Operation Manual

Job Card No.:
Engine:
Filing No.:
Checking and Reconditioning Inlet
and Exhaust Valve Cones and Val-
ve Seat Rings
Before re-using the valves, these are to be checked
and reconditioned, if necessary, as described in the
following:
Faulty condition of the engine, inadequate
preheating and treatment of fuel and cooling
water, and non-permissible lugging operati-
on (speed drop with control lever at fuel stop),
etc. can - among other causes - bring about
premature failure of valves.
Observance of the following instructions is
prerequisite for an acceptable valve opera-
ting life.
Job:
Preparation
● Remove valves (job 01.05.01)
● Clean off deposits on seating surfaces.
● Remove carbon from valve discs and valve-seat
rings with a scraper and wash with distillate fuel.
To facilitate removal of water-solulable sulp-
hurous deposits, the used valve cones can be
soaked in water for a few hours.
Checking valve cones
The valve cones can be re-used, if the following
preconditions are fulfilled:
- Seats free from burnt spots, blow-by, cracks or
pounding marks,
- no damage on cone clamp groove,
- within the zones X and Y (Fig. on page 2) no
interrupt of the (bright) chromium layer,
© 1283
Valve Seat Ring and Valve Cone
0178-08-297 6506
01.07.01 Page 1 of 2
S/BVM 628
Tools:
- Standard tools,
- Dial gauge,
- Magnifying glass
(min. 4-fold magnification)
Auxiliaries:
- Distillate fuel
Job Cards:
- 01-05-01
- 06.02.01
245 Exhaust valve
205 Inlet valve
285 Exhaust valve
215 Inlet valve
befor reworking
© 50 659 0