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-   -   R80g/s Cylinder stud striptease... Well... here we go. (http://www.advrider.com/forums/showthread.php?t=889076)

elmontanero 05-21-2013 07:36 PM

R80g/s Cylinder stud striptease... Well... here we go.
 
STATUS:Finished up assembly, Started and ridden round. Second Valve adjustment done, carbs tuned and 20 miles ridden since rebuild. Happy so far. I think I finally made sense of the Harmonizer for an Airhead. Rode sweet!

Skip to post two for Striptease explanation... here's the wind up:
I've been pretty quiet on here for a while and while some folks would reckon that all was well in g/s land you'd be dead wrong. Had a little trouble here, little mess there with the bike back in September/October. Tuning and such - all squared away. Then, as indicated on the title - doing a valve adjustment and re-torque time for the head. Left cylinder top exhaust just wasn't having it. Kept spinning - no tightening - just turning.

History: heads have been off the bike previously for Pushrod seals, bike has in the neighborhood of 60k miles. De carboned the heads the last time till they looked like such:
https://lh3.googleusercontent.com/-L...2/IMG_0346.JPG https://lh5.googleusercontent.com/-u...0/IMG_0352.JPGhttps://lh3.googleusercontent.com/-v...0/IMG_0350.JPG
After that all went together - ran like a Swiss Watch and even sounded like one too. Quiet and smooth. Ah Airhead nirvana....:norton
Slight discoloration near the cylinder base, prehaps blow by from the joint... well that's odd. Forget it and move on, bike runs fine. Then the niggly things like pawl spring, carbs, coil, all that crap eventually needs love- back to well enough. Now this...
So I will admit that I put it aside and rode the Oilheads (gasp) but won't admit how long I didn't work on it. Went down tonight to finally deal with it... all the crap that has to be disconnected or removed done. Valve cover off, take off all the nuts and remove rockers.. yep, threads and then some of the stud showing only on that one ... "so off with the head", and cylinder comes off too. Looking like this now: Left side:
https://lh4.googleusercontent.com/-Q...0/DSCF7015.JPGhttps://lh3.googleusercontent.com/-a...0/DSCF7021.JPG

elmontanero 05-21-2013 07:41 PM

And here's the STRIPtease part: that stud looks like such: https://lh6.googleusercontent.com/-a...0/DSCF7023.JPG
Not wiggly, not threading out nor taking the torque.

So I've read all the threads on Helicoil and timesert and utI'm gonna pass on getting into that argument. I will be going with a jig because I'm scared and sad....

What's the best way to get the stud out.. put back the parts and just keep turning till all comes free?

Lock two nuts together andspin it out?

Take the bike to the nearest qualified mechanic since I probably ham fisted it with a cheap torque wrench?

And to you folks who are holding your heads in shame.. this is my garage now.. https://lh4.googleusercontent.com/-E...0/DSCF7034.JPG
Not the easiest location about a 40 yard walk to it.

elmontanero 05-21-2013 07:43 PM

Some panic as to having heads rebuilt, new rings.. all the usual worry beads stuff. :shog:shog:shog Should the cylinder bases and heads be machined flat?
Right side looks like this showing similar blowby do you think I gotta get in to that one too?
https://lh3.googleusercontent.com/-U...0/DSCF7032.JPG
Summers here in a month and I'd rather not spend a bundle on bike unless needed... vacation is sacred to a teacher.

hardwaregrrl 05-21-2013 08:05 PM

Rent the jig.....
 
....from Jeff here. Used a similar one recently and it was a breeze. Remove the stud by locking 2 nuts together.

Here is my account

elmontanero 05-21-2013 08:20 PM

Quote:

Originally Posted by hardwaregrrl (Post 21462262)
....from Jeff here. Used a similar one recently and it was a breeze. Remove the stud by locking 2 nuts together.

Here is my account

Thanks, off to some reading.

Edit.. do you recommend the HPD or the Northwoods then? seem like quite different inserts.. ut oh.. might be falling into that trap...

hardwaregrrl 05-22-2013 04:50 AM

Quote:

Originally Posted by elmontanero (Post 21462373)
Thanks, off to some reading.

Edit.. do you recommend the HPD or the Northwoods then? seem like quite different inserts.. ut oh.. might be falling into that trap...

I like the HPD inserts much better.

Dreossi 05-22-2013 05:59 AM

Jig is a good idea... Easily made with some decent ply wood. Remember if its an upper stud there is an oil galley that supplies the rocker with oil. You must not plug it. I just finished the same repair on my gs, used a keen sert. I removed one of the pins, enlarged the grove on the outside of the sert, and lined that up with the oil galley. Only locktite behond the oil galley to ensure no plugging.

Other things that worked for me, grease in drill bit grooves to trap shavings. Only drill a wee bit, clean bit, re grease, drill again. Same with tap. Clean everything with brake cleaner, let dry, check oil galley is not plugged. check the inside of you newly tapped case for filinga with your fonger, there will be some bits there. I used high heat locktite, again, behind oil hole in crank case. I let mine cure for a coulple of days before assembly. Use a decent torque wrench, 25 lb max, etc.

I started bike up and ran it with rocker cover off it for a spell... Just to make sure oil galley not plugged. This also ensures any aluminum bits get flushed out of your engine...change oil and filter after a short idle.

With any luck you are away, good luck!

elmontanero 05-22-2013 10:46 AM

Quote:

Originally Posted by hardwaregrrl (Post 21463907)
I like the HPD inserts much better.

So... does anyone out there rent out their HPD jig?

R-dubb 05-22-2013 08:09 PM

That exhaust valve appears to be pretty seriously recessed. Have you considered having the heads done?

elmontanero 05-22-2013 09:56 PM

Quote:

Originally Posted by R-dubb (Post 21471337)
That exhaust valve appears to be pretty seriously recessed. Have you considered having the heads done?

I have... thanks for the feedback. Money's not flowing, but if it has to be done.

supershaft 05-23-2013 12:27 PM

When repairing the top threads, the work really needs to be vacuumed afterwards with a strong vacuum. Don't rely on just grease to catch all the metal shavings. Behind the stud holes is the oil galley that the installed stud itself blocks making the small hole above the stud flow oil. Don't leave a bunch of crap there. It will migrate all through your engine and ruin it. I have seen this happen a number of times. The left overs F up the oil pump and the rest is down hill from there. Good luck!

elmontanero 05-23-2013 01:17 PM

Thanks SS... gonna be a while to get in there. With needing heads rebuild, I'll be having a bit of time. I'm going to pick up the gaskets etc from a shop I'm loyal to.

So determining when to change rings....?

elmontanero 06-01-2013 09:57 AM

Not looking forward to pouring money into the heads... Anyone with used set or rebuilt set willing to sell? Spotted these on E- bay:

http://www.ebay.com/itm/1985-R80-Mat...c8d412&vxp=mtr

What say you good folks?

SOLO LOBO 06-01-2013 10:22 AM

The heads on my G/S that had a supposed 21K miles had severely worn valve guides...

I think the valve kit from Motobins including 4 valves, springs, retainers and high-temp guides as about $200, and the head work about that again.

Don't know about fixing the recession as mine were fine

elmontanero 06-01-2013 02:10 PM

G,
BMW or Intervalves? I know there's a debate, Just wondering what you went with.


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