Onan JB - Specifications; Engine Specifications Table

SPEC IF ICAT IO NS
SPECIFICATIONS
Dimension in Inches
MANUAL STARTING ELECTRIC STARTING
JB JC JB JC
I
Height
Width
Length
Weight
Number of Cylinders
Displacement (cu. in.)
26-3/8 28-5/16
17-7/8
1 9-1 /2
24-518 37-1/2
220 375
2. 4
60 120
26
I 26
18
- 25
20
37
220
I 375
60
3-1/4
~ ~~
120
3-1 14
3-5/8
I 3-5/8
Bore
Stroke
H.P.
@ 2700 rpm
21.6
I 42.5
~~
3-1 /4 3-1/4
3-5/8 3-5/8
21.6 42.5
I Compression Ratio (Natural Gas Only 9:1 - Spec U & W) I 6.5:l I 6.5:l I 631 I 6.5:l
Connecting Rod Bearings Tri-metal, Replaceable
Main Bearings are Steel-backed, Bronze Sleeve Type;
Replaceable Precision Inserts
STD STD
2 3
STD
I STD
Battery ignition
**Breaker Points and Coil
*'Distributor and Coil
Magneto
*'Flywheel Type
2 13
ff
NA NA
NA NA
STD NA
Gear Driven
Battery Voltage
Combustion Air (CFM)
@ 2700 rpm
STD
I NA
NA STD
NA STD NA NA
12 12
12 12
48
96 48 96
NA
I NA
Inlet Vent
(sq. ft.)
*Outlet Vent
(sq. in.)
Air Cleaner
~ ~~
7 12
7 12
80 160
80
160
DRY DRY
DRY DRY
I 1'Coolinn Air (CFM) @ 2700 rDm I 850 I 1250 I 850 I 1250
Fuel Pump Lift (feet)
Oil Filter (Full Flow)
~~~~~~~ ~ ~~ ~ ~~
6 6 6 6
STD STD
STD STD
I Choke I Manual I Manual I Manual I Manual
Power Take-Off
Shaft Length (inches)
Shaft Diameter (inches)
4
4 4
4
1-314
1 -3/4 1 -3/4 1 -3/4
I "*Oil CaDacitv. Refill IUS Quarts) I 3 I 6 I 3 I 6
I<eyway Width
I Keyway Depth
3/8 3/8 3/8 318
3/16 3/16 3/16 3/16
I Kevwav Lenath I 3 I 3 I 3 I 3
- Area when duct is used; without duct, make vent as large as possible.
** - NA means not available.
Plus an additional 1/2 quart when replacing oil filter.
t - For Vacu-Flo cooling: JB-610 CFM @ 1800 RPM. JC-1600 @ 1800 RPM
ttt -
2
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