WÄRTSILÄ PAAE051728, Instruction Manual

Page: 208 / 394

12.3.6.4 Fitting an old type of exhaust valve seat ring
1 Clean the cylinder head bores carefully
by grinding
gently with a grit 400 or finer emery cloth. After grinding the
surface must be cleaned with Loctite 7063 Cleaning spray.
2 Check the bore diameter in the cylinder head,
see sec-
tion 06.2 in this manual.
3 Heat up the entire cylinder head
to 100°C by means of
either steam heating, e.g. put the cylinder head into a closed
box, or a gas burner.
4 Cool the seat ring
to about -18°C prior to fitting.
Note! It is important that the entire cylinder head is heated up, not
only the seat bore.
5 Lube cylinder head seat bores
using water-soap solu-
tion or Molykote 55 O-ring grease.
6 Mount the O-ring
7 Mount the exhaust valve seat
by using one of following
methods:
·
Put the seat rings into a guiding bush and press in the seat
with a guided arbor. A special tool 800148 is also available.
This tool can be ordered from the engine manufacturer.
·
Insert the seat ring by using an exhaust valve. Knock on the
valve until the seat ring is correctly seated.
Note! Mounting of a exhaust valve seat ring should be done carefully
so that the seat ring is correctly seated.
8 Check the eccentricity of the sealing face
in relation
to the valve guide, and if it exceeds 0.1 mm, the seat surface
should be ground in a seat grinding machine. A special tool
2V12T0747 is also available for checking the eccentricity. This
tool can be ordered from the engine manufacturer.
9 Pressure test the cylinder head water side before mount-
ing
with a test pressure (800109) of 10 bar if possible.
12 Cylinder Head with Valves 32-200646-01
12 - 12 WÄRTSILÄ 32