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R-Type Chassis

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R-TYPE

 

The chassis number for these models is composed of an initial fixed letter 'B', followed by a number that can go from 1 to 600. Finally two letters of which the first one determines the series of the model.

 

Usually the chassis number for these mdels can be found on the firewall.

Release dates Chassis number Modification Modification introduced at
 Jun. 52 to Apr. 53

 B2RT to B120RT

  Revised luggage boot, automatic SU carburetters, revised attitude rear springs, revised rear shock damper linkage, two speed windscreen wiper, pop-out cigar lighter, separately housed main fuse, caster angle wedges  B2RT 
 Sep. 52 to Apr. 53  B1RS to B121RS  Corrugated bottom water hose connection  B68RT 
 Sep. 52 to May 53  B2SR to B500SR  Taper roller bearings on rear axle pinion (except 12/41 axle)  B380SR 
 Jan. 53 to May 53  B1SP to B501SP  Front shock dampers  B61SP 
     Parco lubrized tappets B425SP 
     Taper roller bearings on rear axle pinion 12/41 axle B433SP 
 Apr. 53 to Sep. 53  B1TO to B401TO  6.75 compression ratio cylinder head  B93TO 
 Jun. 53 to Dec. 53  B2TN to B600TN   Deletion of non-opposed springs in side steering tube  B313TO 
     All welded frames B349TO 
     Metal facia, cable operated hot and cold, de-mister and underseat heater B2TN 
     Hard clay gasket B373TN 
     Deletion of reduced friction modification on steering connections B390TN 
     Revised throttle controls for synchromesh gearbox B436TN 
 Oct. 53 to Dec. 53  B1UL to B251UL  Aluminium flywheel housing  B35UL 
 Nov. 53 to May 54  B2UM to B250UM   Improved type underseat seat tool tray  B66UM 
     Introduction of B-VI type gearbox tie rod B212UM 
 Jan. 54 to May 54  B2WH to B300WH  Flywheel inertia ring on cars with auto gearbox B236WH 
 Mar. 54 to Jun. 54  B1WG to B301WG  Dynamo type mounting strap onstarter motor B270WH 
     Thicker 3rd motion shaft thrust washer B89WG 
     Compensator pipe between front and rear servo B183WG 
 May 54 to Jul. 54  B2XF to B140XF  Strengthened jaws on front brake operating links B60XF 
 Jun. 54 to Oct. 54  B1YA to B331YA  12/41 rear axle (all cars) B1YA 
 Aug. 54 to Nov. 54  B2YD to B330YD  Elimination of chromium-plated servo pressure plate B123YD 
     Long stroke starter pinion B138YD 
     Flexibox seal on water pump  B246YD 
     Bentley continental type de-misting B246YD 
 Oct. 54 to Jan. 55  B1ZX to B251ZX  Improved cold starting device B1ZX 
 Dec. 54 to Feb. 55  B2ZY to B250ZY  2nd speed start B73ZX 
     Ferodo washers and drain slots in crankshaft vibration damper B212ZY