Bentley Mk VI Chassis Info
The chassis number for these models is composed of an initial fixed letter 'B', followed by a number that can go from 1 to 601. Finally two letters of which the first one determines the series of the model.
Usually the chassis number for these models can be found on the firewall
| Release Date | Chassis Number | Modification Detail | Introduced at Chassis: |
| Nov 1946 - Jul 1947 | B2AK to B254AK | Servo Damper | B70AK |
| Apr 1947 - Oct 1947 | B1AJ to B247AJ | Squirt hole in connecting rods | B126AK |
| Shock absorber screwed inserts | B250AK | ||
| Twin ignition coils, parkerised tappets | B1AJ | ||
| Hardened push rods | B31AJ | ||
| Modified horn push button | B185AJ | ||
| Jun 1947 - Jan 1948 | B2BH to B400BH | AC air cleaner, SC carburetter needles, strengthened wheel disc flange | B2BH |
| Sep 1947 - Mar 1948 | B1BG to B401BG | Heater return tap deleted, heater drain tap added | B70BH |
| Provision for 5" dynamo | B112BH | ||
| Rocker cover breather | B198BH | ||
| Modified interior door locks | B228BH | ||
| Increased synchro cam angles | B292BH | ||
| Modified distributor drive, spring ring, increased front shock absorber | B398BH | ||
| Loading | B185BG | ||
| Nebar rocker cover joint | B303BG | ||
| Export body modifications | B321BG | ||
| Dec 1947 - Aug 1948 | B2CF to B500CF | Aluminium tappet doors, large rear hub bearing | B2CF |
| Mar 1948 - Dec 1948 | B1CD to B501CD | Bronze exhaust valve guides | B26CF |
| Modified clutch thrust race | B164CF | ||
| Solid door striker plates | B206CF | ||
| Horn suppressor | B218CF | ||
| Dunlop jacks | B236CF | ||
| Wider opening radiator shutters | B320CF | ||
| 2.4" servo balance lever | B344CF | ||
| 5" dynamo | B426CF | ||
| C. & A. cylinder head gasket, accelerator countershaft guard | B1CD | ||
| 13° brake expanders, 25° servo cams | B17CD | ||
| Modified coolant pump | B115CD | ||
| Improved rubber door seals, servo protection plate | B347CD | ||
| Modified quicklift window stop | B363CD | ||
| Extended petrol tank breather | B475CD | ||
| Jul 1948 - May 1949 | B2DA to B500DA | Low lift camshaft, Lucas screen wipers, modified core plugs | B2DA |
| Oct 1948 - Jan 1949 | B1DZ to B501DZ | Oil caps in No.7 journal | B62DA |
| Bench type spring drive | B128DA | ||
| Longer upper triangle levers | B134DA | ||
| Short cylinder inserts | B144DA | ||
| Rear shock damper linkage modification | B200DA | ||
| Battery charging plug | B252DA | ||
| Larger frontal area radiator, anti-spill valve in radiator | B270DA | ||
| Chromium-plated servo plate | B384DA | ||
| Strengthened door hinges | B420DA | ||
| Increased diameter scuttle drain | B492DA | ||
| 3/8 in. cylinder studs | B95DZ | ||
| N.S. front window winder | B117DZ | ||
| Improved window run channels | B131DZ | ||
| Square edge bearings, 1st and 3rd mot. shafts | B150DZ | ||
| Strengthened 3rd mot. shaft splines | B159DZ | ||
| 8 1/2" deflection front springs, radiator heated de-mister, dip and switch headlamps | B193DZ | ||
| Modified underseat heater, export features on all cars, fixed guide to front windows | B237DZ | ||
| 22 1/2° servo cams, 3" balance levers | B241DZ | ||
| Heater return tap re-introduced | B273DZ | ||
| Revised inter-shoe brake linkage | B493DZ | ||
| Feb 1949 - Nov 1949 | B2EY to B500EY | Split skirt pistons | B2EY |
