RDG603A63 - Issue 10
Page 32 of 104
10. 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 manufa
cturer’s installation instructions.
•
Minimum clearance of 25mm between rails and engine beds.
11. Engine Inclination
•
The engine installation angle is the angle of the crankshaft centre to the water line
).
•
The propulsion efficiency decreases as the engine installation angle increases.
•
The
maximum
engine installation angle is 15°
Figure 20: Maximum Engine Installation Angle
Engine Installation Angle
Water Line
MAX 15°
