Replacing The Seal On Flywheel Side - Partner K 650/700 Active Workshop Manual

6
The purpose of the crankshaft in the engine is to
convert the forward and return strokes of the piston
to rotation. A stable construction is required to
accomplish this in order to withstand high pressure,
torsional and flexural stress, and also high rotation
speeds. The connecting rod is also exposed to high
acceleration and retardation speeds when it moves
between the top and bottom dead centres. This sets
special requirements on the bearings, which must
withstand rapid load alternations. The bearing cage
must also withstand high temperatures and friction.
During servicing it is therefore important to check the
cage for cracking, wear on the sides, and discolouring
as a result of overheating.
60
Crankshaft and crankcase
Replacing the seal on
the flywheel side
Mod. 650, 700
Screw down the seal extractor as far as
possible in the seal and pull off the seal.
504 91 40-01
Lubricate the shaft with oil and fit a new
seal.
502 50 82-01
Mod. 950, 1250
Remove all parts so that the seal becomes
accessible.
Screw down the seal extractor and pull off
the seal.
502 50 55-01
The crankshaft is housed in the crankcase with
heavy-duty ball bearings. In addition to acting as
the bearing point for the crankshaft, the crankcase
also functions as scavenging pump for the fuel/air
mixture when this is induced from the carburettor
and pressed up in the cylinder
chamber . The crankcase must be completely tight
in order not to interfere with the pump function.
There must be no leakage at the crankshaft, between
the crankcase halves, or between cylinder and
crankcase.
Replacing the seal on
the flywheel side
Mod. 500, 540Mod. 650, 700
Dismantle all parts on the flywheel side
so that the seal is accessible.
Remove the draw key for the flywheel by
means of diagonal cutting pliers.
Screw down the seal extractor as far as
possible in the seal and pull off the seal.
Lubricate the shaft with a few drops of oil
and place a new seal in position with the
shell plate facing outwards.
Press down the seal with a suitable drift
to the correct position in the crankcase,
1 mm (.04") below the crankcase plane.
Fit the other parts in the reverse order to
dismantling.
Mod. 950, 1250
Dismantle all parts on the flywheel side
so that the seal becomes accessible.
Screw down the seal extractor as far as it
goes in the seal, and pull off the seal.
's combustion