Leaking massive amount of oil

F

FuzzDaddy

Member
Jul 8, 2020
155
Boat Info
2002 Sea Ray 230 Signature
Engines
5.7 Mercruiser
Hi everyone,
I hope all is well. I put my boat in the water this weekend for the first time.
I ran it for about a hour or hour and a half. I changed the oil and all maintenance before using it for the first time. Boat ran perfect. Good oil pressure, steady temp at 170, runs very strong, no unusual noises. I was pretty impressed. I dry dock the boat so when I pulled it out of the water I removed the drain plug. And bam!!!! 3-4 quarts of new motor oil came out the garboard drain hole!!! I’m hoping it can be something stupid. I’m familiar with auto engines and if the boat is similar I don’t know how all that oil can come out of the engine in that short amount of time. The engine is a 2002 Mercruiser 5.7. It’s nearly impossible to get a good look around under the motor. I changed the oil about a week ago when it was in my driveway and left the garboard drain plug out. I didn’t see any oil leaking when the boat was on the trailer. So it must only be leaking when running. Any thoughts on what it could be?......
Thank you in advance!!
Corey
 
There could be a few reasons for this but first I would check the seal on the oil filter. Could it be possible you didn't remove all or some of the old O ring from the oil filter?
 
Is the oil filter mounted to the block or do you have the remote mount?
 
Hello,
Thank you for your reply.
Oil filter and o ring new.
No oil visible at all on valve
Cover gaskets or oil filter.
Seems to be rear of engine near garboard. I’m guessing that location because no signs of visible oil on top of engine anywhere.
Maybe crankshaft seal?
Can we rule out cracked block?
 
Here is a pic of the oil filter location...
 

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Do what Scof said and run it on the hose. Follow the oil lines from the filter back to the block - where the filter would normally be on a Chevy SB.
 
Wow that can be good news! I didn’t think there were remote oil lines. Makes sense. Might be the best news ever!! Boat is a hour away at the marina. I will definitely make a trip soon to check out.
Are the hoses visible and easy to get to? What kind of connections are the hoses so I bring the correct tools? Are the rubber or hard lines? I just want to make sure I’m prepared since it’s far away.
Thanks everyone for the very helpful info! I was thinking much worse but we will see.....
 
They're a real PITA actually. Bring large open end wrenches. Prob, 3/4" and larger . Bring a couple of each
 
Will do. I’m just glad it could be these lines and not a cracked block or something else serious. I would definitely choose this over something else. I assume these hoses wouldn’t leak with the engine not running or very minimal not to notice. With the engine running and the oil pump pumping the oil under pressure which is hopefully causing the leak. I remember looking through the garboard drain hole and the oil pan appears to be solid and no leaking where the oil drain hose is connected.
 
Fuzz. I have a 1988 5.7 in a 24 sorrento that i keep in florida for vacation. When i went to it last year it had 0 oil in it. Did oil change and notived oil in bildge. Got a borescope and peeked around for a bit. Had pin hole in oil pan at bottom just leaking out oil. Rather then pull motor to fix cleaned with wire brush, sand paper and used a crayon on holes to stop leak. Used gray marinetex on finger to seal area. Then next day put more marinetex on hand around frain plug and entire bottom. Problem fixed. Get a borescope for like $75 at any store and peek around under and around pan
 
2 things on a boat that i believe are a must. Borescope and heat temp gun. Makes your repair job easier. I run gun on all fittings to match actual temp and guage temp
 
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