Perkins M85T - Part Finished Shafts; Flexible Couplings

Chapter 2 TPD 1399E
Page 6
Part nished shafts
Where the precise shaft length can not be determined
until the engine has been tted in the boat, propeller
shafts are sometimes supplied with excess length, to be
completed locally.
In these cases a clamp type coupling (A) should be used,
and it is not necessary to machine a shoulder on the shaft
end to take forward thrust. It is good practice however
to use one of the methods described above to provide a
safeguard against loss of the shaft when going astern.
Flexible couplings
Elasticity may be incorporated in the connection between
the gearbox output ange and the propeller shaft by
means of a exible coupling (B1). This type of coupling
is not intended for use with continuous misalignment, but
will cater for momentary deections, due for example
to the effect of shock loadings on the anti-vibration
mounts supporting the engine. The exible coupling is
sandwiched between the gearbox output ange and the
shaft coupling.
Couplings can be supplied to suit most of the marine
transmissions that may be specied with the engine.