Trojan Boat Forum

Hello everyone!! I have smoke coming out of my port exhaust. When i rev her up more smoke comes out.There is raw water coming out. The engine is running fine. Any suggestions? Thank you so much!!

If you have a smoking exhaust, your engine is burning oil.
Or you have very old gasoline in your gastank.

Many boats are smoky if the engines were off for a long term. It will be better after a couple of hours with running engines.
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Greetings - Heiner

The color of the smoke can can give you clue .
Black smoke is normally running to rich ( to much gas ).

White smoke ( steam ) On of the risers could be plugged even if flow looks ok or it can be a head gasket issue burning coolant if fresh water cooled or water if raw water cooled

Blue smoke in normally oil burning ( make sure oil is not over filled )

What Paul said. Check coolant level if FWC,had same issue on a 318 that was a head gasket leaking.

First, take a look at your raw water strainer. I have seen clogged strainers the culprit to steam coming from exhaust. Worth a look.

thanks for all the replys everyone. it really means alot. Never thought it could be steam. my 318 is raw water cooled. replaced one riser last year. on the port engine. Where is the raw water strainer located?

You may not have one inline just the thru hulls straners, check the trans cooler to see if its stopped up . If you already replace 1 riser good chance the other maybe due , I always recc they be replaced in pairs.

Now my engines are 350 GM's but same principal applies. I had white smoke or steam from the port exhaust and found half the blades broken off the water pump impeller. If you don't know the last time they were inspected/replaced it may be worth a peek.

so you are seeing "smoke on the water" ?

kidding aside what does it smell like? steam, excessive gas and burning oil have different smells (and colors as mentioned above)

Surely there's SOME amount of steam that's acceptable, isn't there? I certainly get some out of BOTH of my exhaust pipes.

Hart wrote:Surely there's SOME amount of steam that's acceptable, isn't there? I certainly get some out of BOTH of my exhaust pipes.

The amount of steam you see coming out of the exhaust is related to the humidity in the air. On very humid days, it looks like I have a smoke screen behind me. On dry days, I have very little or no steam at all.

The Dog House wrote:

Hart wrote:Surely there's SOME amount of steam that's acceptable, isn't there? I certainly get some out of BOTH of my exhaust pipes.

The amount of steam you see coming out of the exhaust is related to the humidity in the air. On very humid days, it looks like I have a smoke screen behind me. On dry days, I have very little or no steam at all.

Whew. Good to know. I was a little nervous there for a minute. I remember growing up as well, on my father's first boat (a late 60's 31' Chris Craft skiff). I remember steam from those exhaust pipes as well.

Hart wrote:

The Dog House wrote:

Hart wrote:Surely there's SOME amount of steam that's acceptable, isn't there? I certainly get some out of BOTH of my exhaust pipes.

The amount of steam you see coming out of the exhaust is related to the humidity in the air. On very humid days, it looks like I have a smoke screen behind me. On dry days, I have very little or no steam at all.

Whew. Good to know. I was a little nervous there for a minute. I remember growing up as well, on my father's first boat (a late 60's 31' Chris Craft skiff). I remember steam from those exhaust pipes as well.

Colder air temps can make it worse too.