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Author Topic: R1200GSA Cam Adjustment  (Read 517 times)

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Offline FrankS

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R1200GSA Cam Adjustment
« on: May 29, 2018, 03:51:10 pm »
I am looking at purchasing an LC but have a question.

I am told that the LC motor needs periodic cam adjustment.  Apparently the cams go out of sync with each other and this needs to be corrected when the bike is serviced.

Any truth in this?  A little concerning as this could eventually lead to valve damage, not so?
« