RDG603A8 - Issue 1 - Shire 14 Canal Boat Complete Manual 30, 35, 38, 40, 45, 50.doc
Page 19 of 50
Figure 3-8: Anti-Vibration Mount Installation Points
9. Engine Alignment
The gearbox output shaft flange and propeller shaft input flange must be almost
perfectly aligned. A maximum of 0.05mm (.002") misalignment in any plane is
acceptable. Ensure alignment is rechecked 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.
(Note: some types of flexible shaft couplings require the input and output to be
misaligned, check with the cou
pling manufacturer’s installation instructions).
Minimum clearance of 25mm between rails and bulkhead (forward).
Minimum clearance of 25mm between rails and engine beds
Normal mounting position.
Alternative mounting position if
engine compartment space is
restricted.
