| Description | Date | Identifier | |
| Comparative report on bearing wear with oil flow test times for four Bentley chassis. | 26th Aug 1938 | Box 114 \ 3 scan0066 | |
| Log of vehicle test results and owner complaints regarding engine knocks and thumps. | 26th Aug 1938 | Box 114 \ 3 scan0067 | |
| Test report ledger page detailing mileage, issues, and measurements for four different vehicles. | 26th Aug 1938 | Box 114 \ 3 scan0068 | |
| Log of vehicle test results and complaints for four separate jobs. | 26th Aug 1938 | Box 114 \ 3 scan0069 | |
| Log sheet detailing vehicle complaints, test results, and modifications for four separate jobs. | 26th Aug 1938 | Box 114 \ 3 scan0070 | |
| Log of vehicle test results and measurements for four different cars. | 23th Sep 1938 | Box 114 \ 3 scan0071 | |
| Boring tool made by Kingsbury for crank journal bearings and its benefits. | 23th Sep 1938 | Box 114 \ 3 scan0072 | |
| Outlining proposals for fitting different types of engine bearings to the 3.5 Litre engine. | 22th Sep 1938 | Box 114 \ 3 scan0073 | |
| Recurring bearing failures on a 3½ Litre Bentley and the debate over repair methods. | 20th Sep 1938 | Box 114 \ 3 scan0074 | |
| Engine modifications, bearing types, and associated costs for an R.20 service. | 20th Sep 1938 | Box 114 \ 3 scan0075 | |
| Forwarding a broken intermediate journal bearing from a Bentley, chassis B.149.KU. | 10th Jun 1938 | Box 114 \ 3 scan0076 | |
| Trial to use thin oils on Bentley cars to reduce cylinder bore wear after a re-bore. | 6th May 1938 | Box 114 \ 3 scan0077 | |
| Query about the method and tooling for crushing shells into connecting rods. | 3rd May 1938 | Box 114 \ 3 scan0078 | |
| Cover note to Bentley Motors Ltd. regarding chassis B.125.GP and attaching related documents. | 7th Jun 1938 | Box 114 \ 3 scan0079 | |
| Letter to Bentley Motors Ltd. regarding seized bearings and crankshaft measurements for chassis B.125.GP. | 7th Jun 1938 | Box 114 \ 3 scan0080 | |
| Seized main bearings, considering crankshaft bow, crank ovality, and bearing material as potential causes. | 3rd Jun 1938 | Box 114 \ 3 scan0081 | |
| To Bentley Motors Ltd. regarding chassis F.125.GP and an attached document. | 31th May 1938 | Box 114 \ 3 scan0082 | |
| Investigation into an engine thud and knock on chassis B.125.GP. | 30th May 1938 | Box 114 \ 3 scan0083 | |
| Crankshaft and main bearing measurements, partial seizure damage, and subsequent engine repairs. | 30th May 1938 | Box 114 \ 3 scan0084 | |
| Bentley Oil Flow Test, detailing established times for bearing conditions and specific test results. | 1st Jun 1938 | Box 114 \ 3 scan0085 | |
| The treatment for bearing troubles on the 4¼ Litre Bentley Chassis. | 1st Jun 1938 | Box 114 \ 3 scan0086 | |
| Recommendations for dealing with Bentley engines at service depots, detailing modifications for oil consumption and engine roughness. | 1st Jun 1938 | Box 114 \ 3 scan0087 | |
| Page detailing engine modifications, bearing replacement procedures, labour hours, and oil flow testing. | 4th May 1938 | Box 114 \ 3 scan0088 | |
| Investigating the use of thin oils in Bentley engines and noting oil brand usage by owners. | 4th May 1938 | Box 114 \ 3 scan0089 | |
| Use of thin oils in Bentley engines and a survey of oils currently in use by customers. | 4th May 1938 | Box 114 \ 3 scan0090 | |
