scott123007
Well-Known Member
You've got my attention! I would think if it was valve related, it would still run on one cylinder if it still turns over...jaeger22 said:
Valve Adjustment Nightmare!
- Thread starter jaeger22
- Start date
RED CAT
New Member
IMHO, its some of that dirt that fell into your motor. Might be serious.
Duconce
New Member
Ya Think?RED CAT said:
Not likely the dirt. It fell into the right cylinder and the valves were closed. I was able to vacuum it all out as far as I could tell. Then blew it out with the air compressor. I am thinking about a washer that went missing. If it fell into the cam chain tunnel without me noticing . . . .
Well it is looking bad. So far I removed the clutch cover and found about a tea spoon of fine chips. Also when I drained the oil, nothing came out of the front plug. All the oil came out of the rear plug. So the oil pump may be clogged? I think the motor is toast.
I still haven"got the cylinder head cover off, maybe tonight after work, but I am thinking it will be a total rebuild.
In 45 years or so of doing all my own maintenance on all my vehicles, including cars, trucks, and motorcycles, I have made some bone head mistakes along the way but have never had a motor eat it self like this after maintenance or even a compete rebuild. I am really bummed.
I have to work today and all week so progress will be slow but I will post what I find. No matter how embarrassing.
John
Well it is looking bad. So far I removed the clutch cover and found about a tea spoon of fine chips. Also when I drained the oil, nothing came out of the front plug. All the oil came out of the rear plug. So the oil pump may be clogged? I think the motor is toast.
I still haven"got the cylinder head cover off, maybe tonight after work, but I am thinking it will be a total rebuild. In 45 years or so of doing all my own maintenance on all my vehicles, including cars, trucks, and motorcycles, I have made some bone head mistakes along the way but have never had a motor eat it self like this after maintenance or even a compete rebuild. I am really bummed.
I have to work today and all week so progress will be slow but I will post what I find. No matter how embarrassing.
John
Hope its not to bad....I'd rather have your motor running than make my point....
Well at this point hopefully we can identify the "what", as opposed to so much focus on the "why". The "why" is something bigger than a miniscule amount of dirt/sand, like you said, maybe a rogue washer.
While not necessarily great for the motor, you'd hope a trace amount of dirt would blow out through the exhaust valve, not blow up the motor.
I'm just a layman, so shoot holes in that theory if I'm stupid for thinking that. A teaspoon of metal shavings are no good, no matter how it gets spun. Were they magnetic, what color where they?
While not necessarily great for the motor, you'd hope a trace amount of dirt would blow out through the exhaust valve, not blow up the motor.
I'm just a layman, so shoot holes in that theory if I'm stupid for thinking that. A teaspoon of metal shavings are no good, no matter how it gets spun. Were they magnetic, what color where they?
Karson said:
Nope, you're exactly right, Karson....
Just as you surmise, even if a fairly big chunk of dirt, sand, etc. fell into the intake port, and then made it through the intake valve - either in one piece of broken up - it would then just live a bit in the combustion chamber until it got blown out past the exhaust valve with the rest of the exhaust. Sure, it could shot-peen the top of the piston some, or even damage a valve seat or valve slightly, though both a tiny amount if at all, but the engine would most likely run... And anything like that would not cause the catastrophic failure poor Jaeger22 is experiencing.
Besides, as he said, the intake valve was closed, and he vacuumed or blew any of that residue out of there prior to reassembly.
Nope, I'm afraid he's probably exactly right... A little washer or dowel fell out of place unnoticed, and probably fell down the camchain tunnel. There it lived a bit before it get swept up into someplace where it couldn't occupy the same place with something else, and everything involved in the meeting became much the worse for it.
My condolences, Jaeger22... As much as I hate to say it, I don't think you're gonna' like what you find, and the results are liable to be very, very expensive.
Dallara
~
Surely there must be a crashed or totaled Tenere out there. I wonder if you could find a used motor.
Chances are what you find will be pretty ugly, but maybe not TOO bad. You will probably need cams (sprockets are probably not available separate), cam chain, tensioner (maybe), cam drive sprocket on the crank. Other than that, you MIGHT be lucky. Worst case probably add some main bearings and the like.
HOPEFULLY, you didn't introduce the piston to a valve.
Doing the work yourself, this might not be THAT expensive.
ac
Chances are what you find will be pretty ugly, but maybe not TOO bad. You will probably need cams (sprockets are probably not available separate), cam chain, tensioner (maybe), cam drive sprocket on the crank. Other than that, you MIGHT be lucky. Worst case probably add some main bearings and the like.
