| Description | Date | Identifier | |
| Phantom III valve gear tappet clearance figures under various operating temperatures. | 1st Feb 1936 | Box 96 \ 2 scan0130 | |
| Endurance test report on Bentley unit exhaust valves with and without chromium plating. | 1st Sep 1936 | Box 96 \ 2 scan0131 | |
| Technical note on experiments with valve and tappet clearances, noise, and wear on Phantom and Bentley units. | 1st Sep 1936 | Box 96 \ 2 scan0132 | |
| Bottom tappet misalignment with the camshaft causing cross-bedding and tightness in the guide. | 1st Sep 1936 | Box 96 \ 2 scan0133 | |
| List of temperature-related clearance and expansion settings for a Bentley 25/30 model. | 4th Sep 1936 | Box 96 \ 2 scan0134 | |
| Stresses of tapered valve springs on the 'Phantom III' and recommending a switch to parallel springs for improved safety. | 4th Sep 1936 | Box 96 \ 2 scan0135 | |
| History and experimental use of hydraulic tappets on the Phantom III engine. | 9th Sep 1936 | Box 96 \ 2 scan0136 | |
| Modifications to address tappet grooving, camshaft scoring, and alignment issues. | 17th Sep 1936 | Box 96 \ 2 scan0137 | |
| Design and failure of Phantom III valve springs, with handwritten queries. | 17th Sep 1936 | Box 96 \ 2 scan0138 | |
| Carbon steel spring failures, comparing American and English methods, and detailing stress figures for modified Phantom III valve springs. | 10th Sep 1936 | Box 96 \ 2 scan0139 | |
| History of valve spring changes and development for the Phantom III engine. | 10th Sep 1936 | Box 96 \ 2 scan0140 | |
| Page discussing cam form curves, spring load, and hydraulically controlled tappets. | 17th Sep 1936 | Box 96 \ 2 scan0141 | |
| Modifications to the Phantom III engine valve gear to reduce overoiling. | 17th Sep 1936 | Box 96 \ 2 scan0142 | |
| Failure of chrome vanadium valve springs, especially under extreme cold conditions. | 17th Sep 1936 | Box 96 \ 2 scan0143 | |
| The quality and testing of American hard-drawn wire compared to domestic supply. | 17th Sep 1936 | Box 96 \ 2 scan0144 | |
| Proposal to modify the Phantom III Relief Valve due to manufacturing difficulties. | 17th Sep 1936 | Box 96 \ 2 scan0145 | |
| Agreeing to modification LeC.5275 and discussing issues with push-in versus screw-in valve inserts. | 21th Sep 1936 | Box 96 \ 2 scan0146 | |
| Plans for research into valve gear and valve springs for various engines, beginning with the Phantom III. | 1st Oct 1936 | Box 96 \ 2 scan0147 | |
| Sheet 2 of a document discussing disconnecting a crank and ensuring oil supply. | 3rd Oct 1936 | Box 96 \ 2 scan0148 | |
| Confirming arrangements for valve gear research on a Ph.III engine unit. | 3rd Oct 1936 | Box 96 \ 2 scan0149 | |
| Valve gear rig tests to trial the use of plain carbon wire due to the cost of valve spring wire. | 1st Oct 1936 | Box 96 \ 2 scan0150 | |
| Five required modifications and trials for the Phantom III. | 6th Oct 1936 | Box 96 \ 2 scan0151 | |
| Request to fit valve springs to a Ph.III No.6 engine and produce cheaper trial springs for a Bentley. | 7th Oct 1936 | Box 96 \ 2 scan0152 | |
| Experimental modification to the Phantom III Rocker Mechanism to test low-stress valve springs. | 10th Oct 1936 | Box 96 \ 2 scan0153 | |
| Changing the material for low-stress valve springs on the Phantom III from chrome-vanadium to carbon steel wire. | 10th Oct 1936 | Box 96 \ 2 scan0154 | |
