| Description | Date | Identifier | |
| Manufacturing difficulties with the Bentley 80 Crankshaft, EB.4104, regarding oil caps and taper plugs. | 25th Oct 1938 | Box 123 \ 5 scan0130 | |
| The testing of expanding disc oil caps for crankshafts, detailing issues with leakage, vibration and extraction. | 25th Oct 1938 | Box 123 \ 5 scan0131 | |
| The design of an eight-point ignition distributor, D.CD.973, for the B.80 engine. | 26th Oct 1938 | Box 123 \ 5 scan0132 | |
| Notification regarding new drawings for valve springs and washers for the Bentley 60 Chassis to accommodate increased valve lift. | 26th Oct 1938 | Box 123 \ 5 scan0133 | |
| Instructions and blueprint details for Bentley 80 Chassis crankshaft revisions. | 27th Oct 1938 | Box 123 \ 5 scan0134 | |
| The difficulty in making pressed-in oil caps for the B.80 crankshaft, suggesting a review of American practices. | 26th Oct 1938 | Box 123 \ 5 scan0135 | |
| The Bentley 60 Chassis camshaft, valve lift curve, and the issue of new drawings. | 27th Oct 1938 | Box 123 \ 5 scan0136 | |
| Confirming the completion of issuing details for the cast iron engine mounting. | 27th Oct 1938 | Box 123 \ 5 scan0137 | |
| The alteration of the taper screw plug for crankshaft oil holes on Bentley 60 and 80 models. | 28th Oct 1938 | Box 123 \ 5 scan0138 | |
| Modifying inlet valve guides for engines with increased valve lift. | 29th Oct 1938 | Box 123 \ 5 scan0139 | |
| Instructions regarding an experiment on a Bentley 60 Chassis involving a new sodium-cooled exhaust valve. | 31th Oct 1938 | Box 123 \ 5 scan0140 | |
| Excessive wear on Bentley 60 oil pump and distributor drive gears, with proposed modifications. | 31th Oct 1938 | Box 123 \ 5 scan0141 | |
| Proposal for a sodium-cooled exhaust valve design to overcome engine overheating and detonation at 3000 rpm. | 31th Oct 1938 | Box 123 \ 5 scan0142 | |
| Modification to the Bentley B.60 oil pump to address excessive wear on spiral gears. | 2nd Nov 1938 | Box 123 \ 5 scan0143 | |
| The modification of the induction pipe for a straight 8 engine to fit a new Stromberg carburetter. | 2nd Nov 1938 | Box 123 \ 5 scan0144 | |
| Notification regarding new drawings and blueprints for the Bentley 60 Chassis piston section. | 2nd Nov 1938 | Box 123 \ 5 scan0145 | |
| New drawings for the Bentley 80 Chassis crankcase and front engine mounting. | 3rd Nov 1938 | Box 123 \ 5 scan0146 | |
| Dynamometer testing of an axle and gears for an 8-cylinder car. | 4th Nov 1938 | Box 123 \ 5 scan0147 | |
| New drawings for the Bentley 60 Chassis camshaft and flywheel timing marks. | 7th Nov 1938 | Box 123 \ 5 scan0148 | |
| Modification details for the Oil Pump Drive Gear on the Camshaft of a Bentley 60 Chassis. | 7th Nov 1938 | Box 123 \ 5 scan0149 | |
| Instruction memo regarding new drawings for a modified inlet valve spring for the Bentley 60 Chassis. | 9th Nov 1938 | Box 123 \ 5 scan0150 | |
| The modifications required to fit a B.60 engine into a Wraith III chassis, focusing on controls, pipes and the carburetter. | 9th Nov 1938 | Box 123 \ 5 scan0151 | |
| One-off modification details for a fan, air intake silencer, and exhaust pipe for a Wraith III system. | 9th Nov 1938 | Box 123 \ 5 scan0152 | |
| Installation process for six and eight-cylinder cast iron engines in a prototype frame. | 9th Nov 1938 | Box 123 \ 5 scan0153 | |
| Experiments on vacuum-assisted systems and a proposed design to simplify the servo for hydraulic front brakes. | 9th Nov 1938 | Box 123 \ 5 scan0154 | |
