Hey all, this past weekend I ran my new motor, after splash, I hand tightend packing nut, it was leaking pretty good, then ran engine at the slip very briefly, had a drip going and off.
When you say "ran engine at the slip," do you mean just running the engine, or were you turning the prop, as well?
I tightened a little more drip stopped.
Depending upon the answer to the above question: That may've been good, or may not.
I left the dock, motored for maybe, 1-3/4 hrs, had a good drip going, all seems well.
Define "good drip going." For Gore GTU or GFO packing material that can be up to one drip every 20 seconds. For traditional material: One drip every ten.
The drip from the stuffing box was a blackish color.
Assuming you're not in "blackish coloured" water: That's bad. That indicates something is wearing/burning. (N.B.: Gore GTU or GFO may result in some gray-ish-ness initially. After all: It's carbon impregnated material. But the drip should soon turn clear.)
During the install of the shaft and cutlass brg ( all rubber) I was concerned it was a little to tight,
This is a separate issue. The stuffing box is inside
your boat, above the shaft log. The cutlass bearing is outside
your boat, well below the shaft log and in the water. How would wear from the cutlass bearing reveal itself in the drip from the packing gland?
I shot some WD -40 in the openings of the cutlass brg b-4 launch, probably should not have,
No, you shouldn't have. Petroleum products are generally
not recommended for rubber or plastic parts.
See above. With the prop shaft turning you should get one drip every 20 seconds or less when using Gore GTU or GFO packing material, one drip every 10 seconds or less using traditional material. Also, the stuffing box should not get hot to the touch. Shouldn't get more than lukewarm, at the most. Any drip rates lowier than those, or a very warm or hot stuffing box will not only mean premature wear on the stuffing material, but you may score your prop shaft, after which you'll go thru stuffing material like, well, like water.
Btw: IME the Gore stuffing box material can take a lot of abuse w/o damaging it or your shaft. The first season I had it in, season before last, I was trying to get near the "optimal" one-drip-per-20-seconds adjustment. Couldn't get it. If I tightened just a hair
past the per-10-seconds rate, the drip would stop entirely and the stuffing box a couple of times got down-right hot
to the touch! So I settled for the 10-second rate. This spring we had the hose coupling the stuffing box to the shaft log replaced. The mechanics that did that job said the stuffing material and shaft were in fine shape.