forming the timing check. Then proceed
Since the camshaft and balance shaft
as follows:
gears each have the same number of
teeth as the crankshaft gear, they will
1. Clean and remove the valve rocker
turn at crankshaft speed. However, as
cover.
the blower drive gear has only about half
as many teeth as the camshaft or balance
2. Select any cylinder for the timing
shaft gear, it turns at approximately
check--it is suggested that a cylinder
twice the speed of the crankshaft.
adjacent to one of the valve rocker cover
bolt or stud holes be chosen since the
LUBRICATION.
The gear train is lubri-
stud or bolt may be used to mount a dial
cated by overflow oil from the camshaft
indicator.
and balance shaft pockets spilling into
A certain
the gear train compartment.
3. Remove the injector as outlined in
amount of oil also spills into the gear
S u b s e c t i o n 11C.
train compartment from the camshaft and
balance shaft end bearings and the idler
4. Carefully slide a rod, approximately
The blower drive gear
gear bearing.
12" long, through the injector tube until
bearing is lubricated through an external
the end of the rod rests on top of the pi-
pipe leading from the main cylinder block
ston.
oil gallery to the gear hub bearing sup-
port. The idler gear bearing is pressure
5. Place the throttle in the no-fuel posi-
lubricated by oil passages in the idler
tion. Then turn the crankshaft slowly in
gear hub which connect to the oil gallery
the direction of engine rotation.
stop
in the cylinder block.
when the rod reaches the end of its up-
ward travel.
Remove the rod and turn
the crankshaft, opposite the direction of
E n g i n e timing
rotation, between 1/16 and 1/8 of a turn.
The correct relationship be-
GENERAL.
6. Select a dial indicator with 0.001"
tween the crankshaft and camshaft must
graduations and with a spindle movement
be maintained to properly control fuel in-
of at least one inch.
Provide an exten-
jection, t h e o p e n i n g a n d c l o s i n g o f t h e
sion for the indicator spindle. The ex-
exhaust valves and engine balance.
tension must be long enough to contact
the piston just before it reaches the end
The crankshaft timing gear can be
Also select suit-
of its upward stroke.
mounted in only one position since one
mounting
attachments
able
for
the
The cam-
attaching bolt hole is offset.
indicator so that it can be mounted over
shaft gear can also be mounted in only
the injector tube in the cylinder head.
one position due to the location of the
keyway relative to the cams. Therefore,
7. Mount the indicator over the injector
when the engine is properly timed, the
The indicator mounting may be
tube.
timing marks on the various gears will
threaded into the rocker cover stud or
match as shown in Figure 11B-144 on
the tapped hole in the cylinder head.
page 11B-93.
Make sure that the indicator spindle is
free in the injector tube and IS free to
An engine which is out of time may result
travel at least one inch.
in pre-ignition, uneven running and a
l o s s of power.
8.
Attach
a
suitable
pointer
to
the
crankshaft front cover or engine front
When an engine is suspected of being out
end plate as shown in Figure 11B-145 on
of time due to an improperly assembled
page 11B-95. The pointer should extend
gear train, a quick check can be made
over the vibration damper.
without having to remove the flywheel
and flywheel housing by following the
9. Turn the crankshaft slowly in the di-
procedure outlined below.
rection of engine rotation until the indi-
hand
moving.
cator
Continue
stops
Access to the
CHECK ENGINE TIMING.
turning the crankshaft until the indica-
vibration damper or crankshaft pulley,
tor hand starts to move again.
to mark the top-dead-center position of
the selected piston, and to the front end
10. Reset the dial indicator to zero.
of the crankshaft or flywheel to turning
Turn the crankshaft until the indicator
the crankshaft is necessary when per-
r e a d i n g ' is 0.010".
11B-94
