Yamaha 225 leaking oil?

[Hroonk]

Here's an ongoing problem that's been puzzling my father and I for several weeks on a 2004 Yamaha F225.

After running the boat the engines for several hours and putting the boat on the lift, a small skeen of oil is present in the water around the port engine. There is also a sticky black residue on the lower unit. Most of it is above the cavitation plate, but it appears that a trail goes back to the exhaust. If it helps, the skeen on the water appears to be redish and in concentrict bands. It doesn't like to hold together the way a drop of engine oil or lower unit oil does as it distributes.

The first thing we did was check the lower unit oil - looked very clean about 4 weeks ago. Yesterday, after about 20 hours of additional use, it was darker (looked like dirty oil) but had no evidence of water or any milky look.

We thought maybe it could be a leaking hydraulic trim cyclindar b/c we sometimes have to raise that engine up on a low tide at the dock. After observing H-fluid in the water and checking the upper seals on the trim, everything appears fine.

Once the boat is on the lift, there are no additional signs of leakage from anywhere - exhaust, lower unit joints, prop, etc. The seals around the prop on this lower unit were just replaced this offseason, but the upper seals were not.

Any ideas?

[ElMar2530]

Check the exhaust tube.

[LuckyLady]

If the oils were just changed recently it could be residual oil that ended up in the lower splash pan..

Check and make sure that the oil filter is seated right.

Last but not least I would wipe all the areas dry and clean of oil and keep a close eye on it and see where it is coming from.

Gear oil has a distinct smell from the regular oil, steering fluid and trim oil really doesn't have much odor to it

[ElMar2530]

Lucky Lady - I know he have dealings with Yamaha, what are your thoughts on the exhaust tube problems that have been popping up lately?

I have F200's with zero problems, but reading some of this stuff online has me thinking.

[LuckyLady]

Lucky Lady - I know he have dealings with Yamaha, what are your thoughts on the exhaust tube problems that have been popping up lately?

I have F200's with zero problems, but reading some of this stuff online has me thinking.

I only know of 2 motors with the exhaust corrosion issues both engines being on the same boat.

The one that popped up on here the other day I would have to see pictures to see the relevance to the boat we had in the shop with the similar sounding problems.

I don't think the oil leak and the corrosion problem are on the same hand.

The F225'S have been pretty bullet proof very limited if any problems at all. Overall they are a great motor

[ElMar2530]

I agree, my motors have been great, I have heard the motor could leak oil if the corrosion is way out of hand but the motor would probably overheat befor that happens.

I'll know more when the boat comes out for the winter and I pull the lower units.

[LuckyLady]

I agree, my motors have been great, I have heard the motor could leak oil if the corrosion is way out of hand but the motor would probably overheat befor that happens.

I'll know more when the boat comes out for the winter and I pull the lower units.

It could but just like you said it would be overheating before it got to that point

Some maintenance tips to keep up on http://www.sportfishermen.com/board/...ml#post1784690