| Description | Date | Identifier | |
| Recurring 'drive rattle' issue on a Bentley chassis and seeking alternative repair methods for the driving dogs. | 15th Sep 1937 | Box 102 \ 4 scan0161 | |
| Broken cage in a pinion bearing and issues with driving dogs. | 15th Sep 1937 | Box 102 \ 4 scan0162 | |
| Technical memo regarding noisy Bentley rear axles due to pinion bearing preload loss. | 13th Sep 1937 | Box 102 \ 4 scan0163 | |
| Method for checking and regaining preload on pinion bearings. | 10th Sep 1937 | Box 102 \ 4 scan0164 | |
| Requesting information about a pinion bearing failure with a broken cage. | 11th Sep 1937 | Box 102 \ 4 scan0165 | |
| Faulty pinion from a noisy rear axle on a Bentley chassis, possibly due to insufficient hardening. | 10th Sep 1937 | Box 102 \ 4 scan0166 | |
| Clearance issues and remedies for Bentley Rear Axle Thrust Races. | 9th Sep 1937 | Box 102 \ 4 scan0167 | |
| Thrust race removed from car B.114.GA due to a running hot complaint. | 1st Sep 1937 | Box 102 \ 4 scan0168 | |
| Cover sheet for a report on transmission failures. | 17th Aug 1937 | Box 102 \ 4 scan0169 | |
| Transmission and road shaft failures, listing maintenance history for several vehicles. | 11th Aug 1937 | Box 102 \ 4 scan0170 | |
| Two instances of shaft failures, including vehicle maintenance history and mileage. | 11th Aug 1937 | Box 102 \ 4 scan0171 | |
| Noisy axle and faulty bedding of a ball race on a Bentley Chassis B-138-JD. | 29th Jun 1937 | Box 102 \ 4 scan0172 | |
| Propeller shaft damper and noise issue on a Bentley rear axle. | 26th Jun 1937 | Box 102 \ 4 scan0173 | |
| Axle noise on a Bentley and the fitting of a propeller shaft damper. | 25th Jun 1937 | Box 102 \ 4 scan0174 | |
| The failure of thrust cages in pinion bearings and a request for returned parts for examination. | 25th Jun 1937 | Box 102 \ 4 scan0175 | |
| Attempts to quiet a noisy Bentley rear axle, with a secondary finding of tyre noise. | 24th Jun 1937 | Box 102 \ 4 scan0176 | |
| Returning a defective rear axle unit from a 3½-litre car, detailing previous failures and the vehicle's neglected condition. | 23th Jun 1937 | Box 102 \ 4 scan0177 | |
| Corrections made to a Bentley 138.J.D. rear axle following a road test. | 23th Jun 1937 | Box 102 \ 4 scan0178 | |
| Bentley axle noise complaint caused by an incorrect radius on the pinion ball race housing. | 22th Jun 1937 | Box 102 \ 4 scan0179 | |
| Repeated Bentley rear axle failure, attributed to the owner's reckless driving. | 22th Jun 1937 | Box 102 \ 4 scan0180 | |
| Mr. Sopwith's Phantom III which has rear axle trouble and needs to be brought to the Works. | 15th Jun 1937 | Box 102 \ 4 scan0181 | |
| Return of a faulty rear axle unit from a 4¼-litre Smiley chassis for examination and overhaul. | 9th Jun 1937 | Box 102 \ 4 scan0182 | |
| The slack measurement on the inner roller bearings of a Bentley rear axle pinion. | 4th Jun 1937 | Box 102 \ 4 scan0183 | |
| The failure of a rear axle thrust race for a 3.5-litre chassis, identifying incorrect assembly as the cause. | 2nd Jun 1937 | Box 102 \ 4 scan0184 | |
| Log of transmission failures, categorized by driver dogs and road shafts. | 5th Jul 1937 | Box 102 \ 4 scan0185 | |
| Faulty Bentley rear axle (170-GA) being returned due to a badly picked up pinion. | 28th May 1937 | Box 102 \ 4 scan0186 | |
