| Description | Date | Identifier | |
| Modification to balance weights for existing forgings to reduce stress. | 26th Sep 1931 | Box 103 \ 3 scan0103 | |
| Blueprint for a crankshaft and crankcase, including modifications for a starter motor mounting. | 26th Sep 1931 | Box 103 \ 3 scan0104 | |
| Conclusions on balance weights, flywheel vibrations, and bearings for car engines. | 26th Sep 1931 | Box 103 \ 3 scan0105 | |
| Experiments with slipper wheels and damping loads for a 25 HP low inertia spring drive. | 30th Sep 1931 | Box 103 \ 3 scan0106 | |
| Confirming the decision to proceed with three experimental crankshafts for the 20/25 HP engine and querying a related design. | 1st Oct 1931 | Box 103 \ 3 scan0107 | |
| Changes to crankshaft forgings and balance weights for the 20/25 HP model. | 1st Oct 1931 | Box 103 \ 3 scan0108 | |
| Instructions for altering the dimensions of a 20/25 HP crankshaft and related components for testing. | 2nd Oct 1931 | Box 103 \ 3 scan0109 | |
| Sending an original document and updated blueprint information for a crankshaft and crankcase. | 3rd Oct 1931 | Box 103 \ 3 scan0110 | |
| Tests on a 25 HP engine to reduce roughness and vibration using a thin flange flywheel and Chrysler balance weights. | 5th Oct 1931 | Box 103 \ 3 scan0111 | |
| Telephone conversation about a petrol pump, crankshaft balance weight, and another project. | 5th Oct 1931 | Box 103 \ 3 scan0112 | |
| Request to manufacture a set of Chrysler balance weights according to attached sketches for testing on vehicle 1V-G6. | 6th Oct 1931 | Box 103 \ 3 scan0113 | |
| Cancelling an instruction for 20/25 HP crankshafts due to doubt over a new 8-weight balance scheme. | 6th Oct 1931 | Box 103 \ 3 scan0114 | |
| Notification of a material change for 20/25-HP chassis crankshaft forgings from Nickel Chrome Steel to V.C.M. Steel. | 7th Oct 1931 | Box 103 \ 3 scan0115 | |
| Request for a drawing of a 20/25 HP chassis crankshaft with specific dimensions for an urgent test. | 7th Oct 1931 | Box 103 \ 3 scan0116 | |
| Approved modifications to the 20/25 model crankshaft balance weights. | 8th Oct 1931 | Box 103 \ 3 scan0117 | |
| Proposed modification to the 20/25 HP crankshaft balance weights. | 2nd Oct 1931 | Box 103 \ 3 scan0118 | |
| Flywheel vibration and the adjustment of balance weights for a 25 HP engine. | 19th Oct 1931 | Box 103 \ 3 scan0119 | |
| Scheme for balancing a crankshaft using specific balance weights. | 20th Oct 1931 | Box 103 \ 3 scan0120 | |
| Request to manufacture two sets of spring damper springs for a 25 HP Spring Drive. | 26th Oct 1931 | Box 103 \ 3 scan0121 | |
| Specification sheet for a damping spring, detailing its dimensions and properties. | 27th Oct 1931 | Box 103 \ 3 scan0122 | |
| Implementation of alternative crankshaft balance weight schemes for the 25 HP engine. | 27th Oct 1931 | Box 103 \ 3 scan0123 | |
| Request to urgently order three modified crankshafts for a 20/25 HP chassis. | 27th Oct 1931 | Box 103 \ 3 scan0124 | |
| Machining of a 20-GIV crankshaft, slipper wheel, and balance weights. | 29th Oct 1931 | Box 103 \ 3 scan0125 | |
| Balancing of crankshaft weights and associated machining processes. | 2nd Nov 1931 | Box 103 \ 3 scan0126 | |
| Request to manufacture sets of springs for a 25 HP low inertia spring drive. | 5th Nov 1931 | Box 103 \ 3 scan0127 | |
