Engine
SHOP MANUAL
Ch 1 page 65
1. Remove the valve seat inserts. Use a discarded valve that has
been ground so that the diameter of the disc is slightly smaller
than the inside diameter of the seat.
2. Fit the valve and weld around it with an electric welder.
Cool with water. Turn over the cylinder head and knock the
valve stem so that the valve and seat insert fall out.
3. Press in new valve seat inserts. Use drift
512260 and handle 512261.
Cool the drift and valve seat to approximately 80°C in
dry ice or using liquid air.
Pressing must be carried out rapidly.
Oversize valve seat inserts can be fitted if the
valve seat insert position has been damaged.
If this is the case, the seat must be machined
using valve seat cutter 512265.
Replacement of valve seats
512261
512260
Use protective goggles. Always turn the cylinder head around
with the underside downwards when tapping out the valve seat
ring. Otherwise there is a risk of loose splinters causing per-
sonal injury.
Be careful with the above-mentioned coolants and cooled com-
ponents. There is a risk of frost injuries.
WARNING
WARNING
Figure 110
Figure 111
Figure 112
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