| Description | Date | Identifier | |
| Letter to Messrs. John Marston Ltd. regarding a Bentley III matrix, dummy shutter vanes, and an enclosed drawing. | 18th Jan 1938 | Box 131 \ 5 scan0049 | |
| Requesting information on the process of bedding union faces for oil coolers. | 18th Jan 1938 | Box 131 \ 5 scan0050 | |
| Inspected oil cooler found to be dangerously thin and needing return for replacement. | 18th Jan 1938 | Box 131 \ 5 scan0051 | |
| Proposing the standardization of Hall's Metal Big-end Bearings to replace unreliable oil coolers following successful testing. | 13th Jan 1938 | Box 131 \ 5 scan0052 | |
| Test report on the comparative performance of old and new Phantom III oil coolers under pulsating pressure. | 10th Jan 1938 | Box 131 \ 5 scan0053 | |
| Diagrams comparing failures and leaks in old and new type Phantom III oil coolers. | 6th Jan 1938 | Box 131 \ 5 scan0054 | |
| Letter from John Marston Limited regarding a revised print of drawing H.595 showing the new length of bulge on cooler tubes. | 20th Jan 1938 | Box 131 \ 5 scan0055 | |
| Confirming an improvement in the quality of Phantom III oil coolers and their future acceptability. | 20th Jan 1938 | Box 131 \ 5 scan0056 | |
| Marston's drawing H.595 showing modifications to tubes on 'F' type Ph.III oil coolers. | 24th Jan 1938 | Box 131 \ 5 scan0057 | |
| Telegram to Mr. Dunn at Sunbeam, Wolverhampton, regarding cancelled oil coolers. | 27th Jan 1938 | Box 131 \ 5 scan0058 | |
| Returning a reconditioned Ph.III oil cooler to John Marston Ltd. for examination. | 17th Feb 1938 | Box 131 \ 5 scan0059 | |
| Minimum modifications required for the 25.G.VI cooling system. | 4th Mar 1938 | Box 131 \ 5 scan0060 | |
| The reliability and changes for three types of Phantom III oil coolers. | 8th Apr 1938 | Box 131 \ 5 scan0061 | |
| Requesting information on the supply and fitting of 'F' type oil coolers for various car series. | 8th Apr 1938 | Box 131 \ 5 scan0062 | |
| The supply and re-machining of Phantom III Oil Cooler Changeovers from supplier Messrs. Marston. | 14th Apr 1938 | Box 131 \ 5 scan0063 | |
| Stock levels and fitting rate for Phantom III oil coolers. | 14th Apr 1938 | Box 131 \ 5 scan0064 | |
| Proposal to abandon the Phantom III oil cooler and test an experimental car without one. | 20th Apr 1938 | Box 131 \ 5 scan0065 | |
| Changes and failures of Phantom III oil coolers. | 23th Apr 1938 | Box 131 \ 5 scan0066 | |
| Overheating issues and potential design limitations of the Phantom III model's cooling system. | 26th Apr 1938 | Box 131 \ 5 scan0067 | |
| Guide to diagnosing and testing overheating issues in Phantom III cars. | 26th Apr 1938 | Box 131 \ 5 scan0068 | |
| Guidance on diagnosing and addressing vehicle overheating issues. | 26th Apr 1938 | Box 131 \ 5 scan0069 | |
| Phantom III oil cooler failures and proposing a change to a more reliable type. | 10th Mar 1938 | Box 131 \ 5 scan0070 | |
| Further endurance tests carried out on 'F' type coolers. | 10th May 1938 | Box 131 \ 5 scan0071 | |
| Summary of oil cooler failure data, analysing car months run against failures for different cooler types. | 29th Apr 1938 | Box 131 \ 5 scan0072 | |
| Fatigue test results for the Phantom III oil cooler. | 29th Apr 1938 | Box 131 \ 5 scan0073 | |
| Inquiry regarding how drivers discover oil cooler failures on Phantom III cars. | 12th May 1938 | Box 131 \ 5 scan0074 | |
