| Description | Date | Identifier | |
| Modifications to oil pumps for Phantom and 20/25HP models to reduce noise. | 14th Jan 1931 | Box 149 \ 2 scan0036 | |
| Introduction and standardisation of oil pumps following a recent investigation. | 28th Jan 1931 | Box 149 \ 2 scan0037 | |
| Cure for noisy oil pumps by fitting a small chamber to the suction side. | 28th Jan 1931 | Box 149 \ 2 scan0038 | |
| Asking if a cure for noisy oil pumps on Phantom II models can be applied to Phantom I models. | 10th Feb 1931 | Box 149 \ 2 scan0039 | |
| Material change for noisy oil pump gear wheels from nickel to mild steel. | 11th Feb 1931 | Box 149 \ 2 scan0040 | |
| Inquiry regarding the maximum pressure capabilities of a gear pump for gearbox oil. | 2nd Jul 1931 | Box 149 \ 2 scan0041 | |
| Return of a loaned rotary pump to Messrs. Stothert & Pitt Ltd. | 19th Nov 1931 | Box 149 \ 2 scan0042 | |
| Letter to Messrs. Stothert & Pitt Ltd. detailing test results and criticism of Pump No. 4163. | 19th Nov 1931 | Box 149 \ 2 scan0043 | |
| Test report for a Stothert & Pitt Bump No. 4163, detailing performance at various speeds. | 26th Jun 1931 | Box 149 \ 2 scan0044 | |
| Performance graph for the Feuerheerd - Stothert and Pitt Pump No 4163, plotting delivery against pump speed. | 24th Nov 1931 | Box 149 \ 2 scan0045 | |
| Letter from Stothert & Pitt Ltd. concerning tests on pump No. 4163. | 24th Nov 1931 | Box 149 \ 2 scan0046 | |
| Standardisation of a reservoir for oil pumps to resolve noisy operation. | 29th Jan 1931 | Box 149 \ 2 scan0047 | |
| Form for the standardisation of chassis parts. | 15th Jan 1928 | Box 149 \ 2 scan0048 | |
| Proposal to change the material for pump gear wheels from nickel to mild steel to resolve noise issues. | 11th Feb 1931 | Box 149 \ 2 scan0049 | |
| Standardisation of a reservoir for oil pumps to cure noise. | 29th Jan 1931 | Box 149 \ 2 scan0050 | |
| Implementation of a new part on a chassis. | 30th Nov 1931 | Box 149 \ 2 scan0051 | |
| Design progress of an oil pump and distributor drive, including the ignition gear and lubrication system. | 7th Mar 1931 | Box 149 \ 2 scan0052 | |
| Development, testing, and cost reduction for the Japan 3 oil pump and distributor drive relief valve. | 11th Mar 1931 | Box 149 \ 2 scan0053 | |
| J.3 cross drive for the oil pump and distributor. | 9th Sep 1931 | Box 149 \ 2 scan0054 | |
| The J.3. oil pump, distributor drive, and oil relief unit. | 12th Sep 1931 | Box 149 \ 2 scan0055 | |
| Remodelled Malcolm-Feuerheerd pump, now adopted by Lagonda, and a potential meeting with Mr. Feuerheerd. | 24th Dec 1931 | Box 149 \ 2 scan0056 | |
| Stating a decision to cease interest in the Feuerheerd Pump after testing. | 30th Dec 1931 | Box 149 \ 2 scan0057 | |
| Confirming a lack of interest in the Feuerheerd Pump following a previous communication. | 31th Dec 1931 | Box 149 \ 2 scan0058 | |
| Proposing modifications to manage oil overflow in the Peregrine engine. | 19th Jul 1932 | Box 149 \ 2 scan0059 | |
| Modification of the Peregrine oil pump gears. | 16th Feb 1933 | Box 149 \ 2 scan0060 | |
| Testing of a new oil pump for Phantom Kelmit bearings. | 16th May 1933 | Box 149 \ 2 scan0061 | |
| Request to convert an oil pump to a larger capacity unit by fitting a list of modified parts. | 16th May 1933 | Box 149 \ 2 scan0062 | |
