing cap and cutaway machined in oil return housing. Drain pipe discontinued.   40106 CSM_MG/212
CSM_MG/229
Wheels Disc wheels modified in area adjacent to brake adjuster hole 50270   CSM_MG/218
Apr 58 Engine Pistons with deeper grooves and rings of increased radial thickness to decrease oil consumption.   40825  
First MGA Twin Cam, car and Engine First MGA Twin Cam car and first Twin Cam engine, start of production. TC_501 TC_101
First engine not necessarily in the first car.
 
Body Bonnet crown height increased, and internal bracing changed. Inner wings changed with new indents. (c)50979
(or earlier)
   
Jun 58 Engine, T.C. Radiator overflow pipe modified.
[except (c)575, 613, 623, 633, 648]
TC_651 TC_131 SPL 3rd ed. C.1
Possible change of camshafts and valve timing (not confirmed).   TC_141  
Thermostat with lower operating temperature   TC_194 SPL 3rd ed A.16
Packing plate added to LH engine mount to improve clearance between starting handle dog and steering rack. Air cleaners with positive filter element location, TC_528   WSM A.18
Doors, Coupe Coupe: door hinges with smaller stops to increase door opening 52916   CSM_MG/221
CSM_MG/229
Jul 58 Steering Cup and fiber washers added below grease nipples, grease escape drilled in steering ball socket cap on LHD cars 53875   CSM_MG/229
CSM_MG/233
Suspension Steering knuckles, levers and nuts modified (1/2-in UNF to 5/8” UNF) 54247    
Steering Cup and fiber washers added below grease nipples, grease escape drilled in steering ball socket cap on RHD cars 55545   CSM_MG/229
CSM_MG/233
Clutch All BMC clutch plates between 7 inch and 11 inch changed from 6 to 4 spring, interchangeable.      
Aug 58 Gearbox Gearbox rear extension oil seal, leather washer replaced by felt washer (fifth type).   45412 CSM_MG/232
Engine Modified bracket for ignition coil mounted on dynamo   45905  
Electrical Relay for twin fog lamps fitted on cars for North America 55633    
Jun 58 Sep 58 Twin Cam
Coupe
First MGA Twin Cam Coupe TC_553   Rego No. PKG1
twincam/tc107-553.htm
Sep 58 Engine Oil pump suction pipe moved forward to prevent starvation when cornering or braking. Pump strainer and studs all modified. Also applied to engine numbers 46045 to 46100 inclusive.   (46045-46100) and commencing 46342 CSM_MG/237
Engine, T.C. Smaller dynamo pulley and shorter fan belt to alter dynamo speed and increase charging rate.   TC_272 CSM_MG/237
CSM_MG/237A
Body, T.C. Roadster: detachable panels in front wheel arches for improved access TC_592   SPL 3rd ed
R.1, R.4
Coupe detachable panels in front wheel arches for improved access TC_594  
Cooling, T.C. 7lb relief valve added to overflow pipe from radiator header tank; also on cars (c)575, 613, 623, 633, 648. TC_652   CSM_MG/234
Chassis, T.C. Five holes added to front cross member for acccess to sump front bolts TC_662    
Doors, Roadster Roadster: door hinges with smaller stops to increase door opening 56069   CSM_MG/221
TC_Engine Connecting rod assemblies for replacement should not differ by more than 3 drams (5.316 grammes). Later superseded by SM MG/236 5 Nov 1958, and SM MG/252 24 Apr 1959. Assemblies not to std weight are stamped to indicate drams above or below std. Successive SMs introduced additional weight ranges. TC_652   CSM_MG/231
Layshaft oil pump gear and oil pump spindle with more teeth.   TC_313 SPL 3rd ed p1
Windscreen Windscreen hood pegs changed from plated brass to plated mild steel 57100   CSM_MG/232
Oct 58 Engine Tappet adjusting screw locknuts modified.   47901  
Engine, T.C. Layshaft oil pump gear and oil pump spindle with more teeth. Also T.C. engine no. 313.   TC_315 CSM_MG/240
Spinners Germany Octagonal spinners on cars for Germany TC_708   SPL 3rd ed p1
Instruments, T.C. Longer speedometer cable for LHD cars. Centigrade temperature gauge instead of Fahrenheit gauge on LHD cars not for North America (Twin Cam) TC_713    
Instruments LHD cars (not for North America) fitted with Centigrade temperature gauge instead of Fahrenheit gauge 57574 TC.713    
Hubs Octagonal spinners introduced on wire wheels for Germany instead of knock-ons. 57574 (approx)    
Nov 58 Engine Rocker shaft brackets modified   48911  
Engine, T.C. Pistons with twin-segment scraper ring to reduce oil consumption.   TC_446 CSM_MG/240
