Oil Leak on Yamaha HPDI 250

[lost sailor]

I went to my boat and there was oil on the transom that leaked from the internal oil tank. I had the engine raised all of the way, and I believe that the internal oil tank cap may be faulty. It has 3 or 4 wires going into it and the seal or gasket may be bad, but I am not sure. The total amount of oil was about that of a shot glass or two.

Has anyone ever seen this? I am windering if it is common. I had some oil pump work done at the end of last season, but I dont think that has anything to do with this (at least I hope). Any feedback is appreciated.

[CapBob]

Never had that problem with mine.  Check the oil line and as you said the cap.  Sure you didnt spill any on last fill?

[lost sailor]

Yeah. I have an auxiliary tank that I fill on the stern. I think it is leaking at the cap and then when the level reaches the leak, it stops. Not a lot, but enough to be messy.

Does anyone know what those caps go for or what the wires are for?

[CapBob]

the wires are the sencors that feed the engine oil and sound alarm when level is low

[Fishfool]

found same cap leaking on 175hpdi 2 seasons ago, replaced with new oem.

[Maritime Matt]

Hey Joe.
We do see this on occasion. Very easy to see if this is where its coming from.
OEM Part # should be 61A-85730-01-00 Oil Level Gauge assembly. $140.55 from Yamaha. If you replace it, make sure you put the new one in the same position as the old one.
Let me know how you make out.
Matt

[lost sailor]

It must be the cap. I checked on her today and there was no spilage at all. The difference was that this time I left the engine straight ahead. When it leaked it was turned a bit to reduce the angle on the hydraulic hoses. I am gonna keep an eye on it and replace it shortly.

Thanks everyone for the input.

LS

[Maritime Matt]

We have seen the neck of the oil reservoir go out of round and cause a leak as well. I would replace the sender first and if it still drips replace the reservoir. I've done a few Mercury's with the same issue.
Matt