| Description | Date | Identifier | |
| Experimental modification to valve spring RS.500 to increase its seat load. | 29th May 1937 | Box 96 \ 2 scan0230 | |
| Preliminary tests and proposed modifications for the Phantom III solid rockers and non-hydraulic valve gear. | 1st Jun 1937 | Box 96 \ 2 scan0231 | |
| Oil feed to rockers, valve operation, and associated noise issues, including tappet clearance and camshaft design. | 1st Jun 1937 | Box 96 \ 2 scan0232 | |
| Analysis of hydraulic systems versus solid rocker gear, comparing power, quietness and performance. | 1st Jun 1937 | Box 96 \ 2 scan0233 | |
| Camshaft timings, valve bounce, and cost estimations for different engine configurations. | 1st Jun 1937 | Box 96 \ 2 scan0234 | |
| Blueprint showing a cross-section for a modification to a rocker part. | 3rd Aug 1932 | Box 96 \ 2 scan0235 | |
| Blueprint detailing a modification to a Rocker Bush for a Phantom III. | 24th May 1937 | Box 96 \ 2 scan0236 | |
| Blueprint for a main pressure valve spring for use with a relief valve. | 27th May 1931 | Box 96 \ 2 scan0237 | |
| Blueprint detailing the specifications for a low pressure valve spring. | 27th Jun 1924 | Box 96 \ 2 scan0238 | |
| Performance comparison chart for the Phantom III engine under various configurations. | 2nd Jun 1937 | Box 96 \ 2 scan0239 | |
| Drawing of a Modified Rocker Shaft (Ph.III). | 2nd Jun 1937 | Box 96 \ 2 scan0240 | |
| Request for experimental modifications to Phantom III rocker shafts due to service failures. | 11th Jun 1937 | Box 96 \ 2 scan0241 | |
| The trial of nitrided exhaust valve stems for the Phantom III to reduce sticking and noise. | 25th Jun 1937 | Box 96 \ 2 scan0242 | |
| To hold-up work on the Phantom III chassis cylinder head and valve fittings. | 27th Jul 1937 | Box 96 \ 2 scan0243 | |
| Summary of parts involved in changing from auto-adjusting tappets to solid rockers on a Phantom III chassis. | 6th Aug 1937 | Box 96 \ 2 scan0244 | |
| Continued parts list for Section 5060, covering valves and fittings with their part numbers and status. | 6th Aug 1937 | Box 96 \ 2 scan0245 | |
| Parts list for valves, fittings, camshafts, and oil relief components with their status. | 6th Aug 1937 | Box 96 \ 2 scan0246 | |
| List of parts and queries for engine components including oil relief valves, filters, crankcases, and camshafts. | 6th Aug 1937 | Box 96 \ 2 scan0247 | |
| Query regarding alternative relief valve spring pressures tested for solid rockers. | 6th Aug 1937 | Box 96 \ 2 scan0248 | |
| Specification for the Phantom III solid rocker gear and associated components after a 15,000-mile test. | 7th Aug 1937 | Box 96 \ 2 scan0249 | |
| Decisions on modifications to the Phantom III valve gear. | 9th Aug 1937 | Box 96 \ 2 scan0250 | |
| Simplified design for Phantom III tappets without tappet springs. | 10th Aug 1937 | Box 96 \ 2 scan0251 | |
| The introduction of non-hydraulic tappets for the Phantom III 'D' Series chassis and the associated scrap costs. | 2nd Sep 1937 | Box 96 \ 2 scan0252 | |
| The parts and modifications required to fit solid rocker gear to cars 33-EX and 37-EX. | 11th Sep 1937 | Box 96 \ 2 scan0253 | |
| Production trial instructions and listing associated List of Operations (LOPs) for various engine components. | 11th Sep 1937 | Box 96 \ 2 scan0254 | |
| Issues and recommendations for the Phantom III valve gear. | 18th Sep 1937 | Box 96 \ 2 scan0255 | |
| Modifications and standardisation for the Phantom III valve gear. | 23th Sep 1937 | Box 96 \ 2 scan0256 | |
| Production modifications and standardisation for the Phantom III valve gear. | 23th Sep 1937 | Box 96 \ 2 scan0257 | |
| Modifications to the Phantom and Wraith valve gear for improved lubrication. | 1st Oct 1937 | Box 96 \ 2 scan0258 | |
| Modifications for Ph.III valve seat inserts to prevent them from coming loose. | 15th Oct 1937 | Box 96 \ 2 scan0259 | |
| Instructing to proceed with the trial of Ph.III valve seat inserts for the S/SLV model. | 20th Oct 1937 | Box 96 \ 2 scan0260 | |
| Issues and solutions for hydraulic tappets on the Phantom III. | 2nd Nov 1937 | Box 96 \ 2 scan0261 | |
| Endurance test report on Phantom III bottom tappet wear for unit no. 5. | 2nd Nov 1937 | Box 96 \ 2 scan0262 | |
| The condition of cast iron tappet blocks after endurance testing at various RPMs. | 2nd Nov 1937 | Box 96 \ 2 scan0263 | |
