NOTE
Valve sticking may also result from valve
stems which have been scored due to
Immediately after removing the fuel
foreign matter in the lubricating oil,
pipes, cover each injector opening
leakage of antifreeze (glycol) into the
with a shipping cap to prevent dirt
lubricating oil which forms a soft sticky
or other foreign matter from enter-
carbon and gums the valve stems, and
ing the injector.
bent or worn valve guides. Sticking
valves may eventually be struck by the
piston and become bent or broken.
4. Remove the two bolts holding the
rocker arm shaft brackets to the cylinder
It is highly important that injector timing
head. Then remove the brackets and
and valve clearance be accurate adjusted
shaft.
and checked periodically. Improperly
timed injectors or tightly adjusted valves
5. Remove the exhaust valve bridge.
will have adverse effects upon com-
bustion.
6. Remove the cylinder block air box
cover so that piston travel may be ob-
served, then turn the crankshaft until
R e m o v e Exhaust Valve Spring (Cylinder
the piston is at the top of its stroke.
H e a d Installed)
7. Thread the valve spring compressor
An
exhaust
valve
spring
may
be
adaptor J 7455-1 into one of the rocker
removed, without removing the cylinder
arm bracket bolt holes in the cylinder
head from the engine, as follows:
head (see Figure 11B-51 on page
11B-35). Then compress the valve
1. Clean and remove the valve rocker
spring and remove the two piece tapered
cover.
valve lock.
2. Crank the engine over to bring the
8. Release the tool and remove the valve
valve and injector rocker arms in line
spring cap, valve spring and spring
horizontally.
seat.
NOTE
R e m o v e Exhaust Valves and Valve
When
using
a
wrench
on
the
S p r i n g s (Cylinder Head Removed)
crankshaft bolt at the front of the
engine, do not turn the crankshaft
With the cylinder head removed from the
in a left hand direction of rotation
engine, remove the exhaust valve and
or the bolt may loosen.
s p r i n g s as follows:
1. Support the cylinder on 2" thick wood
3. Disconnect
and remove the
fuel
pipes
blocks to keep the cam followers clear of
from
the
injector
and
the
fuel
the bench.
connectors.
2. Remove the fuel pipes from the injec-
tors and the fuel connectors.
NOTE
Immediately after removing the fuel
pipes, cover each injector opening
with a shipping cap to prevent dirt
or other foreign matter from enter-
ing the injector.
3. Remove the two bolts holding the
rocker arm shaft brackets to the cylinder
head. Then remove the brackets and
shaft.
F i g u r e 11B-50. Assembly of Exhaust
V a l v e s and Guides
11B-34
