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181 Results
181 Results 
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Used Ajax 6 1/2x8 EA-22 Natural Gas Engine
1 of 4
Used Ajax 6 1/2x8 EA-22 Natural Gas Engine

Used Ajax 6 1/2x8 EA-22 Pumpjack Engine with following features: • 22 HP • 350-650 RPM • 1 Cylinder, 4 stroke • 165 mm (6.5 in) Bore • 203 mm (8 in) Stroke • 4.34 L (265 in3) Displacement • Weight 2,900 lbs (dry weight, engine only) • Dims

Used Ajax 6 1/2x8 EA-22 Natural Gas Engine
1 of 4
  • 22 HP
  • 350-650 RPM
  • Stock No: 52645
22
350-650
Used Ajax 7 1/4x8 EA-30 Natural Gas Engine
1 of 7
Used Ajax 7 1/4x8 EA-30 Natural Gas Engine

Used Ajax 7 1/4x8 EA-30 Pumpjack Engine with following features: • 30 HP • 350-650 RPM • 1 Cylinder, 4 stroke • 184 mm (7.25 in) Bore • 203 mm (10 in) Stroke • 5.41 L (330 in3) Displacement • Weight 2,950 (dry weight, engine only) • Dims 72"Lx46"Wx36"H

Used Ajax 7 1/4x8 EA-30 Natural Gas Engine
1 of 7
  • 30 HP
  • 350-650 RPM
  • Stock No: 54493
30
350-650
Used Ajax 7 1/4x8 EA-30 Natural Gas Engine
1 of 6
Used Ajax 7 1/4x8 EA-30 Natural Gas Engine

Used Ajax 7 1/4x8 EA-30 Pumpjack Engine with following features: • 30 HP • 350-650 RPM • 1 Cylinder, 4 stroke • 184 mm (7.25 in) Bore • 203 mm (10 in) Stroke • 5.41 L (330 in3) Displacement • Weight 2,950 (dry weight, engine only) • Dims 72"Lx46"Wx55"H

Used Ajax 7 1/4x8 EA-30 Natural Gas Engine
1 of 6
  • 30 HP
  • 350-650 RPM
  • Stock No: 54494
30
350-650
Used Ajax 7 1/4x8 EA-30 Natural Gas Engine
1 of 4
Used Ajax 7 1/4x8 EA-30 Natural Gas Engine

Used Ajax 7 1/4x8 EA-30 Pumpjack Engine with following features: • 30 HP • 350-650 RPM • 1 Cylinder, 4 stroke • 184 mm (7.25 in) Bore • 203 mm (10 in) Stroke • 5.41 L (330 in3) Displacement • Weight 2,950 (dry weight, engine only) • Dims 72"Lx46"Wx55"H

Used Ajax 7 1/4x8 EA-30 Natural Gas Engine
1 of 4
  • 30 HP
  • 350-650 RPM
  • Stock No: 54495
30
350-650
Used Ajax 7 1/4x8 EA-30 Natural Gas Engine
1 of 4
Used Ajax 7 1/4x8 EA-30 Natural Gas Engine

Used Ajax 7 1/4x8 EA-30 Pumpjack Engine with following features: • 30 HP • 350-650 RPM • 1 Cylinder, 4 stroke • 184 mm (7.25 in) Bore • 203 mm (10 in) Stroke • 5.41 L (330 in3) Displacement • Weight 2,950 (dry weight, engine only) • Dims 72"Lx46"Wx36"H

Used Ajax 7 1/4x8 EA-30 Natural Gas Engine
1 of 4
  • 30 HP
  • 350-650 RPM
  • Stock No: 54498
30
350-650
Used Ajax 7 1/4x8 EA-30 Natural Gas Engine
1 of 6
Used Ajax 7 1/4x8 EA-30 Natural Gas Engine

Used Ajax 7 1/4x8 EA-30 Pumpjack Engine with following features: • 30 HP • 350-650 RPM • 1 Cylinder, 4 stroke • 184 mm (7.25 in) Bore • 203 mm (10 in) Stroke • 5.41 L (330 in3) Displacement • Weight 2,950 (dry weight, engine only) • Dims

