19
290 XF
Struts
The struts are the metal castings bolted to the bottom of the
hull to secure the aft end of the propeller shafts. A replaceable
cutlass bearing, also called a strut bearing, is used to minimize
shaft wear. The strut bearing should be inspected once a year,
or whenever the boat is hauled, to ensure that there has been
no damage or deterioration and that the strut bearing is not
worn excessively. Upon inspection of the bearing, a small
amount of play between the propeller shaft and bearing, .008”
to .010”, is normal. This gap allows water to pass between
the bearing and the shaft to lubricate the bearing surface. If
the rubber bearing shows signs of deterioration or excessive
wear, greater than .015” play between the bearing and the
shaft surfaces, the bearing should be replaced and you should
contact your Albemarle dealer. It is advisable, during lay-up
periods, to insert some castor oil into the rubber bearing to
keep it from “freezing” to the shaft. Never use machine oil or
grease on the rubber bearing.
THE OPERATION OF THE bOAT IN HEAVILY
SILTED OR POLLUTED WATER, WITH A DAMAGED
PROPELLER, A DAMAGED PROPELLER SHAFT
OR WITH THE ENGINE OUT OF ALIGNMENT, CAN
SIGNIFICANTLY SHORTEN THE LIFE OF THE STRUT
bEARING. IF YOU EXPERIENCE ANY OF THESE
SITUATIONS, THE bEARING SHOULD bE CHECKED
MORE FREQUENTLY.
ALWAYS CHECK THE ENGINE ALIGNMENT AFTER
REPLACING THE STRUT bEARING.
Propeller Shaft Alignment
The propeller shaft coupling and the transmission coupling
should be checked for proper alignment beginning with the
first launching, again after 20 hours of engine operation,
and annually thereafter. The alignment should especially be
checked if noise or vibration occurs.
Excessive vibration, abnormal strut bearing wear, or broken
propeller shaft coupling bolts are an indication of misalignment.
Misalignment can also cause severe damage to the shaft log,
strut, shaft and the engine transmission. Realignment should
only be performed by a qualified service person.
The correct procedure for checking the shaft alignment so a
boat owner can determine if service work is required, is as
follows:
Step 1:
Remove the bolts that secure the propeller shaft
flanges.
Step 2:
Hold the propeller shaft flange firmly against the
transmission flange.
Propeller Shaft Coupling
Step 3:
Try to insert a .004” feeler gauge at the top, the
bottom and at both sides between the flanges. If
it can be easily inserted between the flanges in
any area, try inserting a larger feeler gauge until
you determine the amount of variance.
Step 4:
While holding the transmission flange, turn
the prop shaft 90 degrees and repeat step 3. A
straight shaft in proper alignment will not allow
the insertion of a feeler gauge larger than .004”,
regardless of the prop shaft position.
Step 5:
If a gap larger than .004” is found and the gap
moves as the shaft flange is rotated, the flange or
the prop shaft is bent out of tolerance and must be
replaced or removed and straightened. If the gap
remains at the same position regardless of the
propeller shaft rotated position, the engine must
be realigned. At this point, an Albemarle dealer
should be contacted.
NOTE: The boat should always be at rest in the water
when checking or aligning the propeller shaft.
Propeller, Prop Shaft, Strut and Strut Bearing,
Summary of Contents for 290 EXPRESS FISHERMAN
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Page 119: ...119 290 XF Appendix C BOATING ACCIDENT REPORT...
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Page 134: ...Albemarle Boats 140 Midway Dr P O Box 349 Edenton NC 27932...