| Return of two bearings for examination due to a suspected issue with the chamfering process. | 26th Apr 1938 | Box 114 \ 3 scan0091 | |
| Extract from 'AUTOCAR' detailing the introduction of new Castrol oil grades by C.C. Wakefield & Co. | 1st Apr 1938 | Box 114 \ 3 scan0092 | |
| Engine wear on chassis B.144.HK and recommending the use of a low viscosity oil. | 22th Mar 1938 | Box 114 \ 3 scan0093 | |
| Correction for a chart regarding Bentley bearings. | 22th Sep 1937 | Box 114 \ 3 scan0094 | |
| Excessive cylinder wear on a vehicle, the policy on reboring, and who should bear the cost. | 17th Mar 1938 | Box 114 \ 3 scan0095 | |
| Cracked air silencer on chassis B.230.GA, requesting examination and repair. | 17th Mar 1938 | Box 114 \ 3 scan0096 | |
| 3.5 litre Bentley with white metal found in the oil after bearing replacement. | 26th Oct 1936 | Box 114 \ 3 scan0097 | |
| Meeting notes discussing crankshaft bearing failures on 4¼ litre Bentley engines and proposed modifications. | 10th Dec 1936 | Box 114 \ 3 scan0098 | |
| List of proposed improvements and actions intended for the 4 1/4 litre Bentley production. | 10th Dec 1936 | Box 114 \ 3 scan0099 | |
| Requirement for new crankshaft main bearing cap forgings and a proposal to retain steel caps. | 18th Dec 1936 | Box 114 \ 3 scan0100 | |
| High pressure oil filter, riding control, oil pump, and valve rocker gear for a Bentley engine. | 18th Dec 1936 | Box 114 \ 3 scan0101 | |
| Investigation into an engine seizure on a 4 1/4 Litre Bentley, concluding the cause was outdated crank lubrication holes. | 3rd Mar 1938 | Box 114 \ 3 scan0102 | |
| List of modifications to the oiling system for specific vehicle series, particularly for owners known to be hard drivers. | 3rd Mar 1938 | Box 114 \ 3 scan0103 | |
| Requesting the return of bearings and a soft crankshaft from chassis B.165.KU to the Works. | 17th Feb 1938 | Box 114 \ 3 scan0104 | |
| Car (chassis B.165.KU) with a bad thump, diagnosed as having a soft crankshaft with worn and scored journals. | 17th Feb 1938 | Box 114 \ 3 scan0105 | |
| Engine that was run with insufficient oil, leading to trouble. | 3rd Feb 1938 | Box 114 \ 3 scan0106 | |
| Customer's low oil level, related charges, and investigation into a potential leak. | 3rd Feb 1938 | Box 114 \ 3 scan0107 | |
| Typed copy of a customer complaint letter to Bentleys Ltd. regarding an extravagant oil change and a suspected oil leak. | 1st Feb 1938 | Box 114 \ 3 scan0108 | |
| The engine failure of chassis B-128-GA, noting a seized connecting rod and previous repairs. | 27th Jan 1938 | Box 114 \ 3 scan0109 | |
| Mileage discrepancies and potential oil consumption issues for chassis B.128-GA. | 5th Feb 1938 | Box 114 \ 3 scan0110 | |
| Clarifying a misunderstanding regarding a car's mileage and low oil level before an engine breakdown. | 8th Feb 1938 | Box 114 \ 3 scan0111 | |
| Confirming facts and delegating the investigation of engine trouble for Chassis No. B.128.GA. | 10th Feb 1938 | Box 114 \ 3 scan0112 | |
| Agreeing to the stated position on a misunderstanding regarding mileage for Chassis B.128.GA. | 11th Feb 1938 | Box 114 \ 3 scan0113 | |
| Summarizing a customer dispute over an oil top-up charge and subsequent engine trouble due to a shortage of oil. | 9th Feb 1938 | Box 114 \ 3 scan0114 | |
| Cover note for memos regarding an engine failure on a 4 1/4-litre chassis, No.B.149.JY. | 22th Feb 1938 | Box 114 \ 3 scan0115 | |
