MTU Detroit Diesel 183 Series Technical Publication page 251

Task Description
20080/1 E 98-12
Clamp core pin (10) in centre of guide with steady rest
clamp (11) .
Note
The rotating tool must turn as easily as before.
Raise turning device and turn rapid adjusting screw (1)
to position cutting tool (3) beside inner valve seat edge.
Tighten locknut (2). Avoid cutting.
Hold knurled wheel (12) for feed and turn crank (13)
clockwise. At this point, cutters usually remove an
irregular amount of material. After turning, release
locknut of rapid adjusting screw and reposition cutting
tool inwards.
Group 05
Subgroup 4532
Page 5