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Great White North
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Discussion Starter #1
Took, the jet out for a spin with a buddy today, and popped a frost plug! Came 1 inch from going under. We managed to find a sandbar to beach on before it went down. We didn't realize what had happened until the balancer started throwing water into the scoop and it started sputtering!

I am glad the lake was rough and we decided to turn around before we got too far out.

Alls well that ends well, I guess. Lesson learned.
 

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Not asking to be a smart ass at all. Just don't know the answer for sure but if you kill the motor wouldn't the water stop going through the motor or would the there still be water pushed through the jet from it being in the water anyway? Either way I'm glad you saved her.
 

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Water will go through the jet when the motor isn't running and water will go into the boat if the freeze plug it lower than the water outside the boat. In an emergency situation where you can't make the beach i would think that shutting the motor off, close the water valve to the motor, allow bilge pump to empty the boat and run the motor in shorts bursts to keep from over heating, might be a plan.

Hauling ass for dry land in a jet boat with a blown freeze plug is a gamble....the motor is not getting enough water to stay cool and the faster you go the faster the water fills the boat up....the more water in the boat the slower you go
 

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If he was really an inch from being swamped I would think that shutting it down would definitely have swamped him from the wave behind the boat. If he was underway that is. Glad you saved her though.
 

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Great White North
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Discussion Starter #5
Not asking to be a smart ass at all. Just don't know the answer for sure but if you kill the motor wouldn't the water stop going through the motor or would the there still be water pushed through the jet from it being in the water anyway? Either way I'm glad you saved her.
There was a very stiff wind going toward the middle of a 30 mile wide lake, there were white cap waves out in the main lake and we had taken a lot of water already. Made the quick decision to had for the sandbar. I also figured as low as I was in the water by then, the unknown leak might be below the waterline. As soon as the nose started to rise, buddy crawled out to the bow to get as much mass forward, so we never tried and find out where the water was coming from, as the the spray thrown by the harmonic balancer was flying!


I guess a finger inspection of the frostplugs isn't enough, I will have to to a tap test on them.
 

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Should have made your buddy put his hand over the hole!!! :)hammerslol just kidding:)hand How did you get it off the sand bar????
Wish you had some pics:)devil
 

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Great White North
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Discussion Starter #7
Should have made your buddy put his hand over the hole!!! :)hammerslol just kidding:)hand How did you get it off the sand bar????
Wish you had some pics:)devil
Once we got the water out, we just paddled back to the boat launch. I had only gone out about 1/4 mile then turned back. the sandbar was just inside the mouth of the sheltered bay the boat launch is in, so a 10 minute paddle.

Has or does anyone use the expanding rubber type plugs instead of the pressed in metal ones? I figured they might work well, seeing that the coolant temp is quite low versus a closed loop system.
 

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Once we got the water out, we just paddled back to the boat launch. I had only gone out about 1/4 mile then turned back. the sandbar was just inside the mouth of the sheltered bay the boat launch is in, so a 10 minute paddle.

Has or does anyone use the expanding rubber type plugs instead of the pressed in metal ones? I figured they might work well, seeing that the coolant temp is quite low versus a closed loop system.
I use a rubber expander on each side of my deal....but it's v-drive.....i wouldn't trust them past 25psi. Was your blown one a recent install? Or first run after winter? Is your block pressure regulated from the pump? It might be a good idea to figure out why that one failed and see if that cause applies to the rest of the plugs....just sayin:)devil
 

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Great White North
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Discussion Starter #9
I use a rubber expander on each side of my deal....but it's v-drive.....i wouldn't trust them past 25psi. Was your blown one a recent install? Or first run after winter? Is your block pressure regulated from the pump? It might be a good idea to figure out why that one failed and see if that cause applies to the rest of the plugs....just sayin:)devil
Yeah, first time out since putting in that one and one on the other side. When I left Arizona in March to come back to Northern Canada, couldn't get the drains out (they looked like they were never out before), so popped one plug out on each side. I was certain they were in properly, but I guess not. They were steel instead of the original brass. Can I re-use the brass ones, they still look perfect?

The there is no pressure regulator or throttling valve. I have been thinking of putting in one and a guage, as I ride in cold water most of the time.
 

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Yeah, first time out since putting in that one and one on the other side. When I left Arizona in March to come back to Northern Canada, couldn't get the drains out (they looked like they were never out before), so popped one plug out on each side. I was certain they were in properly, but I guess not. They were steel instead of the original brass. Can I re-use the brass ones, they still look perfect?

