| Description | Date | Identifier | |
| Tests and observations on a pressure cooling system, including performance at Brooklands and proposed modifications. | 1st Sep 1937 | Box 131 \ 1 scan0311 | |
| On developing a high-pressure cooling system with a simplified temperature gauge for customers. | 1st Sep 1937 | Box 131 \ 1 scan0312 | |
| Summary of radiator suitability tests for a Phantom III Continental car at Brooklands. | 6th Aug 1937 | Box 131 \ 1 scan0313 | |
| Letter from John Marston Ltd. regarding a strengthened oil cooler and radiators for Bentley and Wraith models. | 3rd Sep 1937 | Box 131 \ 1 scan0314 | |
| Letter to John Marston Ltd. regarding oil coolers and radiators, discussing specifications, pricing, and testing. | 6th Sep 1937 | Box 131 \ 1 scan0315 | |
| Failure of hand-soldered coolers and the transition to dipped coolers from a specific serial number. | 6th Sep 1937 | Box 131 \ 1 scan0316 | |
| Investigation and scrapping of failed oil coolers and future policy. | 6th Sep 1937 | Box 131 \ 1 scan0317 | |
| Investigation into oil cooler failures, phase three. | 7th Sep 1937 | Box 131 \ 1 scan0318 | |
| The comparative strength testing of new dip soldered type oil coolers versus old type coolers. | 7th Sep 1937 | Box 131 \ 1 scan0319 | |
| Suggestion for a pressure test on the lines to prevent oil cooler failures. | 7th Sep 1937 | Box 131 \ 1 scan0320 | |
| Procedure for cleaning oil from the water system after an oil cooler failure on a Phantom III vehicle. | 7th Sep 1937 | Box 131 \ 1 scan0321 | |
| Letter from a supplier concerning the repair and return of Oil Cooler No. E.278. | 7th Sep 1937 | Box 131 \ 1 scan0322 | |
| Outlining the requirements and apparatus for pressure testing Phantom III oil coolers. | 7th Sep 1937 | Box 131 \ 1 scan0323 | |
| Confirming an oil cooler matrix from chassis 3-CP-16 has been handed over for examination. | 8th Sep 1937 | Box 131 \ 1 scan0324 | |
| Sending an experimental oil cooler for return to John Marston Ltd. for repair. | 9th Sep 1937 | Box 131 \ 1 scan0325 | |
| Confirmation of receipt for a failed oil cooler No. E.183, which was removed from 3.CP.16. | 11th Sep 1937 | Box 131 \ 1 scan0326 | |
| Arranging for serial numbers to be affixed to the oil cooler matrix unit. | 13th Sep 1937 | Box 131 \ 1 scan0327 | |
| Sending an oil cooler matrix unit to Central Stores for return to a third party. | 13th Sep 1937 | Box 131 \ 1 scan0328 | |
| Letter to John Marston Ltd. detailing the fatigue test results of an experimental oil cooler. | 13th Sep 1937 | Box 131 \ 1 scan0329 | |
| Page 2 of a letter regarding the testing and modification of soldered coolers. | 14th Sep 1937 | Box 131 \ 1 scan0330 | |
| Letter from John Marston Limited regarding the testing, modification, and serial numbering of oil coolers. | 14th Sep 1937 | Box 131 \ 1 scan0331 | |
| Internal request to fit a new dip-soldered oil cooler to car 37-EX. | 14th Sep 1937 | Box 131 \ 1 scan0332 | |
| Urgent request for information on Phantom III chassis in service and their mileage due to oil cooler failures. | 14th Sep 1937 | Box 131 \ 1 scan0333 | |
| Request for an up-to-date list of all oil cooler failures on Phantom III chassis. | 14th Sep 1937 | Box 131 \ 1 scan0334 | |
| Letter to John Marston Ltd. regarding oil cooler failures on Phantom III cars due to defective soldering. | 16th Sep 1937 | Box 131 \ 1 scan0335 | |