| Specification card for a driving spring detailing wire diameter, coil count, helix diameter and length. | 7th Nov 1931 | Box 103 \ 3 scan0128 | |
| Test report on the relative merits of standard and low inertia spring drives and balance weights for the 25 HP engine. | 7th Nov 1931 | Box 103 \ 3 scan0129 | |
| Blueprint for applying Chrysler Type Balance Weights to a 20/25 HP Chassis crankshaft. | 24th Nov 1931 | Box 103 \ 3 scan0130 | |
| Design for a modified 20/25 HP crankshaft created from existing forgings. | 21th Nov 1931 | Box 103 \ 3 scan0131 | |
| Tests to eliminate timing gear rattles on the 25 HP engine following the introduction of a new camshaft. | 30th Nov 1931 | Box 103 \ 3 scan0132 | |
| Experiments measuring the effect of balance weights on 25 HP engine flywheel vibration. | 1st Dec 1931 | Box 103 \ 3 scan0133 | |
| Blueprint of a mechanical component with dimensions and force loads. | 1st Dec 1931 | Box 103 \ 3 scan0134 | |
| Photographic study of crankshaft vibration patterns under various balance conditions. | 4th Dec 1931 | Box 103 \ 3 scan0135 | |
| The production of three crankshafts for the 20/25 HP chassis and a discussion on journals for the 'U' series. | 4th Dec 1931 | Box 103 \ 3 scan0136 | |
| Decision to use Nitro Alloy for all future experimental crankshafts following successful 10,000-mile tests. | 7th Dec 1931 | Box 103 \ 3 scan0137 | |
| Request to issue details for a modified 25 HP crankshaft with 2.250 journals. | 10th Dec 1931 | Box 103 \ 3 scan0138 | |
| Standardisation and dimensions of balance weights for a 20/25 HP chassis balanced crankshaft. | 17th Dec 1931 | Box 103 \ 3 scan0139 | |
| Scheme for fitting a 2.250 journal crankshaft to the J.1 high compression Japan unit. | 18th Dec 1931 | Box 103 \ 3 scan0140 | |
| Clarifying the machining instructions for new crankshaft forgings. | 18th Dec 1931 | Box 103 \ 3 scan0141 | |
| Production dimensions of a small balance weight for a 25 HP crankshaft. | 18th Dec 1931 | Box 103 \ 3 scan0142 | |
| Giving instructions on the machining of new 25 HP crankshaft forgings. | 21th Dec 1931 | Box 103 \ 3 scan0143 | |
| Standardisation sheet for the Low Inertia Spring Drive, detailing the required springs and loads. | 1st Jan 1932 | Box 103 \ 3 scan0144 | |
| Standardisation sheet for the Low Inertia Spring Drive incorporated with the balanced crankshaft. | 5th Jan 1932 | Box 103 \ 3 scan0145 | |
| Request for the weights of various crankshafts (25 HP, 40/50 HP, 18-GTV) and their balance weights. | 11th Jan 1932 | Box 103 \ 3 scan0146 | |
| Analysis of torsional vibration issues in the J.3 crankshaft and damper system. | 1st Mar 1932 | Box 103 \ 3 scan0147 | |
| Requesting a test on the J.3 crankshaft's inertia during gear noise experiments. | 3rd Mar 1932 | Box 103 \ 3 scan0148 | |
| Issues with incorrect spring gauge and driving load on a 25HP low inertia spring drive. | 22th Mar 1932 | Box 103 \ 3 scan0149 | |
| Urgent request for an experiment on a 25 HP spring drive to resolve issues with gear rattles. | 13th Apr 1932 | Box 103 \ 3 scan0150 | |
| Arrangement of additional inertia to 25 HP spring drive. | 18th Apr 1932 | Box 103 \ 3 scan0151 | |
| Standardisation of a balanced crankshaft, nose piece, low inertia slipper wheel and thin web flywheel. | 5th Jan 1932 | Box 103 \ 3 scan0152 | |