| Request to manufacture 12 Oil Restricting Plugs for rockers for the Phantom III. | 19th Oct 1936 | Box 96 \ 2 scan0155 | |
| Micro-examination report on Phantom lll valve springs made from Brunton's high carbon steel wire. | 20th Oct 1936 | Box 96 \ 2 scan0156 | |
| Valve spring design, materials, and potential suppliers in comparison with American practice. | 23th Oct 1936 | Box 96 \ 2 scan0157 | |
| Report discussing two types of springs, their manufacturing methods, and seeking further information from America. | 23th Sep 1936 | Box 96 \ 2 scan0158 | |
| Valve spring fatigue failure, surface decarburization, and the quality of Swedish wire, including a table of stress ranges. | 23th Sep 1936 | Box 96 \ 2 scan0159 | |
| Letter discussing coil heat treatment, stress figures, and a potential design collaboration. | 19th Oct 1936 | Box 96 \ 2 scan0160 | |
| Letter from the Royal Vice-Consulate for Sweden identifying UK firms who supply oil tempered wire. | 19th Oct 1936 | Box 96 \ 2 scan0161 | |
| Modifications to the Phantom III valve gear, comparing two schemes for locating tappet guides. | 14th Oct 1936 | Box 96 \ 2 scan0162 | |
| Scheme for low-stress valve springs for the Phantom III chassis, specifically a new lighter outer spring. | 28th Oct 1936 | Box 96 \ 2 scan0163 | |
| Alternative single valve spring scheme for the Phantom III chassis. | 30th Oct 1936 | Box 96 \ 2 scan0164 | |
| Issues found during testing a new Phantom III unit, specifically regarding thicker grommets causing potential damage. | 2nd Nov 1936 | Box 96 \ 2 scan0165 | |
| Serious issue with the Phantom III valve gear, requesting a meeting in Derby. | 12th Nov 1936 | Box 96 \ 2 scan0166 | |
| Directive to alter exhaust valve specifications for various car and engine units due to failures. | 12th Nov 1936 | Box 96 \ 2 scan0167 | |
| Requesting to send tappet push rods, adjusting screws for a P-III, and a set of plugs for a Bentley. | 12th Nov 1936 | Box 96 \ 2 scan0168 | |
| Previous failures and a new proposal for testing Phantom III roller tappets, including a material change recommendation. | 13th Nov 1936 | Box 96 \ 2 scan0169 | |
| Cost analysis and manufacturing suggestion for 25/30HP and Bentley valve rockers. | 16th Nov 1936 | Box 96 \ 2 scan0170 | |
| Modifications to the Phantom III valve rockers concerning wear and oil supply. | 20th Nov 1936 | Box 96 \ 2 scan0171 | |
| Replacement of double valve springs with a single spring on the Phantom III valve gear. | 27th Nov 1936 | Box 96 \ 2 scan0172 | |
| Request to have six bushes made from an attached drawing to address a Phantom III valve issue. | 1st Dec 1936 | Box 96 \ 2 scan0173 | |
| Request to manufacture two sets of sodium-filled exhaust valves for a Phantom III engine. | 4th Dec 1936 | Box 96 \ 2 scan0174 | |
| Phantom III short duration camshaft for running with large tappet clearances. | 4th Dec 1936 | Box 96 \ 2 scan0175 | |
| Test results for Phantom III tappets, recommending new fittings and weaker springs. | 9th Dec 1936 | Box 96 \ 2 scan0176 | |
| Tests comparing different types of bottom tappets for the Phantom III engine. | 9th Dec 1936 | Box 96 \ 2 scan0177 | |
| Tappet and camshaft wear after endurance testing, with proposals for future tests and hardness comparisons. | 9th Dec 1936 | Box 96 \ 2 scan0178 | |
| Investigation into valve mechanism trouble and misfiring on a PIII model during a cold start. | 9th Dec 1936 | Box 96 \ 2 scan0179 | |