The there is no pressure regulator or throttling valve. I have been thinking of putting in one and a guage, as I ride in cold water most of the time.
Pressure reg. might e a good idea....car motor runs 20 max...that's more a function of keeping the radiator happy. I see quite a few motors that run straight pump pressure to the motor and don't have problems and it's usually BBC On fords and olds they have the front cover issue than can leak under the higher pressure.....but im thinking that running more than 40psi on any motor might be the expensive way to find out the intake gasket wasn't up to the pressure and the x-over just pumped 4 gal. of lake into your oil....20 psi might only be 2 gal and you might catch that on a pre-run check....
And yep..more parts to buy and fail.....i work on jet boats yet i run v-drive...and they have their issues to...usually just impellers and pieces.
Moved from az. to Norther Canada? YOW! Poor boat is all confused now:D I moved from utah to az...never even thought of a boat till i moved here!

And probably not a good idea to re-use freeze plugs...if it works fine...if it doesn't, i heard it can fill a jet boat with water plenty quick:p
 

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Re use?

In my experience, freeze/soft plugs are a one time shot. The brass/steel actually compresses down upon installation, so even if they "look" great", they're a little undersize. I guess you could carefully mic a new one against the used ones to verify actual size.... IMO, it is cheap insurance to replace them, and use BRASS!! Not steel, and definitely not the rubber expandable type.

Ray
PS I have two in a block that were partially pushed out??? Not sure why? I really can't believe I was anywhere cold enough to freeze what little water was left in the block, but they will be replaced with new brass before any further use....
 

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Ray.....if you didn't pop at least one freeze plug to drain the block it probably did have enough water to push one out. Cold enough? Did you forget last winter? I think it went mid 20's a couple times here. And now that i think of it they do change shape when ya pound them in. Most everybody hammers them in with a driver or a socket and it takes a few good wacks to get them in. I have replaced some on front wheel drive cars...side of the motor next to the trans...The slide in really easy with a big screwdriver and a socket....I'm still trying to figure out how op
got one out without mangling it...
 

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"freeze plugs" is a misnomer for casting plugs. Their purpose is to let the sand out after the block is cast. I can attest that they sometimes pop out when water freezes in the block, but I can also attest that they do not save the block from cracking. I fish all winter in New England so I swapped out the pipe plug drains for ball valves. I had a block not fully drain between trips in my jet, and a freeze plug pushed out and the ice still cracked the water jackets on one side. Engine still ran fine, just water giugging into the boat while running. When it was off it stopped. We fished all day on trolling motor and used the engine sparingly. I only had a single 1,000 GPH bilge pump then. Since then I've added a second pump rated at 4,000 GPH mostly to pump out after spearing large waves on big water. I can see where you could get past the point of no return, and many boats over 20' don't have floatation or big bilge pumps. Anyone tack weld freeze plugs or use threaded ones? No advantage to having them loose (pressed in). Will brass and iron weld? We welded up the cracks (and made some new ones) and JB Welded the tiny leaks and got two more years out of that SBC engine.
 

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So like freeze plugs start out as sand drains and then they turn into cracked block indicators....like on thanksgiving turkey that thing that pops out when it's done....or still might have 2 years left depending on the budget and craftiness of the owner:))THumbsUp:wink2:
Got it...i think...lol
 

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Yeah, in the desert....

Ray.....if you didn't pop at least one freeze plug to drain the block it probably did have enough water to push one out. Cold enough? Did you forget last winter? I think it went mid 20's a couple times here. And now that i think of it they do change shape when ya pound them in.
Yeah, in the desert, but that boat hadn't been wet for 12-18 months before it came to Bullhead. It sat here in Newbury Park forever and there was no way it froze that hard here... As I think about it, more and more, I'll really look the lower ends of the cylinders over for sleeve type separation in the corners. Another thing, it wasn't the lowest plugs, it was the center plugs that are an inch or two higher than the end ones.... I did have it wet at CFW over New Years one year, but it was mostly raining that weekend, and all the way home to NP. I think it's highly unlikely it was raining and freezing at the same time.....I just can't see where it had any chance to see freezing weather over a long enough period of time, (hard freeze), while there may have been standing water in the block... Maybe a bad fit to begin with, and too much jet pressure?? Hard to say, but I'm definitely looking it over with a bright light, and a jewelers loop before it goes back together...Maybe even a quick mag at the local shop. I guess they can't screw it up too bad doing that only....And, it's so clean it shouldn't need any hot tanking....
Sorry for the thread jack...
Ray
PS Oh, and the block drain petcocks are lower than the freeze plugs for draining, but I didn't see any reason to suck it totally dry...
 
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