BENTLEY S-TYPE
The chassis number for these model its composed of an initial fixed letter which is B, followed by a number that can go from 1 to 651 and finally two letters of which the first one determines the series of the model.
Depending on the first letter of the last two letters of your chassis number you can determine what series your car is and look up any modifications done through the range.
(Left hand drive models have an L preceding the last two letters)
choose your series
| Release dates | Car model | Chassis number | Modification | Modification introduced at |
| Apr. 55 to Nov. 55 | S-Type | Increased diameter rear engine mounting bolts and modified bracket | B268AN | |
| Sep. 55 to Feb. 56 | B1AP to B501AP | Modified butterfly valve and countersunk screws, SU carburetter | B270AN | |
| Introduction of thick washer under fulcrum bracket bolt lock plate to compensate for distortion of lugs on front pan | B296AN | |||
| Steering ball joint castle nuts with increased bearing surface | B340AN | |||
| Front Spring support plate with welded on stabiliser bracket attachment | B430AN | |||
| Modified bosses to increase strength of rear axle tube | B476AN | |||
| Increased friction on brake shakeback stops and increased load on servo return spring | B492AN | |||
| Improved sealing between windscreen washer and wiper mounting and body | B492AN | |||
| Setscrews in place of studs for main bearing caps | B39AP | |||
| Improved water and oil mist sealing on servo | B41AP | |||
| Strengthened spring support plates on front suspension | B87AP | |||
| Modified rear loom to cut out brake light on side on which flasher is in operation | B155AP | |||
| Modified flanges on exhaust fittings | B257AP | |||
| Brake wheel cylinder material changed from aluminium to cast iron | B273AP | |||
| Filter in brake fluid supply tank | B287AP | |||
| Stronger clamps for rear anti-roll bar | B341AP | |||
| Provision of drag links with greater resistance to kinking under compression | B383AP | |||
| Modified type of rear engine mounting | B411AP | |||
| Dec, 55 to Mar. 56 | S-Type | B2BA to B250BA | Introduction of aluminium brake master cylinder | B20BA |
| Feb. 56 to Apr. 56 | B1BC to B251 BC | Modified push button and door handle | B158BA | |
| Increased number of fixing holes in rear axle tube | B198BA | |||
| Folding arm rests in front seats | B210BA | |||
| Steering lever with taper roller bearings in place of bushes | B51BC | |||
| Strengthened front suspension fulcrum bracket | B109BC | |||
| Modified shakeback stop on front and rear brake assemblies | B115BC | |||
| Dual brake master cylinders | B245BC | |||
| Apr. 56 to Jul. 56 | S-Type | B2CK to B500CK | Radiator and drain tap suitable for revised frame | B60CK |
| Jul. 56 to Nov. 56 | B1CM to B501CM | Modified sealing ring, centre steering operating lever (P.A.S.) | B178CK | |
| Modified dynamo and voltage regulator | B188CK | |||
| Welded frame stiffeners on each side of jacking bracket | B218CK | |||
| Introduction of copper petrol pipes | B326CK | |||
| Reach nut and washer to suit new spot facing of ball and trunnion joint body, output shaft to prop. shaft | B352CK | |||
| Uphill run pipes from twin master cylinders to supply tank | B376CK | |||
| Revised frame (splayed ends) | B27CM | |||
| Reversal of power cylinder mounting bolt (P.A.S.) | B262CM | |||
| Sep.56 to Nov. 56 | S-Type | B2DB to B350DB | Introduction of 18,7 steering ratio on left hand drive cars | B46LDB |
| Oct. 56 to Jan. 57 | B1DE to B351DE | Increased number of fixing holes in rear axle centre casing | B122DB | |
| Voltage regulator with swamp resistance (H type) | B25DE | |||
| Introduction of oil deflector plate in rear shock damper | B249DE | |||
| Jan. 57 to Jul. 57 | S-Type | B2EG to B650EG | Strengthened front shock damper body (introduction of sleeve in mounting bolt bore) | B170EG |
