MZ TS 125 Repair Manual page 18

Take care that the lubricating holes to be drilled end Do not force the crankshaft through a cold bearing b e
in the oil catch pockets.
cause this will render it useless (out of true) before i t
Remove
all
burr from the holes. has run. Then the contact-breaker cam lifts anywhere
See
to
it that the fit is not too narrow
-
the sliding
but not on the cam lobe! O r the primary &in is
al-
bearing requires a continuous oil film.
ternately slack and taut during one revolution.
Fig.
30.
Replacing the sn)all-end bush
The a
X
i a l c l e a r a n c e (see double arrow) of the
connecting-rod in the crankshaft, in new condition, is
0.25 to 0.40 mm
When the connecting-rod is copper-plated on all sides,
this clearance is reduced to
0.13 to 0.36 mm
With an axial clearance of 0.55 mm, the crankshaft is
worn out.
The crankshaft (Fig. 31) is used unchanged for the
engines of the ES 12511, TS 125, ES 15011 and TS 150.
It may happen that the connecting-rod of a new crank-
shaft was deformed by improper transport or storage.
As a distorted or oblique connecting-rod will wear
down the small-end bush before long, check the con-
necting-rod in any case.
Pig. 32.
Mounting the crankshaft
W e a r l i m i t s a t t h e g e a r - s h i f t m e c h -
a n i s m
-
c a u S e s o f g e a r - s h i f t f a u l t s :
(1) Bolt a t the retaining plate has a clearance of mcjre
than 0.3 mm
(2) Cut-out in the retaining plate worn down more
than 0.4 mm (size in new state 20.6:., mm)
(3) Window in the segment lever and dogs of the
gear-shift member heavily worn (round)
(4) Return spring slack
(5) Gear-shift dog worn down more than 0.3 mm or
blue discoloration (size in new state 5
~ : : ~ ~ ~
mm)
(6) Spring or ball (6.35 mm) jams in the gear-shift
fork
Fig.
31.
Crankshaft
.
Fig.
33.
Gear-shift mechanism
'
Oil the crankshaft end.
At the re-heated casing half, h e a t the i n n e r Screw the retaining plate with gear-shift segment in
r a c e o f t h e
c r a n k
S
h a f t b e a r i n g
by
place and fit the lock plates.
means of a heated mandrel. (l) in such a manner that
Insert gear-shift shaft with gear-shift member; prior
the crankshaft slides to the shoulder due to its own
to this operation slightly oil the bearing area of the .
weight.
.
shaft.