question about hydro-lock

flashback

Captain
Joined
Jun 28, 2002
Messages
3,988
I believe I have a pretty good idea of what it is and what causes it, but when does it occcur? can an engine be running along at say 2500 rpm and just lock up? or does it happen after the engine is shut down and then restarted. I guess i just want to know the symtoms...thanks
 

Rob Lung

Cadet
Joined
Dec 29, 2002
Messages
12
Re: question about hydro-lock

It has happened to me twice: Once just sitting on the middle of lake with motor off and once after overheating. The first time we were all hanging around the aft and a big 35+ go fast went by pretty close. Hydro-loc = big wake+rear end loaded up+worn out flapper valves. Got the flappers replaced and I no longer encourage hanging out on the swim deckin deep water. Second time the engine overheated and when I shut it off I think the heat of the motor drew a vacum and water got past the flapper. Bear in mind that the Sea Ray I have, the motor is very low in the boat and I think prone to loc. I have learned to become manic about it and have not had any problems in a while.<br /><br />I suggest you always have a spark plug socket, and a can of either starting fliud or wd40. If you find youself locked up pull the plugs rotate the motor and shoot some wd in the pistons right away, dry out the plugs and fire her up. Check for water in the oil.<br />My 2 cents
 

Bondo

Moderator
Staff member
Joined
Apr 17, 2002
Messages
71,110
Re: question about hydro-lock

Rusted out risers,+ Cracked exhaust manifolds are to blame quite often....<br />At 2500rpms the exhaust velocity is to high...<br />At Idle, Is a different story....<br />Many times it's a Shut-down motor starting hard, that lets you know..
 

denniz

Senior Chief Petty Officer
Joined
Aug 21, 2002
Messages
743
Re: question about hydro-lock

Make sure your exhaust shutters are in place...
 

flashback

Captain
Joined
Jun 28, 2002
Messages
3,988
Re: question about hydro-lock

thanks for the info guys, reason I ask is I had a little trouble getting cranked up the other day, seemed like a low battery situation or maybe a bad starter relay but after about 3 or 4 minutes she cranked up.. no water in the oil... I'll keep an eye out ......thanks again.......
 
Top