Nuffield 3/45
The Nuffield 3/45 is a tractor produced by Nuffield. It is equipped with a 173 ci 2.8 L engine. The listed engine power is Diesel (listed): 45 hp / 33.6 kW. Transmission: 10 forward and 2 reverse. Operating weight: 4460 lbs 2023 kg.
Engine Power
Diesel (listed): 45 hp / 33.6 kW
Fuel & Capacities
19.2 gal
72.7 L
Transmission
10 forward and 2 reverse
Operating Weight
4460 lbs
2023 kg
Overview
 | 1967 - 1969 |
|---|
Production | |
|---|---|
Manufacturer | Nuffield |
Built in Bathgate, Scotland | |
Nuffield 3/45 Engine | |
|---|---|
BMC 2.8L 3-cyl diesel | |
Fuel tank | 19.2 gal
72.7 L |
Engine details ...  | |
Nuffield 3/45 Transmission | |
|---|---|
10-speed gear | |
Transmission details ...  |
Nuffield 3/45 Power | |
|---|---|
Engine | 45 hp
33.6 kW |
PTO (claimed) | 39 hp
29.1 kW |
Mechanical | |
|---|---|
Two-wheel drive | |
Final drives | spur gear |
Steering | manual |
Steering | power OptOptional |
Mechanical disc brakes | |
Open operator station. | |
Tractor hitch | |
|---|---|
Rear Type | II/I |
Control | directional control and top-link draft sensing |
Power Take-off (PTO) | |
|---|---|
Rear PTO | transmission |
independent OptOptional | |
Rear PTO Type | 540 (1.375) |
Engine RPM | 540@1800 |
Dimensions & Tires | |
|---|---|
Wheelbase | 74.8 inches
189 cm |
Weight | 4460 lbs
2023 kg |
Front tire | 5.50-16 |
Rear tire | 11.00-28 |
Full dimensions and tires ...  | |
Belt Pulley | |
|---|---|
Diameter | 9 inches
22 cm |
Width | 6.5 inches
16 cm |
Speed | 3011 ft/min (low ratio)
917.75 meters/min |
3821 ft/min (high ratio)
1164.64 meters/min | |
References | |
|---|---|
 | |
BMC Nuffield 3/45 & 4/65 published in 1968 |
Engine
Engine Detail — 173 ci / 2.8 L Diesel
Manufacturer | BMC |
Fuel Type | Diesel |
Configuration | 3-cylinder, liquid-cooled |
Displacement | 173 ci
2.8 L |
Bore/Stroke | 3.975x4.724 inches
101 x 120 mm |
Power | 45 hp
33.6 kW |
Rated RPM | 2200 |
Firing order | 1-3-2 |
Starter volts | 12 |
Oil capacity | 9 qts
8.5 L |
Coolant capacity | 10.8 qts
10.2 L |
Transmission
Transmission — 10 forward and 2 reverse gear
Type | gear |
Gears | 10 forward and 2 reverse |
Clutch | 280mm dry disc |
Five gears, plus reverse, in two ranges. | |
With 11-28 rear tires. | |
 | |
Dimensions
Nuffield 3/45 Tires | |
|---|---|
Ag front | 5.50-16 |
Ag rear | 11.00-28 |
Ag front | 6.00-16 |
7.50-16 | |
Ag rear | 11.00-32 |
13.00-28 | |
Dimensions | |
|---|---|
Wheelbase | 74.8 inches
189 cm |
Length | 116.9 inches
296 cm |
Width | 67.7 inches
171 cm |
Height (hood) | 56.7 inches
144 cm |
Height (exhaust) | 82.7 inches
210 cm |
Operating weight | 4460 lbs
2023 kg |
Ground clearance | 19.1 inches
48 cm |
Clearance (front axle) | 16.1 inches
40 cm |
Clearance (drawbar) | 13.4 inches
34 cm |
Front tread | 52 to 76 inches
132 to 193 cm |
Rear tread | 52 to 80 inches
132 to 203 cm |
Photos
Nuffield 3/45 tractor.
Nuffield 3/45 tractor.
Recommended Implements & Sizing Guide
Engineering recommendations for Nuffield 3/45 based on its 45 HP power envelope and ASAE agricultural standards.
| Implement & Operation | Recommended Size | Workload Rating | Engineering Notes |
|---|---|---|---|
Moldboard PlowPrimary Tillage | 2 to 3 Bottom (14-16")2 - 3 铧 (35-40 cm) | Medium Duty | Standard utility farm tillage. |
Rotary Cutter / MowerMowing & Clearing | 6 ft (72 in)1.8 m | Medium Duty | Medium pasture clearing; rear slip-clutch recommended. |
Rotary TillerSeedbed Prep | 66 to 72 in165 - 180 cm | Medium Duty | Standard utility tiller; slip clutch protection required. |
Disc HarrowSecondary Tillage | 7 to 8 ft Tandem Disc2.1 - 2.4 m 对开双排耙 | Medium Duty | Field leveling and clod breaking behind plows. |
Hay BalerHay & Forage | Small Square Baler (14x18")小方捆打捆机 (36x46 cm) | Medium Duty | Classic 2-string baler for horse and small livestock hay. |
Sizing & Soil Condition NoteActual implement sizing varies depending on local soil conditions (heavy clay vs sandy loam), field slope, and operating speed. Heavy tillage implements may require front ballast weights and wheel weights.
Fluids, Capacities & Working Autonomy
Standard fluid requirements, service intervals, and continuous runtime estimates for Nuffield 3/45.
Estimated Continuous Field Runtime: 8.2 hrs
Approximately 8.2 hours of continuous field operation at ~75% rated power on a full tank (19.2 gal / 72.7 L).
Estimated 75% Load Fuel Burn~2.3 gal/hr (8.9 L/hr)
Engine Crankcase Oil
SAE 15W-40 (Heavy Duty Diesel)
Standard Spec: API CK-4 / CJ-4 Heavy Duty
Service Interval: 150 – 250 Hours
Transmission & Hydraulic System
UTTO (Universal Tractor Transmission Oil)
Standard Spec: ISO VG 46 / 68 (Wet Brake & Trans Compatible)
Service Interval: 600 – 1000 Hours
Engine Cooling System
50/50 Ethylene Glycol Pre-mix
Standard Spec: ASTM D6210 / Heavy-Duty OAT Antifreeze
Service Interval: 2 Years / 1500 Hours
Nuffield 3/45 Specification Unit Converter
Convert power, fluid capacities, and operating weights between metric and imperial standards for Nuffield 3/45.
Converted Equivalents:
Horsepower (HP)45 hp
Kilowatts (kW)33.6 kW
Metric Horsepower (PS / CV)45.6 PS
Direct Competitor Comparison
Compare Nuffield 3/45 against same-era industry alternatives in the same horsepower class.
Current Model
Nuffield
Nuffield 3/45
Engine Power:Diesel (listed): 45 hp / 33.6 kW
★ Baseline Reference
International HarvesterMarket Competitor
International Harvester 404
Engine Power:40.8
Production Years:1961 - 1968
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