Valve/Tappets clearance


Information and questions on GL1200 Goldwings (1984-1987)
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Circlip
Posts: 9
Joined: Fri Sep 18, 2015 5:12 am
Location: England
Motorcycle: GL1200 1985

Valve/Tappets clearance

Postby Circlip » Tue Dec 01, 2015 3:08 pm



Has anyone come across this problem?
I have removed my right hand cylinder head to investigate poor compression and sure enough all valves were leaking also there was no clearance between valve and Tappets on the exhaust valves.after removing the cam carrier I lapped in the valves. Carried out a kerosene test all valves are now ok.
After nipping down the carrier with the cam at TDC the inlet valve Tappets slide nicely and the valves are closed however the exhaust valves are being held slightly open, I've turned the eccentric shafts with a screwdriver and they seem to be in the most favourable position does anyone know how to achieve clearance given these circumstance.
I have tried to be as accurate as possible with the detailes
Thanks



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twocams
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Motorcycle: 1985 GL1200 Aspencade, 2003 K1200GT BMW, 1969 R69S BMW
Sold : 84 V65 Magna, 82 Moto Guzzi, XS 1100 Yamaha,84 Wing Int., 80 650 Special, Only new bike 82 XV750 Virago (Guam),Honda 250,84 R100RT BMW,87 K100 LT BMW,93 K1100 LT BMW, 91 535 Virago, Honda 50

Re: Valve/Tappets clearance

Postby twocams » Tue Dec 01, 2015 4:59 pm

Those are hydraulic lifters. Think they are zero clearance if like a car. Sounds like the plunger inside the lifters maybe stuck?

Twocams

Circlip
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Motorcycle: GL1200 1985

Re: Valve/Tappets clearance

Postby Circlip » Tue Dec 01, 2015 5:10 pm

The way I understand things is the cam operates the Tappets and the lash adjusters combined with springs keep the clearance to zero

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twocams
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Re: Valve/Tappets clearance

Postby twocams » Tue Dec 01, 2015 7:35 pm

That is correct. There is also a little spring in the lifter. If the plunger and or little spring are stuck in with dirt or grime the plunger may not be coming out enough to give your zero clearance. Just a thought from this end.

Twocams

Circlip
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Re: Valve/Tappets clearance

Postby Circlip » Wed Dec 02, 2015 3:55 am

Thanks two cams
I was trying to avoid striping all the top components seems very complicated and I don't have any of the special Honda tools spoken about in the manual, I will have to go for it I think.

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twocams
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Re: Valve/Tappets clearance

Postby twocams » Wed Dec 02, 2015 12:27 pm

How many exhaust valves are you having problems with? Is that just one head or both? Could it be the cam lobs are worn down? How much clearance are we talking about. Sorry Im not much help. I had an 84 Wing that I put 50,000 miles on in 12 yrs and never had the valve covers off. But thats been 10 yrs ago. The 85 I have now, only had a few months and working on the fuel system right now.

Twocams

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wingman12
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Motorcycle: 1999 gl1500 se

Re: Valve/Tappets clearance

Postby wingman12 » Wed Dec 02, 2015 1:17 pm

twocams wrote:That is correct. There is also a little spring in the lifter. If the plunger and or little spring are stuck in with dirt or grime the plunger may not be coming out enough to give your zero clearance. Just a thought from this end.

Twocams

twocams, I know you guys are talking about at 1200 but ever since I got my 1500 (brand new out of the crate) in 99 I have had this ticking noise at 2000 rpm, is it possible that there has been a bad lifter since birth?? the ticking sound is getting louder as the bike get more miles (148,000 now) was thinking of checking out a solution over this winter during hibernation. any ideas would be helpful. thanks :D :D

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twocams
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Motorcycle: 1985 GL1200 Aspencade, 2003 K1200GT BMW, 1969 R69S BMW
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Re: Valve/Tappets clearance

Postby twocams » Wed Dec 02, 2015 2:14 pm

You know, at 148,000 miles I think I would just go out and buy another bike. Surely you have an extra $25,000 lying around.
Just kidding. As an engine wears out so to speak. Tolerances tend to get bigger. The "blood" of an engine is the oil, change often with filter. Hydraulic lifters do collapse. You would have to look that one up. But they dont pump up any more. Sometimes they are just tired,gum up, not enough oil getting to them to keep them pumped up. Sometimes the lifters can be removed and cleaned and work as advertised. But if I went threw all that work I would just replace them, the ones you know are bad. Cams start getting flat spots on the lobes where lifters ride. Cam bearings start to wear which makes the cam shafts start to move around.
Look, feel, measure, replace, thats about all you can do.

