| Description | Date | Identifier | |
| The dispatch of two 11' clutch plates for a 25/30 HP vehicle. | 1st Nov 1937 | Box 103 \ 1 scan0246 | |
| Instruction to fit a Thermoid faced driven plate to a car's clutch and test the springs. | 5th Nov 1937 | Box 103 \ 1 scan0247 | |
| Clutch spring issues on the 4¼ Litre Bentley & 25/30 models, proposing a test rig to check spring poundage. | 8th Nov 1937 | Box 103 \ 1 scan0248 | |
| Requesting an order for more 20/25 and 3 ½ litre clutch springs due to depleted stock. | 19th Nov 1937 | Box 103 \ 1 scan0249 | |
| Standardization of 11 inch Thermoid clutch driven plates for the 25/30 HP model. | 6th Dec 1937 | Box 103 \ 1 scan0250 | |
| Standardisation of Thermoid clutch facings for the 25/30 HP model, replacing Rabestos facings. | 6th Dec 1937 | Box 103 \ 1 scan0251 | |
| Proposing to alter existing stock of clutch plates from Rabestos to Thermoid facings for the 25/30 HP model. | 6th Dec 1937 | Box 103 \ 1 scan0252 | |
| The standardisation and conversion of 25/30 clutch driven plates to Thermoid. | 8th Dec 1937 | Box 103 \ 1 scan0253 | |
| Confirming the decision to replace 25/30 HP clutch plates from Rabestos to Thermoid. | 7th Dec 1937 | Box 103 \ 1 scan0254 | |
| Instructions for a '1000 slip' test on a 20/25 & 3 1/2 litre clutch. | 8th Dec 1937 | Box 103 \ 1 scan0255 | |
| Agreement to return unused 25/30 HP chassis clutch plates to Borg & Beck for facing replacement with Thermoid. | 6th Dec 1927 | Box 103 \ 1 scan0256 | |
| Stock and use of bronze type friction facing for 25/30 HP clutches. | 22th Dec 1937 | Box 103 \ 1 scan0257 | |
| New part number for Graphite Bronze clutch facings for the 20/25 HP & 3½-Litre models. | 22th Jan 1938 | Box 103 \ 1 scan0258 | |
| Extent of wear or slack found in a clutch bush for the 20/25 HP and Bentley models. | 25th Feb 1938 | Box 103 \ 1 scan0259 | |
| Supply, demand, and future ordering of Graphite Bronze Clutch Facings for the 20/25 HP model. | 12th Aug 1938 | Box 103 \ 1 scan0260 | |
| Recommending to increase an order for 1,000 facings from Vandervells due to a lack of local production. | 12th Aug 1938 | Box 103 \ 1 scan0261 | |
| Questioning the drilling angle of oil drain holes in 25/30 & Bentley flywheels to assess potential savings. | 29th Aug 1938 | Box 103 \ 1 scan0262 | |
| Requesting the fabrication of clutch segments and a packing ring from sintered graphite bronze for a 20/25 HP model. | 2nd Sep 1938 | Box 103 \ 1 scan0263 | |
| Testing new 'Sintered Bronze' clutch facings on a car. | 14th Oct 1938 | Box 103 \ 1 scan0264 | |
| Test report on the performance of a Graphite Bronze clutch after 10.5 months of use. | 15th Aug 1938 | Box 103 \ 1 scan0265 | |
| Test report comparing the performance of Graphite Bronze, Sintered Bronze, and Ferodo clutch facings. | 1st Dec 1938 | Box 103 \ 1 scan0266 | |
| Table showing cylinder wear particulars for July 1939, measured in thousandths of an inch. | 2nd Aug 1939 | Box 103 \ 2 scan0001 | |
| Ledger sheet detailing measurements for various vehicle chassis. | 1st Jul 1939 | Box 103 \ 2 scan0002 | |
| Measurement log sheet for various chassis, including remarks. | 31th Jul 1939 | Box 103 \ 2 scan0003 | |
| List of Bentley chassis fitted with replacement cylinder blocks during July 1939. | 4th Aug 1939 | Box 103 \ 2 scan0004 | |
| Directive regarding the specifications for replacement piston rings on Bentley and Phantom III models. | 7th Jul 1939 | Box 103 \ 2 scan0005 | |
| Specification sheet for piston ring part numbers for 3½ & 4¼ Litre Bentley and Phantom III models. | 11th Jul 1939 | Box 103 \ 2 scan0006 | |
| Oil consumption for chassis B.200.LS following an engine clean and fitting of new piston rings. | 11th Jul 1939 | Box 103 \ 2 scan0007 | |
| List of Bentley chassis fitted with replacement cylinder blocks during June 1939. | 10th Jul 1939 | Box 103 \ 2 scan0008 | |
| Cylinder wear measurements for various chassis during June 1939. | 10th Jul 1939 | Box 103 \ 2 scan0009 | |
| Tabular log of component measurements for various chassis, with corresponding remarks. | 1st Jun 1939 | Box 103 \ 2 scan0010 | |
| Log sheet recording chassis inspection measurements and remarks from June 1939. | 1st Jun 1939 | Box 103 \ 2 scan0011 | |
| Cylinder wear measurements for various chassis during May 1939. | 5th Jun 1939 | Box 103 \ 2 scan0012 | |
