43
Problem: Vibrations
Possible Cause
Solution
Poor alignment to shaft:
The alignment must be accurate even if a flexible
coupling is used (please refer to ‘Alignment’ on page 10).
Flexible mounts not adjusted correctly to take even weight: Check relative compression of each mount.
Flexible mount rubber perished:
Replace. (Diesel or oil will eventually perish rubbers).
Loose securing nut on flexible mount:
Check alignment and then tighten the nuts.
Insufficient clearance between the propeller
There must be at least 10% of the propeller diameter
tip and the bottom of the boat:
as tip clearance between the propeller and the bottom
of the boat. Reduce propeller diameter/increase pitch
Loose zinc anode on the shaft:
Tighten or replace.
Worn cutless bearing or shaft:
Replace.
Weak engine support/bearers:
Check for cracked or broken feet.
Problem: Knocking noise
Possible Cause
Solution
Propshaft touching gearbox output coupling
Adjust, giving correct clearance give 5mm - 10mm
through split boss or Type 16 coupling:
between gearbox and propeller shaft.
Flexible mount stud touching engine bed:
Adjust stud to clear.
Drive plate broken:
Replace/repair.
Engine touching engine bed:
Re-align engine/modify bed.
Injectors blocked through excess carbon
Remove and check injector nozzles, replace if required.
caused by water in the fuel:
Problem: Transmission noise
Possible Cause
Solution
Check gearbox oil level:
Top up.
“Singing” propeller:
Check with propeller supplier about ‘harmonics’.
Drive plate rattle at tickover:
Check engine rpm (must be 850rpm min. in gear).
Worn drive plate:
Change.
Propeller shaft hitting the Gearbox half coupling:
Move shaft back to give 5mm - 10mm clearance
(Type 12/16 couplings only).
Propeller torsionals causing gears to rattle at low rpm:
Fit a torsional flexible coupling such as Centaflex
type 16 or equivalent.
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