| Modification to exhaust ports to improve valve cooling for B.60, B.80, and large bore engines. | 10th Nov 1938 | Box 123 \ 5 scan0155 | |
| Modifications to the flywheel and clutch casing for the B.60 Cast Iron Engine to reduce weight. | 10th Nov 1938 | Box 123 \ 5 scan0156 | |
| Instructions for new engine controls on the Bentley 60 Chassis, detailing modifications for a B.60 engine. | 11th Nov 1938 | Box 123 \ 5 scan0157 | |
| List of modifications and examinations for a returned B.60 No.1 engine unit. | 11th Nov 1938 | Box 123 \ 5 scan0158 | |
| Modifications for fitting a Bentley 60 engine into a Wraith III chassis, focusing on the front engine mounting, fan, and bottom water pipe. | 11th Nov 1938 | Box 123 \ 5 scan0159 | |
| The top water connection for fitting a B.60 engine into a Wraith III chassis. | 11th Nov 1938 | Box 123 \ 5 scan0160 | |
| Instructions for the exhaust downtake pipe on a B.60 engine in a Wraith III chassis. | 12th Nov 1938 | Box 123 \ 5 scan0161 | |
| List of new blueprints for the Bentley 60 Chassis Cast Iron Engine, focusing on the crankcase and bearings section. | 14th Nov 1938 | Box 123 \ 5 scan0162 | |
| Request to produce and fit short brass bends to the Bentley 60 experimental induction system. | 14th Nov 1938 | Box 123 \ 5 scan0163 | |
| Requesting the production of induction system parts for the B.60 engine. | 15th Nov 1938 | Box 123 \ 5 scan0164 | |
| Requesting blueprints and parts for a Bentley 80 crankcase, specifically for a Delco-Remy distributor assembly. | 15th Nov 1938 | Box 123 \ 5 scan0165 | |
| Requesting blueprints for new inlet pipe components for the Bentley 80 Chassis. | 15th Nov 1938 | Box 123 \ 5 scan0166 | |
| Blueprints for a PD.305 Exhaust Valve Spring for the B.60 Large Bore engine. | 16th Nov 1938 | Box 123 \ 5 scan0167 | |
| The installation of a Bentley 60 Engine in a Wraith III Chassis, detailing new drawings for water connections and the fan. | 17th Nov 1938 | Box 123 \ 5 scan0168 | |
| Casting programme and progress report for the B.60 Crankcase. | 17th Nov 1938 | Box 123 \ 5 scan0169 | |
| Design specifications for B.60 engine units 3, 4, 5, and 6. | 17th Nov 1938 | Box 123 \ 5 scan0170 | |
| List of modifications for various engine components including pistons, cylinder heads, and valves. | 17th Nov 1938 | Box 123 \ 5 scan0171 | |
| List of modifications and specifications for various engine components. | 17th Nov 1938 | Box 123 \ 5 scan0172 | |
| Adaptor flanges for Wraith and Bentley induction systems. | 17th Nov 1938 | Box 123 \ 5 scan0173 | |
| Discussion memo on production delays and costs for 6-cylinder and 8-cylinder engine patterns. | 17th Nov 1938 | Box 123 \ 5 scan0174 | |
| Foundry problems with an 8-cylinder pattern and outlining a proposed car engine program. | 17th Nov 1938 | Box 123 \ 5 scan0175 | |
| Series of questions regarding the costs and logistics for new engine pattern equipment. | 17th Nov 1938 | Box 123 \ 5 scan0176 | |
| Progress report on the production of crankcase and cylinder castings for Bentley 60 and 80 units. | 21th Sep 1938 | Box 123 \ 5 scan0177 | |
| Instructions for required parts for the water connections for a Bentley 60 Engine in a Wraith III Chassis. | 22th Nov 1938 | Box 123 \ 5 scan0178 | |
| The production of cast iron straight 8 engines and the interchangeability of parts with a planned aluminium version. | 22th Nov 1938 | Box 123 \ 5 scan0179 | |
