BMc 1.5 diesel in wet exhaust

[lexicon]

Recently there have been a bit of diesel showing in the water coming out of the exhaust of my BMc 1.5 . Usually running at highish revs while charging batteries.

 

Any advice on why this may be happening and ways to reduce/stop.

[Kieron G]

Hi, are you sure that this is not engine oil, Our engine seeps oil through the flexi at the lowest point of the exhaust, maybe not ideal but it is over fifty years old.

[Neil2]

Does it do this when the engine is under load or is it just when in neutral?

[lexicon]

Not been able to check under load yet so may have to do a cruise this weekend.

[Neil2]

You could just try putting it in gear whilst tied up, provided it isn't going to upset anyone.

 

I don't really have the expert technical knowledge but until someone else comes along... If you are sure it is diesel, but the problem disappears when under load, I would suspect an injector problem. I had this issue with my last boat, though it was a 1.8, if the injectors are worn or dirty they will work ok when asked to do some work, but if on tickover or running in neutral the engine doesn't burn all the fuel so the excess gets chucked out of the exhaust. It usually manifests as white smoke though, rather than actual fuel, so I'd make sure it is diesel for sure before interfering with injectors. Incorrect timing can also cause this problem, I'm told.