help! locking nut missing after valve adjustment! By feha (Read 2,766 times)

[feha]

I did my first valve adjustment and must not have tightened the locking nut on the exhaust enough so now its missing! The adjustment screw is still there.  I have no problem running out to get another nut but I think it could be dangerous having that moving chain and various other moving parts and a nut dancing around in there.

I don't see it on the floor or anywhere it could have fallen to OUTSIDE the engine.  Sooooo, how do I get in there and get it out?  Maybe I should get a strong guy to come over and we can shake it on its head and hope it falls out?  Do I need to take the whole engine apart to find it??? Help!

Thanks

[Alleyoop]

OUCH!! You need to try and get it with something like this IT has a magnetic on the end of it and hope you can fish it out.
Alleyoop

www.homedepot.com/p/General-Tools-Ultra-Tech-Telescoping-Magnetic-Pick-Up-Tool-709383/100123584

www.techni-tool.com/810PR012?gclid=CjwKEAjwubK4BRC1xczKrZyj3mkSJAC6ntgrAVFt7X9J0sflSsRkgLjE9ABE6TnDW_OuMs4DHGfAgRoC1p7w_wcB

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[feha]

Thanks for the tip Allyoop. I went and found a telescoping magnet and stuck it all the way in (9 inches or so) and didn't feel the screw. I also drained the oil thinking it may be in there. No luck. What next? open the stator? Any other idea?

[Alleyoop]

No it can only be in the crankcase no place else if it fell down in there. The oil passages are to small for the nut to fit. Check between the chain down by the crank sprocket. Check real good because if it is down there and you run the motor with that nut down there it will cause trouble in river city.

Did you get another nut for the stud? or do you need to get one?

[Alleyoop]

www.ebay.com/itm/ROCKER-ARM-ADJUSTMENT-SCREW-AND-NUT-FOR-GY6-150cc-50cc-QMB139-MOTORS-2-pack-/181084697991

[feha]

Thanks for that Aoop. It looks like from some videos that the nut can only be with the timing chain. Since there is a plastic shield below the timing chain- and since I inspected the chain and it looks perfect- it seems like the only place it could end up is below the plastic guide for the timing chain within the metal box that is the camshaft/crankcase? Is this correct? Is there nowhere else it could fall into? So, Ill keep digging around with the magnet and maybe shaking things around to try to get the nut to fall into a place where I can grab it? Apart from that, do I start removing the crankcase? yikes!

This is a cool look inside:

[Alleyoop]

Let me ask HOW did you actually find out that the nut was missing? Did you ride the scooter after you did the valve adjustments? When you first started it up after the valve adjustment was it clattering or was it nice and quiet?

Knowing WHEN and WHAT caused you to find out that the nut was missing may shed some light as to where it could be.
Alleyoop

[feha]

I left both valves too loose and there was a bunch of clacking and 10mph max speed. I went 20 yards then turned around and went back to the garage.

[Alleyoop]

It takes a few turns counter clockwise to unscrew the nut off the stud So It probably came off within that amount of time, so I am pretty sure it is down in the crankcase someplace. You may have a better shot by taking the HEAD and JUG out and you will then see it. That is better than taking the motor completely apart. You will then have this and can move the piston down to see inside the crankcase. Then all you would need is case and head gasket.
Alleyoop

CLICK ON THE PICTURE TO EXPAND IT:

[feha]

ok thanks. Ill look at that as an option. In the meantime, thinking I would have to take the whole engine apart, I fired it up after getting the valves adjusted according to Haynes manual (.006 intake, .008 exhaust) Seems to work fine for now. Im still worried about that nut going someplace it shouldnt though. Maybe a project for next weekend.

Thanks for all the help.

[Alleyoop]

Good luck lets hope the nut does not move and get between the timing chain and crank sprocket, which would cause a major problem.
Alleyoop