MTU Detroit Diesel 183 Series Technical Publication page 245

Task Description
05-4202 Valve Grinding
Preparatory operation:
Valves removed (05-4102).
20080/0 E 97-02
Valve grinding
Clean removed valves and remove stubborn carbon
deposits.
Check valves for reusability. Surface of valve stem
ends must not be damaged. Valve keyways must not be
chipped and chrome layer on valve stems must be
uninterrupted.
Replace burnt valves.
Check valves for concentricity and dimensional
accuracy. Valves must not be straightened.
Minor deviations in concentricity can be compensated
by regrinding valve seat on a valve grinding machine.
Clamp valve as closely as possible behind valve head
to avoid vibrations.
Set required grinding angle on the scale according to
Tolerance and Wear Limits List 05-4202 or 05-4202a.
Slowly advance valve towards rotating grinding stone
until stone comes into contact with valve seat surfaces.
Grind with small advance until valve seat is smooth
around the entire circumference.
Measure height of outer edge of valve seat.
Replace valve if the limit values are exceeded (see
Tolerance and Wear Limits List 05-4202 or 05-4202a).
Group 05
Subgroup 4202
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