| Description | Date | Identifier | |
| The design and testing of a self-adjusting tappet mechanism for the Phantom II engine. | 14th Sep 1933 | Box 106 \ 5 scan0100 | |
| The investigation of noisy engine tappets and attempted remedies. | 14th Sep 1933 | Box 106 \ 5 scan0101 | |
| Comparison table of silent tappet systems for Cadillac, J.III, and Phantom II engines, considering only spring loads. | 14th Sep 1933 | Box 106 \ 5 scan0102 | |
| The work done to resolve issues with the silent tappet mechanism on engine 1.J.III. | 14th Sep 1933 | Box 106 \ 5 scan0103 | |
| Engine component modifications and test results, focusing on oil feed, plungers, and springs. | 12th Sep 1932 | Box 106 \ 5 scan0104 | |
| Troubleshooting issues with oil supply to the rocker shaft, plunger housing fitment, and tappet mechanism performance. | 12th Sep 1932 | Box 106 \ 5 scan0105 | |
| Trial of eccentrics for auto-adjusting tappets with a white metalled bearing surface. | 18th Sep 1933 | Box 106 \ 5 scan0106 | |
| Modifications required for a J.3 unit's hydraulically operated tappets. | 20th Sep 1933 | Box 106 \ 5 scan0107 | |
| The examination and identified issues with a silent tappet mechanism after 2000 miles of use. | 23th Sep 1933 | Box 106 \ 5 scan0108 | |
| List of required replacement parts and design requirements for an engine, including tappets, camshaft, bearings, and an oil filter. | 23th Sep 1933 | Box 106 \ 5 scan0109 | |
| Data table showing oil flow from the relief valve to the rocker shaft and timing gears at various engine speeds. | 23th Sep 1933 | Box 106 \ 5 scan0110 | |
| Addition to a report on tests comparing the valving efficiency of Phantom and Bentley engines. | 25th Sep 1933 | Box 106 \ 5 scan0111 | |
| Analysis of engine airflow, induction port design, and combustion chamber characteristics. | 25th Sep 1933 | Box 106 \ 5 scan0112 | |
| Summary of tests comparing single versus double inlet valve cylinder heads for improved volumetric efficiency. | 25th Sep 1933 | Box 106 \ 5 scan0113 | |
| Sectional elevation and plan view of a rotating port or valve mechanism within a cylinder head. | 28th Sep 1933 | Box 106 \ 5 scan0114 | |
| Astounding results of repeated oil flow tests on rocker shafts using larger diameter piping. | 28th Sep 1933 | Box 106 \ 5 scan0115 | |
| Test results for oil flow from the relief valve to the rocker shaft under various conditions. | 28th Sep 1933 | Box 106 \ 5 scan0116 | |
| Test results and proposed changes for J.3. oil-operated tappets, including pipe diameter and filter type. | 29th Sep 1933 | Box 106 \ 5 scan0117 | |
| Forwarding a letter from Mr. Jardine regarding hydraulic tappets from Wilcox Rich Corporation. | 30th Oct 1933 | Box 106 \ 5 scan0118 | |
| Letter to Robert Jardine Esq. regarding drawings for a hydraulic tappet installation. | 1st Nov 1933 | Box 106 \ 5 scan0119 | |
| Confirming a set of drawings for the 20/25 HP car tappet installation has been sent to Mr. Jardine of the Wilcox Rich Corporation. | 1st Nov 1933 | Box 106 \ 5 scan0120 | |
| Comparison table of silent tappet specifications for various car models. | 29th Nov 1933 | Box 106 \ 5 scan0121 | |
| Request for a set of plungers for J-III silent tappets with a revised clearance and reduced diameter. | 11th Jan 1934 | Box 106 \ 5 scan0122 | |
| Request to re-metal and bore out automatic tappet eccentrics and rocker shafts to a specific clearance. | 22th Mar 1934 | Box 106 \ 5 scan0123 | |