| Owner's complaint report No.139 regarding a transmission failure and a jammed rear axle driver dog. | 10th May 1937 | Box 102 \ 4 scan0187 | |
| Thickness discrepancy and material query for Bentley Pinion packing washers. | 6th May 1937 | Box 102 \ 4 scan0188 | |
| The dismantling and investigation of a noisy Bentley rear axle, chassis B.75 HM. | 6th May 1937 | Box 102 \ 4 scan0189 | |
| Reminder memo concerning the dispatch of faulty 'D' series Bentley Hubs to Dunlops for inspection. | 6th May 1937 | Box 102 \ 4 scan0190 | |
| Work carried out on noisy Bentley rear axles. | 3rd May 1937 | Box 102 \ 4 scan0191 | |
| Inspection report detailing the failure analysis of a pinion bearing assembly. | 4th May 1937 | Box 102 \ 4 scan0192 | |
| Strip report on a customer's Bentley rear axle which has had repeated bearing trouble. | 1st May 1937 | Box 102 \ 4 scan0193 | |
| The propeller shaft damper on a Bentley rear axle and its correct poundage setting. | 27th Apr 1937 | Box 102 \ 4 scan0194 | |
| Road test on a Bentley rear axle. | 26th Apr 1937 | Box 102 \ 4 scan0195 | |
| Failure of a pinion race and the return of the associated rear axle unit. | 23th Apr 1937 | Box 102 \ 4 scan0196 | |
| Trial log for a Bentley rear axle pinion, schedule Sch.23493. | 9th Apr 1937 | Box 102 \ 4 scan0197 | |
| Faulty hub from a 'DG' Series Bentley be 'stolen' for inspection by Dunlops to investigate 'wheel driver knocks'. | 9th Apr 1937 | Box 102 \ 4 scan0198 | |
| Returned axle and a request to measure the pinion bearings for alignment. | 2nd Apr 1937 | Box 102 \ 4 scan0199 | |
| Recurring failure in Bentley rear axle drives and proposing a modification with a tie rod. | 2nd Apr 1937 | Box 102 \ 4 scan0200 | |
| Faulty Bentley front axle with a broken drill bit found wedged in a duct. | 31th Mar 1937 | Box 102 \ 4 scan0201 | |
| Faulty Bentley rear axle from chassis 105.BL, detailing a broken driver and sheared splines. | 25th Mar 1937 | Box 102 \ 4 scan0202 | |
| Failure analysis of two different pinion bearings and a proposal for an axle replacement. | 24th Mar 1937 | Box 102 \ 4 scan0203 | |
| The contents of a parcel containing faulty Bentley car parts for inspection. | 23th Mar 1937 | Box 102 \ 4 scan0204 | |
| Improvements and trials related to the Bentley rear axle, including securing bolts, bearings, and lubrication. | 19th Feb 1937 | Box 102 \ 4 scan0205 | |
| Modifications to the Bentley rear axle to address leaks and test new bearings. | 18th Feb 1937 | Box 102 \ 4 scan0206 | |
| Requesting information on oil leaks from the Bentley rear axle casing. | 13th Feb 1937 | Box 102 \ 4 scan0207 | |
| Technical memo discussing oil leaks and thrust bearings in the Bentley rear axle. | 16th Feb 1937 | Box 102 \ 4 scan0208 | |
| The dispatch of three sets of parts for a Bentley rear axle for trials. | 29th Jan 1937 | Box 102 \ 4 scan0209 | |
| The increasing issue of wheel driver knock on the 4 1/4-litre Bentley, with observations on wear patterns and manufacturing defects. | 13th Nov 1936 | Box 102 \ 4 scan0210 | |
| Proposal to modify the driver dog design by increasing spline length to reduce wear. | 13th Nov 1936 | Box 102 \ 4 scan0211 | |
| Page discussing a potential design alteration to a driver dog to reduce wear and address a knock. | 20th Oct 1936 | Box 102 \ 4 scan0212 | |
| Customer complaint regarding a sheared rear axle driving shaft on a 3 1/2 litre Bentley. | 20th Oct 1936 | Box 102 \ 4 scan0213 | |
