Hey All,

Question. Is it normal to have thrull hull exhaust steam when the temperatures outside are a little cooler? Oil pressure is good, engine temp is also good. Is steam normal? also is it normal for the exhaust to throw a gas slick in the water when idling?

Short answer for most application -NO!

For the forum to begin to help with an accurate answer, you will be best advised to provide as much info on boat/engine details incl. engine hours and exhaust design

Gas slick better than oil slick. Lol. Seen that also. Sounds like you may be rich at idle. What engine etc?

Hi Guys,

Its a 96 Unlimited U19 with the 5.8L V8 Volvo Penta

Steam in cooler temps and especially with cooler lake water temps is normal.

And definitely nothing to worry about if you're pumping plenty of water and the engine temp is fine.

Now, if you're currently posting from the Middle East or the Equator then something might be going on !
Lot's on this topic archived as well .

Thank you Mad. I'm up here in Canada on Lake Ontario Lots of water and she runs like a top.

Any pretty rainbows behind your boat or a $50,000 fine. You need to fix whatever is coming out and putting the gas / oil slick on the water.

Fully aware of your concern. That is why I posted this. Thanks though. Need info.

How many hours since last tune up? If you have a corroded dist cap or bad plug wire or plug you could be blowing a little unburned fuel out one of the exhaust ports or potentially more than one. How many hours on the engine? Also is the fuel slick more noticeable during warm up or pretty much all the time. Compression test might not be a bad idea either.