John Deere 318 Engine

John Deere 318 lawn tractor photo
1983 - 1992
300 Series
Garden tractor
Engines overview
18HP Onan 709cc 2-cyl gasoline
18HP Onan 781cc 2-cyl gasoline
Engine Detail
Onan B43G
2-cylinder 4-valve
air-cooled horizontal-shaft opposed twin
The Onan B43G was used from 1983 to 1987, ending with tractor serial number M00318X420000.
Displacement709 cc
43.3 ci
Bore/Stroke3.25x2.62 inches
83 x 67 mm
Power (gross)18 hp
13.4 kW
Air cleanerfoam and paper
Idle RPM1350-3450
Starter volts12
SparkplugJD AM38622
 Motorcraft AGRF32
Sparkplug gap0.025 inches
0.635 mm
Engine Oil
318 gasoline engine oil chart
Oil capacity1.75 qts
1.7 L
Engine Detail
Onan P218
air-cooled horizontal-shaft opposed twin
The Onan P218 was used in the John Deere 318 from 1987, beginning at serial number M00318X420001, through the end of production.
Displacement781 cc
47.7 ci
Bore/Stroke3.25x2.88 inches
83 x 73 mm
Power (gross)18 hp
13.4 kW
Idle RPM1350-3450
Starter volts12
SparkplugNGK BPR5EFS
 Champion RS14YC
Page information
Contact: Peter Easterlund
Updated on July 5, 2021
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