| The condition of tappets after endurance tests at 3500 and 4000 R.P.M. | 2nd Nov 1937 | Box 96 \ 2 scan0264 | |
| Endurance test report detailing the condition of engine tappets after running. | 2nd Nov 1937 | Box 96 \ 2 scan0265 | |
| Condition report on engine tappets after running tests. | 2nd Nov 1937 | Box 96 \ 2 scan0266 | |
| The condition of S/ZN, cloud burst hardened, and plated tappets after a high-speed test run. | 2nd Nov 1937 | Box 96 \ 2 scan0267 | |
| Summary of tests conducted on various types of bottom tappets. | 8th Nov 1937 | Box 96 \ 2 scan0268 | |
| Replacement of Rocker Shafts E.86887 with E.89152 for the Phantom III Chassis. | 8th Nov 1937 | Box 96 \ 2 scan0269 | |
| Results of a Tappet Setting Test for the 37-EX Phantom III. | 8th Nov 1937 | Box 96 \ 2 scan0270 | |
| Test log sheet showing numerical readings for 'A Side' and 'B Side' under cold and hot conditions. | 9th Nov 1937 | Box 96 \ 2 scan0271 | |
| Proposed modification to the Phantom III tappet filter to extend its operational time before cleaning. | 9th Nov 1937 | Box 96 \ 2 scan0272 | |
| Modifications to the Phantom III valve and ignition timing settings. | 12th Nov 1937 | Box 96 \ 2 scan0273 | |
| Modification to address overoiling issues in the Phantom III engine. | 26th Nov 1937 | Box 96 \ 2 scan0274 | |
| Instruction to check that banjo holes are clear when the tappet filter is cleaned. | 26th Nov 1937 | Box 96 \ 2 scan0275 | |
| Comparison photograph of a dirty and a clean Phantom III hydraulic tappet filter. | 6th Dec 1937 | Box 96 \ 2 scan0276 | |
| Report recommending a production change to reduce engine overoiling in the Phantom III after successful testing. | 6th Dec 1937 | Box 96 \ 2 scan0277 | |
| Depot sheet discussing overoiling issues on the Phantom III model and proposed modifications. | 13th Dec 1937 | Box 96 \ 2 scan0278 | |
| Blueprint detailing a modification to a Swivel Plug (PH III). | 10th Dec 1937 | Box 96 \ 2 scan0279 | |
| Deletion of self-adjusting tappets on the Phantom III and an attached article from Autocar. | 10th Jan 1938 | Box 96 \ 2 scan0280 | |
| Article discussing the benefits of self-adjusting tappets for car engines and predicting their widespread adoption. | 17th Jan 1938 | Box 96 \ 2 scan0281 | |
| Analysis on the possibility of using Wraith type tappets on the Phantom III engine and a suggestion to test the dimensions. | 17th Jan 1938 | Box 96 \ 2 scan0282 | |
| Proposal for modifying the Phantom III engine with .75' diameter tappets. | 13th Jan 1938 | Box 96 \ 2 scan0283 | |
| List of engineering suggestions for improving engine valvetrain performance. | 13th Jan 1938 | Box 96 \ 2 scan0284 | |
| Introduction and standardisation of bottom tappets for the Phantom III model. | 29th Apr 1938 | Box 96 \ 2 scan0285 | |
| New design for flat barrel type tappets for the Phantom III engine. | 2nd May 1938 | Box 96 \ 2 scan0286 | |
| Costs and implications of introducing simplified broached tappets for the Phantom III 'D' Series. | 3rd May 1938 | Box 96 \ 2 scan0287 | |
| Comparative cost figure for the Phantom III tappet mechanism. | 19th May 1938 | Box 96 \ 2 scan0288 | |
| Confirming cost savings for a simplified tappet mechanism for the Phantom 111. | 17th May 1938 | Box 96 \ 2 scan0289 | |
| Requesting an official order be passed to Richard Klinger Ltd. for 12 Phantom III rocker cover joints. | 24th Jun 1938 | Box 96 \ 2 scan0290 | |
| Technical memorandum regarding modifications to the Phantom III tappet to address wear issues. | 5th Jul 1938 | Box 96 \ 2 scan0291 | |
| Technical note regarding the cam form and valve lift curve for flat tappets on the Phantom III. | 7th Jul 1938 | Box 96 \ 2 scan0292 | |
| Feasibility, cost, and implications of modifying Phantom III tappets and washers. | 20th Jul 1938 | Box 96 \ 2 scan0293 | |
| Failure of tappet washers and proposing a new square washer for the Phantom III. | 4th Aug 1938 | Box 96 \ 2 scan0294 | |
| Note concerning barrel type tappets for the Bentley III and Phantom III models. | 9th Aug 1938 | Box 96 \ 2 scan0295 | |
| Investigation into scoring and wear issues on Phantom III tappets. | 4th Oct 1938 | Box 96 \ 2 scan0296 | |
| Service failures of camshafts and the proposal to implement barrel type tappets on the Phantom III chassis. | 4th Oct 1938 | Box 96 \ 2 scan0297 | |