| Log sheet of engine cylinder bore measurements for various chassis. | 31th May 1939 | Box 103 \ 2 scan0013 | |
| List of Bentley chassis fitted with replacement cylinder blocks during May 1939. | 7th Jun 1939 | Box 103 \ 2 scan0014 | |
| Wear measurements in engine bores and pistons for a specific chassis. | 3rd May 1939 | Box 103 \ 2 scan0015 | |
| The wear measurements in the bores and pistons for a Ford V8 chassis. | 3rd May 1939 | Box 103 \ 2 scan0016 | |
| Wear measurements for the bores and pistons of a Chevrolet vehicle. | 13th Apr 1939 | Box 103 \ 2 scan0017 | |
| The wear measurements of engine bores and pistons for a Chevrolet (GA) chassis. | 3rd Apr 1939 | Box 103 \ 2 scan0018 | |
| Wear in engine bores and pistons for a Chevrolet vehicle. | 1st Apr 1939 | Box 103 \ 2 scan0019 | |
| Wear measurements for engine bores and pistons on a Pontiac chassis. | 30th Mar 1939 | Box 103 \ 2 scan0020 | |
| Wear in bores and pistons for a Chevrolet 30 chassis. | 30th Mar 1939 | Box 103 \ 2 scan0021 | |
| List of Bentley chassis fitted with replacement cylinder blocks during April 1939. | 5th May 1939 | Box 103 \ 2 scan0022 | |
| Table detailing cylinder wear measurements (nominal and oval) for various chassis during April 1939. | 4th May 1939 | Box 103 \ 2 scan0023 | |
| Log sheet from April 1939 detailing numerical measurements for various car chassis. | 28th Apr 1939 | Box 103 \ 2 scan0024 | |
| List of Bentley chassis fitted with replacement cylinder blocks during March 1939. | 5th Apr 1939 | Box 103 \ 2 scan0025 | |
| Cylinder wear measurements for various chassis during March 1939. | 4th Apr 1939 | Box 103 \ 2 scan0026 | |
| Tabular log of chassis measurements and remarks from March 1939. | 31th Mar 1939 | Box 103 \ 2 scan0027 | |
| The history and specifications of chilled cylinder bores for Bentley production. | 14th Feb 1939 | Box 103 \ 2 scan0028 | |
| Cylinder iron specifications, identifying the last chassis produced with chilled bores. | 27th May 1938 | Box 103 \ 2 scan0029 | |
| Summary of work and average wear figures for cylinder bores on various engine models. | 11th Mar 1939 | Box 103 \ 2 scan0030 | |
| History and properties of chilled cylinder bores in Bentley engines and advocating for better record-keeping. | 11th Mar 1939 | Box 103 \ 2 scan0031 | |
| Experimental cylinder liner materials and their resistance to corrosive and frictional wear. | 11th Mar 1939 | Box 103 \ 2 scan0032 | |
| Engine bore wear, corrosion testing methods, and the use of centrifugally cast cylinder inserts. | 11th Mar 1939 | Box 103 \ 2 scan0033 | |
| Engine bore chrome plating experiments and a comparison of split skirt versus solid skirt pistons. | 11th Mar 1939 | Box 103 \ 2 scan0034 | |
| Continued report on pistons, comparing Aerolite and standard types, and discussing bore wear testing. | 11th Mar 1939 | Box 103 \ 2 scan0035 | |
| Test bed procedures and results for accelerating cylinder block bore wear. | 11th Mar 1939 | Box 103 \ 2 scan0036 | |
| Engine component wear test report detailing procedures and results for various tests. | 11th Mar 1939 | Box 103 \ 2 scan0037 | |
| Engine liner wear results from a series of three different tests. | 11th Mar 1939 | Box 103 \ 2 scan0038 | |
| Technical discussion on engine bore wear tests and the function of piston rings. | 11th Mar 1939 | Box 103 \ 2 scan0039 | |
| Piston ring types and a proposed experimental testing programme. | 11th Mar 1939 | Box 103 \ 2 scan0040 | |
| Cylinder wear measurements for various chassis during February 1939. | 6th Mar 1939 | Box 103 \ 2 scan0041 | |
| Data log sheet of measurements for various chassis, with entries dated throughout February and March 1939. | 1st Mar 1939 | Box 103 \ 2 scan0042 | |
| Summary of petrol pump complaints for 3.5 & 4.25 litre Bentley models, recorded during February 1939. | 6th Mar 1939 | Box 103 \ 2 scan0043 | |
| List of Bentley chassis fitted with replacement cylinder blocks during February 1939. | 6th Mar 1939 | Box 103 \ 2 scan0044 | |
| List of S.U. Petrol Pumps removed from Bentley chassis during February 1939, detailing complaints. | 6th Mar 1939 | Box 103 \ 2 scan0045 | |
| Vehicle owner, mileage, and cylinder block replacement. | 22th Feb 1935 | Box 103 \ 2 scan0046 | |
| The fitting of a special cylinder block and the wear measurements of the old one. | 24th Feb 1938 | Box 103 \ 2 scan0047 | |
