I'm refurbishing my stuffing box.
Last season was the first time I had the boat
in the water
and the stuffing box leaked more than I would like (1Drip/second). No amount of tightening would stop it.
I have the shaft coupling off and the box off. But I'm not sure what size packing to order ? I thought it would be a simple calculation: stuffing box i.d. - shaft o.d. / 2. But looking at the packing nut makes me wonder.
The nut where the packing goes is only partly threaded, see picture, so there is the thread i.d.(1-7/8") and then the larger i.d. where there is no thread(2"). The un-threaded space is 3/4" long. The shaft is 35mm (1-3/8") (whole boat
is an annoying mix of metric and imperial).
The failed packing seems to be 3* 1/4" flax packing with a wider ring of green goo (syntef?) between the first and second rings. So one of the flax rings was compressed more by the threaded part of the nut.
I'm thinking of using Gore GFO packing.
I think I could put 3 rings of 5/16" packing into the nut and then slide it onto the shaft since I have everything apart, but what about replacing it on the shaft? Will I be able to push 5/16" packing through the 1/4" space between the threads and the shaft ?
Would 3 rings of 1/4" compress enough to fill the space ?
The box also has a grease fitting aft of the packing.
Any thoughts welcomed.