@drewkaree I am out on the boat now and took a look. The overhang is anywhere from 1 1/4" to 1" of overhang actually.
Excellent to hear, if that holds true for my boat, I won't have a lot of wasted material!
I bought this gasket, and I was questioning if I should have gone with 3/4" width. I think my original plan was to put it on the underside, right up to the edge of the cleanout tray, to seal as much as possible. Supposedly, that neoprene will be enough to at least severely limit water leakage, if not stop it altogether. Great info to have, thanks!
Dumb question here. When you reseal or caulk the two access panels, where does the water that comes in go? Does it go through the small hole next to the access panel? If so, does that hole lead to the bilge? (Asking for a friend who had an active bilge pump last year when underway.
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The water is SUPPOSED to drain back out through that small hole. That small hole is the entire reason you get water in that area in the first place. There's a hose connected under the cleanout tray to that "small hole" (hose fitting) for all the water to enter and drain. I've seen some pics on here of newer 19' boats that don't have the drain hose, and simply have a "gutter" molded into the edge of that tray for any water to simply drain out of that area onto the lower swim deck. As far as I can tell, adding the hose seems like it would allow that area to drain, so good idea Yamaha, but in actual real-world use, it ADDS a way for water to enter our boats. The molded "gutter" is the better solution, IMO.
You likely had water entering your bilge thanks to the crap sealing of the cleanout tray. Here's how fast it comes in on my boat - in addition, the raised lip on the drain KEEPS water in that area until it leaks through the crap seal:
Port side lean, and how bad the seal is on that side:
Even with a lean to port, it still leaks on the starboard side, showing how poor this area can be:
Two other items I've contemplated: Looking at plenty of broken plastic scupper valve threads makes me question the sturdiness of it and whether a metal replacement would be a better idea. Decision to be made when work is attempted. The other item, when I pull the cleanout tray, I may consider taking a Forstner bit to that drain tube fitting area if it's a common size, just to drop it a bit lower and allow more water to drain from the area. If it's too thin, then it's a no-go, but even taking a touch off the tray panel will get rid of more water than what currently happens.
This whole area seems to either be a non-issue, or one of the larger areas of water intrusion on these boats. If I had any fiberglass skills, I would seriously contemplate cutting and forming the "gutter" to drain to the lower swim deck, and just seal up that dang drain altogether. Corking it has resulted in zero water intrusion for some on here, so to my mind, that's proof positive that there's absolutely no reason for this design flaw, and eliminating it altogether would be preferential.