
If the valve seat cannot be restored to correct dimensions by grinding or is loose or
damaged, change the valve seat as follows.
Using the set of tools 345-326-3, 345-570-3 and 061-10 thread the valve seat bore, heat
the cylinder head to 390ºF/200ºC, screw in the puller and press out the valve seat (Fig.
24).
Reheat the cylinder head
and immediately press in
the new valve seat using
the mandrel. After the
head has cooled,
machine the valve seat to
the correct dimensions.
Valve sealing can be
checked by installing
them and, while pressing
the valve heads to the
seats, pouring kerosene
alternately into the intake
and exhaust ducts of the
cylinder head. There
should be no detectable
seepage of kerosene for
at least one minute.
If necessary, the valves
can be lapped to achieve
a tighter seal.
Lapping-in the valve to
cylinder head seat:
Fit a spring around the
valve stem between the
valve head and guide to
help lift the valve off the
seat approximately 3 to 6
mm.
1. Coat the valve head
face with a thin film of
fine grinding
compound, insert the valve with the hold-off spring into the valve guide and fit tool
345-332-3 for turning the valve on the valve stem end.
2. Rotate the valve in both directions, pressing it from time to time to the seat.
Fig. 4.3-2. Removal of
Valve Springs
Fig. 4.3-3. Measuring the Side Play
Between the Valve Stem and Bushing
Fig. 4.3-4. Correct Position of Valve Seat Chamfer
Содержание 2000 -10 series
Страница 1: ...Year 2000 Repair Manual ...
Страница 14: ...Table 1 2 1 cont d Lubrication diagram ...
Страница 177: ......
Страница 178: ......
Страница 179: ......
Страница 180: ......
Страница 181: ......
Страница 182: ......
Страница 183: ......
Страница 184: ......