Allis Chalmers B Overview
The Allis Chalmers B tractor was produced 1938–1957 as a compact general‑purpose machine for mid‑century farms.
Manufactured at West Allis, Wisconsin, the Model B evolved through engine updates and serial configurations that affect how a given tractor is configured for parts and service.
Nebraska Tractor Test Report Test 439 provides validated data on performance, and reproduced operator manuals, parts catalogs, and test documents give practical context for controls, lubrication, and parts matching. Before ordering parts or performing service, verify the tractor's serial range and configuration against the available manuals and documents.
Allis Chalmers B Quick Answers
- Production yearsThe Allis Chalmers B was produced from 1938 through 1957.
- Engine optionsEngine choices include 125.2 ci (2.1 L) and 116.1 ci (1.9 L) gasoline units.
- PTO and hitchRear PTO is 560.
- Service capacitiesEngine oil capacity is 4 qts (3.8 L); coolant capacity is 8 qts (7.6 L).
- WeightWeight is 2060 lbs (934 kg).
Engine and Power
Engine options include 125.2 ci (2.1 L) gasoline and 116.1 ci (1.9 L) gasoline, reflecting mid-century evolution; both are liquid-cooled four-cylinder units.
Gasoline engine
Allis-Chalmers CE / gasoline / 4-cylinder / liquid-cooled / Final engine, used from 1943 on, SN 64501
| Displacement | 125.2 ci 2.1 L |
|---|---|
| Bore Stroke | 3.375x3.50 inches 86 x 89 mm |
| Air Cleaner | oil bath |
| Compression | 5.75:1 |
| Rated Rpm | 1500 |
| Firing Order | 1-2-4-3 |
| Starter Volts | 6 |
| Engine Oil Capacity | 4 qts 3.8 L |
| Sparkplug | Autolite AN 7 |
| Sparkplug Gap | 0.035 inches 0.889 mm |
| Point Gap | 0.020 inches 0.508 mm |
| Intake Valve Clearance | 0.010 inches (hot) 0.254 mm |
| Exhaust Valve Clearance | 0.010 inches (hot) 0.254 mm |
Gasoline engine
Allis-Chalmers BE / gasoline / 4-cylinder / liquid-cooled vertical I-head / Second engine, used until 1943, SN 64500
| Displacement | 116.1 ci 1.9 L |
|---|---|
| Bore Stroke | 3.25x3.50 inches 83 x 89 mm |
| Compression | 4.92:1 |
| Rated Rpm | 1400 |
| Firing Order | 1-2-4-3 |
| Coolant Capacity | 8 qts 7.6 L |
| Sparkplug Gap | 0.040 inches 1.016 mm |
| Point Gap | 0.020 inches 0.508 mm |
| Intake Valve Clearance | 0.010 inches (hot) 0.254 mm |
| Exhaust Valve Clearance | 0.010 inches (hot) 0.254 mm |
Gasoline engine
Waukesha / gasoline / 4-cylinder / liquid-cooled / Original engine, used in 1937 on the first 96 tractors built
| Displacement | 113 ci 1.9 L |
|---|---|
| Bore Stroke | 3.00x4.00 inches 76 x 102 mm |
| Rated Rpm | 1400 |
Manufacturer
Manufacture years
Tested drawbar
PTO and Hitch
Rear PTO is 560; match implement requirements to PTO speed, hitch category, and the tractor’s actual equipment when planning work.
Rear PTO
Rear PTO type
Fluids, Battery, and Service Facts
Maintenance notes cover capacities and basic service data: engine oil 4 qts (3.8 L); coolant 8 qts (7.6 L); battery 6V; spark plug gaps at 0.035 in (0.889 mm) and 0.040 in (1.016 mm); point gap 0.020 in (0.508 mm); valve clearances 0.010 in (hot) for intake and exhaust. Cross-reference fluids, filters, belts, and specific parts with catalogs or manuals before ordering.
Fuel tank
Battery volts
Tires and Dimensions
Tire and dimension values can vary by wheel, axle, and configuration.
Configuration-specific values are split out where the same model has documented differences by engine, transmission, or equipment.
Wheelbase
Weight
Length
Width
- 5.5 inches 13 cm
- 52.7 inches (minimum) 133 cm
Front tire
Rear tire
Ag front
Ag rear
- 9-24
- 10-24
Electrical
Electrical rows are included when documented.
Ground
Charging system
Charging amps
Battery volts
Serial Number Lookup
Serial rows help narrow the Allis Chalmers B by model year. Factory prefixes, regional builds, and serial breaks require supporting documentation before applying a year table beyond the stated range.
Configuration-specific values are split out where the same model has documented differences by engine, transmission, or equipment.
1938
1939
1940
1941
1942
1943
1944
1945
1946
- 72265
- 1001 (IB)
1947
- 73370
- 1003 (IB)
1948
- 80556
- 1010 (IB)
1949
- 92295
- 1282 (IB)
1950
- 102393
- 1556 (IB)
1951
- 114527
- 1879 (IB)
- 4001 (EB)
1952
- 118674
- 2219 (IB)
- 6861 (EB)
1953
- 122310
- 2570 (IB)
- 9200 (EB)
1954
- 124201
- 11120 (EB)
1955
1956
1957
final
Manuals and Documents
The documents below add manual, parts, and test context for the Allis Chalmers B. They are useful for controls, service categories, parts matching, and tested-performance details that do not fit into short spec rows.
Match coverage carefully before relying on a document for service decisions, especially when one manual, catalog, or report covers several models, fuel types, transmissions, or tractor variants.
- Operator's Manual for Allis Chalmers Model BDigitally enhanced reproduction of original operator manual; SN# 5756-127461; 40 pages.Open source
- Allis Chalmers Model B Tractor Operator's Manual (SN 5756-127461)Operator's manual for Allis-Chalmers Model B; SN range 5756-127461; reproduced.Open source
- Allis Chalmers B Parts ManualAllis-Chalmers Model B parts manual; 191 pages; exploded views; reprint of original factory manual.Open source
- Parts Manual for Allis Chalmers models B, C, IB Tractors (AC1033)Parts manual for Allis-Chalmers B, C, IB tractors; includes B-125 Power Unit.Open source
- Test 439: Allis-Chalmers BNebraska Tractor Test Report for Allis-Chalmers Model B; includes identification and test data.Open source
Parts Checks Before Ordering
Do not order Allis Chalmers B parts from the model name alone. Match the part to the tractor's model code, serial range, engine, transmission, and PTO setup.
Filters, fluids, belts, electrical parts, clutch and PTO parts, and hydraulic parts can vary by setup. Exact part numbers require catalogs, manuals, or trusted supplier sources before they become recommendations.
Accuracy Note
Tractor specifications can vary by year, region, factory configuration, installed equipment, and later repairs. Match serial range, engine, transmission, PTO setup, and model code before ordering parts or doing service work.