| Additional front crossmember for installing a Bentley B.60 engine into a Wraith III chassis. | 22th Nov 1938 | Box 123 \ 5 scan0180 | |
| Internal memorandum detailing preparation instructions for a B.60 No. 1 UNIT for a 100-hour endurance run. | 23th Nov 1938 | Box 123 \ 5 scan0181 | |
| Modifications to B.60 exhaust valves to prevent sodium leakage. | 24th Nov 1938 | Box 123 \ 5 scan0182 | |
| Instructions for fitting a Bentley 60 Engine into a Wraith III chassis, focusing on cylinder head and carburetter air silencer modifications. | 24th Nov 1938 | Box 123 \ 5 scan0183 | |
| New blueprints for a Bump Crown Piston on a Bentley 60 Chassis with a cast iron engine. | 24th Nov 1938 | Box 123 \ 5 scan0184 | |
| Scheme detailing the clutch actuation for the B.60 engine unit in a Wraith III chassis. | 25th Nov 1938 | Box 123 \ 5 scan0185 | |
| Modifications and repairs required for a B.60 Unit No.2 prior to chassis fitting. | 25th Nov 1938 | Box 123 \ 5 scan0186 | |
| Authorising proceeding with the production of crankshafts and balance weights for B.60 units. | 26th Nov 1938 | Box 123 \ 5 scan0187 | |
| Requesting an adaptation to the shape of exhaust ports for the Bentley 60 and 80 Cast Iron Engine. | 29th Nov 1938 | Box 123 \ 5 scan0188 | |
| The adaptation of exhaust ports for the Bentley 60 and 80 Cast Iron Engine. | 29th Nov 1938 | Box 123 \ 5 scan0189 | |
| Instructions and list of new drawings for the Bentley 60 Chassis (Cast Iron Engine) valves and fittings. | 29th Nov 1938 | Box 123 \ 5 scan0190 | |
| Instructions and part replacements for the Bentley 60 Chassis with a 3.750 bore cast iron engine. | 29th Nov 1938 | Box 123 \ 5 scan0191 | |
| Production instructions and component status updates for an engine intended for test bed purposes. | 29th Nov 1938 | Box 123 \ 5 scan0192 | |
| Blueprints for the Bentley 60 Chassis crankcase and bearings. | 29th Nov 1938 | Box 123 \ 5 scan0193 | |
| New plug for a sodium-cooled valve on a Bentley 60 Chassis to prevent leakage. | 29th Nov 1938 | Box 123 \ 5 scan0194 | |
| Specification for the build of four new I/C B.80 units, detailing crankcase, bearings, valves, and fittings. | 30th Nov 1938 | Box 123 \ 5 scan0195 | |
| Specification sheet detailing modifications for various engine components across multiple units. | 30th Nov 1938 | Box 123 \ 5 scan0196 | |
| Specifications and instructions for engine components including camshafts, crank dampers, and pistons for various units. | 30th Nov 1938 | Box 123 \ 5 scan0197 | |
| Urgent memo detailing the failure of B.60 bottom tappets during an endurance run and requesting modified replacements. | 1st Dec 1938 | Box 123 \ 5 scan0198 | |
| The initial testing of the B.60 cast iron engine, detailing performance curves, reliability, and crankshaft damper issues. | 1st Dec 1938 | Box 123 \ 5 scan0199 | |
| Note on the problem of the spring-driven crankshaft pinion on the Line 8 engine version. | 1st Dec 1938 | Box 123 \ 5 scan0200 | |
| Graph comparing the maximum power output of B.60 and B.III engines under open exhaust conditions with different camshafts. | 1st Dec 1938 | Box 123 \ 5 scan0201 | |
| Installing a B.60 cast iron engine into a Wraith for road testing before committing to parts production. | 1st Dec 1938 | Box 123 \ 5 scan0202 | |
| Status of various schemes for the B.60 engine installation in the W.111 chassis. | 28th Nov 1938 | Box 123 \ 5 scan0203 | |