| Silent tappet scheme, rockers for the 20/25 and Bentley models, and a 10,000-mile test. | 19th Apr 1934 | Box 106 \ 5 scan0124 | |
| Request to modify Cadillac type silent tappet plunger casings and produce another complete set. | 16th May 1934 | Box 106 \ 5 scan0125 | |
| The modification of rocker shafts and tappets for Bentley and 25 HP engines. | 9th Jun 1934 | Box 106 \ 5 scan0126 | |
| Request to fit Halford silent tappets to a 20/25 car and to create a corresponding filter. | 11th Jul 1934 | Box 106 \ 5 scan0127 | |
| Mathematical analysis of the effect of leakage in hydraulic tappets. | 24th Jul 1934 | Box 106 \ 5 scan0128 | |
| Comparison of tappet leakage effects and relative movement across different engine models. | 24th Jul 1934 | Box 106 \ 5 scan0129 | |
| Outlining conclusions on car engine valve gear, including drilled valves, manufacture, and hydraulic tappet adjustment. | 27th Jul 1934 | Box 106 \ 5 scan0130 | |
| Valve gear options, including Halford tappets and Cadillac schemes, and the number of valves per cylinder for various engine types. | 27th Jul 1934 | Box 106 \ 5 scan0131 | |
| High power head inlet valve options and deflection within the valve mechanism. | 27th Jul 1934 | Box 106 \ 5 scan0132 | |
| The inconsistency of data and reliability of figures concerning engine valve bounce. | 18th Jul 1934 | Box 106 \ 5 scan0133 | |
| Comparison table of actual and theoretical valve bouncing speeds for various engines. | 18th Jul 1934 | Box 106 \ 5 scan0134 | |
| Report page discussing valve gear bouncing speeds, push rod flexure, and theoretical data for various car engines. | 18th Jul 1934 | Box 106 \ 5 scan0135 | |
| Valve bounce speeds, tappet springs, and different types of automatic hydraulic tappets. | 18th Jul 1934 | Box 106 \ 5 scan0136 | |
| Construction of a rig to magnify and photograph valve motion to understand valve bounce. | 18th Jul 1934 | Box 106 \ 5 scan0137 | |
| Request to arrange for a replacement for a broken hydraulic rocker for 21-G-IV. | 3rd Aug 1934 | Box 106 \ 5 scan0138 | |
| Comparing Halford and Cadillac silent tappet schemes following 10,000-mile tests and making design recommendations. | 6th Sep 1934 | Box 106 \ 5 scan0139 | |
| List of modifications and considerations for engine components like valves, camshafts, and tappets. | 6th Sep 1934 | Box 106 \ 5 scan0140 | |
| Recommendations for a re-design of the relief valve and an increase in the size of the oil pump. | 6th Sep 1934 | Box 106 \ 5 scan0141 | |
| Standardisation of parts scheme to prevent valves dropping in the cylinder head. | 29th May 1934 | Box 106 \ 5 scan0142 | |
| Estimated cost for extra jigs, tools, and equipment and a proposed production start. | 24th Jul 1934 | Box 106 \ 5 scan0143 | |
| Exhaust valve seat hammering on a 25 HP engine. | 22th Dec 1934 | Box 106 \ 5 scan0144 | |
| Issues with silichrome exhaust valves on 20/25 HP models due to leaded fuels, recommending a change to KE-965 valves. | 17th Sep 1935 | Box 106 \ 5 scan0145 | |
| Requesting the preparation of stellited and silichrome exhaust valves for the Spectre and 20/25 HP engines. | 23th Sep 1935 | Box 106 \ 5 scan0146 | |
| The standardisation of exhaust valves for the 20/25 HP chassis. | 25th Sep 1935 | Box 106 \ 5 scan0147 | |
| The decision to increase valve stem diameter on large bore engines for 25-29 HP and 4 litre Bentley models. | 27th Sep 1935 | Box 106 \ 5 scan0148 | |
