Crank Web Deflection
Inspection / Measuring
A5.05. 02.02.01.00
M20
en / 14.10.2010 IB001439 3/4
02
Values for crank web deflection in mm:
NOTE
Crank web deflection first of all is a criterion of the alignment of the engine with the
shafting.
Heavy crank web deflection imposes additional loads on crankshaft and main
bearings. This means that the admissible deflection is determined by the engine
load. A high load admits less deflection than a low one.
The values below must be observed, if it is impossible to obtain the admissible limits
for the plant from MaK.
Only the values measured on an engine at operating temperature has to be used for
assessment. Values from a cold engine are of inferior importance.
M20
Cylinder 1 or last cylinder
with
additional load + 0,04 / - 0,09 mm
(flywheel/coupling)
All cylinders
without
external load + 0,04 / - 0,06 mm
Permissible values for realignment
of base frame mounted gensets
+ 0,03 / - 0,03 mm
in horizontal direction
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