Aligning an engine with flange−mounted gearbox
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Aligning drive line
The drive line (engine and gearbox) and the propeller shaft must be aligned so that the radial offset and
angle offset of all the components are within the specified tolerances.
Caution:
In order to avoid damage by vibrations and oscillations, the alignment of the drive line must be
checked annually or after approx. 3000 operating hours and if necessary adjusted.
Parallelism of flanges
Check that shafts are flush in advance
D Using straightedge  at several points, check
whether gearbox output flange À and propeller
shaft flange Á are flush in relation to each
other.
Check for parallelism of flanges
D Join propeller shaft flange and gearbox output
flange together
D Slide feeler gauge à with a 0.5 mm blade
between the flanges, screw in a coupling bolt
and tighten slightly
D Pull out the 0.5 mm blade
D Check the gap dimension all round at 90°, 180°
and 270° with 0.58 mm and 0.42 mm blades
(the tolerance must not exceed 0.08 mm)
D Remove the bolt and apply a marking to the
gearbox output flange
D Rotate the gearbox output flange through 90°,
180° and 270° and repeat the check
If the measurement produces a reading of more
than 0.125 mm, then the propeller shaft flange is
running with excessive lateral runout (wobble).
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