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2014 F-300s burning/making oil.

Old 07-14-2017, 08:28 AM
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Default 2014 F-300s burning/making oil.

I have twin 300s on my boat and have had issues with them making oil and now the port motor is burning oil. Took to the shop and they did a compression and leak down test on both motors. The port had two dead cylinders. Carbon build up was what hey said was the issue and yamaha will not cover it. This is the 3rd time for the same issues and still no help from yamaha. I use ring free, run the boat hard when coming back in from trolling, fuel stabilizer and 89 octane. Since yamaha will not admit there is a issue with the 300s is there anything else I can do to prevent this or is there anybody that has had any luck getting yamaha to address this problem.

Thanks
Old 07-14-2017, 08:42 AM
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horror story
Old 07-14-2017, 08:44 AM
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How many hours? What kind of oil do you use? How is boat typically used, such as do you make frequent runs to canyons? Does either motor smoke?

What does your mechanic recommend?
Old 07-14-2017, 08:47 AM
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That's nuts they will not cover it.
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Old 07-14-2017, 08:48 AM
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What was your WOT rpm?
Old 07-14-2017, 09:10 AM
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Carbon build-up diagnosis without taking engine apart and checking components...yea, right.
The only way to tell is to disassemble and inspect the engine. Are cylinders out of round, scored, burn marks, piston ring lands, rings, valves, guides, etc...
How many hours?
Old 07-14-2017, 09:17 AM
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If under warranty I would become an ugly customer and call Yamaha immediately.

JIm
Old 07-14-2017, 09:25 AM
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Originally Posted by 24seachaser View Post
This is the 3rd time for the same issues and still no help from yamaha.

Do we interpret that to mean you have lunched two power heads previously?

Something's not right here
Old 07-14-2017, 09:49 AM
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subbed for outcome
Old 07-14-2017, 09:53 AM
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Ok... what's the rest of the story. My guess is that it's a low hour, over propped, heavily trolled boat.
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Old 07-14-2017, 10:04 AM
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Hmmmm this is worth a sub....
Old 07-14-2017, 10:09 AM
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Freeman, G2, Seven Marine, flywheel change....okay now we can move on.
Old 07-14-2017, 10:44 AM
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Motors have 300 hours.

No motors were not taken apart and inspected yamaha would not pay. Bore scope was used to inspect cylinder walls for problems.

Nothing wrong with prop size boat will run 5700 to 5900 depending on load until the carbon build up happens then loose rpm.

Service manager at shop is close personal friend and have no reason not to believe what he says. He also is one of the best boat mechanics in my area.

Boat is used offshore trolling and fishing. Run the boat hard when I come back in. The trolling shouldn't be a issue it is what the boat is designed to do. Does yamaha not understand that?

In the big picture it shouldn't make a difference how I use my boat or how many hours are on it. If carbon build up is an issue then address it.

Yamaha has said it is part of maintenance of the motors and they will not cover it or do anything about it and they said that personally to me when I called the last time.
Old 07-14-2017, 11:44 AM
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Carbon build up in any brand of motor is not covered by warranty. Same with fuel system deposits. Same with water in the fuel. Most, if not all, warranties cover only defects due to material or workmanship issues.

Is there a defective part or a workmanship issue from the factory that is causing the motor(s) to build up carbon? If so, the service guy at the dealership should report to Yamaha whatever it happens to be.

Far too many seem to think that a warranty covers anything that goes wrong in a motor. It is not so.

Read the warranty, read the warranty, read the warranty.
Old 07-14-2017, 12:00 PM
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Originally Posted by alloyboy View Post
Carbon build up in any brand of motor is not covered by warranty. Same with fuel system deposits. Same with water in the fuel. Most, if not all, warranties cover only defects due to material or workmanship issues.

Is there a defective part or a workmanship issue from the factory that is causing the motor(s) to build up carbon? If so, the service guy at the dealership should report to Yamaha whatever it happens to be.

Far too many seem to think that a warranty covers anything that goes wrong in a motor. It is not so.

Read the warranty, read the warranty, read the warranty.
If he is following all the operating, fuel, and maintenance requirements how can a malfunctioning motor be considered maintenance? Is this a routine maintenance level of repair or a $5k power head?

I know the keyword is If.
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Old 07-14-2017, 12:42 PM
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Originally Posted by 24seachaser View Post
Motors have 300 hours.


Yamaha has said it is part of maintenance of the motors and they will not cover it or do anything about it and they said that personally to me when I called the last time.
Tell Yamaha to stick it. THATS BS.

Originally Posted by alloyboy View Post
Carbon build up in any brand of motor is not covered by warranty. Same with fuel system deposits. Same with water in the fuel. Most, if not all, warranties cover only defects due to material or workmanship issues.

Is there a defective part or a workmanship issue from the factory that is causing the motor(s) to build up carbon? If so, the service guy at the dealership should report to Yamaha whatever it happens to be.

Far too many seem to think that a warranty covers anything that goes wrong in a motor. It is not so.

Read the warranty, read the warranty, read the warranty.
Yeah, but what issue would a motor have to create so much carbon build up that would cause it to blow the power head? THATS BS. That's like when Yamaha Used the excuse that the HPDI had issues with saltwater molecules that were in the air, they would enter the intakes and blow the power heads. Where do you want me to run the motors inside the house??????
Old 07-14-2017, 12:47 PM
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One thing to be careful of is when you check the oil if you push the dipstick in to fast it pushes air in the tube giving a false low reading. I have seen many guys overfill the crank case because of this. Just something to think of.
Old 07-14-2017, 12:58 PM
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Originally Posted by 24seachaser View Post
The port had two dead cylinders. Carbon build up was what hey said was the issue and yamaha will not cover it. This is the 3rd time for the same issues
Originally Posted by 24seachaser View Post
No motors were not taken apart and inspected yamaha would not pay. Bore scope was used to inspect cylinder walls for problems.....Service manager at shop is close personal friend and have no reason not to believe what he says. He also is one of the best boat mechanics in my area.
Okay the 2 and 2 you offer will not add up to 4...

Dead cylinder as in zero compression?? Or reduced compression due to carbon induced sticky rings?

How was it treated/repaired the last 2 times? Who paid for it?

If you are having repeated carbon build up issues on an EFI 4 stroke there is some operator error or really chitty fuel involved. And as much I can enjoy a good Yamaha/Honda/Suzuki/Evinrude/Steve the brain bashing it doesn't sound like Yamahas fault.
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Old 07-14-2017, 01:05 PM
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I'm guessing he's being told he needs to do the YIEC treatment, not being told to pound sand on a dead powerhead. Calling carbon buildup maintenance is reasonable to a degree, dismissing a blown power head is not.
Old 07-14-2017, 01:08 PM
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I think you need to find a new mechanic/Friend if he doesnt have some sort of resolution for you in this....Where are you located? I would 10000% get a second opinion on this...

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