CSM_MG307
CSM_MG325
Dynamo adjusting link changed.   TC_448  
Pedals Brake pedal modified. Clutch pedal on LHD cars modified. 58713    
Headlamps European export cars (except France and Sweden) fitted with asymmetrical headlamps; rim fixing screws and adapter modified 58918 TC.824    
Brakes, T.C. Modified disc brake caliper units (Twin Cam) TC_836   TC_SPL 3rd ed H.3, K.2
Suspension Front spring spigot increased in diameter to eliminate spring noise 58996 TC.842   CSM_MG/240
Dec 58 Engine, T.C. Ignition cables lengthened and re-routed round front of cylinder head.   TC_556  
Water inlet pipe straightened   TC_574  
Water inlet elbow lengthened   TC_581  
Modified top ring to pistons to overcome piston noise.   TC_606 CSM_MG307
CSM_MG325
Cylinder block rear side cover breather pipe modified to prevent oil leaking onto exhaust system.   TC_657  
Headlamps France Asymmetrical headlamps introduced on cars for France 60340    
Tonneau Cover Tonneau cover, LHD cars: fasteners deleted from door tops, zip lengthened, steering wheel bag deleted. 60637 TC.994    
Brakes T.C. Brake master cylinder box and strengthening plate modified (Twin Cam) TC_997   article TC-206
Gearbox & Propshaft New propshaft with flanged input and sliding spline. Gearbox modified with flanged output (still low starter). Only some cars until car #61504. *(This would be a very rare gearbox with low starter and flanged output). 61037    
Jan 59 Pedals Clutch pedal on RHD cars modified. 61100    
Heater Heater water valve improved design 61160    
Last 15GB Engine Final engine number in 15GB series   51767  
First 15GD Engine
Gearbox,
Propshaft
Body
Introduction of 15GD series engine, no blanking plate for mechanical fuel pump, high starter. Gearbox modified with high starter and flanged output (mounting plate, casing and rear extension). Gearbox cover (on tunnel) with rubber cover for Bendix drive (in cockpit), RH toe board and carpet modified to suit. LHD cars only: speedo cable 3-in longer to clear starter. New propshaft with flanged input and splined sliding joint at front. (Also cut-out in the high crown bonnet internal brace to clear front SU carburetor on the Twin Cam engine). 61504 101
First engine not necessarily in the first car.
 
Electrical Wiring harness connections to stater switch and starter motor modified. 63435    
Wheels New disc wheels, stronger but lighter. New wheels supersede old model for replacement parts on earlier cars. Optional Rimbellishers discontinued. New optional Ace Mercury wheel discs. 63577   CSM_MG/25
Feb 59 Tonneau Cover Tonneau cover, RHD cars: fasteners deleted from door tops, zip lengthened, steering wheel bag deleted. 64332    
Engine, T.C. Tappets increased in length by 0.25in to 1.5in to eliminate risk of fractures   TC_1087 CSM_MG/253
Mar 59 Connecting rods modified with bosses at small end for balancing purposes. Heavier big end bearing caps.   TC_1343 CSM_MG/231
CSM_MG/236
CSM_MG/252
CSM_MG/262
Gearbox, T.C. Close ratio gearbox introduced as an option. When fitted with this gearbox, engine prefix should be 16GB-Da.   TC_1379  
Headlamps France, T.C. Asymmetrical headlamps introduced on cars for France (Twin Cam) TC_1618    
Knock-ons, T.C. Knock-ons of bronze introduced instead of steel knock-ons (Twin Cam) TC_1826    
Apr 59 Accessories Battery covers made available as optional extras.     CSM_MG/249
Engine, T.C. N.3 spark plugs introduced to reduce heat at piston crown. (21-Apr-59)   TC_???? CSM_MG/253
CSM_MG/282
CSM_MG/288
Cast iron sleeves introduced for tappet bores in cylinder head to reduce wear.   TC_1587  
Engine Connecting rod bearings modified   6530  
Rear Hub, T.C. Rear hub extensions modified (Twin Cam) - Identified by either thin or thick casting behind knock on thread. Was AJC5182/3, became ATB7252/3 TC_1840    
Frame,
Suspension
Chassis front extension and front suspension spring pan assemblies modified to permit installation of optional anti-roll bar (not T.C. at this time) 66574    
May 59 Sun Visor, T.C. Coupe: New type optional sun visor (T.C. only at this time) TC_2061    
Last 1500, Last 15GD Engine Last MGA 1500. Final engine number in 15GD series. 68850 7816  
First 1600 First MGA 1600.
