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Bentley

Bentley 3.5 & 4.25 Derby Repair Maintenance Service Manual

Bentley 3.5 & 4.25 Derby Repair Maintenance Service Manual

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$16.99
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Vehicle data plateRef 197329
Brand
Bentley
Vehicle
Cars
Models covered
3.5 & 4.5 Litre, Derby
Format
PDF, searchable, print-ready
Delivery
Instant download after checkout
Language
English

What happens after you pay

  • Download link opens on the order page immediately
  • The same link is emailed to you β€” re-download any time
  • Open on phone, tablet or PC; print only the pages you need
  • Not sure it covers your model year? Ask us before you buy
🏷️ Basic Information
Identification
Make:
Bentley
Model:
Derby
Model Variant:
3.5 Litre & 4.25 Litre
Generation
Model Years Covered:
1933-1936 (for 3.5 Litre), 1936-1937 (for 4.25 Litre)
πŸ‘‹ Introduction
Market Position
Target Audience:
Bentley Derby owners, mechanics, restorers, and enthusiasts
Value Proposition:
Provides essential factory-authorized information for maintaining and repairing classic Bentley Derby models.
Restoration Focus:
Essential for owners undertaking period-correct restorations, ensuring accuracy in mechanical work.
Competitive Analysis
Uniqueness:
Factory service manual content, offering precise specifications and procedures unavailable in generic workshop manuals.
Key Features
Navigation Ease:
Fully bookmarked chapters and searchable text for efficient information retrieval.
Download Method:
Instant download, no waiting.
πŸ“‹ Manual Details
Coverage Areas
Manual Type:
Factory Repair and Maintenance Service Manual
Language:
English
Format:
PDF
Digital Features:
Searchable, Bookmarked, Indexed
Source Of Information:
Factory original documentation.
πŸ“– Manual Coverage
Systems Covered
Engine Systems:
Engine overhaul, tuning, lubrication, cooling system, ignition system
Drivetrain Systems:
Clutch, gearbox, rear axle and drive-shafts, front axle (rigid)
Chassis Systems:
Brakes, steering, springs and shock dampers, hubs
Electrical Systems:
Electrical and ignition system
Body And Chassis:
Front axle (rigid), Steering, Springs and shock dampers, Hubs
Procedures Included
Maintenance Procedures:
Regular maintenance, tune-ups, lubrication schedules, fluid specifications
Repair Procedures:
Detailed step-by-step repair instructions for all major mechanical components
Diagnostic Procedures:
Troubleshooting guidance based on symptoms
Special Tool Information:
Includes details on special tool kits required for specific repair procedures.
Technical Depth
Depth Of Information:
Comprehensive, from basic maintenance to detailed rebuild procedures
Illustrations And Diagrams:
Numerous pictures, diagrams, exploded views, and photos
πŸ“Š Manual Specifications
File Format
Digital File Type:
PDF
Print Capability:
Printable (entire manual or specific sections)
Compatibility:
All versions of Windows & Mac
Binding Type
Binding:
N/A (Digital PDF)
Paper Type
Paper Type:
N/A (Digital PDF)
Manual Completeness
Completeness Statement:
This is a comprehensive factory service manual covering all specified chapters, providing complete repair and maintenance coverage.
βš™οΈ Engine Specifications
Primary Engine
Engine Type 3.5 Litre:
Inline 6-cylinder, Overhead Valve (OHV)
Engine Displacement 3.5 Litre:
3669 cc (223.9 cu in)
Engine Bore 3.5 Litre:
82.55 mm (3.25 in)
Engine Stroke 3.5 Litre:
114.3 mm (4.50 in)
Engine Type 4.25 Litre:
Inline 6-cylinder, Overhead Valve (OHV)
Engine Displacement 4.25 Litre:
4267 cc (260.4 cu in)
Engine Bore 4.25 Litre:
88.9 mm (3.50 in)
Engine Stroke 4.25 Litre:
114.3 mm (4.50 in)
Compression Ratio 3.5 Litre:
Approximately 5.25:1 (refer to manual for exact variations).
Compression Ratio 4.25 Litre:
Approximately 5.25:1 (refer to manual for exact variations).
Performance
Horsepower 3.5 Litre:
Approx. 75-80 bhp (figures varied with tuning)
Horsepower 4.25 Litre:
Approx. 90-95 bhp (figures varied with tuning)
Fuel System
Fuel Delivery 3.5 Litre:
Single or Twin SU Carburettors (depending on specification)
Fuel Delivery 4.25 Litre:
Single or Twin SU Carburettors (depending on specification)
Lubrication
Oil Type Recommendation:
Specific viscosity grades as per manual (likely SAE 30 or 20W-50 for period, refer to manual for exact spec)
Oil Capacity 3.5 Litre:
Refer to manual (typically around 6-7 quarts/litres)
Oil Capacity 4.25 Litre:
Refer to manual (typically around 7-8 quarts/litres)
πŸ”§ Transmission
Standard Transmission
Gearbox Type:
Manual Transmission
Number Of Gears:
Typically 4-speed manual
Features
Gearbox Oil Specification:
Specific gear oil viscosity as per manual (e.g., SAE 90 Hypoid or GL-4 specification)
Clutch Type:
Single Dry Plate Clutch
πŸ“ Dimensions
Weights
Kerb Weight Approx:
1500-1700 kg (model and body style dependent)
πŸ”§ Maintenance
Service Intervals
Lubrication Schedule:
Regular chassis lubrication (grease points) and oil changes as specified in the manual (e.g., every 3,000-5,000 miles or annually).
Fluid Specifications
Brake Fluid Type:
Hydraulic fluid for Lockheed hydraulic systems (refer to manual for specific type, likely DOT 3 equivalent of the era or mineral oil if system was converted).
Coolant Specification:
Water with anti-corrosion additives (traditional practice).
Known Issues
Common Wear Items:
Gaskets (oil leaks), water pump seals, brake system components (cylinders, hoses), clutch components, electrical contacts.
Engine Maintenance Considerations:
Valve adjustments, ignition timing, carburetor synchronization, ensuring proper lubrication.
Technical Specs Required
Engine Timing Settings:
Specific ignition timing advance (BTDC) figures for different RPMs provided in manual.
Valve Clearances:
Specific cold valve clearance settings for intake and exhaust valves (in thousandths of an inch or mm).
Carburetor Jet Sizes:
Recommended jet sizes and needle profiles for SU carburetors for optimal tuning.
Spark Plug Gap:
Specified spark plug type and gap setting (e.g., 0.025 inches).
Wheel Alignment Specs:
Camber, caster, and toe-in specifications for front and rear axles.
Brake Adjustment:
Procedure and specifications for adjusting mechanical or hydraulic brakes.
πŸ“š Vehicle History
Brand Heritage
Brand Origin:
Founded in 1919 by Walter Owen Bentley.
Model Evolution
Derby Introduction:
The Derby was Bentley's first model under Rolls-Royce ownership, introduced after the financial difficulties of the original Bentley Motors.
Model Naming:
Named after the location of the Rolls-Royce factory where it was produced.
Engine Development:
The 4.25 Litre was an enlarged version of the 3.5 Litre engine, offering increased power and torque.
Production
Production Period 3.5 Litre:
1933-1936
Production Period 4.25 Litre:
1936-1937

Delivery & file format

This is a digital PDF download, not a printed book. After payment the download link appears on your order confirmation page and is emailed to the address you entered. Files open in any PDF reader on phone, tablet or computer and can be printed.

Check the model year and engine before you buy

Manufacturers change procedures, wiring and part numbers between model years and engine options. If your VIN plate shows a year or engine code that is not listed on the data plate above, contact us with the model, year and VIN and we will confirm coverage before you order.

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