| List of oil cooler failures for the Phantom III. | 16th Sep 1937 | Box 131 \ 1 scan0336 | |
| Inquiring about an updated list of oil cooler failures and a specific unlisted case. | 17th Sep 1937 | Box 131 \ 1 scan0337 | |
| Blueprints and a parts list for the Phantom 111 air pressure testing gear and oil coolers. | 20th Sep 1937 | Box 131 \ 1 scan0338 | |
| Confirming an extra blueprint has been sent for use as an instruction notice and for transmission to Benton & Stone. | 20th Sep 1937 | Box 131 \ 1 scan0339 | |
| Letter to the Harrison Radiator Corporation about oil cooler failures on the Phantom III car and a request for hydrogen brazed coolers. | 6th Oct 1937 | Box 131 \ 1 scan0340 | |
| Page 2 of a letter concerning the purchase of oil coolers. | 6th Oct 1937 | Box 131 \ 1 scan0341 | |
| The trial of an American hydrogen brazed oil cooler on a Ph.III model. | 6th Oct 1937 | Box 131 \ 1 scan0342 | |
| Letter to John Marston Ltd. arranging a visit to discuss overheating on Mk VI cores and outlining testing procedures. | 7th Oct 1937 | Box 131 \ 1 scan0343 | |
| Follow-up letter regarding the yet-to-be-received Ph.III Mk.VI block with a dip-soldered bottom tank. | 8th Oct 1937 | Box 131 \ 1 scan0344 | |
| Instructions for fitting various Negretti and Zambra thermometers to a 26-G-VI car for cooling system suitability tests at Brooklands. | 8th Oct 1937 | Box 131 \ 1 scan0345 | |
| Request to conduct a pressure 'test to destruction' on converted Ph.III oil coolers compared to standard production models. | 12th Oct 1937 | Box 131 \ 1 scan0346 | |
| Instructing to fit an oil cooler short circuiting pipe and thermometer from vehicle 32-EX onto 37-EX. | 18th Oct 1937 | Box 131 \ 1 scan0347 | |
| Letter to John Marston Ltd. regarding the supply, testing, and delivery of oil cooler matrices. | 18th Oct 1937 | Box 131 \ 1 scan0348 | |
| Typed letter arranging a visit to Brooklands and the Motor Show. | 19th Oct 1937 | Box 131 \ 1 scan0349 | |
| Cooling system tests for car 32-EX at Brooklands, focusing on radiator heat dissipation and the oil temperature regulator. | 19th Oct 1937 | Box 131 \ 1 scan0350 | |
| Conclusions from tests on overdrive gear, cooling system performance, and matrix blockages. | 19th Oct 1937 | Box 131 \ 1 scan0351 | |
| Standardisation of fans, gearboxes, and oil coolers to address overheating issues. | 19th Oct 1937 | Box 131 \ 1 scan0352 | |
| Results of cooling system tests on a 32 Ex. Car at various stages of mileage. | 19th Oct 1937 | Box 131 \ 1 scan0353 | |
| Heat dissipation tests for various car radiator matrices, comparing performance at different speeds and after mileage. | 19th Oct 1937 | Box 131 \ 1 scan0354 | |
| Visit to Messrs. John Marston Ltd. regarding the failure and conversion of oil coolers. | 19th Oct 1937 | Box 131 \ 1 scan0355 | |
| Defects and proposed modifications for coolers, specifically addressing tube and casing issues. | 19th Oct 1937 | Box 131 \ 1 scan0356 | |
| Flow and dissipation tests of various radiator matrices, including examinations for silting, choking and defects. | 19th Oct 1937 | Box 131 \ 1 scan0357 | |
| Blueprint illustrating discrepancies between a cooler casing and a tube end across two figures. | 19th Oct 1937 | Box 131 \ 1 scan0358 | |
