Crankweb Deflection - Diesel WARTSILA F 240 Manual

Manual
F 240
1. Crankweb
deflection
Ver. 01
ENGINE ALIGNMENT
23B 23B

CRANKWEB DEFLECTION

CRANKWEB DEFLECTION
Before starting work, please consult:
-- chapter 2, "BACKGROUND INFORMATION" ;
-- chapter 3, "TECHNICAL DATA" ;
-- SUB-- SUPPLIERS MANUALS.
The primary objective of crankweb deflection measurement is to check whether the
engine bearing bores are in line. The main bearings are machined so accurately that
the crankweb deflection is within 0.03 mm when the crankshaft is carrying no load (i.e.
the weight of the flywheel). With the flywheel mounted the crankweb deflection of the
crank nearest the flywheel will exceed 0.03 mm. The same applies to the engine's
non--flywheel side when this carries a heavy vibration damper or other auxiliary mass.
A large crankweb deflection need not necessarily be a result of untrue engine
alignment, and need correction.
measurements that must be carried out during engine installation, it is essential to
work consistently from the following points of departure :
-- The engine must be cold ;
-- If a marine installation is involved, the relevant vessel must be floating freely in
the water.
-- Take crankweb deflections with the engine in operation condition.
clock gauge
crank shaft
To permit proper evaluation of the deflection
countre weight
measuring point
crank web
crank pin
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