| Description | Date | Identifier | |
| Undersized oil pumps on the Bentley and Phantom II models, suggesting a comparison and potential increase in size. | 8th Feb 1937 | Box 149 \ 2 scan0136 | |
| Troubles with large helical oil pumps and proposing design reconsiderations. | 9th Feb 1937 | Box 149 \ 2 scan0137 | |
| Investigation into the failure of a Bentley oil pump and proposed dimensional changes. | 9th Feb 1937 | Box 149 \ 2 scan0138 | |
| Note to release production modifications for oil pumps, held up pending investigations into priming difficulties. | 9th Feb 1937 | Box 149 \ 2 scan0139 | |
| Instructions for making and modifying Bentley oil pumps. | 11th Feb 1937 | Box 149 \ 2 scan0140 | |
| Oil pump tests for Bentley, detailing performance with different gears and casings. | 12th Feb 1937 | Box 149 \ 2 scan0141 | |
| Test report comparing the performance of different gear and casing combinations for pumps. | 12th Feb 1937 | Box 149 \ 2 scan0142 | |
| Test report comparing the performance of straight and helical gears in aluminium and brass casings. | 12th Feb 1937 | Box 149 \ 2 scan0143 | |
| Test results for various gear and pump casing configurations, measuring priming times under different conditions. | 12th Feb 1937 | Box 149 \ 2 scan0144 | |
| Noting a preferred pump modification and specifications for a bush and casing. | 12th Feb 1937 | Box 149 \ 2 scan0145 | |
| Updating the position on the fitting and despatch of Bentley Oil Pumps. | 18th Feb 1937 | Box 149 \ 2 scan0146 | |
| Confirming the dispatch schedule for Bentley oil pumps and pipes to the Paris Depot. | 27th Feb 1937 | Box 149 \ 2 scan0147 | |
| The production and despatch of 30 large capacity Bentley oil pumps to Paris. | 4th Mar 1937 | Box 149 \ 2 scan0148 | |
| Requesting modification of the driving gear bush flange on an oil pump. | 4th Mar 1937 | Box 149 \ 2 scan0149 | |
| Testing procedures and supply of Bentley oil pumps to Paris. | 24th Mar 1937 | Box 149 \ 2 scan0150 | |
| Testing procedures for a delivery system and relief valve, specifying pressure, flow, and temperature parameters. | 24th Mar 1937 | Box 149 \ 2 scan0151 | |
| The usefulness of specific Bentley oil pumps. | 5th Apr 1937 | Box 149 \ 2 scan0152 | |
| Standardisation of parts for an increased capacity oil pump on the 25/30 HP model. | 5th Mar 1937 | Box 149 \ 2 scan0153 | |
| Modification note for the 'R2' Series chassis confirming no extra tooling cost. | 8th Nov 1923 | Box 149 \ 2 scan0154 | |
| Querying the usability of specific Bentley oil pumps, with a handwritten and later amended response. | 5th Apr 1937 | Box 149 \ 2 scan0155 | |
| The fitting of large capacity oil pumps to 4 1/4 Litre Bentley chassis in France. | 20th May 1937 | Box 149 \ 2 scan0156 | |
| Requesting tests on a Bentley oil pump regarding oil pressure loss. | 4th Jun 1937 | Box 149 \ 2 scan0157 | |
| Investigation into the cause of Bentley oil pump rattle and the results of three corrective tests. | 8th Jun 1937 | Box 149 \ 2 scan0158 | |
| Oil pressure test results at various RPMs and configurations. | 8th Jun 1937 | Box 149 \ 2 scan0159 | |
| Query regarding the production introduction date for a standardised large oil pump. | 26th Jun 1937 | Box 149 \ 2 scan0160 | |
| The introduction and standardisation of a large capacity Bentley oil pump with helical gears. | 29th Jun 1937 | Box 149 \ 2 scan0161 | |
