A classic symptom on this engine. It is the dry actuating rods of the
trim/tilt cylinders pushing on the rod landing pads. Keep them lubed and
your're back in business.

Rob
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"tom clark" wrote in message
om...
When I trim my 90HP Merc up or down I hear an intermittent snapping,
grinding, crunching noise ( hard to describe). The trim pump fluid
level is fine.

Any ideas?
Thanks