| Engine failure of a 4¼-litre chassis B.149.JY and a subsequent examination request by High Duty Alloys. | 22th Feb 1938 | Box 114 \ 3 scan0116 | |
| Interference fit and nip allowance for Bentley main bearings. | 14th Jan 1938 | Box 114 \ 3 scan0117 | |
| The washing and treatment of cotton duck washers for crankshaft dampers. | 24th Jan 1938 | Box 114 \ 3 scan0118 | |
| To Bentley Motors Ltd. regarding the hardness of a re-nitrided crankshaft for chassis B.35.KU, the 1938 Paris Trials Car. | 27th Jan 1938 | Box 114 \ 3 scan0119 | |
| The treatment procedure for fabrics used in Bentley crankshaft dampers. | 1st Feb 1938 | Box 114 \ 3 scan0120 | |
| Amendments to fitting instructions for Bentley main bearings. | 3rd Jan 1938 | Box 114 \ 3 scan0121 | |
| Engine modifications and clutch issues on Bentley Chassis B-142-HK for H.R.H. The Duke of Kent. | 16th Oct 1937 | Box 114 \ 3 scan0122 | |
| Follow-up memo regarding modifications suggested for the Duke of Kent's car, B-142-HK. | 7th Sep 1937 | Box 114 \ 3 scan0123 | |
| Modifications for the Duke of Kent's Phantom III car, specifically regarding its oil consumption. | 3rd Sep 1937 | Box 114 \ 3 scan0124 | |
| The introduction of a larger oil pump to a Bentley Chassis to address low oil consumption. | 17th Aug 1937 | Box 114 \ 3 scan0125 | |
| Repairs to Bentley Chassis B-202-GA for a thump and poor oil consumption. | 21th Sep 1937 | Box 114 \ 3 scan0126 | |
| Modifications to be carried out on chassis No.P.142.HK for the Duke of Kent. | 7th Sep 1937 | Box 114 \ 3 scan0127 | |
| Instruction regarding the correct procedure for a drop in oil pressure on a Bentley chassis. | 7th Oct 1937 | Box 114 \ 3 scan0128 | |
| Main bearing, oil pressure, and connecting rod failures for a Bentley engine from chassis No.B.117.JY. | 30th Sep 1937 | Box 114 \ 3 scan0129 | |
| Analysis of a connecting rod failure in a 4¼-litre engine, discussing oil pressures and potential over-revving as causes. | 30th Sep 1937 | Box 114 \ 3 scan0130 | |
| Investigation into the tightening of big end bearings and the resulting effect on oil consumption and pressure. | 30th Sep 1937 | Box 114 \ 3 scan0131 | |
| Big end bearing shell preloading, nip, and crankcase journal bearings. | 30th Sep 1937 | Box 114 \ 3 scan0132 | |
| Investigating an engine's idling knock, diagnosed as main bearing sinkage. | 30th Sep 1937 | Box 114 \ 3 scan0133 | |
| Inspection photograph of engine main bearings and their upper halves, laid out after a mileage test. | 30th Sep 1937 | Box 114 \ 3 scan0134 | |
| Log of crankshaft and main bearing measurements for chassis B.117.J.Y. | 2nd Oct 1937 | Box 114 \ 3 scan0135 | |
| Final clearance measurements for main bearings of chassis B 117 J.Y. | 2nd Oct 1937 | Box 114 \ 3 scan0136 | |
| Oil pressure test results for Mr Lappin's car, registration B.117.JY. | 21th Sep 1937 | Box 114 \ 3 scan0137 | |
| Requesting a correction to a chart for Bentley bearings and crankshafts. | 21th Sep 1937 | Box 114 \ 3 scan0138 | |
| Internal memorandum regarding the treatment for bearing troubles on the 4 1/4-Litre Bentley Chassis. | 1st Jun 1938 | Box 114 \ 3 scan0139 | |
| Bearing from a Bentley B.166.LS chassis with low mileage, noting slack and comparing fitting methods after an accident. | 31th Oct 1938 | Box 114 \ 3 scan0140 | |