| Querying a chassis number in relation to a larger capacity Bentley oil pump. | 3rd Jul 1937 | Box 149 \ 2 scan0162 | |
| Confirming the chassis and unit numbers for the first fitments of increased capacity Bentley oil pumps. | 5th Jul 1937 | Box 149 \ 2 scan0163 | |
| The supply schedule for 45 larger Bentley oil pumps. | 9th Jul 1937 | Box 149 \ 2 scan0164 | |
| Investigation and work on a Bentley chassis regarding an oil consumption complaint, including the trial of a larger oil pump. | 17th Aug 1937 | Box 149 \ 2 scan0165 | |
| 3.5-litre engine modification and subsequent road test results. | 17th Sep 1937 | Box 149 \ 2 scan0166 | |
| Rejection of a simplified oil level indicator and proposals for alternative schemes. | 17th Sep 1937 | Box 149 \ 2 scan0167 | |
| Instruction regarding the oil pump for the Wraith III Chassis, Section 5170. | 24th Sep 1937 | Box 149 \ 2 scan0168 | |
| Ordering six sets of parts for the Wraith III chassis oil pump on dash. | 12th Oct 1937 | Box 149 \ 2 scan0169 | |
| Depot sheet detailing modifications to address high oil consumption after fitting a larger oil pump on a Bentley. | 19th Oct 1937 | Box 149 \ 2 scan0170 | |
| Depot sheet concerning main bearing failures and replacement procedures for the 4¼ Litre Bentley. | 19th Oct 1937 | Box 149 \ 2 scan0171 | |
| Depot sheet memo regarding the replacement procedure for Bentley pistons. | 19th Oct 1937 | Box 149 \ 2 scan0172 | |
| Complaint of wear on oil pump spindles, proposing an experiment to test a carbon steel gear against a nickel steel gear. | 28th Jan 1938 | Box 149 \ 2 scan0173 | |
| High-pitched squeal from the large capacity oil pump on Bentley Chassis after starting from cold. | 7th Feb 1938 | Box 149 \ 2 scan0174 | |
| High-pitched squeal from the large capacity oil pump when starting from cold. | 15th Feb 1938 | Box 149 \ 2 scan0175 | |
| Excessive wear in oil pump gears due to lack of lubrication and proposed solutions. | 27th Jan 1938 | Box 149 \ 2 scan0176 | |
| Scrapping and potential reclamation of E.53658 type oil pumps. | 27th Jan 1938 | Box 149 \ 2 scan0177 | |
| Excessive wear on oil pump gears, sending removed examples for inspection. | 8th Mar 1938 | Box 149 \ 2 scan0178 | |
| The design of the oil pump, drive, filter, and sump for the Bentley 50 model. | 29th Mar 1938 | Box 149 \ 2 scan0179 | |
| Heat treatment and plating process for a fuel pump bush and spindle. | 5th Apr 1938 | Box 149 \ 2 scan0180 | |
| Modifications to the Phantom III oil pump, relief valves, and oil filter to suit revised steering gear. | 5th Apr 1938 | Box 149 \ 2 scan0181 | |
| Pipe support for a new starter motor and a request to check clearances. | 5th Apr 1938 | Box 149 \ 2 scan0182 | |
| The urgent dispatch of six Bentley II oil pumps to the Paris depot. | 15th Jun 1938 | Box 149 \ 2 scan0183 | |
| To halt work on the Bentley 5 oil pump relief valve and oil pipes due to a pending modification to the cross steering tube. | 13th Mar 1939 | Box 149 \ 2 scan0184 | |
| Parts changes for the Bentley V. Chassis oil pump, fittings, and relief valves. | 24th Mar 1939 | Box 149 \ 2 scan0185 | |
| Continuation memorandum detailing part replacements for an experiment in Sections 5200 and 5205. | 24th Mar 1939 | Box 149 \ 2 scan0186 | |
| 500-hour endurance test for a Wraith chassis oil pump with a Bakelite casing. | 31th Mar 1939 | Box 149 \ 2 scan0187 | |
| Analysis of wear on gear components and a conclusion on the viability of plastic oil pump casings. | 31th Mar 1939 | Box 149 \ 2 scan0188 | |
