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Old 06-15-2004, 07:45 AM
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Default how much water is normal??

You guys have been a real helpful so I thought I would run this by you. How much water is normal to come out after a full day on the lake when you pull the drain plug. 18 ft lund fisherman? I have been getting about 8 or 10 gallons out maybe 15. is that too much and where do you think it may be comming from?
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Old 06-15-2004, 08:09 AM
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Default RE: how much water is normal??

Unless you have been sailing rough waters and taking in water over the top it has to be coming in thru the bottom. Leaky rivets would be my first guess, thru hulls would be the second guess. It is not a lot of water to have in an 18 foot boat as long as the leak doesn't get any worse. If it does all bets are off and if a big enough passageway opens it could be enough to sink the boat.
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Old 06-15-2004, 08:17 AM
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Default RE: how much water is normal??

Seems like 15 gallons is alot. I would think that amount would float the switch on the bilge pump. My experience with my boat is that very little (less than 1/2 gallon) ever comes out of my bilge.

What type of boat is yours? I did have a problem with my livewell where the water wouldn't drain as fast as it was pumped in and the extra water would drain over the sides of the well and into the bilge. The bilge pump would pump that water out but would always leave that little bit that the pump couldn't get.
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Old 06-15-2004, 08:23 AM
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Default RE: how much water is normal??



I 'd have to say 15 gallons is too much for a day on the lake and warrants investigating the source. It could be as simple as a leaky drain plug.

Good luck.

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Old 06-15-2004, 08:33 AM
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Default RE: how much water is normal??


Jason,

If the boat is rivoted, take a look and try to figure it out, but if you can't, don't worry about it - probably just a weep from the rivots, even 20 gallons in 8 hours is nothing - that's barely enough to even pump out when it's spread out across the whole hull. All I'd do is take a crawl around underneath to be sure there's not anything ugly, and would check any through-hulls.

If you don't have sufficient bilge pumps, time to install a couple. Better to err on the safe side, although (and don't rely on this) that boat probably cannot be sunk (could sink low enough to damage an engine though). I allways install a pair of the square 1000 GPH rules, they are very compact, and work well. Cheap piece of mind. Most boat manufacturers only install 1 insufficient pump, fine for rainwater, in any sort of emergency you better have an extra set of hands for a bucket .

That's rivoted boats, great boats, strong light maintainence-free hulls that tend to last 30 years or more, but right out of the factory, many leak a bit, just a "feature" of that style construction.

Just whatever you do, don't try and fix a leak with caulk, epoxy (gluvit doesn't work despite claims), or anything of that nature - doesn't work and makes it worse as the sealant will hold water, which corrodes the aluminum, which makes the leak worse. I tried it. Rule is ignore, tighten, or replace - those are your options.

Amazingly though, the 1973 16 ft. starcraft I refurbed to a CC recently doesn't leak.. probably will at some point.. my 21 ft. starcraft did leak, probabably 40 gallons an hour on a bad day, lots of little leaks.

If you manage to find rivots that are actually loose somewhere, those are the cause. You've got two choices, both involve getting to the backside of the rivot in question. Either tighten or replace it. Takes two people. To tighten it, place a heavy object on the outside, bash it on the inside. To replace, either get the special tool they use to install them, or get some truss head fine thread stainless phillips head bolts, nylon lock nuts, and aluminum washers. Put a washer w/ blue RTV on each side (protects the hull from any potential corrosion caused by mixing metals), and put the truss-head through, just be sure not to over-tighten if there are any gaps in the material you are fastening, as it'll dimple.

If the boat is welded, take a harder look at it, could be a failing weld somewhere that might open up... could just be an imperfection in the welds too.

Jon
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Old 06-15-2004, 08:58 AM
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Default RE: how much water is normal??

If it's just sitting in the bilge, as soon as you bring the boat up on plane, the water should run back to the bilge pump and float switch and it should get pumped out automatically. If you have 15 gallons that seems to always be there every trip, something is leaking, but why isn't it getting pumped out?
When most boats are at rest, the bow sits a little deeper in the water than the rest of the hull so that is where the water usually runs to and hides, so even though that's where the water is it doesn't mean that is where the leak is.
15 gallons isn't that bad, but how long does it take to get to that amount? In an 18' boat, 80+# of extra, water/weight could make a difference in how the boats rides or handles, especially when taking boat wake to beam.
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Old 06-15-2004, 09:54 AM
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Default RE: how much water is normal??

Probably a leaky bolt thru the alloy transom, most likely the lower bolt thru the engine bracket.

Tilt boat down at rear with OB fully raised, (I do this by parking with rearwheels of tow vehicle parked atop an incline (small hill).

I LEAVE the boat coupled to the tow bar (with chains as well), and just lower the jockey wheel to raise the srprings of the tow vehicle.

Then put the hose in the transom and turn it on.

When it fills to the lower engine bracket bolt holes - you'll see if it's leaking thereby water comming out!.

Likewise you'll find any other small leaks underneath.

NB - I'm NOT advocating filling the whole goddamn bioat with water while on the trailer- that would be foolhardy. I DO chock my trailer and tow vehicle wheels with wood when ding this test.

