ANTARES 44 SUPPORT
DRIVELINE SERVICE
SP-04-10
SHEET 1 OF 2
TC
ISSUED MARCH 29, 2011
FIRST VESSEL USED 44XX
TYPES OF ENGINE MIS-ALIGNMENT
NOTE;
CORRECT SHAFT POSITION IS PERMANENTLY ESTABLISHED
BY STRUT AND INTERMEDIATE TUBE BEARINGS,
THE ENGINE POSITION IS ADJUSTED TO ACHIEVE ALIGNMENT
TOP VIEWS
SIDE VIEWS
XX
XX
X
X
X
X
PORT AND STARBOARD DRIVELINES
ARE ANGLED OUTBOARD SO SHAFT
CAN CLEAR RUDDER/SKEG WHEN
REMOVED
A BENT STRUT (RARE) CAN
MISALIGN THE SHAFT BEARINGS
ALTHOUGH THE BEARINGS WILL MAINTAIN THE APPARENT SHAFT LINE,
ANGULAR ENGINE MISALIGNMENT WILL INDUCE BEND FORCES IN SHAFT,
COMPOUNDING STRESSES WITHIN THE SHAFT, GENERATING RUNOUT
AND CAUSING VIBRATION, POSSIBLE SEAL LEAKAGE, AND BEARING WEAR
ANGULAR MISALIGNMENT IN HORIZONTAL PLANE,
USE ENGINE MOUNT SLOTED BOLT HOLES TO
ADJUST ENGINE POSITION TRANSVERSELY,
MONITOR AND CORRECT AXIAL
DISPLACEMENT CONSEQUENCES
AXIAL MISALIGNMENT IN HORIZONTAL PLANE,
USE ENGINE MOUNT SLOTED BOLT HOLES TO
ADJUST ENGINE POSITION TRANSVERSELY,
MONITOR AND CORRECT ANGULAR
DISPLACEMENT CONSEQUENCES
SHAFT LINE IN VESSEL IS FIXED AND NOT ADJUSTABLE,
MAKE SURE SHAFT REMAINS APPROXIMATELY CENTRED
IN TUBE AT SHAFT SEAL, AXIAL MISALIGNMENT WILL
DIRECTLY AFFECT THIS PARAMETER.
CHECK WITH SEAL IN PLACE BY CENTERING SHAFT
WITHIN ITS FREEPLAY IN BOTH PLANES WITH FLANGE DISCONNECTED
ANGULAR MISALIGNMENT IN VERTICAL PLANE,
USE ENGINE MOUNT ELEVATION BOLTS TO
ADJUST ENGINE POSITION VERTICALLY,
MONITOR AND CORRECT AXIAL
DISPLACEMENT CONSEQUENCES
AXIAL MISALIGNMENT IN VERTICAL PLANE,
USE ENGINE MOUNT ELEVATION BOLTS TO
ADJUST ENGINE POSITION VERTICALLY,
MONITOR AND CORRECT ANGULAR
DISPLACEMENT CONSEQUENCES
AXIAL MISALIGNMENT MAY BE VERTICAL
AND/OR HORIXONTAL, SHAFT WILL
REQUIRE DEFLECTION TO MATE FLANGES,
FLANGES MAY SHOW NO GAPS AROUND
PERIMETER IF ANGULAR ALIGNMENT IS
REASONABLE
EVERYTHING WRONG,
TAKE A BREATH AND START OVER
WHEN ENGINE IS ALIGNED,
FLANGE REGISTERS MEET SQUARELY,
FLANGES SHOW NO GAPS AROUND
PERIMETER
ANGULAR MISALIGNMENT MAY BE VERTICAL
AND/OR HORIXONTAL, FLANGES MAY MEET
WITHOUT SHAFT DEFLECTION BUT
GAPS AROUND PERIMETER WILL VARY IN WIDTH
SHAFT FLANGE HAS MACHINED
FEMALE REGISTER TO ESTABLISH
AXIAL ALIGNMENT WITH TRANSMISSION
FLANGE
FLEXIBLE COUPLING HAS OPPOSITE REGISTERS
ON BOTH FACES TO CORESPOND WITH SHAFT
AND TRANSMISSION FLANGE
TRANSMISSION FLANGE HAS MACHINED
MALE REGISTER TO ESTABLISH
AXIAL ALIGNMENT WITH SHAFT
FLANGE
A FLEXIBLE COUPLING WILL TOLERATE SOME MINOR ANGULAR MISALIGNMENT,
R&D MODEL ILLUSTRATED WILL ACCEPT A .010" DIFFERENCE IN THE CLEARANCE
BETWEN THE RED PAINTED BOLT HEAD AND FLANGE FACE, MEASURED IN FOUR
POSITIONS AS THE COUPLING IS ROTATED. THIS CAN BE MEASSURED WITHOUT
DISCONNECTING THE FLANGES. SEE ALSO THE R&D LITERATURE.
FOR SMOOTHEST RUNNING EVERY ATTEMPT SHOULD BE MADE TO ACHIEVE
THE MOST ACCURATE ALIGNMENT REGARDLESS OF THE COUPLING TOLERANCE.
POSITIONING
BOLTS
HEIGHT
ADJUSTMENT
NUTS
MEAS
URE
ENGINE MOUNT POSITIONING BOLTS AND HEIGHT ADJUSTMENT NUTS MAY
WORK LOOSE RESULTING IN MISALIGNMENT.
CHECK ALL DRIVELINE FASTENERS FOR TIGHTNESS AT REGULAR INTERVALS.