| Wear measurements recorded during endurance tests for a Wraith Bakelite oil pump cover. | 24th Mar 1939 | Box 149 \ 2 scan0189 | |
| Wear measurements recorded during endurance tests for a Wraith Bakelite Oil Pump. | 21th Mar 1939 | Box 149 \ 2 scan0190 | |
| Wear measurements of a Wraith Bakelite Oil Pump casing, bush, and spindle during endurance tests. | 24th Mar 1939 | Box 149 \ 2 scan0191 | |
| Blueprint diagram illustrating cracks found within the casing of a Wraith Bakelite oil pump. | 21th Mar 1939 | Box 149 \ 2 scan0192 | |
| Performance graph for a Wraith pump with a bakelite casing, comparing delivery and depression before and after a 500-hour endurance test. | 24th Mar 1939 | Box 149 \ 2 scan0193 | |
| Test report on the 50-hour endurance run of a 'Tufnol' gear for a Wraith oil pump. | 14th Apr 1939 | Box 149 \ 2 scan0194 | |
| Results of a 100-hour endurance test on a gear, noting wear, overheating, and performance. | 14th Apr 1939 | Box 149 \ 2 scan0195 | |
| Graph plotting the results of 50-hour and 100-hour endurance tests on a Wraith oil pump with a Tufnol driven gear. | 14th Apr 1939 | Box 149 \ 2 scan0196 | |
| Tests carried out on an oil pump casing and cover machined from a solid block of Bakelite. | 14th Apr 1939 | Box 149 \ 2 scan0197 | |
| Tests conducted on a moulded Bakelite oil pump casing. | 12th Apr 1939 | Box 149 \ 2 scan0198 | |
| Inspection reports on a pump following 2-hour and 50-hour endurance tests. | 12th Apr 1939 | Box 149 \ 2 scan0199 | |
| Results of a pump endurance test after 100 and 500 hours. | 24th Mar 1939 | Box 149 \ 2 scan0200 | |
| Performance graph of a Wraith Oil Pump with a Bakelite casing, showing delivery and suction depression before and after a 652-hour test. | 24th Mar 1939 | Box 149 \ 2 scan0201 | |
| Blueprint showing cracks that developed on a Wraith Bakelite oil pump casing after use. | 12th Apr 1939 | Box 149 \ 2 scan0202 | |
| Test report detailing the wear, distortion, and performance of various components including a Bakelite case, bushes, and gears, and concluding on the viability of plastic oil pump casings. | 12th Apr 1939 | Box 149 \ 2 scan0203 | |
| Blueprint and data table showing wear measured during endurance tests on a 'Wraith' Bakelite oil pump cover. | 12th Apr 1939 | Box 149 \ 2 scan0204 | |
| Wear measurements for a Wraith Bakelite oil pump's driving and driven gears during endurance tests. | 12th Apr 1939 | Box 149 \ 2 scan0205 | |
| Diagram and tables showing wear test results on a Bakelite oil pump's casing, spindle, and bush. | 12th Apr 1939 | Box 149 \ 2 scan0206 | |
| Cost analysis and inspection report for parts EW.969 and EW.970, detailing factory costs and findings of cracks in a casing. | 12th Apr 1939 | Box 149 \ 2 scan0207 | |
| Analysis of casing cracks, comparing moulded versus machined production with a cost-benefit breakdown and recommendation. | 5th Apr 1939 | Box 149 \ 2 scan0208 | |
| Blueprint showing a cross-sectional view (Section B.C.) of a mechanical component. | 5th Apr 1939 | Box 149 \ 2 scan0209 | |
| Blueprint showing a cross-sectional view of a mechanical component, labeled as Figure V. | 5th Sep 1939 | Box 149 \ 2 scan0210 | |
| Blueprint showing a cross-section view (Fig. VI, Section A.C.) of a mechanical component. | 5th Apr 1939 | Box 149 \ 2 scan0211 | |
| Exploded-view photograph of a gear pump, showing the housing, cover, gasket, and helical gears. | 25th Apr 1941 | Box 149 \ 2 scan0212 | |
