TPD 1399E Chapter 9
Page 35
Provision for Power Take-Off
Additional equipment may be driven from the
crankshaft nose, as advised below.
• Axial loads (i.e. involving no side load on the
crankshaft nose).
The cranknose and pulley xing arrangement is
capable of transmitting up to full engine power
(subject to engine and drive line rotating inertias). For
a rigidly connected PTO the maximum inertia of the
PTO drive arrangement and crank pulley should not
exceed 0.01 kgm
2
. In practice this means that axially
driven machinery should have a exible coupling with
appropriate characteristics in the drive line. Seek
advice from Wimborne Marine Power Centre if you
are considering axially driven equipment.
• Belt Driven Loads
Loads of up to 8kw may be driven by belts, providing
that the side force is applied at a point not more
than113mm from the cylinder block front face. Pulleys
are available to meet this requirement.
Part 34131 has a single ‘A’ section groove of 143mm
O.D. (137mm PCD.) and is shown on A.
Part 34132, shown on B, has four ‘A’ section
grooves:-
2 at 195mm O.D. (189mm PCD)
1 at 152mm O.D. (146mm PCD)
1 at 106mm O.D. (100mm PCD)
As a rule of thumb the maximum power offtake should
not exceed 2kw per belt.
Engines can be specied with PTO driven equipment
already mounted, including second alternators, bilge
pumps, and refrigerator pumps.
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