Twocams

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wingman12
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Re: Valve/Tappets clearance

Postby wingman12 » Wed Dec 02, 2015 2:33 pm

Thanks twocams, it sounds like my bucket list just go bigger, or maybe I can find the $30,000 laying around under one of my oak trees, I will take a look this weekend. :lol: :lol:

Circlip
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Motorcycle: GL1200 1985

Re: Valve/Tappets clearance

Postby Circlip » Wed Dec 02, 2015 6:25 pm

Hi two cams
I bit the bullet today and pulled the hydraulic adjusters shafts rockers etc and as you said the springs are stuck in the hydraulic adjusters to varying degrees, I've had them soaking in paraffin for a few hours now and they are beginning to ease off I think we will be ok, from what I see the oil in the adjuster just sits there and never replaced
Thanks a mill for your advice saved me a lot of head scratching

Thanks once again for your help
Re
Circlip

Circlip
Posts: 9
Joined: Fri Sep 18, 2015 5:12 am
Location: England
Motorcycle: GL1200 1985

Re: Valve/Tappets clearance

Postby Circlip » Wed Dec 02, 2015 6:56 pm

Hi
In addition I must say that all measurement I have checked are on origin speck, the engine I'm working on is fitted in a trike so no idea of mileage, it was built in 2000 from a donor gl and I must confess I've had it garaged for ten years so im sure that has contributed to the problems, now I know what I'm doing I will remove the left hand head and check this will be easier now I know what I'm doing, it will be awesome

Circlip

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twocams
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Joined: Tue Sep 29, 2015 11:25 am
Location: Grants Pass, Oregon
Motorcycle: 1985 GL1200 Aspencade, 2003 K1200GT BMW, 1969 R69S BMW
Sold : 84 V65 Magna, 82 Moto Guzzi, XS 1100 Yamaha,84 Wing Int., 80 650 Special, Only new bike 82 XV750 Virago (Guam),Honda 250,84 R100RT BMW,87 K100 LT BMW,93 K1100 LT BMW, 91 535 Virago, Honda 50

Re: Valve/Tappets clearance

Postby twocams » Wed Dec 02, 2015 9:04 pm

Make sure you keep things separate. Everything for # 1 cylinder together as well as the other cylinders. Each cylinder has there parts worn in to a certain pattern. I read where there are shims used and available where needed at the tappets. Not all tappets need a shim or were used at the factory. Proceed with caution...... :roll:

Twocams

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Ace1Hunter
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Motorcycle: 1986 GL1200I Interstate

Re: Valve/Tappets clearance

Postby Ace1Hunter » Sun Dec 06, 2015 7:17 am

When a Honda engine sits the valves stick in the guides. Without removing then head the easiest way is to use Honda trans fluid in place of engine oil and rev the engine at hi revs to when the engine is operational temp meaning when the fan comes on. Then put back then engine oil and new filter. This is old trick.

Circlip
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Joined: Fri Sep 18, 2015 5:12 am
Location: England
Motorcycle: GL1200 1985

Re: Valve/Tappets clearance

Postby Circlip » Sun Dec 06, 2015 12:40 pm

Thanks for your reply
After having striped the head and cam holder I discovered that the hydraulic lash adjusters had seized up, after soaking in parrafin for 24 hours and with a little patience I managed to free them all off, I have lapped all the valves in and rebuilt the head, the valves are sitting nicely holding fluid on test and I now have free sideways play on the rockers hopefully this has been a successful rebuild, can't wait to test.

Regards Circlip




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