c. Cleaning, Inspection, Testing and Repair.
is 16 ounces.
spection, testing, and repair. The proper mini-
mum brush spring tension for 24-volt generator
ENGINE VALVES, VALVE GUIDES, AND SEAT INSERTS
Note. The intake valve and the exhaust
valve are stellitetype valves; each is
The valve system of this engine consists of
equipped with a valve rotator. Be sum to
one intake and one exhaust valve. Both valves
identify the valves as they are removed,
because each valve must be reinstalled in
are spring-loaded and equipped with rotators
the same valve guide from which it was
valves are accessible by removing the cylinder
b. Cleaning, Inspection, and Repair.
head and valve chamber cover. Both valves op-
(1) Scrape and/or wire brush carbon from
erate in valve guides pressed into the engine
the head and stem of the valves and
block. The valves and valve seat inserts are
from the inside of the installed valve
made of stellite resist burning. The function of
the intake valve is to admit the fuel air mixture
(2) Remove varnish from the valve stems.
Carefully clean all carbon from the in-
valve. controls the release of the exhaust gases
stalled valve seat inserts (2) with a
fine wire brush.
2 8 0 5 - 2 0 3 - 1 4 for data applicable to model
(3) Inspect the valves for evidence of im-
perfect seating, warpage, burning, or
wear and also inspect the valve face
4-25. Valves, Valve Guides, and Valve
for pits and grooves. Inspect the ends
of the valve stems for grooves or
sco9res. Reface slightly worn or dam-
aged valves (f below).
(4) A f t e r cleaning with an approved
(2) Remove the valve chamber access cov-
cleaning solvent, inspect the valve
springs, retainer locks, and valve ro-
tators for wear or signs of metal fail-
compress the valve spring (22, fig. 4-
ure. Inspect the compression springs
6). See that
is properly seat-
for pressure and squareness. See that
ed and located; then remove the two
the valve rotators turn freely.
spring retainer locks (20) from the
(5) Inspect the valve stem clearance of
recess in the stem of the valve (1).
e a c h valve in its respective valve
guide. If the valve stem-to-guide clear-
and lift the valve (1) out through the
ance is excessive, either the valve
stem or the valve guide is worn. Re-
place a valve guide having an inside
(5) Remove the valve rotator (21) and
diameter which measures in excess of
0.3130 inch (c below). Maximum al-
valve spring (22) from the valve
lowable wear for the valves and valve
guides is 0.002 inch.
(6) Remove the other valve and related
(6) M e a s u r e the valve stem diameter.
components in a manner similar to
They should be replaced if the stem
t h a t described in (3) through (5)
diameter is less than 0.3080 inch.