| Description | Date | Identifier | |
| Findings of a connecting rod failure on a Bentley B.14-HK 4 1/4-Litre engine. | 24th Jun 1937 | Box 131 \ 4 scan0323 | |
| Complaint about erratic charging from a Bentley Dynamo on chassis 122 JD, caused by oil on the commutator. | 24th Jun 1937 | Box 131 \ 4 scan0324 | |
| 4 1/4 Litre Bentley connecting rod failure at 10,340 miles. | 25th Jun 1937 | Box 131 \ 4 scan0325 | |
| The satisfactory performance of a Phantom III gearbox synchromesh. | 25th Jun 1937 | Box 131 \ 4 scan0326 | |
| Modification of heavy exhaust valves on the Phantom II to overcome difficulty in quietening them. | 25th Jun 1937 | Box 131 \ 4 scan0327 | |
| Inquiry regarding a noisy Bentley rear axle on car 138.J.D., suspecting a missing propeller shaft damper. | 25th Jun 1937 | Box 131 \ 4 scan0328 | |
| Internal brake noise complaints on P.III, 25/30, and Bentley models and a proposed solution. | 26th Jun 1937 | Box 131 \ 4 scan0329 | |
| Noise issue with a Bentley rear axle, chassis 138-J.D. | 26th Jun 1937 | Box 131 \ 4 scan0330 | |
| Issues with stove enamelling on Bentley & 25/30HP cylinder blocks due to a change in jointing material. | 28th Jun 1937 | Box 131 \ 4 scan0331 | |
| Investigation into the cause of peeling enamel on cylinder heads of Bentley and 25/30.HP engines. | 25th Jun 1937 | Box 131 \ 4 scan0332 | |
| Poor oil consumption tests for Chassis 260 GA, belonging to Mr. Embiricos. | 29th Jun 1927 | Box 131 \ 4 scan0333 | |
| Intended modification to lighten the P.II. exhaust valves and questioning its effectiveness. | 29th Jun 1937 | Box 131 \ 4 scan0334 | |
| Complaint about the excessive width of slots on Bentley front anchorage brackets. | 29th Jun 1937 | Box 131 \ 4 scan0335 | |
| Noisy axle and faulty ball race bedding on a Bentley Chassis B-138-JD. | 29th Jun 1937 | Box 131 \ 4 scan0336 | |
| Issues with the throttle spring and carburettor flange joint washer for the Bentley 4¼ Litre model. | 30th Jun 1937 | Box 131 \ 4 scan0337 | |
| Use of high pressure grease for brake toggles to address noise issues. | 1st Jul 1937 | Box 131 \ 4 scan0338 | |
| Issues and proposed modifications for Phantom II exhaust valves. | 3rd Jul 1937 | Box 131 \ 4 scan0339 | |
| Proposal to lighten the Phantom II exhaust valves. | 5th Jul 1937 | Box 131 \ 4 scan0340 | |
| Specifications of the Bentley petrol gauge wire for different models. | 5th Jul 1937 | Box 131 \ 4 scan0341 | |
| Short memo regarding the supplier of grease used to address internal brake noise. | 5th Jul 1937 | Box 131 \ 4 scan0342 | |
| Distressing complaint letter received from a managing director of a principal retailer. | 5th Jul 1937 | Box 131 \ 4 scan0343 | |
| Private and confidential letter from Hooper & Co. to Rolls-Royce detailing numerous serious faults on recently delivered cars. | 1st Jul 1937 | Box 131 \ 4 scan0344 | |
| Customer complaints and reliability issues with various car models, including the Phantom III and Bentley. | 1st Jul 1937 | Box 131 \ 4 scan0345 | |
| Page 3 of a letter detailing reliability concerns and performance issues with the Phantom III and 25/30 models. | 5th Jul 1937 | Box 131 \ 4 scan0346 | |
| Cause of an over-oiling issue on the Phantom III model, with handwritten comments. | 5th Jul 1937 | Box 131 \ 4 scan0347 | |
| Tests and modifications to resolve an overoiling complaint on a Bentley B.122.GA. | 6th Jul 1937 | Box 131 \ 4 scan0348 | |