| Analysis of valve sticking due to oil starvation in bearings and the design of a new bush to resolve the issue. | 9th Dec 1936 | Box 96 \ 2 scan0180 | |
| Experiment comparing standard and RM26 bushes, noting their effect on valve closure and suggesting a conclusive test on a PIII car. | 1st Dec 1926 | Box 96 \ 2 scan0181 | |
| Blueprint of a rocker pillar bush with dimensions and material specifications. | 1st Dec 1926 | Box 96 \ 2 scan0182 | |
| Hand-drawn diagram illustrating a rig setup for conducting valve tests. | 11th Dec 1936 | Box 96 \ 2 scan0183 | |
| Investigation into cold starting trouble and engine misfiring related to PIII valves and fittings. | 11th Dec 1936 | Box 96 \ 2 scan0184 | |
| Test observing the wrapping effect on bearing faces when a new, slightly oval rocker and eccentric are fitted. | 11th Dec 1936 | Box 96 \ 2 scan0185 | |
| Lubrication of rocker adjusting screws for the Phantom III engine. | 11th Dec 1936 | Box 96 \ 2 scan0186 | |
| Experimental trial of new lower stress valve springs for the Phantom III engine. | 11th Dec 1936 | Box 96 \ 2 scan0187 | |
| Modification notice for the Phantom III valve gear, concerning valve guides, washers, and springs. | 17th Dec 1936 | Box 96 \ 2 scan0188 | |
| Testing various bushes to resolve sticking issues with Phantom III valves and fittings during cold starting. | 14th Dec 1936 | Box 96 \ 2 scan0189 | |
| Blueprint for a bush for PIII rockers. | 14th Dec 1936 | Box 96 \ 2 scan0190 | |
| Blueprint for a Bush for PII Rockers. | 14th Dec 1936 | Box 96 \ 2 scan0191 | |
| Design blueprint for a Bush for PIII Rockers. | 17th Dec 1936 | Box 96 \ 2 scan0192 | |
| Request to manufacture a set of chill cast, cast iron bottom tappets for a Phantom III engine. | 17th Dec 1936 | Box 96 \ 2 scan0193 | |
| Modifications to the Phantom III rockers, specifically the deletion of hydraulic operation. | 22th Dec 1936 | Box 96 \ 2 scan0194 | |
| Simplification scheme for the oil pipes and relief valve for the Phantom III ordinary rockers. | 24th Dec 1936 | Box 96 \ 2 scan0195 | |
| Tests on alternative valve spring materials and designs for Bentley and Phantom III engines to reduce cost. | 24th Dec 1936 | Box 96 \ 2 scan0196 | |
| Analysis comparing the cost and performance of different valve springs, proposing a new universal spring made from Swedish wire. | 24th Dec 1936 | Box 96 \ 2 scan0197 | |
| Technical drawing detailing the specifications and dimensions for a valve spring with variable coil spacing. | 5th Jan 1936 | Box 96 \ 2 scan0198 | |
| Report from France regarding Phantom III engine trouble with hydraulic tappets and valve clearances. | 5th Jan 1936 | Box 96 \ 2 scan0199 | |
| Examination of a noisy and burst tappet on chassis 54-EX, attributing the issue to lubrication failure and proposing solutions. | 9th Jan 1937 | Box 96 \ 2 scan0200 | |
| Modifications to the valve gear lubrication system for the Phantom III engine. | 11th Jan 1937 | Box 96 \ 2 scan0201 | |
| Recommending modifications to the Phantom III valve gear to address known issues. | 11th Jan 1937 | Box 96 \ 2 scan0202 | |
| Modifications to the Phantom III Valve Gear regarding over-oiling and oil consumption. | 12th Jan 1937 | Box 96 \ 2 scan0203 | |
| Controversial costs and a simpler scheme for the Phantom III Valve Gear. | 20th Jan 1937 | Box 96 \ 2 scan0204 | |