| Request to manufacture parts for testing a hydrogen brazed cooler. | 12th May 1938 | Box 131 \ 5 scan0075 | |
| Confirming a photograph has been taken of a faulty oil cooler. | 13th May 1938 | Box 131 \ 5 scan0076 | |
| Symptoms of oil cooler failure in the Phantom III engine. | 14th May 1938 | Box 131 \ 5 scan0077 | |
| Letter to John Marston Ltd. regarding oil cooler reconditioning charges, clarifying a previous visit date. | 16th May 1938 | Box 131 \ 5 scan0078 | |
| Analysis of an 'F' Type oil cooler failure on Chassis 3.BU.26. | 17th May 1938 | Box 131 \ 5 scan0079 | |
| The failure of a 'P' type oil cooler, attributing the cause to incorrect fitting. | 17th May 1938 | Box 131 \ 5 scan0080 | |
| Sketch demonstrating the correct and incorrect use of washers on a failed 'F' type oil cooler. | 17th May 1938 | Box 131 \ 5 scan0081 | |
| From Sg to Rm chasing up a resolution on contradictory papers regarding the Phantom III Oil Cooler. | 20th May 1938 | Box 131 \ 5 scan0082 | |
| The failure of 'F' type oil coolers and an agreement on changing to a different series. | 20th May 1938 | Box 131 \ 5 scan0083 | |
| Confirming that a faulty oil cooler from a test rig has been photographed. | 26th May 1938 | Box 131 \ 5 scan0084 | |
| Laboratory report on a faulty oil cooler from a water pump and timing gear attachment on a test rig. | 26th May 1938 | Box 131 \ 5 scan0085 | |
| Examination and return of five Phantom III oil coolers following testing. | 27th May 1938 | Box 131 \ 5 scan0086 | |
| Dispatch of a failed oil cooler for examination by a third party. | 14th Jun 1938 | Box 131 \ 5 scan0087 | |
| Failures in 'F' type oil coolers on the Ph.III car and proposing solutions. | 20th Jun 1938 | Box 131 \ 5 scan0088 | |
| Visit to John Marston Ltd. to investigate oil cooler failures and compare manufacturing methods. | 28th Jun 1938 | Box 131 \ 5 scan0089 | |
| Adoption of an improved building method for replacement coolers by Messrs. Marstons. | 28th Jun 1938 | Box 131 \ 5 scan0090 | |
| Charges from John Marston Ltd. for the modification of oil coolers. | 12th Jul 1938 | Box 131 \ 5 scan0091 | |
| Letter to John Marston Ltd. requesting the return of a failed type 'F' oil cooler for examination. | 18th Jul 1938 | Box 131 \ 5 scan0092 | |
| Cracked Phantom III oil cooler casing and its poor die-cast material quality. | 21th Jul 1938 | Box 131 \ 5 scan0093 | |
| Material analysis report for an Oil Cooler Casing, finding it to be a poor and brittle die-cast alloy. | 19th Jul 1938 | Box 131 \ 5 scan0094 | |
| Faulty Phantom 111 Oil Cooler casting due to the use of low-grade, non-specified material. | 2nd Aug 1938 | Box 131 \ 5 scan0095 | |
| Urging action on changing C series dip soldered 'F' type oil coolers due to repeated failures. | 12th Aug 1938 | Box 131 \ 5 scan0096 | |
| Information on cooler failures and changeover costs. | 16th Aug 1938 | Box 131 \ 5 scan0097 | |
| Oil cooler failures, types, replacement costs, and specific vehicle instances. | 17th Aug 1938 | Box 131 \ 5 scan0098 | |
| Investigation into an overheating complaint for a Phantom III, chassis 3.AZ.216. | 26th Aug 1938 | Box 131 \ 5 scan0099 | |
| Inquiry following a visit from John Marston Ltd. regarding accumulated charges for the modification of Oil Coolers. | 12th Sep 1938 | Box 131 \ 5 scan0100 | |