| List of complaints regarding bottom tappets on the Phantom III model. | 4th Oct 1938 | Box 96 \ 2 scan0298 | |
| List of complaints and repairs for various chassis, focusing on tappet and camshaft issues. | 4th Oct 1938 | Box 96 \ 2 scan0299 | |
| The endurance testing and failure analysis of Wraith-type flat bottom tappets on a Phantom III engine. | 1st May 1939 | Box 96 \ 2 scan0300 | |
| Comparison of weight and design for the Phantom III and Wraith bottom tappets, considering strengthening and rod whipping. | 1st May 1939 | Box 96 \ 2 scan0301 | |
| Design and testing of new strengthened barrel-type tappets for the Phantom III engine. | 9th May 1939 | Box 96 \ 2 scan0302 | |
| The investigation into rapid tappet and camshaft wear on the Phantom III car. | 10th May 1939 | Box 96 \ 2 scan0303 | |
| Strengthening of Phantom III barrel tappets following a failure and requesting a new trial set. | 16th May 1939 | Box 96 \ 2 scan0304 | |
| Inadequate oil feed in Phantom III engines and the correction made to the valve gear. | 22th May 1939 | Box 96 \ 2 scan0305 | |
| Re-issue and modification of a strengthened tappet for the Phantom III. | 6th Jun 1939 | Box 96 \ 2 scan0306 | |
| Issues with chromium-plated tappets on the Phantom III and a new proposed reclamation process. | 14th Jul 1939 | Box 96 \ 2 scan0307 | |
| The failure of a scheme to convert Phantom III tappets and camshafts from hydraulic to non-hydraulic. | 24th Aug 1939 | Box 96 \ 2 scan0308 | |
| Note concerning the Tappets and Camshaft for a Phantom III, chassis number 3.AX.95. | 14th Aug 1939 | Box 96 \ 2 scan0309 | |
| The Phantom III camshaft and tappets, with a cross-reference to another file. | 18th Aug 1939 | Box 96 \ 2 scan0310 | |
| The Phantom III Rocker gear, D.L. Series. | 18th Aug 1939 | Box 96 \ 2 scan0311 | |
| Test report on car 33-MX after modifications, detailing issues with over-oiling and carburettor flooding. | 9th Sep 1935 | Box 96 \ 3 scan0001 | |
| Issues with gearbox performance, clutch modifications, and steering component fouling. | 9th Sep 1935 | Box 96 \ 3 scan0002 | |
| The unsafe condition of car 34-HX after a test run, noting faulty suspension, brakes, and second-hand parts. | 9th Sep 1935 | Box 96 \ 3 scan0003 | |
| Criticisms of car P.III; 33-EX after it was shown in Paris. | 22th Oct 1935 | Box 96 \ 3 scan0004 | |
| The Phantom III Demonstrator (No. 33-EX), detailing issues with tyre noise, steering, transmission, and gearbox. | 16th Oct 1935 | Box 96 \ 3 scan0005 | |
| Various vehicle performance issues and observations. | 16th Oct 1935 | Box 96 \ 3 scan0006 | |
| Trial run findings, including petrol consumption, rear axle issues, ride quality and potential improvements. | 16th Oct 1935 | Box 96 \ 3 scan0007 | |
| Concluding remarks on the road holding, directional stability, and smooth riding of the Phantom III chassis. | 16th Oct 1935 | Box 96 \ 3 scan0008 | |
| Cover note for a service report on the Phantom III 33-EX demonstration car from the Paris Show. | 25th Oct 1935 | Box 96 \ 3 scan0009 | |
| Various mechanical issues encountered during demonstration runs of a Phantom III vehicle from the Paris Show. | 25th Oct 1935 | Box 96 \ 3 scan0010 | |
| Faults found in a vehicle's clutch, ignition, springing, starting, and gearbox. | 25th Oct 1935 | Box 96 \ 3 scan0011 | |
| The arrangement and use of Phantom III trial cars 33-EX, 34-EX, and 35-EX. | 31th Oct 1935 | Box 96 \ 3 scan0012 | |
| Investigation into a noise complaint on car 35-EX, identifying the cause as tyre groan and comparing Goodrich, Dunlop and Avon tyres. | 1st Nov 1935 | Box 96 \ 3 scan0013 | |
| Tyre noise, engine decarbonisation for car 34-EX, and workshop logistics. | 4th Nov 1935 | Box 96 \ 3 scan0014 | |
| Tyre performance on car 34-EX, detonation issues, and plans to update and exchange car 33-EX. | 6th Nov 1935 | Box 96 \ 3 scan0015 | |
| Logistics for car 34-EX at the Scottish Show, a potential car swap, and testing Ethyl fuel. | 7th Nov 1935 | Box 96 \ 3 scan0016 | |
| Brief typed memo acknowledging a communication regarding Phantom III cars 36-EX and 37-EX. | 18th Nov 1935 | Box 96 \ 3 scan0017 | |
| Road test report on car 34-EX, detailing issues with tyre noise, engine noise, and a bonnet malfunction at high speed. | 19th Nov 1935 | Box 96 \ 3 scan0018 | |
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