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Old 01-15-2010, 11:21 PM   #1
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hydro locking???

can somebody please explain hydro locking to me. i know it has to do with water getting in the engine but thats about all i do know.

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Old 01-15-2010, 11:23 PM   #2
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Air compresses, water doesn't. If you get water into a cylinder the piston can't move up, engine "locks"

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Old 01-15-2010, 11:37 PM   #3
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ok makes since. besides avoiding larger/deeper puddles what is the best way to prevent this form happening to me? some rain we've been having lately
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Old 01-15-2010, 11:49 PM   #4
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Rain shouldn't be a problem unless you blast through very large puddles at high speed.
Hydro-locking isn't really that big a threat unless you submerge the intake. The best way to avoid it is with a snorkel.
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Old 01-15-2010, 11:54 PM   #5
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so id have to sink it just about to the hood to lock it up. thanks for the answers skeeter
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Old 01-16-2010, 01:07 AM   #6
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Or you could drive a lowered volkswagen through a severe rainstorm and hydro-lock it... Not speaking from experience or anything...

This is what water can do to an engine...

Notice Cyl# 1 connecting rod:
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Old 01-16-2010, 01:12 AM   #7
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lmao

Yeah, if you shoot water into your intake, you can hydrolock it...remember though, just because the water isn't actually up to the level of your intake, doesn't mean it's not splashing up into it. Hit a puddle hard/fast enough and it could shoot a huge gush of water straight up into it. I nearly did that on my four-wheeler a few years back... hit a pool of water going about 30-40. When I got out, it would barely run...every time I'd gun it, it'd try to stall out. When I got home, I popped open the air box and there was about an inch of water in there. Air filter saved my ass...every time I was giving it throttle, the air filter would suck the water against it and the lack of air flow was suffocating my engine.
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Old 01-16-2010, 01:26 AM   #8
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i will def. remember all of the advice you guys are giving me.
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Old 01-16-2010, 01:28 AM   #9
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Quote:
Originally Posted by wasurfer86 View Post
i will def. remember all of the advice you guys are giving me.
Right after you hit that big puddle at 15mph and stall out right?

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Old 01-16-2010, 02:28 AM   #10
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Right after you hit that big puddle at 15mph and stall out right?

. well lets hope that doest happen. so does hydro locking your engine totally kill it. i understand that if you had water in the cylinders and tried to get it to run it could. lets just say i hydro locked my engine, what do i have to do to fix it?
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Old 01-16-2010, 02:46 AM   #11
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It really depends on how high your rpms are at in the event that you hydro lock it. I hydro locked my Cherokee at 4500rpm ( i don't recommend it ) the front end hit the mud and just sank straight down. Luckly for me no rods were bent and all the cylinders were fine.

First thing to do. if you think you hydro locked it (it self shuts off after hitting water) DO NOT TRY AND CRANK IT pop the hood open the air filter and check that first. then take out all spark plugs. Now you can crank it and if you did indeed hydro lock it then a whole crap load of water will fire out of a few of the cylinders. (it'd be unwise to stand infront of that

Other issues that commonly happen with hydro locking an engine are 4 - 5 oil replacements with in 100 miles and a new starter, air filter, 4 - 5 oil filters to go with those oil changes. and possible a trans fluid swap out along with diff's drained and refilled.
Basicly unless you know you'll get through a 'puddle' with out submerging your intake DONT
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Old 01-16-2010, 03:11 AM   #12
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Other issues that commonly happen with hydro locking an engine are 4 - 5 oil replacements with in 100 miles and a new starter, air filter, 4 - 5 oil filters to go with those oil changes. and possible a trans fluid swap out along with diff's drained and refilled.
Basicly unless you know you'll get through a 'puddle' with out submerging your intake DONT [/QUOTE]

ok im starting to get it now. ^^^^^^^^ all of that stuff costs way less then a new engine. so if you hydro lock the engine it kinda depends on how hard you were running the engine at the time. lower rpms means less of a chance of damage to the rods and cylinders.
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Old 01-16-2010, 03:13 AM   #13
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Cost me about $900 to get it running right again. Last thing I had to replace was the TPS sensor. Apparently with out that little wonder working the engine has no idea what its doing and you get about 5 mpg
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Old 01-16-2010, 03:17 AM   #14
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Typically...it depends on how quickly the engine locks up. It's really a crapshoot...some engines may send parts flying everywhere, and others may fire right up with no problems after you pull the plugs and blow all the water out of the cylinders.
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Old 01-16-2010, 03:29 AM   #15
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Typically...it depends on how quickly the engine locks up. It's really a crapshoot...some engines may send parts flying everywhere, and others may fire right up with no problems after you pull the plugs and blow all the water out of the cylinders.
so if you completely submerged your jeep it would probably cause more damage because of the massive amounts of water making the engine seize up almost instantly. as opposed to just some water splashing up the intake and slowly bogging it down. could the force of the water entering the engine have more of an effect?
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Old 01-16-2010, 03:39 AM   #16
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It definitely would have an affect...I was thinking about that actually when I posted my last reply.

Water entering slowly would gradually slow it down...but could also break parts faster. Since the water doesn't compress...a little bit of water is going to stop the piston before it makes a full stroke, but the connecting rod is going to continue trying to make the full stroke even though the piston is stopped.

Water entering abruptly (ie submerging your intake) could stall it fast enough that no components had time to bend/break ...or if your engine was running too fast or it had a weak area, it could also stop so fast that a lot of stuff breaks. ie Basically like all of the pistons hitting a brick wall while the connecting rods still try to make them do a full stroke...breaking lots of stuff.
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Old 01-16-2010, 05:42 AM   #17
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Not just streams can do it.

Flop it on it's side or top and leaving it like thst for a time. Oil gets past the rings, a fills the chambers. Same result.

Or a leaky head gasket.

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