| Excessive oil consumption in Bentley cars, owner habits, and recommended solutions. | 7th Jul 1937 | Box 131 \ 4 scan0349 | |
| The investigation of excessive oil consumption in a Bentley B.244.GA. | 7th Jul 1937 | Box 131 \ 4 scan0350 | |
| Engine improvements, piston ring issues, and comparative data from other manufacturers like Bugatti. | 9th Jul 1937 | Box 131 \ 4 scan0351 | |
| Explaining the operation of electrical petrol pumps and the effect of pressure on their function. | 9th Jul 1937 | Box 131 \ 4 scan0352 | |
| Brief typed memo confirming a return to 'K' and a planned arrival in Derby. | 10th Jul 1937 | Box 131 \ 4 scan0353 | |
| Modifying the Phantom II's heavy exhaust valves to reduce noise. | 25th Jun 1937 | Box 131 \ 4 scan0354 | |
| Depot modification to heavy exhaust valves for the Phantom II model to overcome quietening issues. | 30th Jun 1937 | Box 131 \ 4 scan0355 | |
| Summary of the design history and issues with Phantom II exhaust valves. | 29th Jun 1937 | Box 131 \ 4 scan0356 | |
| Clarifying the cost of 6 modified Phantom II exhaust valves. | 24th Jun 1937 | Box 131 \ 4 scan0357 | |
| Short memo regarding internal brake noise and sourcing grease suppliers from Cricklewood. | 5th Jul 1937 | Box 131 \ 4 scan0358 | |
| Heavy oil consumption under French conditions and plans for testing new high-pressure pistons. | 10th Jul 1937 | Box 131 \ 4 scan0359 | |
| The investigation into excessive oil consumption for a Bentley B.244.GA at 15,000 miles. | 7th Jul 1937 | Box 131 \ 4 scan0360 | |
| Analysis of engine improvements concerning piston rings, oil consumption, and cylinder distortion, with notes on Bugatti's engine. | 6th Jul 1937 | Box 131 \ 4 scan0361 | |
| Overoiling complaint for Mr. Lang's Bentley B.122.GA, including test results. | 6th Jul 1937 | Box 131 \ 4 scan0362 | |
| Excessive oil consumption in Bentley cars, potential fixes, and issues with owner oil checks. | 6th Jul 1937 | Box 131 \ 4 scan0363 | |
| Resolving an overoiling complaint and high oil consumption for a Bentley B.122.GA. | 6th Jul 1937 | Box 131 \ 4 scan0364 | |
| Oil consumption issues, piston modifications, and oil level checking procedures for Bentley cars. | 6th Jul 1937 | Box 131 \ 4 scan0365 | |
| Rectifying an overoiling complaint on a Bentley B.122.GA, including test results. | 6th Jul 1937 | Box 131 \ 4 scan0366 | |
| Excessive oil consumption in Bentley cars, proposed solutions, and handwritten notes disputing the findings. | 16th Jul 1937 | Box 131 \ 4 scan0367 | |
| Bentley B.35.KU oil consumption tests at high speeds on Brooklands track. | 16th Jul 1937 | Box 131 \ 4 scan0368 | |
| Delay in obtaining new springs for a Bentley pivoted brake shoe and suggesting an alternative supplier. | 27th Jul 1937 | Box 131 \ 4 scan0369 | |
| Instruction regarding a .002 inch nip for Bentley connecting rod and main bearings to prevent loosening. | 28th Jul 1937 | Box 131 \ 4 scan0370 | |
| Querying why Bentley con rod bearings require filing to fit the housing. | 29th Jul 1937 | Box 131 \ 4 scan0371 | |
| Bentley service complaints, listing faults and the corresponding actions taken. | 29th Jul 1937 | Box 131 \ 4 scan0372 | |
| Vehicle faults and the corresponding corrective actions or investigations. | 29th Jul 1937 | Box 131 \ 4 scan0373 | |
