Engine
SHOP MANUAL MT26-31 - 06.2005
Tier-3 710655-
Ch 1 page 55
512259
512258
10.
Machine the valve seat by cranking clockwise while turning
the feed screw.
Never crank counterclockwise, as this could damage the
cutter.
Lubricate with cutting oil during the procedure.
11.
When the machining of the valve seat is
completed, reduce the cutting pressure by
turning the crank 23
turns without feeding.
Then continue to turn the crank while turning
the feed screw anti-clockwise. The valve seat
cutter is now ready for the next valve seat.
1.
Press out the valve guides using drift 512259.
2.
Press in the new valve guides using drift 512258
Press the guide down as far as the
drift allows, i.e. until it makes contact with
the spring seat in the cylinder head.
Renewing the valve guides
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