CYLINDER
HEAD
AND
VALVES
Use pliers
to
remove the valve stem seals. Do not reuse the
stem seals.
CYLINDER
HEAD
INSPECTION
Before cleaning check the cylinder head for water leaks,
cracks and other possible damage.
Clean by completely removing the oil, scaling, carbon and
sealant. After flushing the oil passage, blow
air thru to ensure
that no portion
of
the oil passage is clogged.
To
check the cylinder head bottom surface for flatness and
distortion,
as
indicated in the diagram, use a straight edge
and a feeler gauge.
If
distortion exceeds the limit correct
by
grinding.
CYLINDER
HEAD
FLATNESS
Standard
O.020in
(O.05mm)
CYLINDER
HEAD
GRINDING
LIMIT
D.D79in
(D.2mm)
Limit
D.D79
(D.2mm)
Total
resurfacing
depth
of
cylinder
head
and
block
CYLINDER
HEAD
HEIGHT
(NEW)
4.287
-
4.295in
(1D8.9
-1D9.1mm)
A
CAUTION:
No
more
than
0.079in
(O.2mm)
of
stock
may
be
removed
from
the
cylinder
head
and
cylinder
block
mating
surfaces
in
total.
See the STANDARDS
AND
UMITS
CHART
for cylinder
head rework dimensions
of
the valve seat hole.
VALVE
ASSEMBLY
INSPECTION
Valve
StemNalve
Seat
If
the valve stem
is
bent or worn, replace the valve. Check
contact between the valve and valve seat by applying a thin
coat
of
Prussion Blue (or Redhead) on the valve seat contact
face, then insert the valve into the valve guide and press-fit
the valve on the valve seat. Do not rotate the valve.
Check
if
the valve seat contact face contacts the center posi-
tion
0f
the valve contact face.
If
it
is
not correct concentric,
correct the valve seat.
If
the margin
is
out
of
the limit, replace
the valve.
THICKNESS
OF
VALVE
HEAD
MARGIN
Standard
Intake
D.D39in
(1.Dmm)
Exhaust
D.D51in
(1.3mm)
Limit
D.D2Din
(D.5D8mm)
D.D31in
(D.787mm)
CONTACT
WITH
VALVE
SEAT
[to
be
at
cenler
of
seall
-
---r--
VALVE
HEAD
THICKNESS
[MARGIN]
VALVE
LENGTH:
Intake
3.6Din
(1DD.6mm)
Exhaust
3.968in
(100.8mm)
VALVE
SEAT
WIDTH
OF
CONTACT
Standard
D.D35in
-
D.051
(D.9
-1.3mm)
Valve
Spring
.L
VALVE
LENGTH
Measure the free height
of
the valve spring and replace the
spring
if
it is out
of
limit.
VALVE
SPRING
FREE
LENGTH
Standard
1.823in
(46.3mm)
____
Limit
1.783in
(45.3
mm)
Also check the spring for squareness and
if
it exceeds the
limit replace the spring.
VALVE
SPRING
SQUARE
NESS
Standard
less
than
2°
______
Limit
4°
Refer to the StandardslLimits chart for additional
./,
11
1
____
"",0-=···
~
TESTING
SQUARENESS/ANGLE
Engines & Generators
16
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