| Two-column document listing reported faults and the corresponding corrective actions taken. | 29th Jul 1937 | Box 131 \ 4 scan0374 | |
| Over-oiling issue on the Phantom III model on the Continent. | 30th Jul 1937 | Box 131 \ 4 scan0375 | |
| Reconditioning and supply of Phantom III oil coolers. | 1st Nov 1937 | Box 131 \ 5 scan0001 | |
| Testing, repair, and stock levels of coolers, including instructions to depots and suppliers. | 1st Nov 1937 | Box 131 \ 5 scan0002 | |
| Cooling tests carried out on a 1.B.IV. car at Brooklands to determine the optimal bypass pipe size. | 1st Nov 1937 | Box 131 \ 5 scan0003 | |
| Table showing the results of cooling tests carried out on chassis 1 B IV at Brooklands. | 3rd Nov 1937 | Box 131 \ 5 scan0004 | |
| Letter to John Marston Ltd. arranging a visit to inspect modified oil cooler pieces and a car heater proposal. | 3rd Nov 1937 | Box 131 \ 5 scan0005 | |
| Parts and blueprints for the Phantom III Oil Temperature Regulator. | 6th Nov 1937 | Box 131 \ 5 scan0006 | |
| Visit to John Marston Ltd. to discuss oil coolers and related parts. | 8th Nov 1937 | Box 131 \ 5 scan0007 | |
| Letter to John Marston Ltd. confirming an agreement on the supply and specification of oil coolers. | 5th Nov 1937 | Box 131 \ 5 scan0008 | |
| List of instructions regarding tests and modifications on vehicle components, including cores, shutter sets, tanks, and heaters. | 9th Nov 1937 | Box 131 \ 5 scan0009 | |
| Letter detailing test results of sample oil coolers and subsequent production and replacement requirements. | 9th Nov 1937 | Box 131 \ 5 scan0010 | |
| Letter discussing cooler alterations, reconditioning, testing of coolers made from used parts, and a final drawing for a car heater. | 9th Nov 1937 | Box 131 \ 5 scan0011 | |
| Request to send an official order to John Marstons for five Ph.III oil coolers used for destructive testing. | 9th Nov 1937 | Box 131 \ 5 scan0012 | |
| Request for an official order to be placed with John Marstons for five Ph.III oil coolers used for destructive testing. | 9th Nov 1937 | Box 131 \ 5 scan0013 | |
| Tests of sample oil coolers with the latest strengthening modifications. | 10th Nov 1937 | Box 131 \ 5 scan0014 | |
| Cooler testing, detailing failures, and recommendations for future production and reconditioning. | 10th Nov 1937 | Box 131 \ 5 scan0015 | |
| Test results for five sample oil coolers (PH III) with improved soldering and longer tube bulges. | 10th Nov 1937 | Box 131 \ 5 scan0016 | |
| Photograph showing a damaged or sectioned honeycomb radiator core with its pipe connections. | 10th Nov 1937 | Box 131 \ 5 scan0018 | |
| Photograph of a damaged section of a honeycomb radiator core. | 12th Nov 1937 | Box 131 \ 5 scan0019 | |
| To cancel instructions for the Ph.III hydrogen brazed heat exchange due to the introduction of Hall's metal bearings. | 12th Nov 1937 | Box 131 \ 5 scan0020 | |
| Cancelling an instruction to make one set of parts for a Hydrogen Brazed Heat Exchanger for the Phantom 111. | 12th Nov 1937 | Box 131 \ 5 scan0021 | |
| On the potential to eliminate the Phantom III oil cooler by standardising the Aluminium Tin big-end bearing. | 15th Nov 1937 | Box 131 \ 5 scan0022 | |
| Endurance tests for Phantom III bearings and the effects of an oil cooler. | 15th Nov 1937 | Box 131 \ 5 scan0023 | |
| Photograph showing Phantom III No.6 main bearings after a 20-hour endurance test. | 1st Jan 1942 | Box 131 \ 5 scan0024 | |
