Update. Hauled. Shaft sent out and made true. Propeller
sent out and balanced. Cutlass bearing replaced. Engine realigned. One coat bottom paint
while we're at it. Back in the water
,and much, much better. Some of the time, no noise
at all. But below 900 rpm
and over 1500 rpm
, definite noise
. Kind of a tapping in the shaft tube, frequency consistent with rpm. Hauling out again next week, will install another bearing on inboard end of tube and hope that does it. After aligning the engine again. Shaft is currently supported only at the coupling and the cutlass bearing, as dripless packing does not provide the support a packing gland
did. Shaft is over 7 feet long, so another bearing should help (I think this is better than a pillow block as the bearing will be further aft (aft of the dripless packing) and we really don't have room for a pillow block.
area is very hard to get to (hence the move to dripless). Must remove batteries. Ugh. But must be done.