| Standardisation of parts report for KE-965 exhaust valves following a valve head failure. | 24th Oct 1935 | Box 106 \ 5 scan0149 | |
| Cost estimation for extra Jigs, Tools, and equipment, and cost comparison for a new part for the 'M' series chassis. | 10th Oct 1935 | Box 106 \ 5 scan0150 | |
| Valve bounce issues and solutions for the Large Bore 25.HP engine. | 2nd Jan 1936 | Box 106 \ 5 scan0151 | |
| Urgent experimental request to detail new valve wedges for the 20-25 HP engine inlet valves. | 15th Jan 1936 | Box 106 \ 5 scan0152 | |
| Modifications to the rocker shaft and arm for the 25-30 and Bentley models. | 6th Feb 1936 | Box 106 \ 5 scan0153 | |
| Authorising a production modification to the Bentley & 20/25 valve gear following successful testing. | 9th Apr 1936 | Box 106 \ 5 scan0154 | |
| Experimental tapered exhaust valve (LeC.5088) for the 25/30 HP engine. | 22th Apr 1936 | Box 106 \ 5 scan0155 | |
| Comparative performance and potential failures of different exhaust valves. | 25th Apr 1936 | Box 106 \ 5 scan0156 | |
| Issues and potential improvements for the 20/25 model, focusing on the exhaust, valves, and cooling system. | 25th Apr 1936 | Box 106 \ 5 scan0157 | |
| Test results for a torsional crankshaft and valve stretching. | 25th Apr 1936 | Box 106 \ 5 scan0158 | |
| List of proposed valve tests for a 20/25 v. Bentley engine. | 29th Apr 1936 | Box 106 \ 5 scan0159 | |
| Corrections for a valve comparison sheet and comparing different exhaust valve designs. | 29th Apr 1936 | Box 106 \ 5 scan0160 | |
| Tappet clearance adjustment data for 22-G-V Engine C-16. | 30th Apr 1936 | Box 106 \ 5 scan0161 | |
| Recommendations for tappet clearances and sparking plugs for the Large Bore 20/25 HP engine. | 1st May 1936 | Box 106 \ 5 scan0162 | |
| The decision to standardize a new exhaust valve for 25/30 units. | 6th May 1936 | Box 106 \ 5 scan0163 | |
| Recurring exhaust valve failures on the 25/30 HP engine and recommending a cylinder head alteration. | 31th Jul 1936 | Box 106 \ 5 scan0164 | |
| Preliminary valve temperature tests for the 25/30 units, comparing them to the 4¼ litre Bentley. | 31th Jul 1936 | Box 106 \ 5 scan0165 | |
| Engine head modifications to resolve overheating and pre-ignition problems. | 31th Jul 1936 | Box 106 \ 5 scan0166 | |
| Blueprint of a scrap section through an exhaust port and cylinder head. | 31th Jul 1936 | Box 106 \ 5 scan0167 | |
| Scrap section view of a cylinder head's exhaust port and valve assembly. | 31th Jul 1936 | Box 106 \ 5 scan0168 | |
| Graph comparing exhaust valve temperatures against specific consumption for different engine setups and fuel types. | 31th Jul 1936 | Box 106 \ 5 scan0169 | |
| Blueprint showing a cross-section of an exhaust component. | 31th Jul 1936 | Box 106 \ 5 scan0170 | |
| Blueprint showing a cross-section of an exhaust section. | 19th Aug 1936 | Box 106 \ 5 scan0171 | |
| Standardisation of parts document for a 25/30 HP engine concerning the overhead adjustment of tappet push rods. | 19th Aug 1936 | Box 106 \ 5 scan0172 | |
| Estimated cost for jigs, tools, and equipment, with a note about the balance being included in Bentley. | 13th Jul 1936 | Box 106 \ 5 scan0173 | |
| Report comparing exhaust valve temperatures on a standard 25/30 cylinder head versus a modified head with a lowered water jacket. | 12th Nov 1936 | Box 106 \ 5 scan0174 | |
| Graph of exhaust valve temperatures versus specific fuel consumption for two different cylinder heads. | 3rd Nov 1938 | Box 106 \ 5 scan0175 | |
