Oil In Bilge
 

I have 2 420 hp's that are 15 years old. I noticed yesterday that I have some oil in the bilge. Its a ring around the water in the bilge. Its hard to say how much is in there. Lets just say its a ring around the bilge. On more than an 1/8 of a cup. I ran the boat for 2 hours at 3000 to 3500 rpm. I know it can be normal for older engines to leak some oil. It is not an apparent leak. I see no trails in the bilge or drips when running the engine with the hatch open? The question is how should I touble shoot it and what should I do about it? Where are the most common places these engines leak oil?? Thanks

Re: Oil In Bilge
 

Rusty oil pan? Bravo rez leaking? If you have the garbage round rez for Bravo I'll bet its the cause, they all leak at some point.

Re: Oil In Bilge
 

I don't have bravo I have TRS drives. Also, how do you tell if you have a rusty oil pan?

Re: Oil In Bilge
 

Try feeling around with your hand .. if you can reach. Or get under there with a bright light and mirror if you have to. Watch the mirror for a few minutes and if it's leaking you'll see the drip.:(

Re: Oil In Bilge
 

Also check the drive lube resovoirs on TRS inner transom assembly. I decided to check on service work by marina that was supposed to include topping off all fluid. TUrned out they didn't fill the resovoirs -- so I filled 'em up.

Today I was doing some project stuff and there was lune oil in bilge--everything else was as I left it last weekend so I'm assuming culprit was from filling (or overfilling) those resovoirs.

It started to rain before I could check closely--another project.

Re: Oil In Bilge
 

Poorsche, now you got me thinking. The only thing I did was fill the transmission fluid levels before I discovered oil in thr bilge. How do I distinguish the difference between transmission and engine oil? Trans is red and oil is clear when new but wouldn't they both be dark in color after they are old???

Re: Oil In Bilge
 

The lube in the TRS resevoir is bluish-greenish stuff--Mercruiser HP GearLube is what I used. Trans fuid is the red stuff.
I would thing the trans fluid would be real obvious it was in the bilge alone--if it's mixed with the gear lube--not so obvious.