| Instructions for assembling the B.60 No.1 unit for further endurance testing with specific new and modified parts. | 1st Dec 1938 | Box 123 \ 5 scan0204 | |
| Request for a detailed design of a machined aluminium water pump pulley to test and solve belt troubles. | 1st Dec 1938 | Box 123 \ 5 scan0205 | |
| Notification regarding new blueprints for strengthened tappets on Bentley 60 & 80 chassis. | 2nd Dec 1938 | Box 123 \ 5 scan0206 | |
| Analysis of a water pump seal and bearings for B.60 and B.80 engines after a 10,000-mile test. | 2nd Dec 1938 | Box 123 \ 5 scan0207 | |
| Request to produce two sheet metal brass bends for the B.60 Induction System. | 2nd Dec 1938 | Box 123 \ 5 scan0209 | |
| Requesting the preparation of a set of B.60 belt pulleys with specific material instructions. | 2nd Dec 1938 | Box 123 \ 5 scan0210 | |
| To hold production on B.60 and B.80 crankshafts and crankcases for modifications. | 2nd Dec 1938 | Box 123 \ 5 scan0211 | |
| Technical instruction regarding a modified Dynamo Fixing Stay for the Bentley 60 engine. | 3rd Dec 1938 | Box 123 \ 5 scan0212 | |
| Push rods to be shortened to fit Wraith type bottom tappets into a B.60 endurance engine. | 3rd Dec 1938 | Box 123 \ 5 scan0213 | |
| Details a modification to the Dynamo Fixing Stay for the Bentley 60 engine to improve its rigidity. | 3rd Dec 1938 | Box 123 \ 5 scan0214 | |
| Issues with water pump bearings and seals on B.60 & B.80 units and proposing a new Tufnol bearing design. | 5th Dec 1938 | Box 123 \ 5 scan0215 | |
| Design of a Wraith water pump, specifically the gland sealing washer. | 5th Dec 1938 | Box 123 \ 5 scan0216 | |
| Temporary modification for B.60 & B.80 crankshafts due to issues with the harmonic damper. | 6th Dec 1938 | Box 123 \ 5 scan0217 | |
| Modifications to the Bentley 60 water pump, dynamo, and front engine mounting. | 6th Dec 1938 | Box 123 \ 5 scan0218 | |
| Requesting modifications to the B.60 & B.80 Klingerit cylinder head joints. | 7th Dec 1938 | Box 123 \ 5 scan0219 | |
| Alterations to B.60 belt pulleys due to incorrectly manufactured 'Ferogrip' belts. | 7th Dec 1938 | Box 123 \ 5 scan0220 | |
| Table of pulley dimensions specifying piece number, correct vee angle, and correct top width. | 7th Dec 1938 | Box 123 \ 5 scan0221 | |
| Analysis of a valve gear failure on a B.60 unit and recommendations for design improvements. | 8th Dec 1938 | Box 123 \ 5 scan0222 | |
| New drawing for a water pump pulley which will replace a previous part. | 8th Dec 1938 | Box 123 \ 5 scan0223 | |
| Valve spring failures on B.60 and B.80 units and outlining temporary and trial replacements. | 8th Dec 1938 | Box 123 \ 5 scan0224 | |
| Designs for the exhaust system of a B.80 engine fitted into a Wraith 80 chassis, referencing Buick and Bentley parts. | 9th Dec 1938 | Box 123 \ 5 scan0225 | |
| Outlining designs for an exhaust system to fit a B.80 engine into a Wraith 80 chassis. | 9th Dec 1938 | Box 123 \ 5 scan0226 | |
| Modification for fixing Phantom III valve springs on B.60 Unit No.1. | 9th Dec 1938 | Box 123 \ 5 scan0227 | |
| Requesting the modification of a crank damper on a Bentley 60 unit for a trial. | 9th Dec 1938 | Box 123 \ 5 scan0228 | |
| Crankshaft torsional oscillation issues on the B.60 engine and proposing an experimental solution. | 10th Dec 1938 | Box 123 \ 5 scan0229 | |
| New steel tubular valve push rod with welded ends for B.60 and B.80 engines. | 12th Dec 1938 | Box 123 \ 5 scan0230 | |
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