| Heat dissipation test results for various Mk VI matrices carried out at John Marstons' plant in Wolverhampton. | 23th Oct 1937 | Box 131 \ 1 scan0359 | |
| Letter from John Marston Limited concerning heat dissipation tests, oil coolers, and a Bentley shutter set. | 23th Oct 1937 | Box 131 \ 1 scan0360 | |
| The horse power dissipated by Mark VI engine blocks under different conditions. | 23th Oct 1937 | Box 131 \ 1 scan0361 | |
| Letter to Messrs. John Marston Ltd. discussing heat dissipation test results for defective engine cores. | 28th Oct 1937 | Box 131 \ 1 scan0362 | |
| Oil cooler test failures and quality control issues with a Bentley Dummy Shutter set. | 28th Oct 1937 | Box 131 \ 1 scan0363 | |
| Letter regarding the return of a defective shutter set for correction to establish a production standard. | 29th Oct 1937 | Box 131 \ 1 scan0364 | |
| Modifications to the Wraith cooling system fan based on recent tests. | 29th Oct 1937 | Box 131 \ 1 scan0365 | |
| Suggestion to improve the Bentley Oil Gauge by making the connecting link from steel for increased stiffness. | 21th Jun 1937 | Box 131 \ 2 scan0001 | |
| Trying rings in the carburetter flange joint on a 4 1/4 Bentley. | 5th Jul 1937 | Box 131 \ 2 scan0002 | |
| Investigation report regarding Bentley connecting rods and bearing shells. | 3rd Aug 1937 | Box 131 \ 2 scan0003 | |
| Sketches to resolve an over-run explosion in the silencer for a 25/30 HP model. | 5th Aug 1937 | Box 131 \ 2 scan0004 | |
| Investigation into K.L.G. FE.30 plugs on a Phantom III belonging to the Duke of Sutherland. | 5th Aug 1937 | Box 131 \ 2 scan0005 | |
| Type of grease used for the lubrication of mechanical features inside brake drums. | 5th Aug 1937 | Box 131 \ 2 scan0006 | |
| The failure of the Phantom III radiator ball valve plug and a proposed solution. | 10th Aug 1937 | Box 131 \ 2 scan0007 | |
| The failure of the Phantom III front brake operating lever G.83302. | 10th Aug 1937 | Box 131 \ 2 scan0008 | |
| Fault with a Bentley propeller shaft spindle and its roller bearings. | 10th Aug 1937 | Box 131 \ 2 scan0009 | |
| Service and owner complaints for the Phantom III, detailing faults reported and the corrective actions given. | 11th Aug 1937 | Box 131 \ 2 scan0010 | |
| List of reported vehicle faults and the corresponding corrective actions taken. | 11th Aug 1937 | Box 131 \ 2 scan0011 | |
| Phantom II chassis regarding excessive valve noise and the results of a modification with lightened exhaust valves. | 13th Aug 1937 | Box 131 \ 2 scan0012 | |
| Front brake stop system on the Phantom III, including a proposed modification with a diagram. | 13th Aug 1937 | Box 131 \ 2 scan0013 | |
| The arrival of chassis 3.BT.93 for Mr. G. Spencer and a scheduled clutch inspection. | 16th Aug 1937 | Box 131 \ 2 scan0014 | |
| Examination of K.L.G. FE.30 spark plugs on two Phantom III chassis. | 16th Aug 1937 | Box 131 \ 2 scan0015 | |
| Cover sheet for a report on transmission failures. | 17th Aug 1937 | Box 131 \ 2 scan0016 | |
| Log of transmission failures categorized by 'Driver Dogs' and 'Road Shafts'. | 5th Jul 1937 | Box 131 \ 2 scan0017 | |
| Record of transmission and road shaft failures with associated vehicle and owner details. | 11th Aug 1937 | Box 131 \ 2 scan0018 | |
| Two separate shaft failures, detailing vehicle information, failure dates, mileage, and repair history. | 11th Aug 1937 | Box 131 \ 2 scan0019 | |
