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Yamaha f150 harmonic balancer failure

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Yamaha f150 harmonic balancer failure

Old 07-05-2017, 07:34 PM
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Default Yamaha f150 harmonic balancer failure

Backstory
2006 Yamaha F150
950 hrs

Guy is idling away from boat launch and gets the oil pressure alarm. Shuts it down
Calls his normal mechanic who tells him to "unplug the oil pressure sensor and run it, it'll be fine"

He doesn't thankfully, and called me. Bad thing is, he said it never made the "whining'' sound that comes along with the balancer failure.

So for those of you waiting to hear the noise, I'd quit gambling. This is the 3rd motor ive had to tear down this year.
Sorry for sideways pics.

Nate Duvall
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Last edited by Captainfatbarn; 07-05-2017 at 07:43 PM. Reason: More info
Old 07-05-2017, 07:35 PM
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Old 07-05-2017, 07:36 PM
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Old 07-05-2017, 07:36 PM
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Old 07-05-2017, 07:37 PM
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Oil pump screen
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Old 07-05-2017, 07:38 PM
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Oil pump screen2
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Old 07-05-2017, 07:41 PM
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Old 07-05-2017, 07:43 PM
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Ouch
Old 07-05-2017, 07:43 PM
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Looks like the screen was open enough that it didn't wreck his powerhead.
Old 07-05-2017, 08:46 PM
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I did mine preemptively, and as much as I like my engines, this is BS from Yamaha. These should be recalled and replaced as these parts are defective. I hope that being he shut it down right away there is no need to rebuild.
Old 07-05-2017, 09:16 PM
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Just replaced mine with the latest and greatest version. From what I can see its the same thing as all the other revised versions except this newest one sprays oil. Not sure putting in the latest one really makes much difference honestly as that composite gear is still there. In hind sight I probably should have just taken the old one out and not replaced it at all.
Old 07-05-2017, 09:16 PM
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Default Mine too

Yep...I replaced mine at 1300 hrs with the whine on twins with the latest version that Yamaha states does not fail. Mine just failed at 1600 hrs with no whine just oil pressure alarm offshore. Sent Yamaha pictures and told them what happened and they said new versions do not fail. Said I had to have hit something to cause this damage. $2000 in labor to clean out all the debris from the head and buy another new full priced balancer that won't fail....
Old 07-05-2017, 09:18 PM
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as soon as he got the oil buzzer while idling he shut it down. May have to disassemble the block all the way though to make sure no damage has been done
Old 07-05-2017, 09:19 PM
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I took mine off my engine altogether. Runs great. No issues.
Old 07-05-2017, 09:19 PM
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Originally Posted by JiminAZ View Post
Looks like the screen was open enough that it didn't wreck his powerhead.
That was after I sat it down on the table. It was filled all the way across
Old 07-06-2017, 04:59 AM
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Originally Posted by Captainfatbarn View Post
That was after I sat it down on the table. It was filled all the way across
It's a great picture to illustrate what happens when that gear fails though.
Old 07-06-2017, 07:01 AM
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Originally Posted by Basenjib123 View Post
Just replaced mine with the latest and greatest version. From what I can see its the same thing as all the other revised versions except this newest one sprays oil. Not sure putting in the latest one really makes much difference honestly as that composite gear is still there. In hind sight I probably should have just taken the old one out and not replaced it at all.
When I compared my old balancer to the latest , I noticed that the gears on the new version also had more backlash than the old one.. My old one was actually stiff at one point of rotation. Mine had an audible whine. Not sure of the hours. I replaced mine before it failed.
Old 07-06-2017, 07:12 AM
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Originally Posted by ktribit View Post
Yep...I replaced mine at 1300 hrs with the whine on twins with the latest version that Yamaha states does not fail. Mine just failed at 1600 hrs with no whine just oil pressure alarm offshore. Sent Yamaha pictures and told them what happened and they said new versions do not fail. Said I had to have hit something to cause this damage. $2000 in labor to clean out all the debris from the head and buy another new full priced balancer that won't fail....
Who at Yamaha told you this? What Yamaha? Are you in the USA? You must have been talking to the new guy on the phone. Did he even know what balancer you were talking about? Maybe he confused it with the new F350 flywheel/rotor/harmonic balancer.
Old 07-06-2017, 07:14 AM
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Originally Posted by Captainfatbarn View Post
That was after I sat it down on the table. It was filled all the way across
What do the cam shaft bearing surfaces look like? Or the shafts themselves?
Old 07-06-2017, 07:18 AM
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Originally Posted by Captainfatbarn View Post
Backstory
2006 Yamaha F150
950 hrs

Guy is idling away from boat launch and gets the oil pressure alarm. Shuts it down
Calls his normal mechanic who tells him to "unplug the oil pressure sensor and run it, it'll be fine"

He doesn't thankfully, and called me. Bad thing is, he said it never made the "whining'' sound that comes along with the balancer failure.

So for those of you waiting to hear the noise, I'd quit gambling. This is the 3rd motor ive had to tear down this year.
Sorry for sideways pics.

Nate Duvall
That motor came with the -02-00 configuration balancer. Before the oil tower was added. Should have been replaced many many moons ago.

You are correct that folks are gambling if they don't upgrade to the latest part number. But if they do, and they lose, that is just a lost bet. They suffer the consequences. Happens all of the time.

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