WÄRTSILÄ Vasa R22, Instruction Manual

Page: 162 / 297

13.3 Split gear
If only the split gear wheel has to be changed, one half of the wheel
can be removed/mounted at a time. Hereby the valve timing will
be unchanged and it will not be necessary to adjust it.
13.3.1 Removing of the split gear wheel
After the gearing is removed according to section 13.2.2, the split
gear wheel (2) can be removed from the crankshaft, Fig 13-1.
1 Remove the end cover half.
2 Loosen the fastening screws (8).
3 Unscrew the axial screws (4).
4 Unscrew the fastening screws (8) and remove the gear
wheel halves.
13.3.2 Mounting of the split gear wheel
1 Clean the parting surfaces of the wheel halves and the
contact faces of the gear wheel and the crankshaft.
2 Apply Loctite 242 on the threads of the screws (4) and
(8).
3 Mount the gear wheel halves on the crankshaft
with
the parting face at right angles with the crank of cylinder No.
1 and fasten the screws (4) and (8) by hand.
4 Tighten the axial screws (4) to a torque of 10 Nm and
check that contact is established between the gear wheel and
the crankshaft flange.
5 Tighten the fastening screws (8) to a torque of 40 Nm.
The screws closer to the crankshaft flange are to be tightened
at first.
6 Tighten the fastening screws (8) to stated torque, see sec-
tion 07.1. The screws closer to the crankshaft flange are to be
tightened at first.
7 Tighten the axial screws (4) to the stated torque, see sec-
tion 07.1.
8 Check the base tangent length. W is measured across
(W1 and W2) and perpendicular (W3 and W4) (to joint 7 teeth).
Maximum Deviation = 0.02 mm.
9 Check the gear wheel roundness. Place a cylindrical
pin (ø10 mm) in the tooth gap as shown in Fig 13-3. Turn the
engine and use a dial indicator to get an indication for the
diameters (D1, D2 and D3). The maximum permissible differ-
ence between the measured values is 0.03 mm.
13 Camshaft Driving Gear 22-9601
13 - 6 VASA 22