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Old 26 September 2012, 20:30   #1
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Willard 730 - Bilge Water

Hmmm....I always end up with some water in the bilge after taking the boat out. I seems to be about the same amount whether the boat is in the water 3 hours or 3 days. My initial thoughts: outdrive (bellows?), drain plug, or raw water intake (either at the sea cock or the pump end). I replaced my raw water pump a couple of weeks ago so that eliminated one option!

Last week, before heading out, I vacuumed out any remaining water that didn't drain through the plug and gave the bilge a good cleaning. Upon launch, I left the bilge hatch open, left the boat on the trailer, climbed aboard, and watched for any water trickling in...

Well, it was not from the suspected sea cock, outdrive, or drain plug! There was a trickle of water from two half moon shaped drain holes on either side of the transom box that seemed to be flowing at the same rate. These holes drain the void on the outer 1/3 of each side of the hull.

Question: Do the bolt holes (for attaching the tubes) go all the way through to this void and could this be the source of the water??? (when putting on the tubes, I WAS able to put a screwdriver all the way into the hole)

If so, I would probably pull out each bolt and dab some bathroom silicone on it and put it right back in...heck, I'd probably only have to the back half of the hull.

If it's not the case....I think I have bigger issues!

[not by bilge, I just stole the picture from a for sale thread]
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Old 27 September 2012, 14:29   #2
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Where do the drain holes drain to? Into the motor bracket? If so, I'd switch your focus to seeing why water is getting in there.

jky
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Old 27 September 2012, 14:38   #3
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I'll check my hull tonight when I get home (since it in pieces) but I think you might be right. The tube bolt holes don't have a back and they lead to the void between the bilge walls and the outer hull. I've never run mine so I don't know if that's normal. did you look to see if any bolts are missing?

jason
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Old 27 September 2012, 14:46   #4
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Where do the drain holes drain to? Into the motor bracket? If so, I'd switch your focus to seeing why water is getting in there.

jky
Hull is divided into ~1/3's with two longitudinal stringers. The middle section is the main bilge - engine, fuel tank up front, batteries, drive shaft, misc items. The two outside sections are basically closed off except for some small drain holes. I was told that they are empty voids (someone actually cut in there to gain access to put a backing plate for a deck mounted accessory).

The drain holes I am pointing at in the picture drain from the outside areas to the center area. Only the two that are closest the transom had a trickle of water coming out because only the last 5-6 ft of boat are in water while on the trailer just prior to launch. I/O wasn't leaking and neither were the two through hulls
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Old 27 September 2012, 14:48   #5
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I'll check my hull tonight when I get home (since it in pieces) but I think you might be right. The tube bolt holes don't have a back and they lead to the void between the bilge walls and the outer hull. I've never run mine so I don't know if that's normal. did you look to see if any bolts are missing?

jason
Thanks. I haven't had time to pull a bolt and stick a hose up to it but that's my next test!!! (I just had to ask on here because I thought someone might know or have had the same issue)
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Old 27 September 2012, 16:00   #6
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and dab some bathroom silicone on it
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Old 27 September 2012, 16:29   #7
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I wouldn't think that 5200 or Sikaflex would be the right choice. I want to be able to remove them!!! I just need to a make the screwholes a bit more watertight. What's your suggestion????
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Old 27 September 2012, 16:40   #8
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yeah, all my bolts had anti-seize on them. I think corrosion is more of a concern than a bit of water. How much water do you get? gallons or tablespoons?

I would check to make sure you haven't lost a mounting bolt. It's seems that even loose it's not a real big area for water to flow through. also check the backside inserts. The inserts screw into the hull themselves. I had one or two frozen bolts that ended up taking the insert out of the hull.

For a guy that's never actually run his boat it's weird I'm offering advise. But I am currently very familiar with all 140 or so of those bolts

jason
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Old 27 September 2012, 16:55   #9
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yeah, all my bolts had anti-seize on them. I think corrosion is more of a concern than a bit of water. How much water do you get? gallons or tablespoons?

I would check to make sure you haven't lost a mounting bolt. It's seems that even loose it's not a real big area for water to flow through. also check the backside inserts. The inserts screw into the hull themselves. I had one or two frozen bolts that ended up taking the insert out of the hull.

For a guy that's never actually run his boat it's weird I'm offering advise. But I am currently very familiar with all 140 or so of those bolts

jason
Thanks. I too am intimately familiar with my bolts too as I changed my tubes last December! I didn't have a problem getting any of mine undone and the inserts are all sold.

It might be a gallon or so. It's not much be it happens in the first two minute of the day and then the water doesn't ever rise. And, the way Willard placed the bilge pump about 1/3 of the way forward of the transom, the water doesn't even come close reaching the pump.
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Old 27 September 2012, 17:42   #10
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well you have exhausted my experience. I'll look for water next year when my boat sees it again but you'll probably figure it out by then

Jason
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