Complete Detailed Ferguson TE-A20 TE-C20 TE-D20 TE-E20 TE-F20 TE-H20 Tractor Service Manual - Comprehensive Repair Procedures (1947-1956)

Ferguson TE Series Document Service Manual - 1946-1956 Edition

This lead technical service manual provides factory-specified diagnostic and repair protocols for the Ferguson System tractor range, focusing on the TE-A20 and TE-D20 base models. It includes high-precision tolerances for the Standard Motor Co. engines, specifically detailing the transition from 80mm to 85mm bores. For maximum operational uptime, technicians must utilize the reverse spiral groove on the upper oil pump drive shaft to prevent high-pressure oil leakage, a critical engineering feature that maintains lubrication system integrity under sustained load.

Engineering Architecture: Technical Applicability & Engine Variants

• Ferguson TE-A20 & TE-C20 (Petrol Engines): Covered for both early 80mm bore (1,850 cc) and late-edition 85mm bore (2,088 cc) configurations with compression ratios up to 6:1.
• Ferguson TE-D20 & TE-E20 (Vaporizing Oil Engines): Full specifications for 85mm bore variants, including specific carburetor jetting for Versions 1 through 4.
• Ferguson TE-F20 (Diesel Engines): Comprehensive technical depth for 17:1 compression ratio units, featuring barrel-mounted crankshafts and pre-combustion chamber maintenance.
• Ferguson TE-H20 (Lamp Oil Engines): Detailed operational parameters for low-compression 4.5:1 ratio engines as fitted to specialized chassis.
• Ferguson TE-20 & TE-C20 (Series Reference): Data for early narrow-width and standard chassis tractors powered by the 80mm Standard petrol engine.

Operational Performance: Factory-Authorized Service Proof Points

• System Calibration: Factory settings for Zenith 24T-2 carburetors including a 17mm choke tube and precise 15mm fuel level at 4'6" head pressure.
• Structural Torque Profiles: High-tensile requirements including 90-100 lbs. ft. for main bearing nuts and 75-80 lbs. ft. for TE-F20 diesel cylinder heads.
• Hydraulic Precision: Relief valve benchmarks and housing bore tolerances for the control valve bush maintained at 0.001" new clearance.

Document Management & Metadata

• Manufacturer: Harry Ferguson Ltd. / Standard Motor Co.
• Document Type: Comprehensive Technical Service Manual
• Serialization Coverage: Includes specific modifications after Serial No. 32,872 and engine No. SA.23083E.
• Format: Technical Schematics, Tolerance Tables, and Dismantling Procedures.

  Mechanical Depth & Factory Benchmarks

  Engine reconditioning requires strict adherence to the graded piston and sleeve system. Components are categorized into Grades F, G, and H in diameter increments of 0.0004" (0.010 mm) to ensure thermal expansion compatibility within the parallel sleeve bores. Crankshaft journals must be inspected for ovality and taper with a maximum wear limit of 0.002" (0.051 mm) before requiring a regrind to one of the four standard undersize steps (0.020" to 0.040").

Visual Navigation & Systems Schematics

• Lubrication Flow Maps: Cross-sectional diagrams illustrating the path from the wire mesh screen through the annular pump space to the safety relief valves.
• Valve Timing Geometry: Detailed degree-wheel illustrations for the 10° overlap settings, crucial for preventing piston-to-valve interference.
• Exploded Cooling Systems: Component mapping for bellows-type thermostats and the impellor-assisted convection circuit.

Service Manual Table of Contents

• Section B: Specifications and Technical Data (All Engine Types)
• Section C: Engine Overhaul (Petrol, V.O., and Diesel)
• Section D: Cooling System Maintenance and Thermostat Calibration
• Section G: Electrical Systems and Ignition Timing
• Section T: Special Type Tractors (Narrow-Width/Industrial)
• Section U: Specialized Service Tools and Dismantling Equipment

Operational Limits & Critical Specifications

• Cylinder Compression: Standard operating pressure of 90 to 100 lbs. per square inch at cranking speed.
• Fluid Capacities: Transmission casing (5 gallons), Engine Sump (12 pints), and Steering Box (5 pints).
• Maintenance Tolerances: Exhaust valve stem-to-guide clearance must be maintained between 0.003" and 0.005" to prevent thermal seizure.
• Lubricant Specifications: Reverse spiral groove lubrication for pump shafts and shellac-treated felt seals for rear bearing caps.

Does this manual provide specific data for both standard and specialized tractor chassis? Yes, the manual covers standard normal-width tractors as the primary reference but includes specialized specifications for narrow-width models and other variants in Section T under the title "Special Type Tractors."

What are the authorized torque settings for critical engine fasteners on the TE-A20 and TE-F20? Technical requirements vary by engine type: Cylinder Head Nuts require 60 to 65 lbs. ft. on petrol models and 75 to 80 lb. ft. on diesel units, while Main Bearing Nuts must be tightened to 90 to 100 lbs. ft. to meet factory standards.

Which engine versions and serial number ranges are specifically detailed for the Vaporizing Oil models? The manual identifies four distinct versions of the V.O. Engine, starting with versions 1 and 2 (Engine Nos. S120,510E to S170,173E) and continuing through versions 3 and 4 (Engine Nos. S170,174E onwards), each with unique compression ratios and belt horsepower ratings.

Are there specific maintenance intervals or diagnostic benchmarks for ensuring engine health? Decarbonization and valve grinding are recommended after the first 300 hours of service, while a healthy engine should produce a cylinder-head compression pressure of 90 to 100 lbs. per square inch at cranking speed.

Does this digital documentation include visual aids for complex tasks like timing or fuel system repairs? Is it possible to reference high-resolution schematics, such as Fig. 131 (Timing Mechanism) for aligning dots on the crankshaft and camshaft or Fig. 101 for tracing the diesel oil distribution path, ensuring precision during a major overhaul.