Port Engine Overheating

[RickieT]

Greetings,

Bought my first boat!!! Very excited and want to learn to do my own repairs, if at all possible. Have a 1997 350 Mariner with a 2 Crusader 350 XL engines. Starboard engine temp is perfect and port engine overheats when over 2200. Had a mechanic come in fill coolant check hoses and replaced both engine's impellers thinking that would do the trick. It's a little better but still overheats and white smoke emits from port engine. I'm thinking of trying Sea Flush with Barnacle buster or Salt Away on my own as a next troubleshooting step and last resort replacing the riser(s). Those are big bucks come to find out. I've been watching you tube videos on this process. Anyone have a link or tips for flushing all the crap that may be in the engine making it overheat? Do I need to remove the impellers when doing this chemical flush? Before I purchased the boat it had sat for a long while...

Many thanks

Rick

[mjk1040]

OK Rick; I assume u have closed cooling by ur narrative. White smoke suggest u are burning the antifreeze. Head or intake gasket is bad. A cooler is bad and letting anti freeze into the exhaust via the raw water system. Does ur antifreeze level drop over time? Now ur in salt water I take it and replacing exhaust manifolds is common about every 5 years or so. How long did it sit on the dry? Can u post a pic of the smoke sometime? The Barnacle buster etc. can just be put in a pail and sucked in with the fresh water pumps. Let it stand in the engine for a good period of time, then just fire it up to flush out the junk. But as I said true white smoke indicates ur burning antifreeze. Keep us posted.

[SanJuanDreamer]

If the exhaust system hasn't been changed between 5 to 7 years, you should seriously consider getting that done.
Also, rod out the Heat Exchanger and replace the U-cooler.
You didn't post much info about your motors so I'm going with what I did on my Mariner.

[bud37]

Rick.... Just to add to all above, your white "smoke" could just be steam from a flow restriction....chances are if you are burning antifreeze you will smell a sweet smell from the exhaust.....what did your mechanic say about the steam ?

edit , spellcheck correction....

[RickieT]

Qr Bbpost Greetings,

Bought my first boat!!! Very excited and want to learn to do my own repairs, if at all possible. Have a 1997 350 Mariner with a 2 Crusader 350 XL engines. Starboard engine temp is perfect and port engine overheats when over 2200. Had a mechanic come in fill coolant check hoses and replaced both engine's impellers thinking that would do the trick. It's a little better but still overheats and white smoke emits from port engine. I'm thinking of trying Sea Flush with Barnacle buster or Salt Away on my own as a next troubleshooting step and last resort replacing the riser(s). Those are big bucks come to find out. I've been watching you tube videos on this process. Anyone have a link or tips for flushing all the crap that may be in the engine making it overheat? Do I need to remove the impellers when doing this chemical flush? Before I purchased the boat it had sat for a long while...

Many thanks

Rick

[RickieT]

Qr Bbpost Greetings,

Bought my first boat!!! Very excited and want to learn to do my own repairs, if at all possible. Have a 1997 350 Mariner with a 2 Crusader 350 XL engines. Starboard engine temp is perfect and port engine overheats when over 2200. Had a mechanic come in fill coolant check hoses and replaced both engine's impellers thinking that would do the trick. It's a little better but still overheats and white smoke emits from port engine. I'm thinking of trying Sea Flush with Barnacle buster or Salt Away on my own as a next troubleshooting step and last resort replacing the riser(s). Those are big bucks come to find out. I've been watching you tube videos on this process. Anyone have a link or tips for flushing all the crap that may be in the engine making it overheat? Do I need to remove the impellers when doing this chemical flush? Before I purchased the boat it had sat for a long while...

Many thanks

Rick

https://youtu.be/pmoAFmMrXU4

[RickieT]

Here is the smoke/steam...

[RickieT]

Qr Bbpost OK Rick; I assume u have closed cooling by ur narrative. White smoke suggest u are burning the antifreeze. Head or intake gasket is bad. A cooler is bad and letting anti freeze into the exhaust via the raw water system. Does ur antifreeze level drop over time? Now ur in salt water I take it and replacing exhaust manifolds is common about every 5 years or so. How long did it sit on the dry? Can u post a pic of the smoke sometime? The Barnacle buster etc. can just be put in a pail and sucked in with the fresh water pumps. Let it stand in the engine for a good period of time, then just fire it up to flush out the junk. But as I said true white smoke indicates ur burning antifreeze. Keep us posted.

The boat just wasn't used a lot...it wasn't out of the water at all for a long period of time.

[throwback2]

Looks like steam to me.My suggestion would be to clean the oil cooler and heat exchanger. You'd be surprised what gets caught and grows.Also,get yourself a temperature scan gun ( Harbor freight $20-$30) and It can help you find where restriction(s) could be.

[RickieT]

Qr Bbpost OK Rick; I assume u have closed cooling by ur narrative. White smoke suggest u are burning the antifreeze. Head or intake gasket is bad. A cooler is bad and letting anti freeze into the exhaust via the raw water system. Does ur antifreeze level drop over time? Now ur in salt water I take it and replacing exhaust manifolds is common about every 5 years or so. How long did it sit on the dry? Can u post a pic of the smoke sometime? The Barnacle buster etc. can just be put in a pail and sucked in with the fresh water pumps. Let it stand in the engine for a good period of time, then just fire it up to flush out the junk. But as I said true white smoke indicates ur burning antifreeze. Keep us posted.

I think this is steam...I posted a youtube video of it and my gauges at the time it was overheating...it is in salt water...San Francisco Bay