| Letter from the Experimental Dept. to Chromates Ltd. requesting a sample of 'Crowbar' corrosion inhibitor for testing. | 28th Oct 1938 | Box 131 \ 5 scan0101 | |
| The failures of oil coolers for the Phantom III model. | 2nd Nov 1938 | Box 131 \ 5 scan0102 | |
| Recommending the removal of oil coolers from all Ph.III chassis and requesting reports on big end bearings. | 7th Nov 1938 | Box 131 \ 5 scan0103 | |
| Requesting a shock test on Phantom III oil coolers using a shock absorber test rig. | 8th Nov 1938 | Box 131 \ 5 scan0104 | |
| Oil cooler failures on the Ph.III 35-EX car and requests for tests on a proposed modification. | 8th Nov 1938 | Box 131 \ 5 scan0105 | |
| Oil cooler failures and big end bearing conditions on Phantom III cars. | 11th Nov 1938 | Box 131 \ 5 scan0106 | |
| Potential abandonment of the oil cooler on all Phantom III chassis due to failures. | 15th Nov 1938 | Box 131 \ 5 scan0107 | |
| Oil cooler failures and big end bearings on the Phantom III model. | 17th Nov 1938 | Box 131 \ 5 scan0108 | |
| Return and scrapping of ten experimental oil coolers supplied by John Marston Ltd. | 9th Dec 1938 | Box 131 \ 5 scan0109 | |
| Disposal of a displaced 'F' type oil cooler from a Phantom III car. | 21th Dec 1938 | Box 131 \ 5 scan0110 | |
| Laboratory report on the chemical composition of deposits from water pump casings. | 30th Dec 1938 | Box 131 \ 5 scan0111 | |
| Replacement of Phantom III oil coolers and noting another failure. | 4th Jan 1939 | Box 131 \ 5 scan0112 | |
| Outlining the policy to remove oil coolers from Phantom III cars. | 5th Jan 1939 | Box 131 \ 5 scan0113 | |
| Analysing the cooling system to lighten the chassis, concluding that pressure cooling is the best approach. | 13th Jan 1939 | Box 131 \ 5 scan0114 | |
| Investigation into the pros and cons of using Glycol or Pressure water cooling for car engines, based on experience from aero applications. | 5th Dec 1938 | Box 131 \ 5 scan0115 | |
| Engine cooling systems, comparing Ethylene Glycol and pressure cooling methods. | 6th Dec 1938 | Box 131 \ 5 scan0116 | |
| Engine cooling systems, radiator reliability, pressure cooling, and the use of Ethylene Glycol. | 5th Dec 1938 | Box 131 \ 5 scan0117 | |
| Detonation tests comparing water and glycol coolants at various temperatures in a Bentley car. | 5th Dec 1938 | Box 131 \ 5 scan0118 | |
| Pros and cons of ethylene glycol versus pressure cooling systems for vehicle engines. | 5th Dec 1938 | Box 131 \ 5 scan0119 | |
| Graph comparing oil dissipation and pressure drop for two different cooler core designs. | 11th Jul 1939 | Box 131 \ 5 scan0120 | |
| Development and testing of a pressure cooling system, detailing component status and manufacturing considerations for the matrix. | 11th Jul 1939 | Box 131 \ 5 scan0121 | |
| Requesting a diagrammatic view of the water circulating system for the B.V. shop manual. | 17th Jul 1939 | Box 131 \ 5 scan0122 | |
| Letter from S. Smith & Sons regarding a thermostatic pressure release for a cooling system. | 29th Jan 1940 | Box 131 \ 5 scan0123 | |
| Letter to Messrs. S. Smith & Sons requesting a sample thermostatic pressure release valve for testing. | 1st Feb 1940 | Box 131 \ 5 scan0124 | |
| Letter from a supplier discussing the copper brazing process for an oil cooler assembly. | 13th Mar 1940 | Box 131 \ 5 scan0125 | |