| Noisy 20/25 HP Chassis oil pumps and the effectiveness of machining a pressure release slot. | 26th May 1933 | Box 149 \ 2 scan0063 | |
| The development and endurance testing of a helical gear oil pump for the Phantom model. | 2nd Jun 1933 | Box 149 \ 2 scan0064 | |
| Gear testing, detailing end clearance after 100 hours, gear noise, and alterations to oil pumps on various models. | 1st Jun 1933 | Box 149 \ 2 scan0065 | |
| Recurring issues with noisy oil pumps on cars and potential solutions. | 14th Jun 1933 | Box 149 \ 2 scan0066 | |
| Technical memo on the investigation and endurance testing of a helical gear oil pump. | 1st Jun 1933 | Box 149 \ 2 scan0067 | |
| The end clearance and noise levels of a driven gear after a 100-hour endurance test. | 2nd Jun 1933 | Box 149 \ 2 scan0068 | |
| Request to produce a larger oil pump for the 20/25 model for use with Kelmit bearings. | 17th Jul 1933 | Box 149 \ 2 scan0069 | |
| Testing of various chassis engine oil pumps, focusing on noise and different designs. | 28th Jul 1933 | Box 149 \ 2 scan0070 | |
| Cover note for a delivery curve of a helical gear pump against the standard article. | 8th Aug 1933 | Box 149 \ 2 scan0071 | |
| Performance comparison graph between standard spur gear and helical gear oil pumps. | 3rd Aug 1933 | Box 149 \ 2 scan0072 | |
| Testing of a 'Savery' oil pump against a standard gear pump for noise and performance. | 4th Sep 1933 | Box 149 \ 2 scan0073 | |
| Endurance and performance test report for the Savery and Condor petrol pumps. | 22th Aug 1933 | Box 149 \ 2 scan0074 | |
| Performance graph for a 'Savery' Petrol Pump, plotting delivery rate against pump speed. | 22th Aug 1933 | Box 149 \ 2 scan0075 | |
| Blueprint of the operating mechanism for a 'Savery' petrol pump. | 31th Aug 1933 | Box 149 \ 2 scan0076 | |
| Arrangement of casings for a 'Savery' petrol pump. | 31th Aug 1933 | Box 149 \ 2 scan0077 | |
| Comparison of a Bentley oil pump with helical gears against the standard pump with straight-cut spur gears. | 5th Sep 1933 | Box 149 \ 2 scan0078 | |
| The road and rig tests of a helical gear pump. | 5th Sep 1933 | Box 149 \ 2 scan0079 | |
| Performance comparison graph between a standard spur gear and a helical gear Bensport oil pump. | 3rd Aug 1933 | Box 149 \ 2 scan0080 | |
| Blueprint diagram for a Bensport oil pump with helical gears. | 4th Sep 1933 | Box 149 \ 2 scan0081 | |
| Helical gear oil pumps for the Phantom II and 20/25 models. | 1st Jan 1934 | Box 149 \ 2 scan0082 | |
| The dispatch of helical gear oil pumps for Phantom II and 20/25 models. | 1st Jan 1934 | Box 149 \ 2 scan0083 | |
| Costing and design considerations for a 'Savery' Oil Pump compared to the standard Phantom II pump. | 6th Jan 1934 | Box 149 \ 2 scan0084 | |
| Design change for 25-HP and Bentley Oil Pump casings from bronze to aluminium. | 24th Mar 1934 | Box 149 \ 2 scan0085 | |
| Report comparing the efficiency and design of Luvax-Bijur and R.R. manufactured oil pumps for Bentley chassis. | 28th Mar 1934 | Box 149 \ 2 scan0086 | |
| Request to produce a lighter oil pump with helical gears for the 10,000 miles car. | 5th Jun 1934 | Box 149 \ 2 scan0087 | |