| Graph plotting specific fuel consumption against BMEP for a C.15 unit at 4000 RPM, comparing a standard cylinder head with an LEC 5222 head. | 5th Jan 1936 | Box 106 \ 5 scan0176 | |
| Power curves for a C15 Unit, comparing a standard cylinder head with a Cylinder Head LBC 5222. | 5th Nov 1936 | Box 106 \ 5 scan0177 | |
| Experiments to lower exhaust valve temperatures on a cylinder head. | 11th Dec 1936 | Box 106 \ 5 scan0178 | |
| The 5.B.A. location screw coming loose in the rocker shaft of Wraith, Bentley, and 30 HP models, recommending a spring washer. | 31th Dec 1937 | Box 106 \ 5 scan0179 | |
| Cracked roller from the Marles steering system on a Wraith chassis following a frontal crash. | 24th Aug 1939 | Box 106 \ 5 scan0180 | |
| Sample springs for the anti-rattle device on a Bentley Phantom III steering column. | 24th Nov 1938 | Box 106 \ 5 scan0181 | |
| Statistics of Bentley steering control rattle in different car series. | 26th Jan 1939 | Box 106 \ 5 scan0182 | |
| Internal memorandum regarding complaints about Bentley steering control rattles. | 19th Jan 1939 | Box 106 \ 5 scan0183 | |
| Fitting of an anti-rattle device to the steering columns of five Bentley cars. | 20th Dec 1938 | Box 106 \ 5 scan0184 | |
| Proposal for an anti-rattle device for the steering column of Bentley and Phantom III models, requesting the production of sample springs for testing. | 23th Nov 1938 | Box 106 \ 5 scan0185 | |
| Developed view drawing for a cylindrical component with cutouts and tabs. | 20th Oct 1938 | Box 106 \ 5 scan0186 | |
| Steering control rattle in a Bentley caused by collapsed felt in the control tube. | 20th Oct 1938 | Box 106 \ 5 scan0187 | |
| Letter to Bentley Motors requesting a blueprint for a modification to cross steering tubes to fix steering wobble. | 21th Sep 1938 | Box 106 \ 5 scan0188 | |
| Satirically formal letter to the editor of the 'Levallois Gazette' regarding a blueprint for a Kingsbury Patent Track Rod Constant Load Adjuster. | 22th Sep 1938 | Box 106 \ 5 scan0189 | |
| Steering wobble issues and a flat battery on C. Nichols' car. | 31th Aug 1938 | Box 106 \ 5 scan0190 | |
| Letter from a customer to the Sales Director's Office concerning a persistent wheel wobble and a battery issue on a 4 1/4-litre car. | 29th Aug 1938 | Box 106 \ 5 scan0191 | |
| Blueprint detailing a modification to a cross-steering tube end for more even load distribution. | 1st Jun 1938 | Box 106 \ 5 scan0192 | |
| Drawing for a modification to the Bentley Chassis steering system. | 8th Jun 1938 | Box 106 \ 5 scan0193 | |
| Complaint of a loose Bentley steering box, and the introduction of a new bolt to fix the issue. | 1st Dec 1937 | Box 106 \ 5 scan0194 | |
| Internal memorandum regarding complaints of loose steering on Bentley frames. | 29th Nov 1937 | Box 106 \ 5 scan0195 | |
| Request for a new scheme, detailed drawings, and a test for a Bentley steering column design to take up wear using a rubber ring and felt bearing. | 15th Dec 1937 | Box 106 \ 5 scan0196 | |
| Fix for a Bentley steering column rattle. | 14th Dec 1937 | Box 106 \ 5 scan0197 | |
| Feedback on the steering performance of a Frazer-Nash Bentley in high winds. | 18th Nov 1936 | Box 106 \ 5 scan0198 | |
| Customer complaints of stiff Bentley steering. | 30th Oct 1930 | Box 106 \ 5 scan0199 | |
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