Onan CCKA User Manual

Dimensions and Clearances
All clearances given at room temperature of 70°F (21 °C). All dimensions In Inches (approximate millimetre dimensions in
parentheses) unless otherwise specified.
DESCRIPTION MINIMUM MAXIMUM
CYLINDER BLOCK
Inches
(mm) Indies
(mm)
Cylinder Bore Honed Diameter...
Maximum Allowable
. 3.2490
(82.525)
3.2500
(82.550)
Taper.
0.005 (0.127)
Out-of-Round . 0.002 (0.051)
Main Bearing Inside Diameter {Without bearing)..
. 2.187
(55.55)
2.188
(55.58)
Main Bearing Inside Diameter CCK (Installed).
. 2.0020 (50.85)
2.0030
(50.88)
Main Bearing Inside Diameter CCKA/CCKB (Installed) .
. 2.0015 (50.84)
2.0040 (50.90)
Camshaft Bearing Bore (Bearing installed)....
CRANKSHAFT
. 1.3760
(34.95)
1.3770 (34,98)
Main Bearing Journal Diameter... . 1.9992
(50.78)
2.0000
(50.80)
Main Bearing Clearance. . 0.0025
(0.064)
0.0038 (0.097)
Connecting Rod Journal Diameter.
. 1.6252 (4138} 1.6260
(41.30)
Crankshaft End Play.
CONNECTING ROD
Large Bore Diameter (Without bearing installed
. 0.006 (0.152) 0.012 (0305)
and rod bolts property torqued] .... . 1.7505 (44.46) 1.7510 (44.48)
Connecting Rod Side Clearance......, . 0.0020 (0.051) 0.0160 (0.406)
Piston Pin Bushing Bore {Without bearing).
Piston Pin Bushing Bore with Bearing,
. 0.8115 (20.61) 0.8125 (20.64)
(Finished bore).
Bearing to Crankshaft Clearance
. 0.7504
(19.05) 0.7508 (19.07)
Nodular Iron Rod...
. 0.0005 (0.013) 0.0023
(0.058)
Aluminum Rod.
CAMSHAFT
...... 0.0020
(0.051) 0.0033 (0.084)
Bearing Journal Diameter. . 13740
{34.90}
13745
(34.91)
Bearing Clearance.
. 0.0015 (0J038) 0.0030 (0.076)
End Play.
...... 0.0030
(0.076) 0.0120 (0305)
Camshaft Lift.
PISTON
Clearance in Cylinder
0.300
(7.62)
Measure 90° to pin 0.10 inch below oil ring...
Clearance in Cylinder (CCKB with 112-0073 piston)
. 0.0025
(0.064)
0.0045
(0.114)
Measure 90° to pin 0.10 inch below oil ring..
. 0.0060 (0.150)
0.0080 (0300)
Piston Pin Bore.......
Ring Groove Width
. 0.7502 {19.055)
0.7506
(19.065)
Top 1 Compression Ring .
. 0.0960 {2.438) 0.0970
(2.464)
No. 2 Compression Ring..
. 0.0955 {2.426) 0.0965
(2.451)
No. 3 Oil Control Ring...
.. 0.188
(4.775)
0.189 (4.801)
4

Onan CCKA Specifications

General

Cylinders	2
Ignition System	Battery ignition
Engine Type	4-cycle
Bore	3.25 in (82.55 mm)
Power Output	Varies with model. e.g., 6.5 kW (CCK)
Horsepower	10 hp
Starter	Electric