| Growing complaint about driving dogs on the 4¼ litre Bentley. | 27th Oct 1936 | Box 102 \ 4 scan0214 | |
| Customer complaints of wear on the Bentley 4.1/4 Litre driving dogs and splines. | 18th Aug 1936 | Box 102 \ 4 scan0215 | |
| Problematic rear wheel hubs on a Bentley, comparing suppliers Rudge Whitworth and Dunlop. | 20th Mar 1937 | Box 102 \ 4 scan0216 | |
| Test report on a Bentley 178.JD regarding an over-run issue with the rear axle. | 11th May 1937 | Box 102 \ 4 scan0217 | |
| Bentley complaints about pinion bearing oil leaks and issues with wheel drivers. | 15th Mar 1937 | Box 102 \ 4 scan0218 | |
| Faults and reports on four Bentley rear axles, specifically issues with ball races. | 10th May 1937 | Box 102 \ 4 scan0219 | |
| Shipment of two worn Bentley drums and hubs with driving dog rattle. | 11th May 1937 | Box 102 \ 4 scan0220 | |
| Bentley 4¼ with a broken rear axle towed in for repair. | 11th May 1937 | Box 102 \ 4 scan0221 | |
| Bentley complaints, specifically rear axle troubles, pinion bearing issues, and oil leaks. | 7th Apr 1937 | Box 102 \ 4 scan0222 | |
| Requesting to find a customer's car to test parts to fix a recurring rear axle thrust race issue. | 23th Jan 1937 | Box 102 \ 4 scan0223 | |
| Faulty Bentley valve spring and the subsequent special examination to prevent future defects. | 1st Jan 1937 | Box 102 \ 4 scan0224 | |
| Letter discussing parts delays for car 22-G-V and investigating engine misfiring issues related to fuel type and spark plugs. | 6th Jul 1936 | Box 102 \ 4 scan0225 | |
| Query regarding the potential adoption of Scheme 876, a modification to the 20-HP valve rocker mechanism. | 4th Apr 1927 | Box 102 \ 5 scan0001 | |
| 20 HP engine power development, focusing on camshaft experiments. | 23th May 1927 | Box 102 \ 5 scan0002 | |
| Engine performance comparing standard and long-duration camshafts, discussing power curves, B.M.E.P., and valve bounce. | 31th Mar 1927 | Box 102 \ 5 scan0003 | |
| Experiment showing that high induction pipe depression reduces the advantage possible with long duration cams. | 31th Mar 1927 | Box 102 \ 5 scan0004 | |
| Camshaft modifications detailing the impact on engine power, consumption, and efficiency. | 31th Mar 1927 | Box 102 \ 5 scan0005 | |
| Engine performance test results, conclusions, and proposals for further development on the 20 HP and Phantom engines. | 26th May 1927 | Box 102 \ 5 scan0006 | |
| 20 HP engine test using a long-duration camshaft and stronger valve springs to increase power and prevent valve bounce. | 26th May 1927 | Box 102 \ 5 scan0007 | |
| The intention to trial Stromberg carburetters to gather information on low depression. | 26th May 1927 | Box 102 \ 5 scan0008 | |
| Performance graph showing the increase in Brake Horse Power and Brake Mean Effective Pressure for a 20 HP engine after various modifications. | 6th Oct 1928 | Box 102 \ 5 scan0009 | |
| New cam forms for valves, spring pressure, and valve lift curves for various car and aero engines. | 6th Oct 1928 | Box 102 \ 5 scan0010 | |
| Practical considerations for camshaft design, including valve lift curves and floating speed. | 20th Dec 1928 | Box 102 \ 5 scan0011 | |
| Valve timing and camshaft design for the 20 HP car. | 8th Jun 1929 | Box 102 \ 5 scan0012 | |