| Sketch showing cross-sections for drilling holes in the intermediate journals of a Bentley crankshaft. | 24th Feb 1939 | Box 103 \ 2 scan0048 | |
| Cylinder wear measurements taken during January 1939, showing amounts plus nominal and oval in thousandths of an inch. | 3rd Feb 1939 | Box 103 \ 2 scan0049 | |
| Tabular log of chassis measurements and remarks from January 1939. | 31th Jan 1939 | Box 103 \ 2 scan0050 | |
| Cylinder bore wear on Bentley pistons. | 2nd Feb 1939 | Box 103 \ 2 scan0051 | |
| Cylinder block wear measurements for various chassis, listed in order of mileage. | 26th Jan 1939 | Box 103 \ 2 scan0052 | |
| The fitting of a special cylinder block and measurements of the old block. | 15th Feb 1939 | Box 103 \ 2 scan0053 | |
| Special features and modifications fitted to owner's cars. | 24th Jan 1939 | Box 103 \ 2 scan0054 | |
| Dispatch of four special Nickel-chrome-molybdenum cylinder blocks for wear testing. | 23th Jan 1939 | Box 103 \ 2 scan0055 | |
| List of Bentley chassis fitted with replacement cylinder blocks during December 1938. | 4th Jan 1939 | Box 103 \ 2 scan0056 | |
| Table of cylinder wear particulars for December 1938, showing nominal and oval amounts in thousandths of an inch. | 4th Jan 1939 | Box 103 \ 2 scan0057 | |
| Log sheet detailing measurements and remarks for various chassis, identified by number and manufacturing details. | 31th Dec 1938 | Box 103 \ 2 scan0058 | |
| Tabular record of chassis component measurements and remarks. | 31th Dec 1938 | Box 103 \ 2 scan0059 | |
| Requesting clarification on whether recent engine re-bores on two vehicles were the first. | 8th Dec 1938 | Box 103 \ 2 scan0060 | |
| Table detailing cylinder wear measurements taken during November 1938, showing amounts plus nominal and oval in thousandths of an inch. | 1st Dec 1938 | Box 103 \ 2 scan0061 | |
| Tabulated log sheet of engine cylinder measurements and remarks for various chassis. | 1st Nov 1938 | Box 103 \ 2 scan0062 | |
| List of Bentley chassis fitted with replacement cylinder blocks during November 1938. | 5th Dec 1938 | Box 103 \ 2 scan0063 | |
| Trial of Brico hard cylinder inserts for Bentley and Wraith engines to eliminate wear. | 13th Oct 1938 | Box 103 \ 2 scan0064 | |
| Brico cylinder inserts, their benefits, and material specifications. | 11th Oct 1938 | Box 103 \ 2 scan0065 | |
| Cylinder liner tests and observations on piston and bore wear, including a proposal from the British Piston Ring Co. | 11th Oct 1938 | Box 103 \ 2 scan0066 | |
| Bentley cylinder block with premature excessive bore wear after 12,000 miles. | 5th Aug 1938 | Box 103 \ 2 scan0067 | |
| List of Bentley chassis fitted with replacement cylinder blocks during October 1938. | 2nd Nov 1938 | Box 103 \ 2 scan0068 | |
| Table detailing cylinder wear measurements for various chassis during October 1938. | 2nd Nov 1938 | Box 103 \ 2 scan0069 | |
| Log sheet of measurements for specific vehicle chassis, with remarks and details on bore diameters and oil supply. | 1st Oct 1938 | Box 103 \ 2 scan0070 | |
| Cylinder bore wear figures for 3 1/2 and 4 1/4 litre Bentley cars. | 25th Oct 1938 | Box 103 \ 2 scan0071 | |
| List of Bentley chassis fitted with replacement cylinder blocks during September 1939. | 6th Oct 1939 | Box 103 \ 2 scan0072 | |
| Table of cylinder wear measurements for various chassis during September 1938. | 30th Sep 1938 | Box 103 \ 2 scan0073 | |
| Log sheet from September 1938 recording various measurements against chassis numbers. | 30th Sep 1938 | Box 103 \ 2 scan0074 | |
| Letter requesting a comparison of cylinder bore wear figures between 4¼ and 3½ litre Bentley engines. | 10th Oct 1938 | Box 103 \ 2 scan0075 | |
| Internal memorandum concerning cylinder bore wear, the use of Arctic Oil, and handling a specific customer complaint. | 3rd Oct 1938 | Box 103 \ 2 scan0076 | |
| Log sheet detailing service records for various Bentley chassis, including oil type, mileage, and owner information. | 20th Sep 1938 | Box 103 \ 2 scan0077 | |
| Cylinder wear on chassis B.103.GP, noting a recent rebore and suggesting a trial of 'Arctic' oil. | 22th Sep 1938 | Box 103 \ 2 scan0078 | |
| Cover note for an enclosed chart regarding Bentley cylinder bore wear. | 20th Sep 1938 | Box 103 \ 2 scan0079 | |
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