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Repair Instructions
3
Check that the lower O-ring (31/32/41/42/43 only) has
come up with the copper sleeve and that the lower
sealing point is clean.
If the sealing surface is damaged or soot coated it
can be cleaned with a nylon brush.
See "Cleaning copper sleeve seat" on this page.
Remove upper seal ring. Clean upper and lower
guides in the cylinder head.
Cleaning seat for copper
sleeve
Special tools: 885 289
It is very important that all forms of deposits on the
copper sleeve mating surface in the cylinder head are
removed before installing the new copper sleeve.
1
Mount brush 885 289 on a variable speed drill. Maxi-
mum engine speed for the brush is 1000 rpm. Insert
the brush in the nozzle and clean the seat. Blow
clean with compressed air.
54
Copper sleeve, installing
Special tools 31/32/41/42/43 series: 884 945
44/300 series: 885 237
It is important that the steel ring and the copper
sleeve are replaced at the same time in order to re-
tain the correct clearance between ring and sleeve.
The O-ring and the upper sealing ring should always
be replaced with new ones.
IMPORTANT! The 31/32/41/42/43 series has
an early and a late version of the copper
sleeves and cylinder head. Ensure diameter on
the copper sleeve points correspond with the
cylinder head hole to the combustion chamber.
The diameter of the hole on the late version is
10.3 mm, the early version has a smaller diam-
eter.
1
Grease the upper sealing ring (1) with petroleum jelly
or soapy water and place it in the cylinder head.
Applies to 31/32/41/42/43 series
2
Install a new O-ring (2) around the new copper sleeve
lower guide. Place a new ring and copper sleeve on
drift 884 945.
Guide the drift into the cylinder head. Hit the sleeve
in with a plastic mallet until it bottoms.
IMPORTANT! Note that with the cylinder block
installed: the piston must not be at Top Dead
Center (TDC) when the replacement takes
place. The piston may be damaged by the tool
during installation.
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