Hydrolocked my motor
#1
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Thread Starter
Hydrolocked my motor
I was warming up my motor yesterday on the hose (HP500 carb, sort of) running it at about 1500 rpms, brought it down to idle for a few seconds ready to shut it off, and it start knocking badly and locks up
After i cleaned my shorts and stopped crying, I decided to pull the drive. Drives fine. Took out all the plugs, fine. Oil is clean. So while taking off the manifolds (Merc/Gil), I notice the port side manifold runners have water in the bottom of the runners, all 4 of them. I assume the manifold is cracked.
My question is, how are these pressure tested? I plugged up the outlets and clamped a garden hose to it. I have about 80 lbs here at the house, but I can't make it leak, they look fine.... Where the hell did that much water come from?
After i cleaned my shorts and stopped crying, I decided to pull the drive. Drives fine. Took out all the plugs, fine. Oil is clean. So while taking off the manifolds (Merc/Gil), I notice the port side manifold runners have water in the bottom of the runners, all 4 of them. I assume the manifold is cracked.
My question is, how are these pressure tested? I plugged up the outlets and clamped a garden hose to it. I have about 80 lbs here at the house, but I can't make it leak, they look fine.... Where the hell did that much water come from?
#3
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Is this a new engine? Meaning, did you just put it in the boat? Is it possible that it is reverting water, or has this engine been in the boat for some time?
The riser may be leaking. You really can't pressure test them, but you can run water through it and still check it for leaks. You also need to pressure test the engine basically the same way you tested the manifold.
Eddie
The riser may be leaking. You really can't pressure test them, but you can run water through it and still check it for leaks. You also need to pressure test the engine basically the same way you tested the manifold.
Eddie
#4
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Thread Starter
Is this a new engine? Meaning, did you just put it in the boat? Is it possible that it is reverting water, or has this engine been in the boat for some time?
The riser may be leaking. You really can't pressure test them, but you can run water through it and still check it for leaks. You also need to pressure test the engine basically the same way you tested the manifold.
Eddie
The riser may be leaking. You really can't pressure test them, but you can run water through it and still check it for leaks. You also need to pressure test the engine basically the same way you tested the manifold.
Eddie
#5
I'd bet the riser/elbow went bad. What did the manifold/riser gasket look like?
If not those, then the only other answer is reversion. You could have hit some harmonic holding it at 1500 that sucked water down, but the exhaust pressure kept it from entering the exhaust valve. Once you dropped back to idle, there would have been much less exhaust gas velocity coming out of the cylinder, with the exh valve staying open longer, allowing it to flood.
If not those, then the only other answer is reversion. You could have hit some harmonic holding it at 1500 that sucked water down, but the exhaust pressure kept it from entering the exhaust valve. Once you dropped back to idle, there would have been much less exhaust gas velocity coming out of the cylinder, with the exh valve staying open longer, allowing it to flood.
#7
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If it has 40 hrs without any reversion, then it about impossible that it just developed it for no reason.
Did you maybe have the tongue of the trailer really low, which would have changed the tailpipe angle? That could cause water to run up the pipe if you were normally really close to reverting. It wouldn't take much to send it over the edge if it was close. Just a thought.
Eddie
Did you maybe have the tongue of the trailer really low, which would have changed the tailpipe angle? That could cause water to run up the pipe if you were normally really close to reverting. It wouldn't take much to send it over the edge if it was close. Just a thought.
Eddie
#9
If it has 40 hrs without any reversion, then it about impossible that it just developed it for no reason.
Did you maybe have the tongue of the trailer really low, which would have changed the tailpipe angle? That could cause water to run up the pipe if you were normally really close to reverting. It wouldn't take much to send it over the edge if it was close. Just a thought.
Eddie
Did you maybe have the tongue of the trailer really low, which would have changed the tailpipe angle? That could cause water to run up the pipe if you were normally really close to reverting. It wouldn't take much to send it over the edge if it was close. Just a thought.
Eddie
That said, when I had wet exhausts, I always made a habit of cranking up the tongue as high as it would go before running on the hose just out of principle. That's because I F$*(#ed that diesel I mentioned above due to running it without enough angle. (There's an article floating around on TheDieselPage.com about that Duramax project I did back in '04).
#10
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Thread Starter
If it has 40 hrs without any reversion, then it about impossible that it just developed it for no reason.
Did you maybe have the tongue of the trailer really low, which would have changed the tailpipe angle? That could cause water to run up the pipe if you were normally really close to reverting. It wouldn't take much to send it over the edge if it was close. Just a thought.
Eddie
Did you maybe have the tongue of the trailer really low, which would have changed the tailpipe angle? That could cause water to run up the pipe if you were normally really close to reverting. It wouldn't take much to send it over the edge if it was close. Just a thought.
Eddie