| Jul. 57 to Dec. 57 | B1EK to B651EK | Stronger front shock damper | B316EG | |
| Combined inertia and starter ring modified starter drive and stiffened clutch casing | B530EG | |||
| Stronger fulcrum pin axle yoke | B542EG | |||
| New trim pad clips and retainers | B544EG | |||
| Improved propeller shaft centring button | B562EG | |||
| 2:1 ratio dynamo pulley | B628EG | |||
| Stiffened cam wheel | B41EK | |||
| Improved type door seals | B101EK | |||
| 4-Point fixing of number plate and reversing lamp | B133EK | |||
| Modified rear axle shaft flange | B243EK | |||
| 8:1 compression ratio engine | B257EK | |||
| Dunlop P.AS. expansible hose, alternative t Chrysler | B375EK | |||
| Nov. 57 to Jun. 58 | S-Type | B2FA to B650FA | Modified stub axle yoke seal | B377EK |
| Jun. 58 to Mar. 59 | B1FD to B651FD | Stronger drag links | B379EK | |
| Modified ashtray finisher | B389EK | |||
| Strengthened door hinges | B471EK | |||
| Introduction of shock dampers with increased size end cover studs | B555EK | |||
| Introduction of ‘Roto’ finished pulleys | B627EK | |||
| Introduction of strengthened adjusting sleeve, steering cam D.R.3 windscreen wiper motor | B365EK | |||
| Stronger rear stock damper link bushes | B54FA | |||
| Deletion of idler lever lubrication pipe | B136FA | |||
| Modified rear silencer mounting to prevent burning mounting rubber | B338FA | |||
| lntermediate heater and demister contols | B350FA | |||
| Introduction of 6” drive pulley, compressor clutch ("R.R" interior cooling) | B186FA | |||
| Improved front door ventilator sealing | B388FA | |||
| Wire type clips on propeller shaft grease seal | B438FA | |||
| Improved type rear brake expander wedges | B454FA | |||
| Final type modified stub axles | B458FA | |||
| Twin jet. centrally mounted windscreen washer | B472FA | |||
| Improved propeller shaft seal | B352FA | |||
| Grease lubricated track rods | B556FA | |||
| Improved window channel guides to ease opening in adverse weather | B556FA | |||
| Large diameter rear axle shaft splines | B590FA | |||
| Grease lubricated centre steering | B664FA | |||
| Enlarged shakeback stop slot In brake shoe web | B43FD | |||
| Modified run of hand brake cable | B45FD | |||
| Strengthened front hubs | B65FD | |||
| C.48 dynamo | B71FD | |||
| Introduction of plain washers at each end of pivot distance piece on braking system direct and intermediate linkage | B129FD | |||
| Improves type of horn footswitch (optional) | B159FD | |||
| Replacement of .250” dia. wing and valance plate bolts and screws with .3125” dia. | B359FD | |||
| Modified door handles with button sealing | B433FD | |||
| Sun visor with improved driver’s vision | B457FD | |||
| Free wheeling boot lock, Deletion of check valve In brake fluid supply pipes | B513FD | |||
| Increased capacity boot type refrigeration | B579FD | |||
| Modified window channels to reduce winding loads under adverse weather conditions | B607FD | |||
| Thermal conductor type water temperature gauge | B637FD | |||
| Modified window regulator handle to prevent fouling of trim pad | B645FD | |||
| Simplified starter relav mounting, Special battery lid for export cars | B649FD | |||
| Feb. 59 to Apr. 59 | S-Type | B1GD to B125GD | Seal between bearing housing and body front shock damper | B35GD |
| Mar. 59 to May 59 | B2GC to B126GC | Modified form of front brake shoe link, extended neck on propeller shaft seal | B4GC | |
| Modified heater and demister connections on radiator | B24GC | |||
| R.L. headlight unit | B22GC | |||
| Modified clips in electric window winder fuse box | B118GC | |||
| Introduction of purolator air filter on cars with interior cooling | B126GC | |||
| May 59 to Jun. 59 | S-Type | B1HB to B45HB | No recordable modifications | |
| May 59 to Jun. 59 | B2HA to B50HA |
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