Chassis: New 1588cc engine type 16GA; gearbox modified to prevent disengagement of third gear; front disc brakes. Half shafts and differential wheels with (26) involute splines (T.C. not until July)
Body: larger sidelamps/indicators with modified front wings; separate rear indicators and new tail lamp plinths; flasher relay deleted; new sliding sidescreens with new fixing nut, additional hood latch on windscreen (roadster); new range of colors for paint, trim and hood; new series of body numbers prefixed with B.
Coupe: Spare wheel relocated in boot with new rear bulkhead and (narrower) rear window shelf.
Dipswitch: on LHD cars repositioned for easier operation.
68851    
First 16GA Engine First MGA 1600 engine type 16GA; gearbox modified to prevent disengagement of third gear.   101
First engine not necessarily in the first cer.
 
Jun 59 First 1600 style T.C. Coupe First “1600 style” Twin Cam Coupe. Body specifications as for first 1600 Coupe. 2189, 2190, 2191, 2192 were built as CKD cars in South Africa, so build completion may have been later. These cars were incorrectly recorded as roadsters. TC_2189    
First 1600 style T.C. Roadster First “1600 style” Twin Cam roadster. Body specifications as for first 1600 roadster. TC_2193    
Disc Brakes & Disc Wheels Front disc brake studs replaced by bolts on disc wheel cars (non T.C.) 69505    
Frame & Suspension T.C. Chassis front extension and front suspension spring pan assemblies modified to permit installation of anti-roll bar, which was immediately standard on the Twin Cam model only. (non T.C. was done in April) TC.2275   CSM_MG/278
Headlamps Cars for USA fitted MK VIII sealed beam headlamps with modified gasket integral with dust excluder 70222 TC.2278    
Dipswitch, T.C. Dipswitch on LHD cars repositioned for easier operation (non T.C. was done in May) TC_2281    
First 1600 style T.C. Coupe First 1600 style Twin Cam Coupe. Body specifications as for first 1600 Coupe. TC_2292    
Disc Brakes, Wire Wheels Front disc brake studs replaced by bolts on wire wheel cars 70276    
Jul 59 Engine, T.C. Shorter carburetor damper pistons for improved even running and maximum speed. These cars are identified by the carburetor caps being stamped 'O'.   TC_???? CSM_MG/264
Pistons with modified scraper ring and expander ring added. These were also fitted to a few earlier engines.   TC_2057 CSM_MG/278
CSM_MG307
CSM_MG325
Pressure Cap Radiator filler cap changed from 4-lb to 7-lb to prevent boiling. New part supersedes old model and should be fitted to all earlier cars. 71832   CSM_MG/289
Halfshaft Splines T.C. Half shafts and differential wheels with (26) involute splines (non T.C. Done in May) TC_2371   CSM_MG/278
Headlamps, Sweden Cars for Sweden fitted with asymmetrical headlamps 72040 TC_2418    
Aug 59 Engine Thermostat modified.   4788  
Engine Float chamber mounting modified from banjo bolt to double threaded stud and nut. Parts interchangable as a set.

Date of change unknown, but thought to be during early 1600 production.