| Telegram received by telephone regarding the transport of an oil pump by train. | 25th Apr 1941 | Box 149 \ 2 scan0213 | |
| Telegram about sending an oil pump by passenger train and arranging transport. | 25th Apr 1941 | Box 149 \ 2 scan0214 | |
| Delivery performance of different Merlin engine oil pumps. | 28th Apr 1941 | Box 149 \ 2 scan0215 | |
| Graph of delivery curves for Merlin engine oil pumps. | 29th Apr 1941 | Box 149 \ 2 scan0216 | |
| Comparison of the Leyland Meteor and Merlin III oil pumps, detailing speed and length of pressure/scavenge gears. | 29th Apr 1941 | Box 149 \ 2 scan0217 | |
| Performance analysis of B.60 and B.80 oil pumps, with a comparative graph of delivery rates for different helical gear angles. | 13th May 1941 | Box 149 \ 2 scan0218 | |
| Reducing gear end clearance to prevent oil pressure drops, including a diagram showing potential wear points. | 13th May 1941 | Box 149 \ 2 scan0219 | |
| Letter declining interest in an oil pump gear from Electronic Engineering Services Ltd. | 17th Jul 1941 | Box 149 \ 2 scan0220 | |
| Proposal from Electronic Engineering Services, Ltd. for an oil pump gear made from iron powder. | 27th Jun 1941 | Box 149 \ 2 scan0221 | |
| Forwarding particulars and drawings concerning oil pumps and Davis Gears. | 21th Aug 1941 | Box 149 \ 2 scan0222 | |
| Article by Chrysler Corp. engineers on the factors influencing tank mileage and engine efficiency. | 1st Jan 1939 | Box 149 \ 3 scan0001 | |
| Analysis of vehicle fuel economy and performance, detailing the effects of speed, load, and wind resistance with supporting graphs. | 1st Jan 1939 | Box 149 \ 3 scan0002 | |
| Study on tank mileage, examining the impact of wind resistance, streamlining, gear reduction, and chassis friction on fuel economy. | 1st Jan 1939 | Box 149 \ 3 scan0003 | |
| Technical analysis of vehicle fuel economy in relation to gear ratios, engine speed, and vehicle weight, illustrated with graphs. | 1st Jan 1939 | Box 149 \ 3 scan0004 | |
| Page discussing vehicle tank mileage, analyzing the effects of weight, temperature, and trip length on fuel economy. | 1st Jan 1939 | Box 149 \ 3 scan0005 | |
| Page from a journal discussing vehicle fuel economy, comparing road-load economy to trip economy, and the effects of driver behaviour. | 5th Jan 1939 | Box 149 \ 3 scan0006 | |
| Letter to S.U. Co. Ltd. regarding petrol pump coil resistance and urging delivery of high-pressure pumps. | 5th Jan 1939 | Box 149 \ 3 scan0007 | |
| The modification of HP Petrol Pumps to make them interchangeable on Phantom III and Wraith models. | 7th Jan 1939 | Box 149 \ 3 scan0008 | |
| Request to order two different sizes of Bundy tubing for experimental purposes. | 20th Jan 1939 | Box 149 \ 3 scan0009 | |
| Letter to S.U. Company Ltd. detailing requested alterations for a high pressure petrol pump. | 21th Jan 1939 | Box 149 \ 3 scan0010 | |
| Urgent internal order request for 6 High Pressure petrol pumps from the S.U. Co. | 21th Jan 1939 | Box 149 \ 3 scan0011 | |
| Letter to H.M. Hobson Components Ltd. regarding the failure of a K.S. electrical petrol pump during an endurance test. | 21th Jan 1939 | Box 149 \ 3 scan0012 | |
| Requesting an official order to the S.U. Company for three high pressure pumps with cast iron bodies. | 24th Jan 1939 | Box 149 \ 3 scan0013 | |
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