Onan P216 User Manual

Valve Spring: Check valve springs for cracks, worn
ends, distortion, and tension. If spring ends are worn,
check valve spring retainer for wear. Check for spring
distortion by placing spring on a flat surface next to a
square. Measure height of spring and rotate it against
square edge to measure distortion. If distortion exceeds
0.06 inch (1.5 mm) replace spring. Check spring tension
at the installed height for both thevalve open and closed
position using an accurate valve spring tester. Replace
any valve spring that is weak, cracked, worn, or distorted.
Valve RofafomThe P216, P218, and P220 engines use
free-rotating intake and exhaust valves. While in the
open position, the valves must rotate freely.
The P224 engine uses positive type valve rotators on the
exhaust valves. When functioning properly, the valves
are rotated
a fraction of a turn each time they open.
While in the open position, the valves must rotate freely.
There is no easy way to determine if a valve rotator is
good or bad. Onan recommends that valve rotators be
replaced at each major overhaul or
if a build up of
carbon is noted on valve face and valve seat.
Valve Seats: Inspect valve seat inserts. If seats are
loose, cracked or severely pitted, new ones must be
installed. Remove valve seat inserts using a valve seat
removal tool.
If valve seat insert bores in cylinder block
are damaged or worn
so that a press fit cannot be
obtained when installing new standard size valve seat
inserts, the bores must be machined for an oversize
seat.
USE NEW VALVE SEAT TO
ADJUST PULLER DEPTH
PULLER JAWS
FIGURE 4. VALVE SEAT REMOVAL
Valve Seat Removal: Remove carbon and combustion
deposits from valve seat. Select proper puller size
determined by inside diameter of valve seat. On some
pullers use a new seat as a guide to adjust puller depth
(Figure
4). Puller jaws must expand into cylinder block
at the point where bottom
of valve seat insert rests on
cylinder block. Position puller on valve seat and tighten
hex nut. Clamp cylinder block to a solid bench. Attach
slide hammer to puller. Tighten hex nut between each
blow with the slide hammer.
VALVE SEAT
INSERT DRIVER
(USE PROPER TOOL)
CHECK THIS SURFACE
FOR
BURRS BEFORE
f INSERTING SEAT
M-1025
FIGURE 5. INSERTING NEW VALVE SEAT
Valve Seat Installation: After the old seat has been
removed, clean
out any carbon or metal burrs from the
seat insert recess. Use a valve seat insert driver and
hammer to install the insert (Figure
5). Drive the valve
seat insert in
so the insert enters the recess evenly.
Make certain that the valve seat insert rests solidly on
the bottom
of the recess all the way around its
circumference.
To assure a tight valve seat
fit and eliminate the danger
of seat loosening in the bore,valve seat must be staked.
Insert valve seat staker into valve seat or guide
in
cylinder block. Using a lead hammer, strike the staking
tool a sharp blow to wedge new valve seat securely in
place.
It will be necessary to refinish valve seat inserts
before installing valves.
C-1104
Y
10-4

Onan P216 Specifications

General

Cylinders	2
Cooling System	Air-cooled
Fuel Type	Gasoline
Power Output	16 hp
Ignition System	Electronic
Starting System	Electric
Engine Type	4-cycle, air-cooled
Oil Capacity	2 U.S. quarts (1.9 liters)