| Description | Date | Identifier | |
| Standardising lubrication holes in the crankpins to prevent big end bearing seizure. | 28th Jun 1937 | Box 115 \ 3 scan0037 | |
| Production implementation note for the 176th 'L' Series chassis, stating no extra tool cost. | 23th Aug 1937 | Box 115 \ 3 scan0038 | |
| Metalling of 24.Ph.III connecting rod bearing halves and the associated invoice. | 23th Aug 1937 | Box 115 \ 3 scan0039 | |
| Design change to incorporate Hall's metal bushes and fit new bottom tappets to the Ph.III.No.14 Unit. | 25th Aug 1937 | Box 115 \ 3 scan0040 | |
| Complaints of 'Main bearing sinkage' on Bentley engines and a material change to resolve the issue. | 27th Aug 1937 | Box 115 \ 3 scan0041 | |
| Updated arrangement for Phantom III connecting rod bearings using Halls metal. | 31th Aug 1937 | Box 115 \ 3 scan0042 | |
| History of modifications to bearings and their lubrication on Bentley cars. | 31th Mar 1937 | Box 115 \ 3 scan0043 | |
| Change in main bearing material from AC.7 to AC.2. | 31th Mar 1937 | Box 115 \ 3 scan0044 | |
| Works order memo for the rough machining of Hall's Metal Bearings and liners. | 2nd Sep 1937 | Box 115 \ 3 scan0045 | |
| Letter to The Hoyt Metal Co. reporting poor results from a comparative endurance test of 'Satco' bearing material. | 3rd Sep 1937 | Box 115 \ 3 scan0046 | |
| Letter to The Hoyt Metal Co. concerning the failure of 'Satco' lined bearings and arranging a visit for discussion. | 7th Sep 1937 | Box 115 \ 3 scan0047 | |
| Standardisation of the big end bearing bush and connecting rod to reduce oil consumption. | 5th Jul 1937 | Box 115 \ 3 scan0048 | |
| Estimated cost for new tools required for the production of the first 'M' Series chassis. | 13th Sep 1937 | Box 115 \ 3 scan0049 | |
| Letter to E.R.A. Ltd. regarding the supply and fitting instructions for bearing materials. | 13th Sep 1937 | Box 115 \ 3 scan0050 | |
| Letter from English Racing Automobiles Ltd. regarding engine testing and big end bearings. | 15th Sep 1937 | Box 115 \ 3 scan0051 | |
| Letter from High Duty Alloys Ltd. to W.A. Robotham regarding a meeting schedule. | 20th Sep 1937 | Box 115 \ 3 scan0052 | |
| Correction to the Chart of Bentley Bearings. | 22th Sep 1937 | Box 115 \ 3 scan0053 | |
| The inefficient production of Bentley Bearings in AC.2 and a proposal to switch to die casting. | 23th Sep 1937 | Box 115 \ 3 scan0054 | |
| Composition and production methods for aluminium alloy bearings. | 23th Sep 1937 | Box 115 \ 3 scan0055 | |
| Oil leaks from main bearings into the clutch pit on the Wraith model. | 28th Sep 1937 | Box 115 \ 3 scan0056 | |
| The investigation into an oil leak from the main bearing on the Wraith engine. | 6th Oct 1937 | Box 115 \ 3 scan0057 | |
| Investigation into oil leaks related to a felt packing seal and crankcase pressure. | 6th Oct 1937 | Box 115 \ 3 scan0058 | |
| Investigation into methods for reducing leaks by adding grooves to the main bearing and comparing designs. | 6th Oct 1937 | Box 115 \ 3 scan0059 | |
| Conclusion on tests to cure an oil leak, detailing modifications, further experiments and the deletion of felts. | 6th Oct 1937 | Box 115 \ 3 scan0060 | |
| Cut-away section of a crank showing a method to prevent oil leaking into the clutch pit for a Vauxhall '25' engine. | 2nd Oct 1937 | Box 115 \ 3 scan0061 | |
| Modification to the Wraith oil retaining scheme and crankshaft EW 91Z. | 7th Oct 1937 | Box 115 \ 3 scan0062 | |
| Blueprint of a rear bearing bush and bearing cap for the Wraith model. | 2nd Oct 1937 | Box 115 \ 3 scan0063 | |
| Blueprint for an end cover and a Wraith oil retainer. | 2nd Oct 1937 | Box 115 \ 3 scan0064 | |
| Review of excessive scrap in bearing production, detailing issues with various Hall's Aluminium-Tin alloys. | 30th Sep 1937 | Box 115 \ 3 scan0065 | |
| Properties and trials of A.C.6 alloy for die-cast main bearings, comparing it to other alloys. | 30th Sep 1937 | Box 115 \ 3 scan0066 | |
| Summarising conclusions on the production and trial of die-cast main bearings. | 30th Sep 1937 | Box 115 \ 3 scan0067 | |
| Benefits of producing aluminium alloy bearing shells using the centrifugal casting process. | 2nd Oct 1937 | Box 115 \ 3 scan0068 | |
| Solutions for an oil leak from the rear main bearing into the clutch pit on the Wraith III model. | 5th Oct 1937 | Box 115 \ 3 scan0069 | |