Used Ajax 7 1/4x8 EA-30 Natural Gas Engine
1 of 6
  • 30 HP
  • 350-650 RPM
  • Stock No: 54499
30
350-650
Used Ajax 7 1/4x8 EA-30 Natural Gas Engine
1 of 7
Used Ajax 7 1/4x8 EA-30 Natural Gas Engine

Used Ajax 7 1/4x8 EA-30 Pumpjack Engine with following features: • 30 HP • 350-650 RPM • 1 Cylinder, 4 stroke • 184 mm (7.25 in) Bore • 203 mm (10 in) Stroke • 5.41 L (330 in3) Displacement • Weight 2,950 (dry weight, engine only) • Dims 72"Lx46"Wx36"H

Used Ajax 7 1/4x8 EA-30 Natural Gas Engine
1 of 7
  • 30 HP
  • 350-650 RPM
  • Stock No: 54501
30
350-650
Used Ajax 8 1/2x10 E-42 Natural Gas Engine
1 of 7
Used Ajax 8 1/2x10 E-42 Natural Gas Engine

Used Ajax 8 1/2x10 E-42 Pumpjack Engine with following features: • 42 HP • 300-525 RPM • 1 Cylinder, 4 stroke • 216 mm (8.5 in) Bore • 254 mm (10 in) Stroke • 9.29 L (567 in3) Displacement • Weight 4,320 lbs (dry weight, engine only) • Dims

Used Ajax 8 1/2x10 E-42 Natural Gas Engine
1 of 7
  • 42 HP
  • 300-525 RPM
  • Stock No: 54405
42
300-525
Used Ajax 6 1/2x8 EA-22 Natural Gas Engine
1 of 2
Used Ajax 6 1/2x8 EA-22 Natural Gas Engine

Used Ajax 6 1/2x8 EA-22 Pumpjack Engine cylinder with following features: • 22 HP • 350-650 RPM • 1 Cylinder, 4 stroke • 165 mm (6.5 in) Bore • 203 mm (8 in) Stroke • 4.34 L (265 in3) Displacement • Weight • Dims

Used Ajax 6 1/2x8 EA-22 Natural Gas Engine
1 of 2
  • 22 HP
  • 350-650 RPM
  • Stock No: 54190
22
350-650
Used Ajax 7 1/2x10 CMA Natural Gas Engine
1 of 2
Used Ajax 7 1/2x10 CMA Natural Gas Engine

Used Ajax 7 1/2x10 CMA Pumpjack Engine cylinder with following features: • 30HP • 300-525 RPM • 1 Cylinder, 4 stroke • 190.5 mm (7.5 in) Bore • 254 mm (10.0 in) Stroke • 7.2 L (442 in3) Displacement • Weight • Dims

Used Ajax 7 1/2x10 CMA Natural Gas Engine
1 of 2
  • 30 HP
  • 300-525 RPM
  • Stock No: 54192
30
300-525
Used Ajax 7 1/2x10 CMA Natural Gas Engine
1 of 2
Used Ajax 7 1/2x10 CMA Natural Gas Engine

Used Ajax 7 1/2x10 CMA Pumpjack Engine cylinder with following features: • 30HP • 300-525 RPM • 1 Cylinder, 4 stroke • 190.5 mm (7.5 in) Bore • 254 mm (10.0 in) Stroke • 7.2 L (442 in3) Displacement • Weight • Dims

Used Ajax 7 1/2x10 CMA Natural Gas Engine
1 of 2
  • 30 HP
  • 300-525 RPM
  • Stock No: 54186
30
300-525
Used Ajax 7 1/4x8 EA-30 Natural Gas Engine
1 of 2
Used Ajax 7 1/4x8 EA-30 Natural Gas Engine

Used Ajax 7 1/4x8 EA-30 Pumpjack Engine cylinder with following features: • 30 HP • 350-650 RPM • 1 Cylinder, 4 stroke • 184 mm (7.25 in) Bore • 203 mm (10 in) Stroke • 5.41 L (330 in3) Displacement • Weight • Dims