| Authorization form for fitting a new part to a chassis, detailing the chassis number and associated costs. | 30th Jan 1939 | Box 103 \ 3 scan0153 | |
| Standardisation of a low inertia spring drive incorporated with a balanced crankshaft. | 4th Jan 1932 | Box 103 \ 3 scan0154 | |
| Standardisation form for a new chassis part. | 28th Sep 1938 | Box 103 \ 3 scan0155 | |
| Standardisation of a Low Inertia spring drive incorporated with a balanced crankshaft. | 4th Jan 1932 | Box 103 \ 3 scan0156 | |
| Standardisation sheet detailing the introduction of a new part to a chassis. | 4th Jan 1932 | Box 103 \ 3 scan0157 | |
| Standardisation sheet for a wheel case designed to suit a low inertia spring drive. | 4th Jan 1932 | Box 103 \ 3 scan0158 | |
| Standardisation sheet detailing the fitting of a new part to a chassis and associated costs. | 21th Apr 1932 | Box 103 \ 3 scan0159 | |
| Confirming modifications to Low Inertia Crankshaft Dampers for the 20/25 and Phantom II models. | 21th Apr 1932 | Box 103 \ 3 scan0160 | |
| Standardisation of a 25 HP. Nitro Alloy Crankshaft. | 9th Jun 1932 | Box 103 \ 3 scan0161 | |
| Standardisation report for a new chassis part, noting costs and implementation details. | 12th Sep 1932 | Box 103 \ 3 scan0162 | |
| Eliminating engine gear rattle on P.2 & 25 HP models using a modified dynamo drive. | 12th Sep 1932 | Box 103 \ 3 scan0163 | |
| Eliminating engine gear rattles by fitting a special flexible drive, crediting Mr. McStay for the scheme. | 13th Sep 1932 | Box 103 \ 3 scan0164 | |
| Standardisation sheet concerning a crankshaft with 2.250 journals for a 20/25 HP chassis. | 31th Oct 1932 | Box 103 \ 3 scan0165 | |
| To hold all work on the 20/25 HP Chassis crankshaft pending a new design drawing. | 8th Nov 1932 | Box 103 \ 3 scan0166 | |
| Increase in crankshaft diameter for the 20/25 type engine and specifying V.C.M. steel for all new crankshafts. | 9th Nov 1932 | Box 103 \ 3 scan0167 | |
| Design issues with the J.I. crankshaft, specifically the journal diameter and slipper wheel. | 29th Nov 1932 | Box 103 \ 3 scan0168 | |
| Need to use studs instead of bolts for main bearings on the Bensport engine due to a larger crankshaft. | 21th Dec 1932 | Box 103 \ 3 scan0169 | |
| The dynamic balancing of 25 HP crankshafts using a Trebel balancing machine. | 30th Jan 1933 | Box 103 \ 3 scan0170 | |
| Out-of-balance measurements for several shafts, with a note on a specific correction. | 9th Feb 1933 | Box 103 \ 3 scan0171 | |
| Proposed modification to increase lubrication holes in chassis crankshafts. | 9th Feb 1933 | Box 103 \ 3 scan0172 | |
| Modifications to the 25-HP and Bensport Crankshaft Slipper Drive. | 4th May 1933 | Box 103 \ 3 scan0173 | |
| Theoretical calculations and road test results for a J.3. crankshaft. | 9th May 1933 | Box 103 \ 3 scan0174 | |
| Internal order request for 12 Ferobestos friction discs for the 20/25 Spring Drive. | 10th May 1933 | Box 103 \ 3 scan0175 | |
| Issues with the Bentley J.III crankshaft and the number of main bearings. | 31th Jul 1933 | Box 103 \ 3 scan0176 | |
| Pros and cons of different crankshaft bearing arrangements and related material choices. | 2nd Aug 1933 | Box 103 \ 3 scan0177 | |