| Request for information on Aluminium Tin Bearing Alloy. | 6th Oct 1937 | Box 115 \ 3 scan0070 | |
| Putting in hand 12 sets of Hall's Metal big-end bearings for Phantom III experimental cars. | 6th Oct 1937 | Box 115 \ 3 scan0071 | |
| Requesting a further 12 Hall's Metal Phantom III big-end bearings after successful endurance tests to resolve failures. | 7th Oct 1937 | Box 115 \ 3 scan0072 | |
| Investigation report into engine thump and bearing failure on a Bentley chassis during Central Garage trails. | 11th Oct 1937 | Box 115 \ 3 scan0073 | |
| The endurance testing of Phantom III bearings using Hall's metal bushes, detailing a failure due to poor adhesion. | 13th Oct 1937 | Box 115 \ 3 scan0074 | |
| Letter to The Hoyt Metal Co. regarding an opinion on various failed engine bearings. | 13th Oct 1937 | Box 115 \ 3 scan0075 | |
| Request to produce two experimental sets of connecting rods and bearings for the Wraith III model. | 23th Oct 1937 | Box 115 \ 3 scan0076 | |
| Sub-committee report on the discussion of Bentley bearings for 3.5-litre engines. | 23th Oct 1937 | Box 115 \ 3 scan0077 | |
| Modifications and procedures for the 4¼ Litre engine, covering oil pump and bearing changes. | 28th Oct 1937 | Box 115 \ 3 scan0078 | |
| Clearances and fitting for Bentley main and connecting rod bearings. | 29th Oct 1937 | Box 115 \ 3 scan0079 | |
| Specification for the working clearance between the crankpins and bearings. | 29th Oct 1937 | Box 115 \ 3 scan0080 | |
| Modifications to bearings for Bentley, Wraith and 30.HP models. | 2nd Nov 1937 | Box 115 \ 3 scan0081 | |
| Instructions for reconditioning car 36-EX (No.11 Unit) with specific parts and testing before sale. | 2nd Nov 1937 | Box 115 \ 3 scan0082 | |
| Letter to The Hoyt Metal Co. regarding issues with 'Satco' bearings and the potential use of 'Eleven H' material for Ph.III big end bearing shells. | 2nd Nov 1937 | Box 115 \ 3 scan0083 | |
| Change of material for Wraith III connecting rod bearings. | 1st Nov 1937 | Box 115 \ 3 scan0084 | |
| Requirements for experimental Hall's bushed big end bearings, including specifications for different metalling materials. | 3rd Nov 1937 | Box 115 \ 3 scan0085 | |
| Cost savings and reliability of using centrifugal cast aluminium tin bearings. | 3rd Nov 1937 | Box 115 \ 3 scan0086 | |
| Proposal to use thinner shells for connecting rod bearings and the required experimental production. | 4th Nov 1937 | Box 115 \ 3 scan0087 | |
| Specifying the rear bearing thrust clearance for Bentley Bearings. | 8th Nov 1937 | Box 115 \ 3 scan0088 | |
| Investigation memo regarding the identification of AC6 Centricast bearings and a potential mix-up. | 13th Nov 1937 | Box 115 \ 3 scan0089 | |
| Investigation report into the failure of Bentley crankshaft main bearings during testing. | 15th Nov 1937 | Box 115 \ 3 scan0090 | |
| Issues with bearing hardness, heat treatment, and rejection rates for Bentley Crankcase Bearings. | 5th Nov 1937 | Box 115 \ 3 scan0091 | |
| The increased clearance specifications for cranks and bearings. | 17th Sep 1937 | Box 115 \ 3 scan0092 | |
| The softness of bearings after heat treatment and arrangements for material return. | 17th Sep 1937 | Box 115 \ 3 scan0093 | |
| Revised heat-treatment process for aluminium tin bearing alloys. | 6th Oct 1937 | Box 115 \ 3 scan0094 | |
| Alteration notice for a crankcase top half and various bearing bushes. | 5th Nov 1937 | Box 115 \ 3 scan0095 | |
| Main bearings, discussing issues with forged aluminium liners and recommending a new design without liners. | 15th Nov 1937 | Box 115 \ 3 scan0096 | |
| Advantages and proposed procedures for using Aluminium Alloy bearings over steel-backed bearings with white metal liners. | 16th Nov 1937 | Box 115 \ 3 scan0097 | |
| Casting temperature and heat treatment process for Bentley main bearings. | 16th Nov 1937 | Box 115 \ 3 scan0098 | |
| Specifications and procedures for Bentley Main Bearings material. | 16th Nov 1937 | Box 115 \ 3 scan0099 | |
| Instructions and decisions regarding test pieces, melting processes, casting weights, and material clearances. | 16th Nov 1937 | Box 115 \ 3 scan0100 | |
| Material choices for Bentley main bearings, specifically A.C.7 versus White Metal. | 16th Nov 1937 | Box 115 \ 3 scan0101 | |
| Production issues with Bentley main bearings and recommending a change in bearing material. | 16th Nov 1937 | Box 115 \ 3 scan0102 | |
