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7. Engine Alignment
• The gearbox output shaft flange and propeller shaft input flange must be almost
perfectly aligned. A maximum of 0.05mm (0.002") misalignment in any plane is
acceptable. Ensure alignment is recheck after the first 4 hours of running, after the first
month and thereafter annually.
• If the engine is out of alignment it will result in excessive vibration and possible damage
to the stern tube and propeller shaft.
• Boats that are fitted with fully flexible drive couplings should still have the engine and
shaft alignment as close as possible. A dummy shaft may be required for this purpose.
Some types of flexible shaft couplings require the input and output to
be misaligned, check with the coupling manufacturer's installation instructions.
• Minimum clearance of 25mm between rails and engine beds.
8. Engine Inclination
• The engine installation angle is the angle of the crankshaft centre to the water line
(Figure 12).
• The propulsion efficiency decreases as the engine installation angle increases.
• The maximum engine installation angle is 15°
Water Line
RDG603A81 – Issue 2
Figure 12: Maximum Engine Installation Angle
Engine Installation Angle
MAX 15°
Page 24 of 93
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