Meridian Yachts 490 PILOTHOUSE, Owner'S Manual, Page: 39 / 88

490 Motoryacht • Owner’s Manual Chapter 3: Propulsion & Related Systems
33
Shaft-Transmission Alignment
Alignment between the engine trans-
mission output shaft and the propeller
is very critical. The alignment has been
performed at the factory and was
rechecked by the dealer after the yacht
had been in the water for 48 hours.
•
An alignment inspection should be
performed by a marine mechanic as
part of the routine maintenance pro-
gram after the initial 30 hours of
operation, then every 60 hours and
whenever unusual noise or vibration
is noticed.
•
Shaft-transmission alignment
should be performed by a marine
mechanic since it requires moving
the engine and prop shaft.
•
To insure proper alignment after a
haulout or dry storage, wait 48
hours after launching before final
alignment adjustments by a marine
mechanic are made.
Shaft Log Packless Sealing System
The shaft log packless sealing system’s shaft seal is a maintenance-free, watertight seal that does not require
packing or adjustments.
SYSTEM DAMAGE HAZARD!
•
If you suspect a shaft-transmission misalignment, have a qualified mechanic perform an
alignment inspection as soon as possible.
•
Continued use may lead to premature engine, transmission, shaft, shaft seal and/or
hull damage!
C AU T I O N ! !
TRANSMISSION-TO-PROP SHAFT COMPONENTS (TYPICAL)
SECTION VIEW
OF HULL
CLAMPS
CLAMPS
SHAFT LOG
(TRIANGLE FLANGE)
BELLOWS
SHAFT
ROTOR
FLANGE BOLTS
CARBON/GRAPHITE
FLANGE
COUPLER
TRANSMISSION
OUTPUT FLANGE