| Jun 1949 - Feb 1950 | B1EW to B501EW | Granodised piston rings | B120EY |
| Portable hand inspection lamp | B162EY | ||
| Luggage boot water trap | B264EY | ||
| Progressive bump stops | B466EY | ||
| 3/8 in. dia. rear axle bolts | B1EW | ||
| Closer fitting tappets | B57EW | ||
| Commonised dash | B273EW | ||
| Forged rear spring shackle bracket | B403EW | ||
| Sep 1949 - Mar 1950 | B2FV to B500FV | Internal oil feed to distr. | B2FV |
| Dec 1949 - Jul 1950 | B1FU to B601FU | Longer gear lever | B138FV |
| Modified rear s.d. plates | B444FV | ||
| Trico windscreen washer | B1FU | ||
| Modified s.s. tube socket | B244FU | ||
| Modified x.s. tube sockets | B281FU | ||
| Apr 1950 - Sep 1950 | B1GT to B401GT | Revised steering geometry, thicker lipped brake drums, anti-rumble brakes | B1GT |
| 2nd mod to rear s.d. plates | B67GT | ||
| Four foot mounted air silencer | B111GT | ||
| Improved rear no. plate box, revised bijur pipes to rear shackles | B165GT | ||
| Reduced speed fan | B213GT | ||
| Keyhole sockets on gear control | B281LGT | ||
| One piece rear brake equlever | B381GT | ||
| Jul 1950 - Jan 1951 | B2HR to B250HR | Aluminium cam wheel, electric clock, low rate oil feed to clutch thrust, 11" clutch (light type), 3 bush rear brake equ-support, mod. starter solenoid switch | B2HR |
| Jul 1950 - Mar 1951 | B1HP to B251HP | Lower bush r.s.d. link deleted | B11HR |
| Speedo dip warning light | B31HP | ||
| Large bore carburetters, mod. clutch spigot bearing | B83HP | ||
| Closer fitting 2nd & 3rd speed bushes | B95HP | ||
| Triple pass de-mister inter. scheme | B149HP | ||
| Longer bosses on r.s.d. plates | B179HP | ||
| Sep 1950 - Feb 1951 | B2JO to B250JO | Thicker r.s.d. plates | B2KM |
| Nov 1950 - May 1951 | B1JN to B251JN | Mod. water pump gland ring | B61JN |
| Jan 1951 - Jul 1951 | B2KM to B200KM | Triple pass r.h. de-mister (final) | B2KM |
| Feb 1951 - Dec 1951 | B1KL to B201KL | Modified ammeter | B64KM |
| New type ignition condenser | B117KL | ||
| Mar 1951 - Sep 1951 | B2LJ to B400LJ | Steel oil caps in crankshaft | B40LJ |
| May 1951 - Dec 1951 | B1LH to B401LH | Oil feed adaptor air bottle | B170LJ |
| 11" heavy type clutch | B300LJ | ||
| Jul 1951 - Jan 1952 | B2MD to B400MD | 3 5/8 in. bore engine, thickened crankshaft webs, full flow oil filter, twin exhaust system (r.h. cars only) | B2MD |
| Sep 1951 - Feb 1952 | B1MD to B401MD | Side scuttle ventilators | B29MB |
| Insulated dynamo | B313MB | ||
| Nov 1951 - May 1952 | B2NZ to B500NZ | Increased front damping | B210NZ |
| Feb 1952 - Sep 1952 | B1NY to B501NY | Twin condensers | B292NZ |
| Sp carb. needles (r.h. cars only) | B478NZ | ||
| Short dwell detent on 1st gear selector | B500NZ | ||
| Repositioned oil gauge conn. on crankcase | B123NY | ||
| Stiffened clutch casing | B253NY | ||
| 3-position heater and de-mister switches, 120° opening ventilator windows, rear window de-mister | B311NY | ||
| Apr 1952 - Jul 1952 | B2PV to B300PV | Reversion to old type front wheel studs | B22PV |
| B1PU to B301PU | Solid pins and shield on servo | B284PV | |
| Hot and cold de-mister | B53PU | ||
| Exhaust heat shields | B159PU | ||
| Needle rollers in clutch release levers | B185PU | ||
| Reduced friction on steering connections | B215PU |
