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Outboard "rattles" at high RPM and it didn't used
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rogerbum



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PostPosted: Thu Jun 09, 2011 11:15 pm    Post subject: Reply with quote

Tim, I can't diagnose the engine problem but as for the title of the video.....
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.
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Have you tried Viagra?

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starcrafttom



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PostPosted: Thu Jun 09, 2011 11:26 pm    Post subject: Reply with quote

i would have to come see it, and I can tomorrow afternoon if lunch is involed. I could not see if the prop was striking the vinc finn but it sounded like it. or....some thing is between the prop and the gear case Or.... something in the gear case is loose. i would pull the prop off and inspect it. do you have a dinghy?
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starcrafttom



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PostPosted: Thu Jun 09, 2011 11:30 pm    Post subject: Reply with quote

http://www.youtube.com/watch?v=d2gIdMRwfuM

no more to say
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timflan



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PostPosted: Thu Jun 09, 2011 11:42 pm    Post subject: Reply with quote

starcrafttom wrote:
i would have to come see it, and I can tomorrow afternoon if lunch is involed. [...] i would pull the prop off and inspect it. do you have a dinghy?

Lunch will be provided. Have dinghy, but probably easier to find a spot where we can back the boat up against a dock.

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starcrafttom



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PostPosted: Fri Jun 10, 2011 12:31 am    Post subject: Reply with quote

I have to supervise a marine survey in the morning in la Conner but should be in Seattle around 1pm? I will give you a call when I leave la Conner. Wheres the boat at? and email me your number encase I don't have it.
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SeaSpray



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PostPosted: Fri Jun 10, 2011 2:03 am    Post subject: Reply with quote

Hi Tim,

Good video. Sorry I can not help with the noise. I have the same year Johnson 90. Do you have the tach with the digital display that shows engine hours and fuel information? I have had a problem with mine.

I hope someone can identify the noise.

Steve
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Jazzmanic



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PostPosted: Fri Jun 10, 2011 11:43 am    Post subject: Reply with quote

starcrafttom wrote:
http://www.youtube.com/watch?v=d2gIdMRwfuM

no more to say

Too funny Tom!!! Laughing

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timflan



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PostPosted: Fri Jun 10, 2011 11:53 am    Post subject: Reply with quote

SeaSpray wrote:
I have the same year Johnson 90. Do you have the tach with the digital display that shows engine hours and fuel information? I have had a problem with mine.

Yes I have that digital display. Seems to be working fine. Maybe start a separate thread on that, and let's discuss.
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Les Lampman
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PostPosted: Fri Jun 10, 2011 3:19 pm    Post subject: Reply with quote

timflan wrote:
OK, I haven't had a chance to give this much attention, but today I ran the engine, I switched between the two fuel tanks and ran it at a variety of throttle settings. I heard the rattling when I ran it above about 3000 rpm, but not at lower RPMs.

But now I think I have new, helpful data. Video data:
Tim's YouTube video

Now I could'a SWORN I checked the rotation of the prop in neutral, with the engine off, right after I got unstuck when I was up the river last fall. It's the first thing I do after running into debris or touching bottom. Check the prop, examine all the blades, make sure it turns freely and on-axis.

It's virtually impossible to imagine that I did NOT do this back in October. So what happened? Perhaps I was simply not looking for a clicking sound. My focus would have been on the prop, the rotation, and the ease of movement. Maybe I just didn't notice the clicking.

Or maybe it's something that's gotten worse since then?

I just don't know. Experts, please watch my little video and tell me what you think. Thanks!


The sound in the video is absolutely normal! AB-SO-LUTELY. What's happening is you're turning it in the opposite direction that the remote is positioned to and the sound you're hearing is the clutch dogs slipping over the engagement pawls. If you turn it the other way it shouldn't turn at all (the pawls will engage).

That sound should only occur when the engine is in gear. If it's happening in neutral then the shift cable is out of adjustment (or at least the shift throw is not correct for some reason).

Les

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Sam Walker



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PostPosted: Fri Jun 10, 2011 8:54 pm    Post subject: Reply with quote

I could not have said anything better, Tom. That was great for me. I think I need to go to sleep now.
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C-Change



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PostPosted: Fri Jun 10, 2011 9:12 pm    Post subject: Reply with quote

Ok Tim - I have no idea what the issue is with your engine.... but I was ROFLMAO on Tom's video link Very Happy
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starcrafttom



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PostPosted: Fri Jun 10, 2011 9:42 pm    Post subject: Reply with quote

Les, I talked to Tim and I believe that the boat was in neutral when he was turning it. he removed the prop and all was in order. It has to be, as you noted, something in the gear box or the shift cable.
Which is over my head and should be looked at by a shop.

for the record I did not drive down today. got stuck a the survey of my folks boat. spent hour trying to figure what the yard did to kill all the start batteries when they put it on the hard. they left the key for the start circuit on all week. My folks are using this yard for the first time on a recommendation by me via another c-brat and so far I'm not total impressed. taking longer then stated and some of the work is less then par. I crawled under the boat to check the grates for the cooling water pickups. they where well painted. even the mass of clams clogging the grate had a nice coat of blue paint on them. Its all in the details people Wink
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digger



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PostPosted: Fri Jun 10, 2011 11:24 pm    Post subject: Reply with quote

I agree totally with Les. It is possible that when the motor is tilted, it is pulling on the cable -- perhaps the cable is breaking, stretching, or an end is pulling loose. If the motor is truly in neutral, and then that specific noise will be gone. Most noises will be "masked" unless you have the engine cowling (cover) off. Even then it is often tough to hear where specific noises are originating. I would change the plugs for sure -- often, preignition will give rattling noises -- that would be more likely when you are under load or high rpm conditions. That can happen due to deposits on the plugs that start "glowing" which causes the engine to fire without the actual spark ignition. Fuel injector problems can also cause erratic engine combustion, but those are more expensive to change than replacing plugs. You can also tell alot from the color of the plugs electrodes and porcelain. Good luck, Ron
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Les Lampman
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PostPosted: Sat Jun 11, 2011 3:41 pm    Post subject: Reply with quote

I'll add here that for me there are likely two different issues here.

The sound in the video I've heard hundreds of times and it's a normal sound from the lower unit (unless the shift cam is truly in neutral then there's something out of whack).

The noise when running is likely a different issue unless the shift throw is so far off the clutch dogs are slipping.
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timflan



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PostPosted: Sat Jun 11, 2011 5:42 pm    Post subject: Reply with quote

Les Lampman wrote:
I'll add here that for me there are likely two different issues here.

The sound in the video I've heard hundreds of times and it's a normal sound from the lower unit (unless the shift cam is truly in neutral then there's something out of whack).

The noise when running is likely a different issue unless the shift throw is so far off the clutch dogs are slipping.

Yeah, I'm starting to think that the high-rpm "rattling" is unrelated to my transmission issue. I really appreciate all the feedback.

Here's a new video that may provide more info:
http://youtu.be/QtKxdK_22UI

Interesting note: When the engine is shut down in neutral, if it was engaged in reverse last, prior to neutral + shutdown, the prop spins freely, with no noise. THAT'S the behavior I'm accustomed to, and since my last bit of maneuvering while docking or any other time is almost always a bit of reverse thrust, it's entirely possible that I would NOT have encountered this clicking sound when I spun the prop by hand previous times.

Again, there's a likelihood that the "rattling" at high rpm is completed unrelated, and I may or many not have some sort of transmission trouble.
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