Measure valve seat contact width as follows:
Coat valve seat evenly with Pruss ian Blue
Install valve
into valve guide
Put
valve lapper
on
valve
Rotate valve while gently tapping valve contact
area against seat
Repeat until a continuous pattern
in
the Prussian
Blue
is
seen
Measure
valve seat contact width:
• Service limit: 0.035 to 0.043
in.
(0
.9 to
1.1
mm)
If measurement exceeds service limit, repair valve
seat. Refer to Valve Seat
Servicing
on
p.
149.
_---1
1. Valve lapper
004531
1. Valve seat contact area
004532
POWERHEAD
CYLINDER HEAD ASSEMBLY
Valve
Spring
Measure valve spring free length. If measurement
is
lower than service limit, replace valve spring.
• Standard: 1.280
in.
(32.
52
mm)
• Service limit: 1.276
in.
(32.40 mm)
004541
Measure valve spring tension. If measurement is
lower than service limit, replace valve spring.
• Standard: 19.8
Ibs.
(90
N)
for 1.12
in
. (28.5
mm) 7
• Service limit:
16
.8
Ibs.
(76
N)
for 1.12
in.
(28.5
mm)
'-'
I I
004542
Oil Seal
Inspect condition. If cracked, cut or damaged,
replace
oil seal.
147
E
o
U
Qj
)(
~
Qj
~
ii
E
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