HOPEFULLY, you didn't introduce the piston to a valve.
Doing the work yourself, this might not be THAT expensive.
ac
Out of curiosity I looked up some pricing:
Cam chain: $32
Cam sprocket (replaceable w/out replacing cams): $56
Decompression cam sprocket: $141
I THINK the cam is driven by an $18 sprocket that bolts to the crank, but I am not sure from the diagram.
If the crank is toast it gets ugly: $745 for the whole ASSEMBLY with the con rods and all.
Good luck, take it apart and be careful. Inspect everything. Send the head out for some port work O
ac
Cam chain: $32
Cam sprocket (replaceable w/out replacing cams): $56
Decompression cam sprocket: $141
I THINK the cam is driven by an $18 sprocket that bolts to the crank, but I am not sure from the diagram.
If the crank is toast it gets ugly: $745 for the whole ASSEMBLY with the con rods and all.
Good luck, take it apart and be careful. Inspect everything. Send the head out for some port work O
ac
I was recently quoted by my dealer it would be $500 if they needed adjusting less if the cams didn't have to come out. It was listed as an 8 hour job.twinrider said:
sail2xxs
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I just had the 100K valve check (and adjustment) done on my bike, and it came to $301 before the $50 Yamaha coupon I got for filling out a service quality survey.
Chris
Chris
So how did it go?sail2xxs said:
In fact, if you don't mind, can you give an accounting of how many valves total have been shimmed in your incredible 100,000 mile journey?
I just want you to know that you are directly responsible for my faith in the longterm future of my bike. Simply amazing.
First I want to say thanks for the moral support guys. I felt like my ego had stunk to the size of a ant.
Well, I got to work on the bike a few hours tonight so I thought I would post a status.
Here is a picture of the metal shavings in the bottom of the cam chain tunnel. The black lump in the bottom that that the fine chips are stuck to is the crank shaft position sensor. It has a strong magnetic field.
They are almost a fine paste as you can see on my finger:
Here is the reason it stopped running:
The cam chain jumped off. The cam chain tensioner came apart, and was laying down in the cam chain tunnel. I could not get a picture of it down inside but here are the parts:
In this picture you can see the groves that the chain cut into the side of the case a bit.
But question I still haven't worked out is, did the tensioner fail or was it damaged when the chain jumped off? Cause or effect? Thoughts?
I hope to get a few hours on it in the morning and will follow up.
The good news is that so far the cams look good. I need a lot more investigation to get to the bottom but I am encouraged by what I see so far.
Also I found the washer that went missing so that was not the problem. And so far no other parts that should not be there.
More to come.
John
Well, I got to work on the bike a few hours tonight so I thought I would post a status.
Here is a picture of the metal shavings in the bottom of the cam chain tunnel. The black lump in the bottom that that the fine chips are stuck to is the crank shaft position sensor. It has a strong magnetic field.
They are almost a fine paste as you can see on my finger:
Here is the reason it stopped running:
The cam chain jumped off. The cam chain tensioner came apart, and was laying down in the cam chain tunnel. I could not get a picture of it down inside but here are the parts:
In this picture you can see the groves that the chain cut into the side of the case a bit.
But question I still haven't worked out is, did the tensioner fail or was it damaged when the chain jumped off? Cause or effect? Thoughts?
I hope to get a few hours on it in the morning and will follow up.
The good news is that so far the cams look good. I need a lot more investigation to get to the bottom but I am encouraged by what I see so far.
Also I found the washer that went missing so that was not the problem. And so far no other parts that should not be there.
More to come.
John
Light at the end of the tunnel!!!!
And forget the ego. Stuff happens.
But you did talk me outta ever pulling my cams. (If\when needed)
I'm paying and then holding accountable. How's that for no ego?
I'm too old to care anymore.
And forget the ego. Stuff happens.
But you did talk me outta ever pulling my cams. (If\when needed)
I'm paying and then holding accountable. How's that for no ego?
I'm too old to care anymore.
scott123007
Well-Known Member
You're gunna have some bent valves!?
~TABASCO~
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Wow... Are you going to pull the exhaust and throttle bodies to check the valves? Hopefully the pistons didn't damage anything.
I'd be impressed if he can pull a head to check the valves with the TB and Exhaust still attached to it.~TABASCO~ said:
Unfortunately, if he threw the cam chain, it is very likely at least one piston became very intimate with some valves.
With any luck the damage will be contained to the top end of the motor and the bottom end can be pulled apart for inspection/cleaning only.
ac