Used Ajax 7 1/4x8 EA-30 Natural Gas Engine
1 of 2
  • 30 HP
  • 350-650 RPM
  • Stock No: 54193
30
350-650
Used Ajax 7 1/4x8 EA-30 Natural Gas Engine
1 of 2
Used Ajax 7 1/4x8 EA-30 Natural Gas Engine

Used Ajax 7 1/4x8 EA-30 Pumpjack Engine cylinder with following features: • 30 HP • 350-650 RPM • 1 Cylinder, 4 stroke • 184 mm (7.25 in) Bore • 203 mm (10 in) Stroke • 5.41 L (330 in3) Displacement • Weight • Dims

Used Ajax 7 1/4x8 EA-30 Natural Gas Engine
1 of 2
  • 30 HP
  • 350-650 RPM
  • Stock No: 54194
30
350-650
Used Ajax DP-115 Natural Gas Engine
1 of 7
Used Ajax DP-115 Natural Gas Engine

13 1/4" x 16" cylinder for a DP-115

Used Ajax DP-115 Natural Gas Engine
1 of 7
  • 115 HP
  • 200-360 RPM
  • Stock No: 54191
115
200-360
Used Ajax DP-115 Natural Gas Engine
1 of 9
Used Ajax DP-115 Natural Gas Engine

13 1/4'' x 16'' cylinder for a DP-115

Used Ajax DP-115 Natural Gas Engine
1 of 9
  • 115 HP
  • 200-360 RPM
  • Stock No: 54185
115
200-360
Used Ajax DP-165 Natural Gas Engine
1 of 2
Used Ajax DP-165 Natural Gas Engine

15" x 16" cylinder for a DP-165, cylinder is a K-7201E

Used Ajax DP-165 Natural Gas Engine
1 of 2
  • 165 HP
  • Stock No: 54189
165
Used Ajax DP-60 Natural Gas Engine Bare Case
1 of 6
Used Ajax DP-60 Natural Gas Engine Bare Case

Ajax Bare Case

Used Ajax DP-60 Natural Gas Engine Bare Case
1 of 6
  • 60 HP
  • 200-475 RPM
  • Stock No: 54170
60
200-475
Used Ajax DP-115 Natural Gas Engine
1 of 3
Used Ajax DP-115 Natural Gas Engine

Used Ajax DP-115 Pumpjack engine with following features: • 115 HP • 200/360 RPM • 1 Cylinder • 336.55 mm (13.25 in) Bore • 406.4 mm (16.0 in) Stroke • 36.14 L (2206 in3) Displacement • Naturally Aspirated • Weight • Dims

Used Ajax DP-115 Natural Gas Engine
1 of 3
  • 115 HP
  • 200-360 RPM
  • Stock No: 54145
115
200-360
Used Ajax DP-300 Cylinder Natural Gas Engine
1 of 3
Used Ajax DP-300 Cylinder Natural Gas Engine

15 x 16 cylinder core

Used Ajax DP-300 Cylinder Natural Gas Engine
1 of 3
  • 300 HP
  • Stock No: 54082
300
Used Ajax 8 1/2x10 E-42 Natural Gas Engine
1 of 3
Used Ajax 8 1/2x10 E-42 Natural Gas Engine

Used Ajax 8 1/2x10 E-42 Pumpjack Engine with following features: • 42 HP • 300-525 RPM • 1 Cylinder, 4 stroke • 216 mm (8.5 in) Bore • 254 mm (10 in) Stroke • 9.29 L (567 in3) Displacement • Weight 4,320 lbs (dry weight, engine only) • Dims

Used Ajax 8 1/2x10 E-42 Natural Gas Engine
1 of 3
  • 42 HP
  • 300-525 RPM
  • Stock No: 54075
42
300-525

Power Zone offers a wide range of new, used and reconditioned engines including Diesel Engines, Natural Gas Engines, Gas Engines, Propane Engines, and Hit & Miss Engines, sometimes referred to as Putt & Putt Engines or Pumpjack Engines. We provide these engines from many different manufacturers including Caterpillar, MTU, Detroit, Cummins, John Deere Ajax and Arrow. We have engines for most applications including Portable Power Units, Heavy Machinery, Fluid Pumping, Air Compression and Backup Power for the municipal, manufacturing, oil & gas, mining and agriculture sectors.