SHOP MANUAL MT26-31 - 06.2005
Engine
Tier-3 710655-
Ch 1 page 52
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.
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 personal injury.
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.
Be careful with the above-mentioned
coolants and cooled components.
There is a risk of frost injuries.
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
WARNING!
!
WARNING!
!
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