Transmission Troubleshooting - Westerbeke 44A FOUR-35 C THREE Operator's Manual

TRANSMISSION TROUBLESHOOTING
I
CONTROL CABLES
The majority of transmission difficulties arise as a result of
improper clutch adjustments (manual transmissions) or
problems With control cables (hydraulic transmissions)
rather than from problems with the transmission itself.
PRM clutches, in particular, are very sensitive to improper
cable adjustments.
If you experience operating problems with the transmission,
shut the engine down. First check the transmission-fluid
level, then have a helper move the cockpit shift lever through
the full range - from neutral to full forward, back to
neutral, into full reverse, and back to neutral - while you
observe the actuating lever on the transmission. If the remote
is stiff to operate, break the cable loose at the transmission
and
try
again. If it is still stiff, check the cable for kinks or
excessively tight bends, and check any linkage for binding.
Problem Probable Cause
Transmission gears cannot be shifted. 1. Actuating lever is loose.
Fails to move into gear.
2. Shifting cable is broken, bent or
A new cable and perhaps a new linkage mechanism may be
needed. While the cable is loose, shift the transmission in and
out of gear using the lever on the side of the transmission to
make sure there's no binding inside the case.
If the transmission passes these tests, crank the engine and
have a helper put it in forward and reverse while you observe
the propeller shaft; if the shaft isn't turning, the transmission
needs professional attention. If it does
turn
but there's no
thrust, check to see you still have a propeller on the end of
the shaft or, if you have a folding or feathering propeller,
that it isn't stuck in the "no pitch" position.
NOTE:
If
you suspect a major problem in your transmission,
immediately contact your WESTERBEKE dealer or an
authorized marine transmission facility.
Verification/Remedy
1.
Tighten damping bolt on shifting lever.
2. Check the cable, reattach or replace.
unattached. Cable radius is too severe.
3. Shift lever is binding against cover plate.
Transmission shifts into gear,
1.
Output coupling is not tuming.
but fails to propel the boat.
2. Propeller shaft is.not turning.
Output coupling is tuming.
3. Output coupling and
propeller shaft are turning.
Delay of gear engagement or engages 1. Lever travel N to B not equal to N to A.
only after an increase in speed. Refer to diagram.
2. Shift level travel in insufficient.
3. Shift lever is binding against cover plate.
Transmission noise becomes louder.
1.
Damage starting on flexible coupling due
to wear or fatigue, possibly due to
misalignment between engine and
driveshaft.
2. Beginning damage of bearings in
transmission due to torsional vibrations,
running without fluid, overload, wrong
alignment of transmission, or excessive
engine output.
Chattering transmission noise,
1.
The engine or propeller generates torsional
mainly at low engine speed. vibrations in the drive unit which produces
a ·chattering" noise in the transmission.
Boat fails to attain specified max. speed. 1. Operating temperature is high.
2. Operating without cooling.
Oil Leakage.
1.
Corrosion at radial sealing ring and shaft.
Damaged sealing
ring.~
2. Misalignment of output flanges.
NOTE:
If
you suspect a major problem in your transmission,
immediately contact your WESTERBEKE dealer or an
authorized marine transmission facility.
3.
1.
2.
3.
1.
2.
3.
1.
2.
1.
2.
1.
2.
1.
2.
Engines & Generators
47
Detach the shift cable and operate the lever by hand.
Clearance should be 0.02 in (0.5mm).
Transmission needs professional attention.
The coupling bolts are sheared or the coupling is Slipping
on the propeller shaft. Tighten or replace set screws, keys,
pins and coupling bolts as necessary.
Inspect the propeller. It may be missing or damaged.
A folding propeller may be jammed. A variable pitch
propeller may be in "no pitch" position.
Adjust cover plate until the lever is exact mid-position.
Refer to SHIFT LEVER TEXT AND DIAGRAM.
Check shift lever cable length. See SHIFT LEVER DIAGRAM.
Check clearance, adjust if necessary.
Check alignment, inspect flexible coupling. If noise persists,
inspect the damper plate between the transmission and the
engine. Replace if necessary.
Transmission needs professional attention.
Mount a flexible coupling with another stiffness factor
between the transmission coupling with and the driveshaft.
A higher stiffness factor might be sufficient.
Inspect the damper plate between the engine and the
transmission. Replace if necessary.
Wrong type of fluid. Use ATF. Check fluid level.
Check cooler. Inspect coolant hoses and coolant flow.
Transmission needs professional attention.
Check alignment. Must be within 0.003 in (O.OBmm).