Onan CCK Service Manual

Remove the bearing cap. Leave the flattened
Plastiaauge on the part to which it has adhered and
compare the widest point with the graduations on the
Plastigauge envelope to determine bearing
clearance.
CYLINDER BLOCK
Inspection:
1. M ake a thorough check for cracks. Minute cracks
may be detected by coating the suspected area
with a mixture of 25 percent kerosene and 75
percent light motor oil. Wipe the part dry and
immediately apply a coating of zinc oxide (white
lead) dissolved in wood alcohol. If cracks are
present the white coating will becomediscolored
at the defective area.
2. Inspect the cylinder bore for scoring. Check the
Welsh plugs for a tight, even fit and the fins for
breakage.
3. Check the cylinder bore for taper, out of round
and wear with a cylinder bore gauge, telescope
gauge or inside micrometer, Figure 73. These
measurements should be taken at four places—
two at the top and two at the bottom of piston ring
travel.
4. Referring to Figure 74, measure cylinder diameter
and record the readings as follows:
a. Measure reading A across top of cylinder
where greatest piston ring wear occurs.
b. Measure reading B across cylinder at bottom
of piston ring travel,
c. Measure reading C across top of cylinder
where greatest ring wear occurs.
d. Measure reading D across cylinder at bottom
of piston ring travel.
5. Compare reading A with reading B, then compare
reading C with reading D to determine cylinder
taper due to wear.
If taper exceeds 0.005 inch (0.127 mm), rebore
and hone cylinder to accommodate the next
oversize piston.
6. Reading A compared to C and reading B com¬
pared to D indicates whetherornotthe cylinder is
out of round.
If cylinder is out of round 0.002 inch (0.051 mm),
rebore and hone cylinders for next oversize
piston.
TOP END OF CYLINDER
RING
WEAR
AREA
FIGURE 74. CYLINDER BORE MEASUREMENT
*
FIGURE 73. METHODS OF CYLINDER BORE INSPECTION .
H

Onan CCK Specifications

General

Cylinders	2
Ignition System	Battery ignition
Fuel Type	Gasoline
Cooling System	Air-cooled
Fuel System	Carburetor
Starter	Electric
Governor	Mechanical
Max RPM	1800 RPM
Engine Type	4-cycle
Bore and Stroke	3.25 x 3.625 inches (82.55 x 92.08 mm)