CYLINDER
HEADS
Remove
the cylinder heads for lead cleaning and gasket
change at least
every
200
hours,
or
when
poor engine
performance is noticed. For engines running on un-
leaded fuel this interval may be extended to
400
hours.
1. Use a 112 inch (13 mm) socket wrench to remove
6
cylinder head
bolts.
Lift
heads
off.
4
2.
3.
4.
j
Torquing or removing cylinder
ACAUT'oN
heads when hot (above
700°F
137"
C])
will result in head damage. Allow heads to
cool
to
below
100°F
(37°C)
before
torquing
or
removing.
After removing heads, clean out all carbon deposits.
Be careful not to damage the outer sealing edges
where gasketsfit.The headsare made ofaluminum
and can be damaged by careless handling.
Use new head gaskets and clean both the heads
and the cylinder block thoroughly where the head
gaskets rest.
Place a head gasket on the cylinder blockand align
the holes in the gasket with the holes in thecylinder
block. While holding the gasket against the cylinder
head, carefully install the cylinder head on the
engine.
Do
not attempt to slide the head bolts
through thegasket without thecylinder block behind
it or the gasket may tear.
NO.
1
CYLINDER
NO.
2
CYLINDER
c-1002
FIGURE
28.
CYLINDER HEAD TORQUE SEQUENCE
5.
Follow the head torque sequence shown
in
Figure
28.
A.
B.
Graphoil head gasket torque procedure:
Tightenall boltsto5 ft-lbs(7 Nm),then
10
ft-lbs
(1
4
Nm), then
to
the torque specified in
ASSEM-
BLY TORQUES.
Recheck all head bolts for
correct torque.
Asbestos head gasket torque procedure:
Tighten all boltsto
5
ft-lbs
(7
Nm), then
10
ft-lbs
(1
4
Nm), then to the torque specified in
ASSEM-
BLY TORQUES.
Recheck all head
bolts
for
correct torque.
ALIGNING BLOWER WHEEL,
VENTURI
AND CHAFF SCREEN
It
may be difficult to line up the screw holes in the blower
housing chaff screen with those in theventuri and those
in the blower wheel if these parts are separated without
noting their relative positions. The holes will match
up
if
the parts are aligned as shown in Figure 29.
cs-1WI
FIGURE
29.
BLOWER WHEEL, VENTURI AND
CHAFF SCREEN ALIGNMENT
10-1
7
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