| Photograph showing the condition of G.B.IV. main bearings after 15,545 miles of use in France. | 10th Nov 1937 | Box 115 \ 3 scan0103 | |
| History of bearings from 10,000-mile tests on Bentley and Phantom III models. | 10th Nov 1937 | Box 115 \ 3 scan0104 | |
| Bearing performance and failures in Bentley 3 1/2 and 4 1/4 Litre engines. | 16th Nov 1937 | Box 115 \ 3 scan0105 | |
| Engine bearing performance and failures for Bentley 4 1/4 Litre and Phantom III models. | 10th Nov 1937 | Box 115 \ 3 scan0106 | |
| Component failures and mileage for Phantom III experimental models. | 16th Nov 1937 | Box 115 \ 3 scan0107 | |
| Telephone call about bearing failures and recommended solutions for a customer in Paris. | 17th Nov 1937 | Box 115 \ 3 scan0108 | |
| Agreements and comments on the manufacturing process for Bentley Main Bearings AC7. | 17th Nov 1937 | Box 115 \ 3 scan0109 | |
| Material specifications, casting, and heat treatment processes for metal components. | 16th Nov 1937 | Box 115 \ 3 scan0110 | |
| The forwarding of Centricast AC6 bearings for heat treatment, Brinell testing, and long-distance testing. | 17th Nov 1937 | Box 115 \ 3 scan0111 | |
| Failure of increased main bearing clearances on a 4¼ Litre Bentley and reverting to the AC.7 specification. | 18th Nov 1937 | Box 115 \ 3 scan0112 | |
| Specifications for a trial production of Wraith & Bentley connecting rod bearings. | 18th Nov 1937 | Box 115 \ 3 scan0113 | |
| Requesting a decision on bearing clearances for the 4¼ Litre Bentley main bearings. | 19th Nov 1937 | Box 115 \ 3 scan0114 | |
| Specifying the clearances and fits for 4¼ Litre Bentley main bearings. | 19th Nov 1937 | Box 115 \ 3 scan0115 | |
| Specifications for crankshaft journal working clearance, Brinell hardness, and shims. | 19th Nov 1937 | Box 115 \ 3 scan0116 | |
| Directive to stop fitting A.C.2 main bearings due to production trouble. | 19th Nov 1937 | Box 115 \ 3 scan0117 | |
| Telegram received by telephone concerning AC 2 bearings for the attention of Robotham. | 20th Nov 1937 | Box 115 \ 3 scan0118 | |
| Telegram received by telephone regarding the clearance of AC2 Bearings. | 20th Nov 1937 | Box 115 \ 3 scan0119 | |
| Post Office telegram regarding the stock of AC 2 bearings. | 20th Nov 1937 | Box 115 \ 3 scan0120 | |
| The analysis and testing of Centricast AC6 and AC7 bearings. | 22th Nov 1937 | Box 115 \ 3 scan0121 | |
| Test results and re-classification of Centricast Test Bearings. | 22th Jan 1937 | Box 115 \ 3 scan0122 | |
| Instructions for fitting and testing Hall's Metal Bearings on Phantom III engines. | 22th Nov 1937 | Box 115 \ 3 scan0123 | |
| Letter to G.A. Vandervell confirming an outstanding order for complete discs and requesting prompt delivery. | 23th Nov 1937 | Box 115 \ 3 scan0124 | |
| Decision to use a combination of white metal rear main bearings and A.C.7 bearings. | 23th Nov 1937 | Box 115 \ 3 scan0125 | |
| Telegram regarding trouble with A.C.2 Main Bearings. | 24th Nov 1937 | Box 115 \ 3 scan0126 | |
| Confirming the start of production for AC7 gravity cast billets, batch number one. | 24th Nov 1937 | Box 115 \ 3 scan0127 | |
| The unit test running and examination of Bentley engine bearings. | 24th Nov 1937 | Box 115 \ 3 scan0128 | |
| Engine dismantling, bearing checks, and chassis delivery progress following a bearing issue. | 24th Nov 1937 | Box 115 \ 3 scan0129 | |
| The test and examination of AC7 Centricast Bearings, detailing issues and suggesting a new engine build. | 25th Nov 1937 | Box 115 \ 3 scan0130 | |
| Request for a report on new bearings before proceeding with a modified die casting process. | 27th Nov 1937 | Box 115 \ 3 scan0131 | |
| Issues and further testing requirements for Centricast A.C.6 and other bearing materials. | 27th Nov 1937 | Box 115 \ 3 scan0132 | |
| Proposal to formalize the testing of new Aluminium-Tin bearing alloys on a rig. | 27th Nov 1937 | Box 115 \ 3 scan0133 | |
| Laboratory memo discussing the stability and suitability of different materials and casting methods for bearings. | 2nd Dec 1937 | Box 115 \ 3 scan0134 | |
| Standardization of main bearings and the removal of shims for the Wraith model. | 2nd Dec 1937 | Box 115 \ 3 scan0135 | |
| Pros and cons of deleting liners between main bearing halves. | 29th Nov 1937 | Box 115 \ 3 scan0136 | |
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