| Use of RR.56 shims in conjunction with white metal bearings for 3.5 litre Bentley engines. | 20th Dec 1937 | Box 114 \ 3 scan0141 | |
| Bentley crankshaft failure due to an issue with the nitriding furnace circulation. | 2nd Dec 1937 | Box 114 \ 3 scan0142 | |
| Engine problems and customer complaint regarding Bentley Chassis 41-GP. | 16th Dec 1937 | Box 114 \ 3 scan0143 | |
| Crankshaft measurements and wear for Chassis B-102-KT at 4,900 miles. | 22th Nov 1937 | Box 114 \ 3 scan0144 | |
| Crankshaft hardness, comparing with other manufacturers and investigating scoring issues. | 9th Sep 1937 | Box 114 \ 3 scan0145 | |
| Fitting shells to connecting rods on a Bentley Chassis. | 9th Sep 1937 | Box 114 \ 3 scan0146 | |
| Complaints about unsatisfactory re-conditioned connecting rods and centralizing future repairs. | 27th Aug 1937 | Box 114 \ 3 scan0147 | |
| Instruction on marking connecting rods with their weight for individual replacement across all chassis. | 19th Aug 1937 | Box 114 \ 3 scan0148 | |
| Internal memorandum discussing the failure of re-conditioned Bentley connecting rods and planned manufacturing improvements. | 16th Aug 1937 | Box 114 \ 3 scan0149 | |
| Manufacturing change to the undercuts on a Bentley connecting rod bearing bush. | 14th Aug 1937 | Box 114 \ 3 scan0150 | |
| Return of six unsatisfactory reconditioned connecting rods for chassis No.B.35.BL. | 6th Aug 1937 | Box 114 \ 3 scan0151 | |
| Investigation into the bedding procedure for Bentley connecting rods and their bearing shells. | 3rd Aug 1937 | Box 114 \ 3 scan0152 | |
| The practice of giving bearings a .002' nip to prevent them from coming loose. | 28th Jul 1937 | Box 114 \ 3 scan0153 | |
| The engine bearing conditions of the Paris Trials Car B.S.G.A. after significant mileage. | 6th Jul 1937 | Box 114 \ 3 scan0154 | |
| Issues with Bentley connecting rod liners and the despatch of rear axles. | 9th Jun 1937 | Box 114 \ 3 scan0155 | |
| Responding to a complaint about Bentley connecting rods and the corrective actions taken. | 22th Jun 1937 | Box 114 \ 3 scan0156 | |
| Calculating the average profit on Bentleys sold in France after the guarantee period, considering free of charge work. | 11th Jan 1937 | Box 114 \ 3 scan0157 | |
| Troubleshooting scoring shafts and Hall's Aluminium bearings, suggesting testing methods including monitoring oil temperature. | 2nd Nov 1936 | Box 114 \ 3 scan0158 | |
| Technical note on the issues and satisfactory methods for regrinding crankshafts. | 2nd Nov 1936 | Box 114 \ 3 scan0159 | |
| Increased oil consumption on a Bentley chassis after the introduction of a larger oil pump. | 13th Aug 1937 | Box 114 \ 3 scan0160 | |
| Analysis of the failure of the No.1 Big End bearing for chassis B.238-CA. | 22th Dec 1937 | Box 114 \ 3 scan0161 | |
| Letter concerning the hardness testing of a re-nitrided Bentley crankshaft. | 22th Dec 1937 | Box 114 \ 3 scan0162 | |
| Specification sheet detailing the material composition and treatment for a Bentley V.C.M. crankshaft. | 19th Nov 1937 | Box 114 \ 3 scan0163 | |
| Methodology and results of Kingsbury oil flow tests on two engines. | 19th Nov 1937 | Box 114 \ 3 scan0164 | |
| Schematic of a motor-driven system connected to a pressurized fluid feed apparatus with a one-gallon capacity. | 19th Nov 1907 | Box 114 \ 3 scan0165 | |
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