| Photograph of Phantom III No.6 Unit main bearings after a 21-hour endurance test. | 16th Nov 1937 | Box 131 \ 5 scan0025 | |
| Letter to John Marston Ltd. regarding the delivery of reconditioned matrices and oil coolers, and a report on a failed part. | 16th Nov 1937 | Box 131 \ 5 scan0026 | |
| Letter from John Marston Limited regarding the testing results of oil coolers. | 18th Nov 1936 | Box 131 \ 5 scan0027 | |
| Cooling tests carried out on 'Wraith' cars at Brooklands and Derby. | 24th Nov 1937 | Box 131 \ 5 scan0028 | |
| Conclusions from cooling system tests on the Wraith car. | 24th Nov 1937 | Box 131 \ 5 scan0029 | |
| Report comparing cooling standards and test results with those of General Motors and Vauxhall. | 24th Nov 1937 | Box 131 \ 5 scan0030 | |
| The Wraith car's cooling system, including performance comparisons with a Vauxhall 25.HP car and notes on thermometer placement. | 24th Nov 1937 | Box 131 \ 5 scan0031 | |
| Table of test results showing the effects of different fan types, positions, and speeds on cooling performance and noise levels. | 24th Nov 1937 | Box 131 \ 5 scan0032 | |
| Test results showing the effects of the water pump, undershields, and bonnet flaps on cooling performance at various speeds. | 24th Nov 1937 | Box 131 \ 5 scan0033 | |
| Results of tests on a general cooling system's suitability under various conditions. | 29th Nov 1937 | Box 131 \ 5 scan0034 | |
| Return of a failed Ph.III oil cooler to the supplier for inspection. | 29th Nov 1937 | Box 131 \ 5 scan0035 | |
| Outstanding parts that have been sent on loan. | 30th Nov 1937 | Box 131 \ 5 scan0036 | |
| Of goods forwarded to Messrs. John Marstons Ltd. for an oil cooler matrix unit on loan. | 14th Sep 1937 | Box 131 \ 5 scan0037 | |
| The transfer of an oil cooler matrix unit to Central Stores for return to Messrs John Marstons Ltd. | 18th Sep 1942 | Box 131 \ 5 scan0038 | |
| Deletion of the oil cooler on the Phantom III model to simplify crankcase production. | 2nd Dec 1937 | Box 131 \ 5 scan0039 | |
| Failed oil cooler (No. E.278) from a customer's car which was sent for examination. | 15th Dec 1937 | Box 131 \ 5 scan0040 | |
| Testing a revised assembly procedure for the Phantom III oil cooler to eliminate the need for bedding the union faces. | 15th Dec 1937 | Box 131 \ 5 scan0041 | |
| Return and status of various oil coolers sent to John Marston Ltd. | 15th Dec 1937 | Box 131 \ 5 scan0042 | |
| Oil cooler failures on the Phantom III, requesting a 'dummy steam valve tower'. | 22th Dec 1937 | Box 131 \ 5 scan0043 | |
| The replacement of failing Ph.III old type oil coolers on A & B series cars with the latest F type. | 4th Jan 1938 | Box 131 \ 5 scan0044 | |
| Letter to John Marston Ltd. discussing increased deliveries of oil coolers and the standardisation of Phantom III matrices. | 4th Jan 1938 | Box 131 \ 5 scan0045 | |
| Letter to Messrs. John Marston, Ltd. regarding car heaters and oil cooler drawings. | 4th Jan 1938 | Box 131 \ 5 scan0046 | |
| The supply rate and change-over progress of modified oil coolers for the Phantom III. | 6th Jan 1938 | Box 131 \ 5 scan0047 | |
| Letter regarding a defective reconditioned Phantom III oil cooler being returned due to excessive machining. | 18th Jan 1938 | Box 131 \ 5 scan0048 | |
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