Table of Contents
Advertisement
1 Yoke spreg cam
5. Pull the valve out. If the stem tip oF re
Lainwr lock groove edges are slightly ex-
panded causing difficult removal. the
surface might be Gariagee. First, use @
fine file to remove any lip that exists on
the stem enc then ramov>
t70 valve.
NOTE,
——
Be sure to remove the valve stem seal before
remaving the valve. Otherwise the sea! could
be darmayed,
6.
Docarbonization of the head and cui
porwnts.
Carbon depasits build up in the com
bustion chambers.
on the valves, and in
the exhaust ports. Thoroughly clean ail
parts with a blunt scraper. then wach in
solvent
and dry will)
compressed
air
Ihe parts cen then
D6 examines
ard
measured for woar.
Valvus, Valve Spr
Valve Seats
1, Check the intake and exheust valve
stuns for bending 2d grooved weer.
And check the stem encs for weer.
Mecsuremems should be dona in tires
ions, upper, midele, and lower.
ys. Valve Guides and
Intake valve stem diameter:
6875~6990mm
(0.2746 ~ 0.2752 nm)
Exhaust valve stem dizmater
6955 ~ 6.970 mm
(0.2528 ~ 0.2744 in)
2. Checking the valve springs
a. Ths engine use twa springs of differant
to provent valve flat or surging.
The crart below shows the basic value
characteristics
b. Even though the spring
6 consiructed
of durable spring steel, it gradually loses
some of its tension. This is ovidencod
one way by # yiadual shoneine of
free length. Use a vernier caliper to
mensure spring 'roa longth if the fro
length uf any spring has decreased
more
then
2 mm
(G08
in) from
its
specification, replace it
Outer
inner
Free length
>ow
"AD mm(1 37)
Tate
tenggth (Valve closed
34.1 mm '1.34 9)
Inetalled pressure
(Valva closed)
3
177 4 1kg 7 9=7 PI)
Compressed levath (Va ve op=tl
281 mmil 1
25. Wn 098
ypressud pressure (Valve open)
701 ££9h9 (1566-198
Advertisement
Table of Contents
