Onan CCK Series User Manual

58
. MAINTENANCE AND REPAIR
breaker points. Touch one test prod to the breaker box terminal (to
which
the lead to the coil \ is connected), and touch the other test prod
to a good ground on the engine. Turn the crankshaft against rotation
(backwards) until the points close. Then slowly turn the crankshaft with
rotation. The lamp should go out just as the points break.
6. Reinstall the breaker box cover.
FLYWHEEL. - To remove the flywheel turn the flywheel mounting screw
outward about 2 turns. Use a screw driver behind the
flywheel to take up the crankshaft end play. Then strike a sharp end-
wise blow on the head of the capscrew with a heavy soft faced hammer
to loosen. A suitable puller (with claws or with bolts to agree with fly-
wheel) may be used to pull the flywheel.
Do not
drop the flywheel. A broken fin will destroy the balance.
A magneto flywheel which has lost its magnetism can be remagetized.
The spark should jump a 3/16 inch gap with ease as tested by holding
the spark plug wire away from a clean metal part of the engine while
cranking.
VALVE SERVICE. - Properly seated valves are essential to good en-
gine performance. The aluminum cylinder head
is removable for valve servicing. Do not use a pry to loosen the cy-
,linder head, rap sharply on the edge with a soft faced hammer, taking
care not to break any cooling fins. A conventional type valve spring .
lifter may be used when removing the valve spring locks, which are of
the sp'ttt type. Clean all carbon deposits from the cylinder head, piston
top, valves, guides, etc. If a valve face is burned or warped, or the
,stem worn, install a new valve.
Worn valve stem guides may be replaced from inside the valve chamber.
Valve locks are the split, tapered type, the smaller diameter of which
must face toward the valve head. Tappets are also replaceable from
the valve chamber,. after first removing the valve assemblies.
The valve FACE angle is 44
0
•
The valve SEAT angle is 45
0
•
This 1
0
interference angle results in a sharp seating surface between the valve
and the top of the valve seat. The interference angle method of grinding
valves minimizes face deposits and lengthens valve life .
.
The valves should not be hand lapped, if at all avoidable, since the sharp
contact may be destroyed. This is especially important where stellite
faced valves and seats are used. Valve faces should be finished in a
In.achine to
44
0
,
Valve seats should be ground with a 450 stone, and the
wldth
of the seat band should be 1/32 to 3/64 of an inch wide, Grind
i
[I illl
I1II IIII i
III

Onan CCK Series Specifications

General

Fuel Type	Gasoline
Fuel System	Carburetor
Frequency	60 Hz
RPM	1800 RPM
Starting System	Electric or Recoil
Starting Method	Electric or Recoil Start
Voltage	120/240V
Compression Ratio	6.5:1
Ignition System	Battery Ignition
Phase	Single-phase