Engine Didn't Grenade/Something Happened/And Final Report

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Some interesting reading should the RF not do the job.

A commercial, Yamaha internal engine(carbon cleaner):

https://www.amazon.com/Yamaha-ACC-CLEAN-D1-00-Internal-Clnr-ACCCLEAND100/dp/B009460FYM It's NOT supposed to be sold to the public but can be found.

A long thread but specifically posts 48, 53 and 78:

https://www.yamahaoutboardparts.com/forum/general-discussion/yamaha-outboard-forum/25452-yamaha-9-9-4t-oil-consumption/page4

*Member "Rodbolt" is a Master Marine Mechanic of over 3 decades and knows his stuff..

 
I still have not read any definite original cause for this...shutdown. It was locked up but it wasn't. It had a cylinder full of fuel but there was nothing wrong with the injector. Weren't there gold bars in the oil? I forget now, it has been so long since all of this started.

Other than a lot of carbon and valves needing adjustment I don't see where anything got "fixed".

Maybe one of the noobs can help diagnose it for me.

 
Man you old timers get to where you get a few thousand posts and you just look for nubis to pick on.

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To be honest, we don't have to look. Nubes are lined up doing stuff asking to be next.

Wait a second! Did I see "nipple" in there somewhere?

 
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I still have not read any definite original cause for this...shutdown. It was locked up but it wasn't. It had a cylinder full of fuel but there was nothing wrong with the injector. Weren't there gold bars in the oil? I forget now, it has been so long since all of this started.
Other than a lot of carbon and valves needing adjustment I don't see where anything got "fixed".

Maybe one of the noobs can help diagnose it for me.
Metal in oil ? Where did it come from ? Happy its running.

 
First, I never saw the oil that came out, so I can't confirm there was metal in it. It possible it was drained into a dirty pan.

Second, the only problem I have confirmed is that 5 of the 8 exhaust valve clearances were out of spec (open) and the others were close. Oddly, 2 of the three that were in spec were #2 cylinder. There was only one intake that was out of spec and it was #1-2. At this point carbon build up is the only real problem I have seen. I still have another clearance check to do since running it to temperature and putting some water through it.

Believe me, after all I have done and found no smoking gun I am concerned that it could reoccur.

 
First, I never saw the oil that came out, so I can't confirm there was metal in it. It possible it was drained into a dirty pan.Second, the only problem I have confirmed is that 5 of the 8 exhaust valve clearances were out of spec (open) and the others were close. Oddly, 2 of the three that were in spec were #2 cylinder. There was only one intake that was out of spec and it was #1-2. At this point carbon build up is the only real problem I have seen. I still have another clearance check to do since running it to temperature and putting some water through it.

Believe me, after all I have done and found no smoking gun I am concerned that it could reoccur.
To be completely serious (yeah, I know. But I will try!) I know what you do for a living and I know your troubleshooting skills should be excellent. I know that if you have not found A Reason you have to be concerned. You know the history of this bike, you know everything about it. I cannot blame you for going through it and trying to keep it going. Certainly it should have a lot of life left in it.

I don't have any Good Advice but I do have a lot of confidence in you. This has been a Good Thread. I sure hope it has a happy ending.

 
Thanks for the kind words Andrew.

It appears that the carbon cleaning was successful. The clearances all tightened up with 4-1 exhaust and 1-2 intake out of spec tight. Did the best I could with the shims I had to get everything close to the 70 percentile. 1-2 and 2-1 intakes were the only ones I didn't have the shims to get to the 70th. They were left at 0.160 and 0.180 respectively. I will be doing another check after EOM and will replenish my shim stock.

The bike is on it's way back home with my brother right now. Took it for a ride yesterday to take it through the gears. I still can't believe how tight that bike is with over 100k on it. It ran great. I will see it again a week from this Wednesday. Everyone at EOM will see it the next few days.

 
Congrates!!

You might have him consider running Ring Free regularly.

Or at least a shock dose every once in awhile- Great stuff!!

Out of curiosity, (if you have the time), try another leak down test... I'd be curious

how much it improved

 
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So... is the moral of the story ... Carbon build-up can be a bitch! Use RFree or SFoam or Techron annually.
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