Target Audience:
Farm machinery mechanics, agricultural equipment repair specialists, owners of Case David Brown tractors and equipment
Value Proposition:
Provides essential, detailed technical information to maintain and repair valuable agricultural machinery, reducing reliance on costly dealer services.
Comprehensiveness:
Covers all aspects of the AD4 25 and CAD4 30 diesel engines for effective workshop service.
Detail Level:
In-depth, highly detailed information crucial for accurate diagnostics and repairs.
Primary Coverage:
Case David Brown AD4 25 and CAD4 30 Series Diesel Engines
Secondary Coverage:
Maintenance, Troubleshooting, Repair, and Overhaul Procedures
Estimated Page Count:
Extensive (Exact count not specified, but implied to be comprehensive for workshop service)
Type:
Workshop Service & Repair Manual
Language:
English (Implied by standard industry practice for such manuals)
Engine Mechanical:
Cylinder head, block, pistons, connecting rods, crankshaft, camshaft, valve train, timing gears/belts, lubrication system, cooling system
Fuel System:
Fuel injection pump, injectors, fuel lines, filters, governors
Lubrication System:
Oil pump, oil filter, oil passages, oil pressure regulation
Cooling System:
Water pump, radiator, thermostat, coolant passages, fan drive
Starting System:
Starter motor, engagement mechanisms
Exhaust System:
Exhaust manifold, exhaust pipes, mufflers
Air Intake System:
Air cleaner, intake manifold, turbocharger (if applicable)
Disassembly Assembly:
Complete engine disassembly and reassembly procedures with torque specifications
Maintenance:
Routine checks, fluid changes, filter replacements, belt adjustments
Troubleshooting:
Diagnostic charts, common fault identification, and corrective actions
Rebuilding Overhauling:
Engine overhaul procedures, component replacement, clearance measurements
Component Testing:
Testing of fuel injectors, fuel pump, lubrication system components
Depth:
Comprehensive (Suitable for professional mechanics and skilled DIY users)
Diagnostic Capability:
Advanced diagnostic procedures for engine performance issues
Repair Scope:
From minor adjustments to complete engine rebuilds
Engine Type:
Four-cylinder, naturally aspirated or turbocharged diesel engine
Bore:
Typically around 91.5 mm (3.60 inches) - based on common configurations for this era
Stroke:
Typically around 102 mm (4.02 inches) - based on common configurations for this era
Displacement:
Approximately 2.6 to 2.8 liters (159 to 171 cubic inches) - based on common configurations
Compression Ratio:
Typically in the range of 16.5:1 to 17.5:1
Horsepower Ad4 25:
Approx. 45-55 HP (Varies by application and tuning)
Horsepower Cad4 30:
Approx. 50-65 HP (Varies by application and tuning, likely a slightly higher output variant)
Torque:
Specific torque figures vary significantly by application, but generally strong low-end torque is characteristic.
Injection Type:
Direct injection or indirect injection (depending on specific model variant)
Fuel Pump:
Bosch or CAV rotary or inline injection pumps commonly used
Fuel Filter Type:
Cartridge type, spin-on
Transmission Type:
Manual gearbox (typically constant mesh, multi-speed)
Transmission Options:
Some models might feature a synchronized gearbox or power take-off (PTO) options.
Gear Selection:
Direct shift, often with a transfer case or range splitter for increased gear options
Safety Standards:
Industrial and agricultural vehicle safety standards of the era
Active Safety:
Reliable braking systems (typically drum or disc), steering systems. Manual emphasizes proper operation for safety.
Passive Safety:
Operator protection based on vehicle frame and guarding, as per agricultural safety norms.
Infotainment Systems:
N/A (Designed for agricultural machinery, no infotainment systems in the modern sense)
Driver Assistance Features:
N/A (Focus on mechanical reliability and operator control)
Connectivity Options:
N/A (Purely mechanical and functional)
Oil Change Interval:
Typically 250-500 hours, depending on operating conditions and oil type specified.
Fuel Filter Replacement:
Recommended every 250-500 hours or as needed if fuel quality is suspect.
Air Filter Cleaning Replacement:
Inspect regularly, clean or replace as needed based on operating environment (dusty conditions require more frequent checks).
Coolant Change Interval:
Typically every 1-2 years or 1000-2000 hours, using appropriate coolant.
Engine Oil Grade:
API CD or CE classification, SAE 30 or 15W-40 (depending on climate and manufacturer recommendation)
Engine Oil Capacity:
Approximately 7-9 liters (7.4-9.5 US quarts), depending on specific engine configuration.
Coolant Type:
Ethylene glycol based antifreeze with corrosion inhibitors (e.g., green or yellow coolant)
Common Problems:
Wear on valve seats, injector pump timing issues, potential overheating if cooling system is neglected, starter motor solenoid failure, exhaust manifold cracks.
Preventative Measures:
Regular maintenance, diligent checking of coolant levels, oil quality, and injection timing can prevent many common issues.
Manufacturer:
David Brown Tractors Ltd., later part of Case IH.
Engine Series:
The AD4 series engines were a cornerstone of David Brown's smaller to medium-sized tractor offerings from the late 1960s through the 1970s.
Engine Design:
Known for their robust construction and reliability, these engines powered popular models like the David Brown 770, 780, 880, 885, and 990 series tractors.
Production Period:
Mid-1960s to late 1970s
Manufacturing Location:
Meltham, Yorkshire, UK (David Brown's primary manufacturing facility)
