Beta Marine Beta 10 Operator's Maintenance Manual page 22

PROBLEM: TRANSMISSION NOISE
Possible Cause
Check gearbox oil level:
"Singing" propeller:
Drive plate rattle at tickover:
Worn drive plate:
Propellor shaft hitting the gearbox
half coupling
PROBLEM: VIBRATION
Possible Cause
Poor alignment to shaft:
Flexible mounts not adjusted
correctly to take even weight:
Flexible mount rubber perished:
Loose securing nut on flexible
mount:
Insufficient clearance between the
propeller tip and the bottom of the
boat:
Loose zinc anode on the shaft:
Worn cutless bearing or shaft:
Weak engine support/bearers:
PROBLEM: MORSE CONTROL CABLE WILL NOT FIT
Possible Cause
Fitting incorrectly
Solution
Top up.
Check with supplier.
Check engine rpm (must be 850 rpm minimum in gear).
Change.
Move shaft back to give at least 5mm clearance (type 12/16 couplings only)
Solution
The alignment must be accurate even if a flexible coupling is used (see section
3 ALIGNMENT).
Check relative compression of each mount.
Replace. (Diesel or oil will eventually perish most rubbers.)
Check alignment and then tighten the nuts.
There must be at least 10% tip clearance between propeller and bottom of the
boat (ie 10% of the propeller diameter as clearance). Refer to boatbuilder.
Tighten or replace.
Replace.
Check for cracked or broken feet.
Solution
Cables are being fitted the wrong way around, switch over and fit the opposite way.
20