19
Series 4141 Powerhead
Use the assembly drift (2)
1108 893 4700 to center the
small end and piston. Then push
the piston pin (1) into position by
hand (the pin slides home easily
if the piston is hot).
– Fit the snap rings on the right and
left so that the ring gaps face
either up or down on the piston’s
vertical axis.
Install diaphragm carriers (2) on
the right and left of the cylinder
and tighten down to 3.5 Nm
(2.6 lbf.ft).
Note:
Install new gaskets.
VA
2
1
380RA037
Fit heat shield (1) on cylinder and
tighten mounting screws to 4 Nm
(3 lbf.ft).
Note installed position:
Cutout for ignition lead (see arrow)
is at exhaust side.
Position the piston rings (1) so
that the radii at the ring gap meet
at the fixing pin in the piston
groove - see 5.7.
Lubricate piston and piston rings
with oil and rest the piston on the
wooden assembly block (2)
VA
380RA028
2
1
1108 893 4800.
Note:
Lubricate the inside of the cylinder
with oil and line it up so that it is
positioned as it will be in the
installed condition. It is important to
observe this point as the piston
rings might otherwise break.
Use clamping strap (1)
0000 893 2600 to compress the
piston rings around the piston.
VA
380RA029
1
Slide the cylinder over the piston
- the clamping strap is pushed
downward as the piston rings slip
into the cylinder.
.
– Remove the clamping strap and
wooden assembly block.
VA
380RA029
1
– Line up the cylinder and gasket.
– Insert cylinder mounting screws
and tighten down to 9 Nm
(6.6 lbf.ft).
Assemble all other parts in the
reverse sequence.
Note:
Install new gaskets.
Set air gap between flywheel and
ignition module - see 6.2.2.
Summary of Contents for 4141 Series
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