27
TS 700, TS 800
Note:
The vacuum initially decreases on
account of the diaphragms in the
cylinder, but then gradually builds
up as the process is repeated
several times until the same
pressure is present before and after
the diaphragms.
If the vacuum reading remains
constant, or rises to no more than
0.4 bar within 20 seconds, it may be
assumed that the oil seals are in
good condition.
However, if the pressure continues
to rise (reduced vacuum in the
crankcase), the oil seals must be
replaced.
– After finishing the test, open the
vent screw and disconnect the
hose.
– Remove the test flange.
– Install the carburetor,
– Loosen the muffler screws and
pull out the sealing plate.
– Tighten down the muffler screws.
– Tightening torques,
– Install the decompression valve,
– Reassemble remaining parts in
reverse order.
It is not necessary to dismantle the
complete power unit in order to
replace the oil seals.
Clutch side
– Remove the clutch,
see
– Free off the oil seal in its seat by
tapping it with a suitable tube or a
punch.
:
Apply puller (1) 5910 890 4400
with No. 3.1 jaws.
– Clamp the puller arms.
– Pull out the oil seal.
Important:
1
376RA057 TG
Avoid damage to the crankshaft
stub.
– Clean the sealing face with
standard solvent-based
degreasant not containing any
chlorinated or halogenated
hydrocarbons.
– Lubricate the sealing lips of the
new oil seal with grease.
:
Slide assembly sleeve (1)
1107 893 4600 over the
crankshaft stub.
1
376RA058 TG
– Slip the oil seal with the open side
facing the crankcase over the
assembly sleeve.
:
Use the press sleeve (1)
4224 893 2401 to press it home.
– Remove the assembly sleeve.
1
376RA059 TG
– Turn the crankshaft through
several times after approx. 1
minute.
– Reassemble remaining parts in
reverse order.
7.3
Oil seals