| Oil consumption tests on a Bentley chassis after fitting a larger oil pump. | 17th Aug 1937 | Box 131 \ 2 scan0020 | |
| Engine modification to a 3.5 litre engine and subsequent road test results. | 19th Aug 1937 | Box 131 \ 2 scan0021 | |
| Service procedures for 25/30 HP & Bentley engines regarding cylinders and piston rings. | 19th Aug 1937 | Box 131 \ 2 scan0022 | |
| Step-by-step guide for the operations involved in lowering a cylinder block onto pistons. | 19th Aug 1937 | Box 131 \ 2 scan0023 | |
| Schematic drawing of a mechanical component with six numbered ports or cylinders. | 19th Aug 1937 | Box 131 \ 2 scan0024 | |
| Requesting a set of the latest brake linings for a car with brake squeaks. | 19th Aug 1937 | Box 131 \ 2 scan0025 | |
| Light valve issue following talks with Hancock and customer complaints. | 19th Aug 1937 | Box 131 \ 2 scan0026 | |
| Review of the lightening of Phantom II exhaust valves to overcome noise issues. | 19th Aug 1937 | Box 131 \ 2 scan0027 | |
| Issues and modifications to Lucas WT horns. | 19th Aug 1937 | Box 131 \ 2 scan0028 | |
| Confirming the despatch of B.2. brake linings for a Bentley experiencing bad brake squeaks. | 21th Aug 1937 | Box 131 \ 2 scan0029 | |
| Noisy new roller bearing on a 25/30 HP dynamo, suggesting better lubrication or a larger bearing is needed. | 22th Aug 1937 | Box 131 \ 2 scan0030 | |
| Broken make and break spring from a Phantom III chassis. | 24th Aug 1937 | Box 131 \ 2 scan0031 | |
| Design change for the Bentley Chassis rear front shackle pin to allow for easier withdrawal. | 24th Aug 1937 | Box 131 \ 2 scan0032 | |
| Design change to improve accessibility of the Bentley chassis rear front shackle pin. | 24th Aug 1937 | Box 131 \ 2 scan0033 | |
| Causes of the Front Brake Dumb Bell failure on the Phantom III model. | 25th Aug 1937 | Box 131 \ 2 scan0034 | |
| Continued memorandum discussing the breakage of a dumb bell due to continual bending at the neck. | 25th Aug 1937 | Box 131 \ 2 scan0035 | |
| Blueprint illustrating the fouling and shearing action of a dumbbell component within its spherical seating. | 21th Aug 1937 | Box 131 \ 2 scan0036 | |
| Blueprint diagram illustrating a fault with the back of the front brake shoe mechanism. | 21th Aug 1937 | Box 131 \ 2 scan0037 | |
| The marking of engine modifications with the letters A.B.C. | 26th Aug 1937 | Box 131 \ 2 scan0038 | |
| Complaint about stripped threads on the Phantom III hydraulic tappet filter body cover. | 27th Aug 1937 | Box 131 \ 2 scan0039 | |
| Confirming a design change for Bentley Bumper Studs. | 26th Aug 1937 | Box 131 \ 2 scan0040 | |
| Failure analysis report on a broken 'Make & Break' spring from a Phantom III, identifying under-tempering as the cause. | 30th Aug 1937 | Box 131 \ 2 scan0041 | |
| Overheating thrust race removed from vehicle B.114.GA after 14,234 miles. | 1st Sep 1937 | Box 131 \ 2 scan0042 | |
| The performance of Fabroil timing gears in a car after 10,085 miles. | 2nd Sep 1937 | Box 131 \ 2 scan0043 | |
| The examination and noted faults of a failed Bentley petrol pump RB.2005. | 8th Sep 1937 | Box 131 \ 2 scan0044 | |
| Correcting clearance issues on Bentley rear axle thrust races. | 9th Sep 1937 | Box 131 \ 2 scan0045 | |
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