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Re: new project: 1975 Gl1000

Posted: Tue Jul 06, 2021 12:46 pm
by nakedinterstate81
Weak valve springs.
I decided to clean the heads and valve train myself. Cleaned the crud off the valves, checked the lobe and bearing clearances and lapped the valve seats, all looking within specs and reusable.
But, the valve springs are out of spec.
The spring force pressure is supposed to be 113.6 psi for the outer and 63.5 psi for the inner.
I measured 90 psi and 50 psi.
I see the springs are not available anymore.
I this going to be a big problem?

Also, how can I get the points mechanism off the cam shaft to replace the oil seal, and back on?
I have yet to learn how to adjust a points ignition system and am afraid I won't get it back on the right way.

Thanks.

Re: new project: 1975 Gl1000

Posted: Tue Jul 06, 2021 1:32 pm
by gltriker
Remove the capscrew and the complete advancer assembly carefully slides off the camshaft stub. Don't attempt to disassemble the advancer assembly.
note: The advancer assembly is indexed onto the camshaft with a small diameter knock pin . Make sure not to lose it when the advancer assembly slides off.

Re: new project: 1975 Gl1000

Posted: Tue Jul 06, 2021 1:43 pm
by gltriker
nakedinterstate81 wrote: Tue Jul 06, 2021 12:46 pm Weak valve springs.
I decided to clean the heads and valve train myself. Cleaned the crud off the valves, checked the lobe and bearing clearances and lapped the valve seats, all looking within specs and reusable.
But, the valve springs are out of spec.
The spring force pressure is supposed to be 113.6 psi for the outer and 63.5 psi for the inner.
I measured 90 psi and 50 psi.
I see the springs are not available anymore.
I this going to be a big problem?

Also, how can I get the points mechanism off the cam shaft to replace the oil seal, and back on?
I have yet to learn how to adjust a points ignition system and am afraid I won't get it back on the right way.

Thanks.
regarding the valve spring question, read this information from Mike Nixon tumb2
https://ngwclub.com/forum/viewtopic.php?f=54&t=72503

Re: new project: 1975 Gl1000

Posted: Tue Jul 06, 2021 1:50 pm
by nakedinterstate81
Thanks Cliff.

Re: new project: 1975 Gl1000

Posted: Tue Jul 06, 2021 7:42 pm
by nakedinterstate81
It does not want to come off.
Only the front parts with the springs want to move.

Re: new project: 1975 Gl1000

Posted: Tue Jul 06, 2021 9:37 pm
by gltriker
nakedinterstate81 wrote: Tue Jul 06, 2021 7:42 pm It does not want to come off.
Only the front parts with the springs want to move.


Best advice will be coming along soon. ;)
I have very limited experience with my trike's engine, only.
As I vaguely recall from the only time I removed it in 2012 when I was installing my Dyna S system, the advancer assembly on my engine slid off the camshaft stub without a lot of resistance after that one cap screw was removed.

Re: new project: 1975 Gl1000

Posted: Tue Jul 06, 2021 10:03 pm
by CYBORG
I agree. Removing the cap screw should allow it to come off.

Re: new project: 1975 Gl1000

Posted: Tue Jul 06, 2021 10:54 pm
by nakedinterstate81
I removed the cap screw.
The rear ring does not move.
I tapped it gently with a peen.
Should I use a 3 jaw gear puller?

Re: new project: 1975 Gl1000

Posted: Wed Jul 07, 2021 7:44 am
by CYBORG
I would soak the end with a penatrating oil first. From the picture looks to be corroded a little.

Re: new project: 1975 Gl1000

Posted: Wed Jul 07, 2021 6:00 pm
by nakedinterstate81
Yes it was. Soaked it and used flat stock to slightly bang against it.
Now I can fit a new oil seal and bolt it back to the head.
The manual says to apply sealer to the cam holder and cylinder head surfaces.
Why?
Isn't the whole assembly getting oil ?
All I have is Yamabond.

As for the springs, I measured the springs out of my '82 gl1100 motor and they were much closer to the recommended spring force so I used these. Dimensions are the same.

Re: new project: 1975 Gl1000

Posted: Wed Jul 07, 2021 10:20 pm
by wingrider
If you have Yamabond, that was some good stuff! I would save it for more pertinent times. Clean up the end of the cam a bit though. :)

Re: new project: 1975 Gl1000

Posted: Thu Jul 08, 2021 11:29 am
by nakedinterstate81
Thanks. What sealer would you recommend?

Re: new project: 1975 Gl1000

Posted: Fri Jul 09, 2021 9:14 pm
by nakedinterstate81
I still had some gascacinch that I will use for that.

But, while cleaning up the heads, some silicone sealer came out around these plugs :shock:
Are these freeze plugs?
Why was sealer in there?
Did they leak?

Re: new project: 1975 Gl1000

Posted: Fri Jul 09, 2021 9:53 pm
by Track T 2411
They are casting plugs, and although they're not known to leak, I've heard a few instances. I've never seen any type of sealer on the heads I've done...

Re: new project: 1975 Gl1000

Posted: Fri Jul 09, 2021 9:53 pm
by robin1731
Those are casting plugs. They need sealer on them. But silicone isn't a good choice. There really is no need to remove them. So someone must had them out at sometime. Gaskacinch or permatex aviation sealer is what I use.