MCi Crusader II 1989 Maintenance Manual page 388

Date
1-1-89
Page ·_. __
1_2-_8 _ _
MC-9 MAINTENANCE MANUAL
Dial Indicator
!Minimum
lllfflp
0.200"1
0.085 ..
2.15mm
\ Val,,. As....,bly
I ll•tained
1
\ Horizontally
L r
"•31mm
t
0.170"
"A" 1 - "C" ""-
11,tok• Position-"'
f
bhoust Pomion
..... I.At .....
C.ntat Position
Figure 12-10. Locating Lever Center.
11. Divide the total travel di"}ension by two (example: 0.170"
divided by 2 equals 0.085"; (4.31 mm divided by 2 equals 2.15
mm) to the center (position B).
12. Important Without disturbing lever center position, reset
indicator dial to zero. which actually is 0.100" (2.54 mm) on
indicator of type registering 0.100" (2.54 mm) for each revolution
. of indicator needle. then proceed with valve lever gap adjust-
ments following.
AIR INTAKE AND EXHAUST VALVE LEVER ADJUSTMENT
Two methods of adjustment are availabre:
1. Using both air pressure and vacuum - If vacuum source
is available, this method .will take less time to perform. Vacuum
source is used to make the exhaust valve lever gap check only.
2. Using air pressure only - When this method is used, it will.
take longer to perform adjustments as the valve cover must be
in place each time air pressure is applied and then removed to
permit adjustment of exhaust valve lever.
Instructions covering lever adjustments are identical for
front and rear valves. Rear valve lever and front valve lever must
be bent to proper setting. In these valves both exhaust and
intake levers are part of one unit which contains "score" marks
to permit easy bending. Persons may ac~omplish this operation
with lever in the valve body, or lever may be removed and bent
on the bench. ·
NOTE: Before making these adjustment•
th• owertravel Jewer must be centered as
exptalned previously.
VACUUM METHOD
1. Apply available vacuum and regulate air pressure to ap-
proximately 95 psi (655
kPa).
2. Move overtravel lever fore and aft several times and then
back to center position.
3. Starting at center position. slowly move lever to where air
intake valve just begins to open. Listen for escaping air. Note
reading on dial at this point. Reading should be 0.025--0.027"
(.635-.685
mm) from lever center position. If necessary bend
intake valve lever to correct setting, refer to figure 12-11.
4. Return overtravel lever to center position. Slowly_ move
lever to exhaust side and at the same time note the vacuum
gauge reading. When vacuum just begins to fall. the exhaust
valve has opened. Valve should open when overtravel lever is
moved 0.035" to 0.037" (.889-.940 mm) from center position. If
necessary. bend exhaust valve lever to correct setting; refer to
Figure 12-11 .
AIR PRESSURE METHOD
This method may be performed when a vacuum source is not
available.
1. Apply air pressure regulated to approximately 95 psi (655
kPa) to air inlet port.
2. To adjust air intake valve lever gap, move the overtravel
lever slowly from center position to point where intake valve just
begins to open. Listen for escaping air: Note reading on dial at
this point which should register 0.025-0.027" (.635-.685 mm). If
necessary, bend intake valve lever to correct setting. Refer to
Figure 12-11.
CORE" .MARKS
BENDING
ff::!!'
_ • SCRI
LEVER
f:rom Center Position
.025•.027in INTAKE
.61S-.68Smm
.035·.037in EXHAUST
.689-. 9 39mm
Figure 12-11. Adjusting Air Intake Valve Lever Gap.