Mercury BRAVO Service Manual page 37

SERVICE MANUAL NUMBER 28
Drive Shaft Housing Noise (Continued)
Worn U-joint shaft splines and/or
engine coupler splines.
Engine alignment incorrect or engine
coupler crooked.
Gimbal bearing rough.
Loose gimbal bearing.
Gimbal bearing not fully seated in
gimbal housing.
Excessive clearance between gimbal
ring and gimbal housing. This could
cause misalignment between bell
housing and gimbal housing and also
may allow gimbal ring to vibrate up
and down.
Improperly installed or failed rear
engine mounts. This will affect engine
alignment, but usually is not detectable
with engine alignment tool.
90-863160 MAY 2000
Cause Special Instructions
Remove U-joint coupling end yoke and
insert into gimbal bearing and engine
coupling. Rotate shaft back and forth.
If play is excessive, replace U-joint
coupling end yoke and/or engine
coupler, as necessary.
Adjust alignment. Ensure that
alignment tool moves in and out of
coupler freely. After proper alignment
has been obtained, check for a crooked
coupler by rotating engine coupler 1/2 turn
and rechecking alignment. If
proper alignment is no longer
observed, coupler is crooked and must
be replaced. (Refer to SECTION 2)
Replace gimbal bearing. (Refer to
SECTION 4)
IMPORTANT: Gimbal bearing and carrier
MUST BE replaced as an assembly be-
cause they are a matched set. Failure to
do this may result in a loose bearing fit in
carrier.
Reinstall bearing assembly using a new
tolerance ring if carrier is loose in
gimbal housing. If bearing is loose in
carrier, bearing assembly must be
replaced. (Refer to SECTION 4)
Drive bearing assembly into place.
Check and adjust clearance. (Refer to
SECTION 4)
Check for uneven mount height, or
loose or soft mounts. Make sure there
is clearance between flywheel housing
and fiber washer. If no clearance exists,
mounts have probably sagged. Install
mounts correctly or replace, as
necessary.
TROUBLESHOOTING
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