| Performance improvements for the 20 HP car, focusing on pistons, camshafts, valves, and exhaust systems for experimental chassis. | 11th Oct 1929 | Box 102 \ 5 scan0013 | |
| Assumed power increases for large and small bore engines, and the fitting of cutouts to 20 HP models. | 5th Nov 1929 | Box 102 \ 5 scan0014 | |
| Comparison of power output and performance between 116° and 110° camshafts on the 'China' engine. | 5th Nov 1929 | Box 102 \ 5 scan0015 | |
| Camshaft and engine performance tests, discussing detonation, compression ratios, and fuel doping. | 5th Nov 1929 | Box 102 \ 5 scan0016 | |
| Blueprint graph comparing the open exhaust power curves of a 116° camshaft versus a standard 110° camshaft on a 'China' engine. | 4th Nov 1929 | Box 102 \ 5 scan0017 | |
| Comparison of a 116° camshaft versus the standard camshaft on a Standard China Engine, detailing performance differences. | 2nd Nov 1929 | Box 102 \ 5 scan0018 | |
| Continued page discussing the performance of a 115° camshaft and recommending the standard camshaft. | 1st Nov 1929 | Box 102 \ 5 scan0019 | |
| Graph comparing the performance of a 110° and a 116° camshaft on a standard 'China' engine. | 12th Nov 1929 | Box 102 \ 5 scan0020 | |
| Experiment comparing long (116°) and short (110°) duration camshafts on a 20/25HP engine to analyze low power causes. | 16th Nov 1929 | Box 102 \ 5 scan0021 | |
| Adjustments to camshaft duration and tappet clearance to address low engine power at high speeds. | 16th Nov 1929 | Box 102 \ 5 scan0022 | |
| Comparison of different camshafts on the 'Japan' engine and related test results. | 19th Nov 1929 | Box 102 \ 5 scan0023 | |
| B.M.E.P. readings at various RPMs for a specific camshaft configuration and plans for further testing. | 19th Nov 1929 | Box 102 \ 5 scan0024 | |
| Graphical comparison of two camshafts (110° and 116°) on Engine N° IV G-8, plotting Brake Horse Power and B.M.E.P. against engine RPM. | 16th Nov 1929 | Box 102 \ 5 scan0025 | |
| Test report on a 112º long duration camshaft for the 'China' engine, comparing performance against other camshafts. | 20th Dec 1929 | Box 102 \ 5 scan0026 | |
| Performance graph comparing different camshaft configurations for Engine No GOS-C1. | 14th Dec 1929 | Box 102 \ 5 scan0027 | |
| Improvements and testing for a 20 HP long duration camshaft. | 18th Mar 1930 | Box 102 \ 5 scan0028 | |
| Instruction to fit a 112° camshaft to engine GOS.C.1 and subsequently fit the engine into car 12-G4. | 25th Apr 1930 | Box 102 \ 5 scan0029 | |
| Table of ignition advance settings at various engine RPMs. | 25th Apr 1930 | Box 102 \ 5 scan0030 | |
| Graph of engine compression pressures versus RPM, comparing different camshaft configurations. | 25th Apr 1930 | Box 102 \ 5 scan0031 | |
| Performance comparison between long and short duration camshafts at different compression ratios. | 26th Apr 1930 | Box 102 \ 5 scan0032 | |
| Test report on a 112° long-duration camshaft, comparing performance with different compression ratios and valve timings. | 26th Apr 1930 | Box 102 \ 5 scan0033 | |
| Analysis of engine performance concerning power, detonation, and ignition settings with different camshafts and compression ratios. | 26th Apr 1930 | Box 102 \ 5 scan0034 | |
| Performance graph comparing Brake Horse Power and B.M.E.P. for different camshaft and high compression configurations. | 24th Apr 1930 | Box 102 \ 5 scan0035 | |
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