Mack B series

The Mack B series is a model line of trucks produced by Mack Trucks between 1953 and 1966.[1] The successor to the 1940-1956 Mack L series,[2] the B-series was a line of heavy conventional-cab trucks. Adopting a more streamlined appearance over its predecessor, the B-series was designed with a sloped windshield and larger, rounded fenders[1] The model line was sold in multiple configurations, including tractors and straight/rigid trucks, cowled chassis (delivery body or bus), or fire trucks.

Mack B-series
1961 Mack B-series fire truck
Overview
ManufacturerMack Trucks
Production1953-1966
Body and chassis
ClassTruck
Body styleTruck (bonneted cab)
Powertrain
Engine6.8 L Magnadyne I6 (112 kW) (petrol)
8.4 L I6 (103 kW) (diesel)
11.0 L Thermodyne I6 (139 kW) (diesel)
11.0 L Thermodyne I6 T (164 kW) (diesel)
11.6 L Thermodyne I6 (157 kW) (diesel)
14.0 L Cummins NTC I6 T (250 kW) (diesel)
14.2 L Thermodyne V8 (190 kW) (diesel)
TransmissionMack 10-speed duplex (5-speed, 2-speed auxiliary)
Mack 15-speed triplex (5-speed, 3-speed auxiliary)
Mack 20-speed quadruplex (5-speed, 4-speed auxiliary)
Chronology
PredecessorMack L-series
SuccessorMack R-series
B Model Mixer

The B-series was the first Mack truck produced with a diesel engine, introducing the Mack-produced Thermodyne inline-6 in 1953.[1]

During 1966, Mack replaced the B-series with the Mack R-series, which lasted into the 21st century.[3][4][5] In total, 126,745 examples of the B-series were produced over 13 years.[6]

Model numbers & letters

Chassis model designations:

  • B1x -
  • B2x -
  • B3x -
  • B4x -
  • B5x -
  • B6x -
  • B7x -
  • B8x -
  • B9x -

Chassis letter guide:

B - school bus chassis
C - flat face cowl for the addition of a delivery body
E - built for export
F - fire truck chassis
L - light weight or weight reduced by using aluminum components
P - platform chassis (single axle straight truck)
R - right hand drive. This designation was started in 1964 but right hand drive available
S - six wheel chassis (tandem axle)
T - tractor chassis
X - severe or extreme service chassis
Mack B81 (the heaviest duty range) dump truck

Engines

The B Model offered 10 different gasoline engines, from a 291 cu in (4.8 L) with 107 hp (80 kW) in the B20 to a 707 cu in (11.6 L) with 232 hp (173 kW) in the B70.

A wide range of diesels were also offered. From the B61 up to the ENDT 673 turbocharged I6 and END 864 V8 were offered. From the B73 up to the Cummins 855 cu in (14.0 L) I6s up to the NTC335 were available.

The table shows the largest gasoline and diesel engines in the series.

ModelEngineDisplacementTypeHorsepowerTorque
B20EN291291 cu in (4.8 L)G I6107 hp (80 kW) at 2800232 lbf⋅ft (315 N⋅m) at 1400
B30EN331331 cu in (5.4 L)G I6122 hp (91 kW) at 2800264 lbf⋅ft (358 N⋅m) at 1400
B4XEN414413 cu in (6.8 L)G V8214 hp (160 kW) at 4000
END673672 cu in (11.0 L)D I6
B53END673
B6XEN540540 cu in (8.8 L)G I6185 hp (138 kW) at 2400445 lbf⋅ft (603 N⋅m) at 1300
ENDT673672 cu in (11.0 L)TD I6
END864864 cu in (14.2 L)D V8
B7XEN707707 cu in (11.6 L)G I6205 hp (153 kW) at 2100615 lbf⋅ft (834 N⋅m) at 1200
NTC335855 cu in (14.0 L)TD I6335 hp (250 kW) at 2100
B8XEN707
NTC335

(Type: G=gasoline, D=diesel, TD=turbocharged diesel)[7]

See also

References
  1. Corporate History: 1950-1959 - Mack Trucks.com
  2. "Mack Trucks "YEARS"". www.macktruckshistoricalmuseum.org. Retrieved 2020-07-27.
  3. Corporate History: 1960-1969 - Mack Trucks.com
  4. "Mack Trucks "YEARS"". www.macktruckshistoricalmuseum.org. Retrieved 2020-07-27.
  5. Warth, Thomas E. (1998). Mack Trucks Photo Gallery. Iconografix. pp. 151–164, 164–165, 167–168, 170–177, 179–185, 188, 195, 197, 204–207. ISBN 1-882256-88-3.
  6. "Model Production Numbers (1905-2000)" (PDF). Mack Trucks Historical Museum. Retrieved July 27, 2020.
  7. Forier, Louis C., ed. (1973). Motor’s Truck & Diesel Repair Manual (26 ed.). Motor. pp. 1003–1004, 1107–1109, 1250. ISBN 0-910992-16-9.


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