Onan CCK Service Manual

FIGURE 75. HONING CYLINDER
HONING PROCEDURE
1. A hone can be used to rebore a cylinder. Figure
75. Remove stock to 0.002 inch (0.051 mm) less
than finished bore with coarse hone (100 grit),
then complete honing with finish hones (300grit),
2. Anchor block sol idly for either vertical or horizon¬
tal honing. Use either a drill press or heavy-duty
drill which operates at about 250 to 450 rpm.
3. Lower hone into cylinder until it protrudes 1/2to
3/4 inch (13 to 19 mm) past end of cylinder.
Rotate adjusting nut until stones come in contact
with cylinder wail at narrowest point.
4. Loosen adjusting nut until hone can be turned by
hand.
5. Connect drill to hone and start drill. Move hone up
and down in the cylinder about 40 cycles per
minute. Usually the bottom of the cylinder must
be worked out first because it is smaller. When
cylinder takes a uniform diameter, move hone up
and down all the way through the bore. Follow the
hone manufacturer's recommendationsforwetor
dry honing and oiling the hone.
6. Check diameter of cylinder regularly during hon¬
ing. A dial bore gauge is the easiest method but a
telescoping gauge can be used. Check the size at
six places in the bore; measure twice at the top,
middle and bottom of 90-degree angles.
7. When the cylinder is about 0.002 inch (0.051 mm)
within the desired bore, change to fine stones and
finish the bore. The finish should not be smooth
but as shown in Figure 76. The crosshatch formed
by the scratching of the stones should form an
angle of 23 degrees. This can be achieved by
moving the hone up and down in the cylinder
about 40 cycles per minute.
8. Clean cylinder block thoroughly with soap, water
and clean rags. A clean white rag should not be
soiled on the wall after cleaning is complete.
I^^AUTtorS I Do noi use a so,veni or gasoline
_i since they wash the oil from the
waits but leave the metal particles.
9. Dry crankcase and coat it with oil.
AVOID THIS FINISH
PRODUCE CROSS HATCH SCRATCHES
FOR FAST RING SEATING
FIGURE 76. CORRECT HONE FINISH

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)