| Experimental vertical baffle design to resolve oil pressure loss in the Spectre oil sump. | 16th Nov 1934 | Box 149 \ 2 scan0088 | |
| Oil pressure issues and pump performance on the Spectre engine. | 11th Dec 1934 | Box 149 \ 2 scan0089 | |
| Analysis of oil pump drive and relief valve passages with a proposal to increase oil flow capacity. | 11th Dec 1934 | Box 149 \ 2 scan0090 | |
| Urgent internal memo discussing the specifications and use of a new large oil pump for a Bentley. | 4th Jan 1935 | Box 149 \ 2 scan0091 | |
| Specification for the propellor shaft damper slip load on 20/25 and Bentley chassis. | 16th Jan 1935 | Box 149 \ 2 scan0092 | |
| Tests of the Bentley Increased Capacity Helical Oil Pump with spiral gears. | 28th Jan 1935 | Box 149 \ 2 scan0093 | |
| Performance comparison graph for Bentley oil pumps, plotting delivery rate against pump speed. | 18th Jan 1935 | Box 149 \ 2 scan0094 | |
| Test results for increased capacity helical gears in Bentley oil pumps. | 18th Jan 1935 | Box 149 \ 2 scan0095 | |
| The limitation of delivery in Bentley Oil Pumps due to inlet pipe restrictions with increased capacity pumps. | 26th Jan 1935 | Box 149 \ 2 scan0096 | |
| Graph comparing the delivery performance of a Standard Spur Gear Pump against a Helical Gear Pump for Bentley oil pumps. | 23th Jan 1935 | Box 149 \ 2 scan0097 | |
| The fitting and initial testing of various increased capacity oil pumps. | 28th Feb 1935 | Box 149 \ 2 scan0098 | |
| Testing and standardisation of an increased capacity oil pump with helical gears. | 22th Feb 1935 | Box 149 \ 2 scan0099 | |
| Modifications for a Large Spectre Oil Pump and referencing a Smaller Water Pump. | 9th Mar 1935 | Box 149 \ 2 scan0100 | |
| Standardisation of parts for an increased capacity oil pump. | 19th Jan 1935 | Box 149 \ 2 scan0101 | |
| Cost analysis for introducing a new part, detailing material, labour, charges, and extra tooling costs. | 28th Jan 1935 | Box 149 \ 2 scan0102 | |
| Investigation into helical gear oil pumps failing to prime, possibly due to insufficient back lash. | 15th Jul 1935 | Box 149 \ 2 scan0103 | |
| The delivery curves and performance tests for new Bentley oil pumps featuring helical gears for increased capacity. | 15th Jul 1935 | Box 149 \ 2 scan0104 | |
| Priming fault in newly standardised Helical Gear Oil Pumps for 20/25 & Bentley models. | 31th Jul 1935 | Box 149 \ 2 scan0105 | |
| Instruction to continue using the old type helical oil pump for the Bentley and 20/25 HP chassis due to priming issues. | 2nd Aug 1935 | Box 149 \ 2 scan0106 | |
| Priming issues with larger helical gear oil pumps fitted with lead bronze bearings. | 3rd Aug 1935 | Box 149 \ 2 scan0107 | |
| Priming tests for Bentley helical gear oil pumps, comparing performance with a 'roof' type filter versus a standard filter. | 16th Sep 1935 | Box 149 \ 2 scan0108 | |
| Priming tests for increased capacity helical gear oil pumps on Bentley engines. | 17th Aug 1935 | Box 149 \ 2 scan0109 | |
| Report analysing oil pump and filter design issues, specifically air trapping. | 17th Aug 1935 | Box 149 \ 2 scan0110 | |
| Illustrations of two types of filters, 'Bentley' and 'Silver Ghost', used during oil pump priming tests. | 17th Aug 1935 | Box 149 \ 2 scan0111 | |
| Restriction tests for the Bentley Gallery Oil Pipe assembly, arrangement EB-305. | 17th Sep 1935 | Box 149 \ 2 scan0112 | |
