Maintenance
2751
−
3/A1
Winterthur Gas & Diesel Ltd.
4.
Grinding the valve seat
Grinding in valve seats using the valve
spindle with grinding paste must be
avoided as a matter of principle!
Therefore, always use the valve grinding
device 94291 for grinding in the valve seats
in the following cases:
1) When new or reconditioned valve
spindles are fitted.
2) When the seat surface on the valve seat
is badly damaged (impacts, corrosion
scars).
Note: Regarding the operation of the
grinding machine refer to the
operating instructions of the
respective manufacturer.
D
The grinding must produce an even and
smooth surface.
Valve seat angle = 30
_
+ 2’
0
The grinding allowance on the valve seat
is maximum 1.5 mm. The wear condition
can be checked efficiently with gauge
94279 in combination with feeler gauge
94122. Possible burn scars at the inside
of the valve seat must not exceed 5 mm.
The depth of the burn scars can also be
verified with the gauge 94279 as shown in
Fig. 4.
D
Valve seats which exceed the above
mentioned values must be replaced.
Valve Seat
−
Replace / Grind
2016
94291
1
016.773/08
EXAMPLE DRAWN WITH PNEU-
MATICALLY POWERED DEVICE
FROM CHRIS-MARINE
Fig. 3
max. 5 mm
94279
003.458/00
Fig. 4
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