| Piston construction and gudgeon pin development for six-cylinder engines. | 2nd Aug 1933 | Box 103 \ 3 scan0178 | |
| Balance weights should be forged solid with the crankshaft. | 31th Aug 1935 | Box 103 \ 3 scan0179 | |
| Parts summary for modifying the 20/25 HP chassis crankcase and crankshaft. | 31th Aug 1933 | Box 103 \ 3 scan0180 | |
| Feasibility and risks of making balance weights solid with the crankshaft, referencing balance weight failure on a Bentley engine. | 1st Sep 1933 | Box 103 \ 3 scan0181 | |
| Standardisation of a stiffer crankshaft for the 3 1/2 Litre Bentley. | 20th Jun 1933 | Box 103 \ 3 scan0182 | |
| Standardisation of Chassis Parts form. | 30th Dec 1933 | Box 103 \ 3 scan0183 | |
| The standardization and balance of crankshafts for the 20/25 model 10,000 miles test. | 5th Jan 1934 | Box 103 \ 3 scan0184 | |
| Agreeing to test heavier balance weights on a 25-HP crankshaft and providing the relevant drawing. | 8th Jan 1934 | Box 103 \ 3 scan0185 | |
| Instructions for an experimental Goshawk crankshaft with increased balance weights from existing forgings. | 26th Jan 1934 | Box 103 \ 3 scan0186 | |
| Experiment to add bolted-on balance weights to a Goshawk crankshaft. | 30th Jan 1934 | Box 103 \ 3 scan0187 | |
| Fitting of overhanging balance weights to the 20/25 model. | 30th May 1934 | Box 103 \ 3 scan0188 | |
| The introduction of overhanging crankshaft balance weights for the 20/25 HP chassis. | 5th Jun 1934 | Box 103 \ 3 scan0189 | |
| Standardisation of parts for an increased balance weight on a crankshaft. | 6th Jun 1934 | Box 103 \ 3 scan0190 | |
| Cost estimate and production feasibility note for extra jigs, tools, and equipment for the 'F' series chassis. | 22th Jun 1934 | Box 103 \ 3 scan0191 | |
| Letter to a supplier about an unsatisfactory oil retaining felt on 20/25 engines, asking for suggestions. | 28th Sep 1934 | Box 103 \ 3 scan0192 | |
| Letter from Super Oil Seal Manfg. Co. regarding a proposal for a split seal for 20/25 engines. | 1st Oct 1934 | Box 103 \ 3 scan0193 | |
| Concerns about excessive crankshaft wear on Bentley and 20/25 models. | 10th Oct 1934 | Box 103 \ 3 scan0194 | |
| Standardisation of a felt oil retaining ring at the rear of the crankshaft bearing. | 26th Sep 1934 | Box 103 \ 3 scan0195 | |
| Cost estimate for extra jigs, tools, and equipment for the 'D.2' series production. | 18th Sep 1934 | Box 103 \ 3 scan0196 | |
| Letter from Charles Weston & Co., Ltd. regarding the supply of Gits Patent Precision Oil Seals. | 5th Apr 1935 | Box 103 \ 3 scan0197 | |
| Letter to Charles Weston & Co. Ltd. regarding a drawing of a felt oil retaining device and the testing of a split seal. | 9th Apr 1935 | Box 103 \ 3 scan0198 | |
| Letter from Charles Weston & Co. regarding a Gits Patent Precision Oil Seal for a 20/25 engine crankshaft. | 11th Apr 1935 | Box 103 \ 3 scan0199 | |
| Letter returning a consignment of oil seals for examination and outlining future requirements. | 16th Mar 1936 | Box 103 \ 3 scan0200 | |
| Crankshaft damper issues and required treatments for cotton duck washers on 25/30 HP engines. | 12th Jan 1938 | Box 103 \ 3 scan0201 | |
| Fierce clutches in 20/25 HP and 3.5 Litre Bentley models and a proposed fix using Ferodo sections. | 9th Aug 1939 | Box 103 \ 3 scan0202 | |
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