| Test results for Bentley Gallery Pipe restrictions using Motorine 'C' oil at 30°C. | 27th Aug 1935 | Box 149 \ 2 scan0113 | |
| Graph detailing Bentley gallery pipe restriction tests using 'Motorine C' oil at 30°C. | 27th Aug 1935 | Box 149 \ 2 scan0114 | |
| Graph showing the results of restriction tests on a Bentley Gallery Pipe using Motorine 'C' Oil at 30°. | 27th Aug 1935 | Box 149 \ 2 scan0115 | |
| Priming tests for a Bentley helical gear oil pump, noting the positive effect of a B.W.P. type filter. | 21th Sep 1935 | Box 149 \ 2 scan0116 | |
| The failure of Hall's metal bearings and the proposed switch to lead bronze bearings. | 11th Nov 1935 | Box 149 \ 2 scan0117 | |
| Low oil pressure issue on the Phantom III and comparing oil pump types. | 3rd May 1936 | Box 149 \ 2 scan0118 | |
| Request to detail and produce a modified oil pump for the Phantom III to address low oil pressure issues. | 5th Jun 1936 | Box 149 \ 2 scan0119 | |
| Additional parts for a special pump and relief valves being fitted to a B-15 Bentley unit. | 10th Jun 1936 | Box 149 \ 2 scan0120 | |
| Two failures of the Phantom III oil pump drive during cold start testing. | 10th Aug 1936 | Box 149 \ 2 scan0121 | |
| Proposal for the Phantom III oil pump driving shaft assembly, reducing costs and standardizing connections. | 17th Aug 1936 | Box 149 \ 2 scan0122 | |
| Multiple failures of the oil pump drive shaft assembly on the Phantom III, recommending immediate replacement of existing shafts. | 14th Sep 1936 | Box 149 \ 2 scan0123 | |
| The unreliability of the Phantom III oil pump driving shaft, proposing a replacement with an improved design across all produced chassis. | 16th Sep 1936 | Box 149 \ 2 scan0124 | |
| The supply schedule and potential production delays for Phantom III oil pump driving tubes. | 19th Sep 1936 | Box 149 \ 2 scan0125 | |
| Failure of drive shaft couplings and a proposed design change to use serrations. | 21th Sep 1936 | Box 149 \ 2 scan0126 | |
| Modifications to the Phantom III Oil Pump Driving Shaft Assembly, specifically concerning knurled press fit assemblies. | 23th Sep 1936 | Box 149 \ 2 scan0127 | |
| Use of knurled press fit assemblies for the Phantom III Oil Pump Driving Shaft. | 30th Sep 1936 | Box 149 \ 2 scan0128 | |
| The requirement to fit larger oil pumps to 4 1/4-litre Bentley cars in France. | 18th Dec 1936 | Box 149 \ 2 scan0129 | |
| Comparing the advantages and disadvantages of helical and straight gear oil pumps for Bentley chassis. | 24th Dec 1936 | Box 149 \ 2 scan0130 | |
| List of different oil pumps to be tested to resolve general gear noise. | 24th Dec 1936 | Box 149 \ 2 scan0131 | |
| Instruction to bring on a larger oil pump for the Bentley Chassis. | 29th Dec 1936 | Box 149 \ 2 scan0132 | |
| Trial of new oil pump gears with a 30° angle of obliquity. | 15th Jan 1937 | Box 149 \ 2 scan0133 | |
| Requesting the production of several oil pumps with 10° angle Helical gears for testing on experimental engines. | 13th Jan 1937 | Box 149 \ 2 scan0134 | |
| Oil pressure failure in Bentley oil pumps, testing various solutions, and providing recommendations. | 27th Jan 1937 | Box 149 \ 2 scan0135 | |
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