6 Note the marks of the valves
or mark them so they can
be re-installed into the same guide if they are in good condition.
12.3.3 Checking and reconditioning of valves
and seats
1 Clean the valves,
seats, ducts and guides as well as the
underside of the cylinder head.
2 Control the burning-off on the exhaust valve disc
ac-
cording to Fig 12-6. The measure “Y” should be more than
7.8 mm (nominal 8.8 mm) and measure “Z” should be less than
1 mm. If the measures exceed these limits the valve must be
replaced.
Control of burning-off on valve
3 Reconditioning of inlet valve and valve seat ring
is
recommended to be done by grinding or by machining. If there
is only slight pitting, lapping is adequate. Valve and seat ring
grinding, see section 12.3.5.
4 Reconditioning of exhaust valve and valve seat ring
has to be done by grinding or by machining. If the sealing faces
are bright or if there is a coherent sealing face, grinding is not
necessary. Valve and seat ring grinding, see section 12.3.5.
Note!
If blow-by has occurred, the O-ring for the corresponding
valve seat ring must be changed. Blow-by increases the
temperature and the O-ring is “burned”, which will result in
water leakage into the cylinder.
Z
Y
Burn-off area
Ø
X
Fig 12-6
4012049706
12
Cylinder Head with Valves
32-200646-01
12 - 8
WÄRTSILÄ 32
Summary of Contents for PAAE051728
Page 4: ......
Page 18: ...Appendix B Welding Precautions 200640 00 6...
Page 26: ...01 Main Data Operating Data and General Design 32 200634 01 01 8 W RTSIL 32...
Page 60: ...Appendix A Environmental Hazards 200507 02A 10...
Page 68: ...Page 7 7 Document No 4V92A0645 Rev j...
Page 84: ...03 Start Stop and Operation 32 200402 04 03 12 W RTSIL 32...
Page 98: ...04 Maintenance Schedule 32 200623 01 04 14 W RTSIL 32...
Page 154: ...07 Tightening Torques and Use of Hydraulic Tools 32 200643 01 07 30 W RTSIL 32...
Page 162: ...08 Operating Troubles Emergency Operation 32 200402 01 08 8 W RTSIL 32...
Page 164: ...Specific Installation Data 2005 01 09 2...
Page 178: ...10 Engine Block with Bearings Oil Sump and Cylinder Liner 32 200150 10 14 W RTSIL 32 34SG...
Page 216: ...Appendix A Testing of cylinder tightness 32 200142 A 4 W rtsil 20 32 34...
Page 226: ...13 Camshaft Driving Gear 32 200546 02 13 10 W RTSIL 32...
Page 254: ...15 Turbocharging and Air Cooling 32 200549 10 15 20 W RTSIL 32...
Page 274: ...16 Injection System 32 200627 01 16 20 W RTSIL 32...
Page 280: ...Fuel System 32 200508 07 17 6 W RTSIL 32...
Page 314: ...19 Cooling Water System 32 200050 19 14 W RTSIL 32...
Page 394: ...23 Instrumentation and Automation 32 200115 II 23 60 W RTSIL 32...