| Letter to Mr. Stephenson of Wilmot-Breeden Ltd. regarding the progress of oil cooler hydrogen brazing and readiness for experimental testing. | 14th Mar 1940 | Box 131 \ 5 scan0126 | |
| Letter to Wilmot-Breeden Ltd. discussing a second oil cooler sample, testing plans, patent position, and other matters. | 14th Mar 1940 | Box 131 \ 5 scan0127 | |
| Page 2 of a letter to C.L. Breeden regarding a visit to inspect a newly fitted and rattling car lock. | 14th Mar 1940 | Box 131 \ 5 scan0128 | |
| Dispatch of three oil coolers for examination. | 29th Mar 1940 | Box 131 \ 5 scan0129 | |
| Letter from Wilmot-Breeden Ltd. requesting the return of an unsuccessful brazed oil cooler assembly. | 29th Mar 1940 | Box 131 \ 5 scan0130 | |
| Letter to Messrs Wilmot Breedon Ltd. confirming the dispatch of oil coolers. | 30th Mar 1940 | Box 131 \ 5 scan0131 | |
| Summary of testing work and modifications for the cooling system, specifically for the water pump and fans. | 3rd May 1940 | Box 131 \ 5 scan0132 | |
| Identifying a defect of low under-bonnet temperature in the Ripplet's fixed shutter cooling system and proposing a solution. | 10th Jun 1940 | Box 131 \ 5 scan0133 | |
| Confirming that only one oil cooler, a Serck No.D.94906, has been tested in the last twelve months. | 18th Jul 1940 | Box 131 \ 5 scan0134 | |
| Letter to Humber Ltd. regarding issues with soldered type oil coolers and enclosing a catalogue for an alternative construction. | 27th Jul 1940 | Box 131 \ 5 scan0135 | |
| Providing particulars of heat exchanges for oil and water in response to a message about Harrison matrices. | 29th Jul 1940 | Box 131 \ 5 scan0136 | |
| Letter from Humber Limited regarding issues with a soldered tube cooler and alternative solutions. | 31th Jul 1940 | Box 131 \ 5 scan0137 | |
| Concluding page of a letter from Humber Limited, with signature and note about a returned catalogue. | 30th Mar 1940 | Box 131 \ 5 scan0138 | |
| Monthly report on the cooling system, detailing rig and road test results for various heater fan configurations. | 30th Mar 1940 | Box 131 \ 5 scan0139 | |
| Development progress and issues with heaters, bonnets, and water pumps. | 30th Mar 1940 | Box 131 \ 5 scan0140 | |
| Progress report on tests and development for belts, pulleys, dash boards, pressure cooling, radiators, and fans. | 30th Mar 1940 | Box 131 \ 5 scan0141 | |
| Modifications and testing for thermostats, undershields, radiator mountings, hose connections, and test bed work. | 7th Nov 1940 | Box 131 \ 5 scan0142 | |
| Summary table of critical air temperature tests for experimental cars. | 7th Nov 1940 | Box 131 \ 5 scan0143 | |
| Table detailing the critical air temperatures (c.a.t.) of various experimental cars under different conditions. | 7th Nov 1940 | Box 131 \ 5 scan0144 | |
| Coolant pump rig tests to investigate and reproduce bearing failures. | 7th Jul 1941 | Box 131 \ 5 scan0145 | |
| Pump bearing failures, discussing corrosion, temperature, and gland leakage issues. | 7th Jul 1941 | Box 131 \ 5 scan0146 | |
| Secret memo proposing the development of a rubber crankshaft damper for a 6-cylinder engine as a Phoenix project. | 18th Nov 1937 | Box 132 \ 1 scan0001 | |
| Preliminary leaflet from Metalastik Ltd. of Leicester, with an attached business card. | 1st Jan 1937 | Box 132 \ 1 scan0002 | |
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