Volvo Penta 300 Series, Руководство по ремонту

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56
Repair Instructions
Cylinder head, installing
Special tools: 999 2479, 999 6272
1
Clean the cylinder head and the cylinder block sur-
face. Remove any rust and carbon from screw holes
and threads of the cylinder head mounting screws.
Clean threads with a tap (M12). Remove loose dirt
with a vacuum cleaner or compressed air.
2
Check liner height. For liner height see Workshop
Manual “Technical data”.
The height difference between close linings should be
maximum 0.02 mm.
For measuring see “Cylinder liner, installation”.
3
Check the cylinder head screw “waists” for distortion.
Dip the screws completely including the screw heads
in rustproofing agent P/N 116 1346-0 and allow them
to run off in a net. The screw should not drip during
installation (oil can otherwise be forced out and inter-
preted as leakage).
IMPORTANT! The screws are phosphated and
must not be cleaned with steel brushes. If the
cylinder head is painted the contact areas of
the cylinder head screws must be free of paint.
Otherwise the pressure in the screwed joint will
otherwise be very bad.
4
Apply the cylinder head gasket and install the cy-
linder head.
5
Tighten the cylinder head screws in numerical order
according to the tightening diagram below in five
stages.
1st tightening: 30 Nm
2
nd
tightening: 60 Nm
3 rd tightening: 100 Nm
4
th
tightening:
Angle-tighten the screws 90° in numerical
order as follows:
Mark up the position of the screw heads with
a chalk mark on the screw and cylinder head.
Do not use a punch or a scribe as they can
confuse future operations.
Mark a 14mm socket, locate the socket as
illustrated above, with the socket marking 90°
counter-clockwise from the chalk mark on
the cylinder head.
Carry out angle tightening by tightening until
the socket mark and the cylinder head chalk
mark are opposite each other.
Finally:
Angle-tighten the screws 90° in numerical
order as above.
Tightening is finished when all screws have
been angle tightened to 90°. Retightening af-
ter use is not necessary.