| Investigations into over-oiling problems with the Phantom III Valve Gear and proposing a new design for valve wedges. | 12th Jan 1937 | Box 96 \ 2 scan0205 | |
| Short note regarding very small supplies of oil on 24 rocker levers. | 22th Jan 1937 | Box 96 \ 2 scan0206 | |
| Modifications for the Phantom valve gear lubrication system to reduce wear and overoiling. | 22th Jan 1937 | Box 96 \ 2 scan0207 | |
| Issues with Phantom III hydraulic tappets and proposing changes to clearance tolerances. | 22th Jan 1937 | Box 96 \ 2 scan0208 | |
| Replying to a suggestion about deleting the cup in a valve spring top washer and discussing a new scheme. | 23th Feb 1937 | Box 96 \ 2 scan0209 | |
| Investigation into misfiring on a Phantom III caused by a partly unscrewed exhaust valve insert. | 24th Feb 1937 | Box 96 \ 2 scan0210 | |
| Further design for Phantom III Valve Spring Wedges to prevent oil running down the valve stem. | 27th Jan 1937 | Box 96 \ 2 scan0211 | |
| Sticking exhaust valve in a 35-EX Phantom III, including valve clearance loss measurements. | 1st Mar 1937 | Box 96 \ 2 scan0212 | |
| Description of work carried out on a Phantom III chassis to address top overoiling issues. | 9th Mar 1937 | Box 96 \ 2 scan0213 | |
| Drain pipe modifications and fuel consumption results for chassis 3-AZ-170. | 9th Mar 1937 | Box 96 \ 2 scan0214 | |
| Recommending the use of felt pellets over new valve wedges based on rig testing results. | 24th Mar 1937 | Box 96 \ 2 scan0215 | |
| Standardisation of parts for the Phantom III, concerning the clearance between inlet valves and guides. | 25th Mar 1937 | Box 96 \ 2 scan0216 | |
| The standardization of tappet valves and guides for production on the 'C' Series chassis. | 26th May 1938 | Box 96 \ 2 scan0217 | |
| New design for Phantom III valve rockers, noting a known fault with excessive oil flow. | 16th Apr 1937 | Box 96 \ 2 scan0218 | |
| Test report on the wear of bottom tappets for a Phantom III Unit No.8 after a one-hour endurance test. | 19th Apr 1937 | Box 96 \ 2 scan0219 | |
| Cost-saving modification to the tappet block and clamp for the Phantom III. | 22th Apr 1937 | Box 96 \ 2 scan0220 | |
| Modifications and testing of a tappet block and clamp for a camshaft. | 24th Apr 1937 | Box 96 \ 2 scan0221 | |
| Test report on Phantom III valve gear, comparing a small base circle camshaft with different tappet materials. | 26th Apr 1937 | Box 96 \ 2 scan0222 | |
| Over-oiling issue on the Phantom III model and recommending a course of action regarding close clearance valves. | 30th Apr 1937 | Box 96 \ 2 scan0223 | |
| Standardisation of parts for the Phantom III, specifically the housing of a non-return ball valve and seat. | 3rd May 1937 | Box 96 \ 2 scan0224 | |
| Cost estimation for new tooling for a standardized non-return and relief valve housing on the Phantom III. | 19th Mar 1937 | Box 96 \ 2 scan0225 | |
| Check of the valves and valve gear on a specific car. | 3rd May 1937 | Box 96 \ 2 scan0226 | |
| Requesting the fitment of standard Phantom III double valve springs to a test unit. | 5th May 1937 | Box 96 \ 2 scan0227 | |
| Suggestion to restrict flow through the Phantom III valve gear filter using an orifice. | 21th May 1937 | Box 96 \ 2 scan0228 | |
| Requesting altered E.85506 valve guides for the Phantom II valve gear to reduce noise. | 27th May 1937 | Box 96 \ 2 scan0229 | |
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