SINGLE-CYLINDER ENGINES
2. Check the cylinder head for signs
of
oil or water leak-
age b
ef
ore cleaning. Look for corrosion or foreign mate-
rial in the oil and water passages.
3. Without removing the valves, remove all depo sits from
the combustion chamber. Use a fine wire brush dipped in
solvent or make a scraper from hardwood. Be carefu l not
to scratch or gouge the combustion chamber.
4. After all carbon is removed from the combustion
chamber and ports, clean the entire head in solvent. Look
for cracks or other visible signs of damage. Clean the pas-
75
Feeler
gauge
sages with a stiffspiral brush, then blow the particles out
with compressed air.
NOTE
If
deposits are
found
in the intake or exhaust
port
, remove the valves
and
clean the
por
ts.
5. Clean all carbon
off
the piston top.
6. Cheek the cylinder head studs for damage and replace
them
if
necessary.
If
a stud is loose, tighten it using the fol-
lowing procedure:
a. Install two nuts on the stud as shown in Fig
ure
18.
b. Rotate the nuts so they contact each other, then hold
one nut and tighten the other nut against the first
nut.
c. Tighten the stud in the cylinder block by turning the
top nut until reaching a torque
of
60 Nom (44
ft.-lb.).
d. Hold the bottom nut, loosen the top nut, and remove
both nuts.
7. Check the threaded rocker arm support stud for dam-
aged threads. Replace it if necessary.
8. Check for warpage
of
the cylinder head-to-block gas-
ket surface with a straight
edg
e and feeler gauge (Figure
19). Measure diagonally, as well as end to end.
If
the gap
exceeds
0.07 mm (0.003 in.), have the head resurfaced by
a machine shop.
Installation
1. Make sure the cylinder head and block gasket surfac es
are clean.
5
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