Tappet Clearance Adjustment; Top End - Inspection; Camshaft Journal Wear - Suzuki GS-1000 Service Manual

Tappet clearance adjustment
After checking tensioning action, check all
valves
for
tappet clearance and. as
necessary.
adjust the clearance
to the specification
out-
lined
on page 3-5.
TOP
END
-
INSPECTION
One
camshaft is
provided for the intake valves
and
the other for the
exhaust
valves. Be sure to
discriminate between the
two.
The camshafts
should be checked for deflection and also for the
wear of
cams
and
journals if the engine has been
noted as giving
abnormal noise or
vibration or
to
lack power output. Any of t k s e malcon-
ditions may be caused by camshafts worn down
or
distorted
to the service
limit.
lnlef open T.D.C Exhauqt clolcd
t B T O C l ,IA.T.D C.1
! ~ * - 2 6 .
lnlpt closed
'
L4.B D
C
I
Exheusl open
(R R.D.C.)
B-D
C.
Fig. 760.
CamshaR wear
e
Worn-down cams are often the cause
of mis-
timing valve operation resulting in reduced
power output. The limit
of
cam wear is
specified for both intake and
exhaust
cams
in
terms
of
cam height
@
,
which is
to be
measured with
a
micrometer.
Replace
camshafts if found worn down
to
the limit,
Fig.
7 4 1
Cam
height s~ecification
Service limit
Intake cams
I c a m e s
,(l14301-1.4313in.) (1.4t%Sin.)I
Exhaust 35.775
-
35.805
rnm
35.480 mrn
I
cams (1.4085
--
1.4096
i n . )
(1.3968 in.)
I ]
Camshaft journal wear
s
Determine whether each journal is
worn
down to the limit
or not by
measuring
the
running clearance with the camshaft installed
in place. Use plastigage to read the
clearance, which is specified
as
folIows:
0.025
-
0.053 rnm
1
0. I S mrn
(0.0059
in.)
(0.W10
--
0.002
1
in.)
;
Cmshaft/Journal clearance
Be sure
each
camshaft is fastened
down in
place by
its camshaft holders. Tighten the
camshaft holder bolts to the following torque
I
Standard
value:
Camshaft holder
bolt torque:
1.0 kg-rn
(7.0 lb-ft)
!
Service
limit