Refer to article: CB-111A
Electrical Dynamo type C.40/1 introduced, control box modified, harness with Lucar snap connectors for dynamo and control box. New fan belt. New ignition coil bracket. 74489 6272  
Sep 59 Dynamo pulley and fan belt modified.   6396  
Instruments Speedometer cable modified on RHD cars 74979 TC_2467    
Engine, T.C. Air cleaners modified to incorporate venturi. (T.C. Only) TC_2468   CSM_MG/286
Oct 59 Engine Dipstick cranked away from crankcase for better accessibility.   9649 CSM_MG/294
Brake Pads Disc Wheels Front disc brake pads improved material on disc wheel cars 78106   CSM_MG/290
Brake Pads Wire wheels Modified Hood, Hood Frame, Battery Hatch, Sidescreen Stowage Bag 78114   CSM_MG/290
Hood & Frame, Battery Hatch, Stowage Bag Hood frame and canopy modified. New sidescreen stowage envelope and modified battery hatch to enable hood to be stowed under rear tonneau panel with sidescreens stowed on top of battery hatch, and improved seating adjustment 78249   CSM_MG/294
Nov 59 Hood frame and canopy modified. Same as for 1600 cars, above (Twin Cam) TC_2540   CSM_MG/294
Mirror,
France
Rear view mirror with safety rim fitted on cars for France 79663    
Body
(non T.C.)
Windscreen wiper wheelbox modified 80284    
Body Windscreen washer bottle, bottle neck increased in diameter from 1-1/2” to 2-3/16”, control module modified 80390 TC.2544    
Body, T.C. Windscreen wiper wheelbox modified TC.2545    
Dec59 Body Coupe: New type optional sun visor (T.C. was done in May 59 at (c) 2061) 81532    
Differential Splines Half shafts, differential wheels and assembly modified on wire wheel cars, 25 spline (was 26 spline) 82749    
Half shafts, differential wheels and assembly modified on disc wheel cars, 25 spline (was 26 spline) 82892    
Gearbox Gearbox front cover bosses modified   12834  
Engine, T.C. Tappets modified   TC_2211  
Jan 60 New type distributor less vacuum unit, to prevent over-advancing with possible consequent piston failure. Supposedly retrofitted by campaign change to all earlier cars. Concludes with car/chassis 2561   TC_2222 CSM_MG248
CSM_MG282
CSM_MG288
CSM_MG301
Gearbox, T.C. Gearbox front cover bosses modified   TC_2228  
Mar 60 Engine, T.C. Alternative low compression pistons (8.3:1) introduced, with resulting decrease in power from 108bhp to 100bhp. High and low compression pistons fitted with plain instead of chromium-plated top rings. Stronger valve springs fitted. TC_2609 TC_2251 CSM_MG307
CSM_MG310
CSM_MG325
CSM_MG/34
Crankshaft main bearings and big end bearings of lead-tin type introduced as alternatives.   TC_????  
Radiator Cap Radiator filler cap modified 88192    
Number Plate Number plate lamp, 2 bulbs instead of one 88844    
Apr 60 Engine Exhaust valves of improved material   20846  
Connecting rods with thicker webs, bearing caps modified.   21705  
Crankshaft modified to increase oil return scroll clearance to cylinder block. Introduction of VP3 lead-indium main bearings in place of white metal.   21805 CSM_MG/327
Competition Suspension Four-wheel Dunlop disc brakes and center-lock disc wheels introduced as option, with related changes (the “Deluxe” model). Requires different accellerator pedal and cross shaft assembly for LHD cars, and mounting ignition coil on top of generator. Requires separate clutch and brake master cylinders, different clutch pedal and slave cylinder and related fittings, different steering rack (slightly farther forward), different steering arms, hub assemblies, front wheel bearings, brake calipers and rotors at all four wheels. In short, it is a complete Twin Cam chassis with pushrod engine and a hybrid body shell (except apparently the sway bar was optional, not standard equipment). 91240   CSM_MG/327
May 60 Engine, T.C. Estimated final Twin Cam engine number   TC_2272  
Number Plate Special number plate lamp on cars for Switzerland 92679    
Fuel Pump Rubber cover for fuel pump discontinued 93225    
Last T.C. Last MGA Twin Cam TC_2611    
Jun 60 Engine Thicker, stiffer cylinder block side covers to reduce the possibility of oil leaks.   25740 CSM_MG/337
Jul 60 Tool Kit Tool kit reduced, new type Shelley ratchet jack 93548    
Aug 60 Sidescreens Sidescreen rear flap removed and hood valance modified to improve waterproofing, on cars with GRAY hood/sidescreens. 96269   CSM_MG/337
Sidescreen rear flap removed and hood valance modified to improve waterproofing, on cars with BEIGE hood/sidescreens. 96806   CSM_MG/337
Sidescreen rear flap removed and hood valance modified to improve waterproofing, on cars with BLUE hood/sidescreens. 97104   CSM_MG/337
Mar 61 Engine Exhaust valve outer springs modified.   31640  
Last 1600,
Last 16GA Engine
Last MGA 1600. Final engine number in 16GA series. 100351 31660  
First 1600 Mark II,
First 16GC Engine
First MGA 1600 Mark II. New 1622cc engine type 16GC; new distributor type DM.2 with rolling weight centrifugal advance mechanism. Gearbox casing modified, welch plugs deleted.
