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Old 04-01-2005, 02:10 PM
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Default New Yamaha F150 smoking/steaming

I just splashed my 190 Nantucket with its new power on the transom. Prior to today the boat/engine combination had been piloted for 1.4 hours (in December), with today adding another single hour to that total. In today's splashing I noticed that out of the rear center of the engine, just below where the cowling lifts off, an exhaust pipe was spurting out continuous blue greyish smoke. Or perhaps it was steam, as it seemed to dissipate quickly.

I checked the oil (it was full and clean) and the fuel filter (it was clear and clean). Is this a nomal occurence during break-in, or perhaps is it just steam or water vapor (the temp was 45 degrees and damp). My worry is that if it's something more serious, perhaps my mechanic should look at. Please forgive this request for information from a newbie, and also forgive my lack of question mark useage, as something is wrong with my keyboard, which, thankkfully is not smoking/steaming.
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Old 04-01-2005, 02:39 PM
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Default RE: New Yamaha F150 smoking/steaming

Quote:
NantucketSal - 4/1/2005 3:10 PM

I just splashed my 190 Nantucket with its new power on the transom. Prior to today the boat/engine combination had been piloted for 1.4 hours (in December), with today adding another single hour to that total. In today's splashing I noticed that out of the rear center of the engine, just below where the cowling lifts off, an exhaust pipe was spurting out continuous blue greyish smoke. Or perhaps it was steam, as it seemed to dissipate quickly.

I checked the oil (it was full and clean) and the fuel filter (it was clear and clean). Is this a nomal occurence during break-in, or perhaps is it just steam or water vapor (the temp was 45 degrees and damp). My worry is that if it's something more serious, perhaps my mechanic should look at. Please forgive this request for information from a newbie, and also forgive my lack of question mark useage, as something is wrong with my keyboard, which, thankkfully is not smoking/steaming.
you're right - just steam/water vapor...
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Old 04-01-2005, 02:51 PM
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SIM
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Default RE: New Yamaha F150 smoking/steaming

Nantucket,

You may have had some residual oil from the engine not running that has weeped by the pistons and rings and gotten into the combustion chamber. Remember that your engine when tilted down, the cylinders are horizontal. The oil can collect behind the pistons when not running and a small amount can seep by. When you start it....poof....a little blue smoke.

I see this often on boats that are left in the water with the engine(s) tilted down for a few days. Yes.... we can do that here in good*old freshwater *

Another possibility is that your dealer fogged the cylinders for storage.....but you did not mention if this was your initial start up.

Andy
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Old 04-01-2005, 03:04 PM
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Default RE: New Yamaha F150 smoking/steaming

Thanks gents.

SIM, this was my initial run after winterizing, but I am not sure it is fogging oil as it didn't subside the whole time the engine ran (about an hour). If it is just steam coming from that exhaust...I say phew, and look forward to warmer days.

Thanks for responding,
Sal
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Old 04-01-2005, 03:14 PM
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Default RE: New Yamaha F150 smoking/steaming

My F115 will do the same thing after it has been up for a little while, and on colder days. Doesn't really bother me any.
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Old 04-01-2005, 05:20 PM
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Default RE: New Yamaha F150 smoking/steaming

the things are bullet proof if you are peeing just run it like it was designed to you worry to much
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Old 09-02-2006, 03:39 PM
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Default RE: New Yamaha F150 smoking/steaming

I think its normal,I have a 2005 Yamaha F150 with 154 hours. I had stored it on the trailer with engine all the way down for a couple weeks without use. When I fired it up this morning - i got a small amount of very light white/grey looking smoke. Went away after I warmed the boat up. Didn't do it again all day after several restarts.
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Old 09-02-2006, 07:41 PM
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Default Re: New Yamaha F150 smoking/steaming

I noticed that also when my engines were that new. Just run them/it in according to the breakin instructions, and don't be afraid to go to wot for short bursts. The engine needs it to set the rings/etc.

I don't think it's anything to worry about. It went away on my engines.

In just about 100 hours of use, I haven't had a single problem with them, haven't had to download any software, haven't had alarms blaring, haven't spun any props, haven't had them not start or bog down, I'm not dissapointed with fuel burn/hole shot/top end, and I'm not waiting for a factory rep to come down and take a ride on my boat to diagnose a problem.

Guess I'm just lucky.

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