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-----S."....-
J'J)!lI~ 1!l!f~J
Cylinder
heads,
piston
and valves
46
Every 10.000 kms. (600Q miles) the cyli nder
head shnuld be
removed
for decarbonizing.
The combustion chamber and piston crowns
are best cleaned with a blunt scraper and a
wire brush and washed off with petrol.
Check that Ihe valve seats are properly
sealed by
pouring some
petrol through
Ihe
Inlel
and
exhaust ducls
and observing if any
seeps through
between
seats and valves.
H
so,
the
valves should be dismantled and
Ihe seats ground
in wilh emery paste
.
AI the end
01
this
operation the
head
and
1
Fig.
22
valves should
be thoroughly cleaned with
pelrol and compressed
air
10
remove all
traces
01
the
abrasive.
When
Te.assembling
the heads the nuts and
hold
down studs should
be
tightened
in
a
crossed sequence (See 1-2-3-4-5-6 In
fig_ 22)
using
a
10rque
wrench
set
at
3.800
Kg/m
[27
It
Ibs_}
.
47
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