Body: New radiator grille; new combined stop/tail lamps and rear indicators on horizontal plinths (with silver/gray rubber gasket) below boot lid; 4.1:1 rear axle ratio standard; seat belt mounting points added; Facia now covered in Vynide on roadster, scuttle on roadster and coupe covered in Novon. Turn signal warning lamp relocated from 10 o'clock to 2 o'clock relative to the the T/S switch, and the depression in the dash deleted. Optional paint colors and interior colors changed.
100352 101
First engine not necessarily in the first car.
 
Engine Low compression engine pistons modified   127  
Apr 61 Facia Piping, Coupe Coupe: On white cars with black trim, piping color for black facia trim roll changed from white to black; 100596    
Fuel Pump Fuel pump specifications upgraded from AUA 54 to AUA 154 100612

May 61 Engine Low compression engine distributor modified   1012
Body Rear lamp plinth gasket replaced by cream Prestik 101353    
Roadster: Modified door seal finishers on shut pillars, and change shutface panels to incorporate "rain gutter" raised edge 101292    
Steering Lock, Sweden Steering lock fitted to cars for Sweden      
Jun 61 Facia Piping, Roadster Roadster: On white cars with black trim, piping color for black facia trim roll changed from white to black; 101490    
Dynamo, Control Box, Compression, Police Cars Police cars: C42 dynamo and RB340 control box introduced. Low compression engine standardized on police cars. 101840    
1_Jul 61 Steering Lock, Germany Steering lock fitted to cars for Germany      
Jul 61 Engine Oil gallery plugs commonalised. Also on engine numbers 2157 to 2225 inclusive.   2327  
Body Two distance pieces added to rear bumper brackets to bring bumper further away from body, so to avoid risk of rear number plate fouling body. 102381    
Brakes Dust covers added to front disc brakes on standard model with disc wheels. 102589    
Body Six (6) sealing plugs added to boot floor 102737    
Oil Cooler Coupe Oil cooler fitted as standard on export cars (coupe models)
Headlamps Headlamps on cars for USA changed from Mark VIII type to Mark X type 102857    
Brakes Dust covers added to front disc brakes on standard model with wire wheels. 102929    
Aug 61 Oil Cooler Roadster Oil cooler fitted as standard on export cars (roadster models) 102950    
Tires Nylon tires introduced as standard, except on cars for Germany 103192    
Sep 61 Engine Lightened flywheel introduced.   3708  
Brakes Modified disc brake caliper dust seal on disc wheel cars 103261    
Steering Common type Neiman steering lock fitted to cars for Germany and Sweden 103759    
Brakes Modified disc brake caliper dust seal on wire wheel cars 103834    
Oct 61 Gearbox Gearbox first motion shaft with involute splines formed by rolling, giving stronger spline section at reduced cost; clutch driven plate modified to suit. 104022 (HC)
104469 (LC)
3929  
Engine High compression engine distributor modified.   4004  
Nov 61 Gearbox Gearbox casing of thicker section around bellhousing and incorporating stiffening ribs to reduce vibration. Longer bolts between bellhousing and engine.   4748  
Dec 61 Reverse gear assembly modified.   5403  
Exhaust Switzerland Exhaust system with twin silencers on cars for Switzerland 104805    
Headlamps Headlamps with skirted gasket with integral dust excluder, separate dust excluder deleted on UK and RHD export cars (and LHD cars not for Europe/USA) 105362    
Jan 62 Starter Starter motor modified.   6435  
Feb 62 Headlamps Canada USA-type sealed beam headlamps fitted on cars for Canada 107031    
Apr 62 Engine Crankshaft front oil thrower and front pulley modified. Engine front cover modified, felt oil seal replaced by rubber oil seal.   8263  
High compression engine distributor and cover modified.   8422  
May 62 Last Coupe Last coupe 107031    
Last MGA,
Last 16GC Engine
Last MGA 1600 MK II. Last engine number in 16GC series. 109070 8851  
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