Most likely your boat doesn't injest any water while sitting level in the water or while on plane if the waters comming in thru transom lower engine bracket bolt hole, but Likely when you pull the nose up the beach for half the day - is when you get the transom low enough to injest some water thru those holes.

It's NOT as easey to seal an alloy transom engine mounting bracket holes as a glass/ wood transom - it can take a few goes with the goop to get it right!

Usuallu the transom is twin skinned in alloy meaning getting goop to STAY around the bolt body as it passes thru BOTH inner and outer skin holes is tough...

Cheers!

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Old 06-15-2004, 10:12 AM
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Default RE: how much water is normal??

That's a bunch.. I normally get about a cup from being on the water all day with swimming and the like... Some of that water is probably condensation from the cooler too. If I had 15 Gallons come out, I'd freak.. That's 100 POUNDS of water in there!

Sounds like you got a small leak in there...
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Old 06-15-2004, 11:43 AM
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Default RE: how much water is normal??


Can someone verify what type of hull this is we are talking about? It's aluminum, is it rivoted or welded. What's the transom made out of?

If it's rivoted, I'd put my $$ on it being a leaky rivot or two every damn time, not a big deal, and neither is 15 gallons over 8 hours - that's 2 gallons an hour. I've heard complaints of new rivoted boat owners about those sorts of weeps.

As far as the transom bolts. Is this transom just aluminum? I guess I might be able to see it, but when you've got something through-bolted with washers and sealed with 5200, I just don't get how it would be hard to seal.

Jon
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Old 06-15-2004, 12:22 PM
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Default RE: how much water is normal??

Quote:
jasontrucks76 - 6/15/2004 7:45 AM

You guys have been a real helpful so I thought I would run this by you. How much water is normal to come out after a full day on the lake when you pull the drain plug. 18 ft lund fisherman? I have been getting about 8 or 10 gallons out maybe 15. is that too much and where do you think it may be comming from?
You've got a leaky rivet. My old Lund used to do that too. I took it back to the dealer, where they fixed the problem. Had that boat close to 20 years without any further problems.
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Old 06-15-2004, 02:05 PM
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Default RE: how much water is normal??

Ok now Im getting some ideas to check! Keep in mind that Im new to all of this and Ill try to discribe as best I can. I just got the boat Friday and had it out 3 times this week end and each time I loaded it I pulled the plug and water came out. Friday when it happened I thought it may be the plug so I put in a new one. Sat. the water was verry rough and I took some over the back so that would explain sat. water. But sunday I went out just fishing with one other person and the only time the water came close to the back was when I was realing in from the back and standing bolth of us too far back and when I came to a stop from a fast pace the water would splash some but not enough to come passed the transome(spelling?) their are 2 drain holes where I assume water is supposed to splash from time to time. On all the above days when I turned the bilage pump on I only got a small amout of water out like a few cups. But when I put the boat on the trailer and pulled the plug quite a bit ran out. The amount Im not shure I am thinking was around 10 gallons or so I stood and watched it come out and tried to think it filling a 5 gallon bucket. the boat is a 98 Lund with a rivited hull all alluminum with two live wells and I checked the live wells and I dont think it is comming from there. but like I said when the boat is sitting in the water their is bairly enough for the pump to get ahold of. So I was just wondering if I should be worried?
Thanks everyone
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Old 06-15-2004, 08:00 PM
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Default RE: how much water is normal??

I've got a 24 foot boat and if I end up with 1 or 2 gallons at the end of the day that's a lot. If you are getting 10-15 something is not right, and you should take the advice given and get it to a dealer where they can fix the problem.

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Old 06-15-2004, 08:42 PM
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Default RE: how much water is normal??

Put a 5 gallon bucket under the drain and see how much you really get on a bad day.
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Old 06-16-2004, 05:28 AM
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Default RE: how much water is normal??

glacierbaze is right...measure the water in a bucket....what you describe sounds excessive....a guy who works on fishing boat reefers observed that automatic bilge pumps have sunk more boats than any other single cause....you take them for granted and don't pay attention to leakage rates....the pump clogs or fails while the boat is unattended, and it sleeps with the fishes!......also run it a while with the livewells empty to eliminate them as a source.....i'll put my money on a rivet.....
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Old 06-16-2004, 11:13 AM
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Default RE: how much water is normal??

I don't have an aluminum boat so can't speak from experience, but if I had 5-10-15 gallons of water in my bilge, my bilge pump would come on and pump the water out into the lake. The only time I get enough water in the boat to have the auto bilge pump operate is when I am washing it down and put a lot of water in the bilge from the hose, except for the time I "dove" into the back of a 4' or so wave and splashed a bunch of water into the rear of the boat. My trolling motor gas can was floating and the bilge pumped water from the lake for about 15 minutes until we got the boat out of the water and on the trailer and pulled the plug. I would be very worried about that much water in the boat if it was mine.
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Old 06-16-2004, 08:22 PM
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Default RE: how much water is normal??

While at my dentist the other day, he described the same thing that was happening to his boat after being out on the lake.Eventually he found it to be caused by water being forced thru the bilge pump in theopposite direction ,while he drives his boat in reverse. It seems his discharge hose pumpout fitting for the pump is located on his transom, instead of on the port or starboard side near the stern. Where is your fitting located?
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