Tappet Clearance; Checking The Tappet Clearance - Suzuki GS850G Service Manual

TAPPET CLEARANCE
1
000 6 000 12 000 18 000 24 000
km
600 4
000
7 500 I5 000 miles
The
tappet
clearance specification is the
same
for both intake and
exhaust valves. Too srnaIl
a
tappet
clearance may seduce the engine
power; too large a tappet cIearance increases
valve
noise and hastens
valve
and seat
wear.
When the tappets are set to the specified
clearance, the engine wilI run without
ex-
cessive
noise from
the vaIve mechanism and
will deliver full power. In this engine, the
tappet
clearance i s
increased
or decreased by
replacing the shim disc, made of a special
wear-resistant
material, fitted to the top of
the tappet.
The shim discs are easy to remove
and refit. Tappet clearance adjustment must
be checked and adjusted 1 )
at
the time of
periodic inspection, 23 when the
valve
mechanism is
serviced,
and 3) when the
camshafts
are disturbed
by removing them
Fig. 3-6
for
servicing. Fig. 3-7
Tappet clearance
specification
(Tor both intake
and
exhaust
valves):
(0.001 -0.003 in)
1 . Turn
crankshaft to bring the
exhaust
cam
CHECKING THE TAPPET CLEARANCE
of No. I cylinder
to
this
position. In this
condition, read the cIearance at the exhaust
tappets of Nos. 1 and 2 cylinders. Use
special tool
film
all
tappets.
NOTE:
I ) The
cam must be at position @)
ox
(@
fo check the rappel
cIearance or
to
remove the
shim disc. CIearance
readings should nor
be
raken with
the
cam in
any other
position than these
two posifions.
2) The clearance specifcarion is for a
COLD
en~ine.
3)
To
turn the
crankshaft for
clearance
check in^,
be sure
to use a 19-mm
wrench and
ro
rolafe in
&he normal
running direction.
A
I / spatk
plugs
should
be removed.
Thicknes
Fig. 3-8
s gauge
2. After
setting
the clearance to
thl
specification at the
exhaust
tappets of Nos
1
and 2
cylinders,
turn the
crankshaft 180"
(half rotation) to
bring
the intake cam
of
hTo. 1
cylinder to the position indicated
09900-20803