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© Another syinptom ol 2 fatigued spring is
insufficient spring pressure when com-
pressed. This can be checked using a
valve spring compression "ate gauge
Test each soring individur ly. Place it in
'cho gauge and comp-wes the spring first
«wo the specified compressed length with
'the valve closed (all spring spec!
sions van by fourd in pievious section,
Valve Sprig) then to the length with
the vo ve agen, Note tne poundage
Uicatwd on the scale at each secting
Use this procecure on the outer springs,
then no inner springs
NOTE;
All valve springs must be installed with
larger pitch upward a8 show below,
3. Valve eakage check
After ail work has been performed on
the valve and valve seat, ard all head
parts have been assembled, cneck for
proper vave/valve seat sealing by
pouring solvent into each of the ntake
pors, thon the exnaust ports. There
should be no leakace by the seat. If this
an
fluid leexs, disassemble and continue 10
lap with fine tapping compound. Clean
all patts thoroughly, reassemble and
chec« again with solvent. Ropoat this
procedure as v'ten as necessary to ob-
tain a satisfactory seal
4. Velve stem seal
This seal slips down over the valve stem
to prevent excessive amounts of oil
from passing down stem and inte the
combustion chamer
if this seal is
cracked, split, of hardened. ropiaca it.
5. Valve guide
2 If the valve guide inside diameter is be
yond servicesbie |imits, replace witn an
cversize valve cuice:
Sioned
Ti
700-1 o¥Em
107756 - ~ 02781 in
yabmn
278m)
b. To ease guide removal and reinstalls-
tion, and 7a maintain the correct inter-
forence fit, heat the head to 100°C
(212°F1
IF possible, use an oven to avoid any
possibility of head warpage dus te un-
ever heating
© Lise the appropriate shouldered drive
{special
tool! te dive the cle quide out
and the new guide in
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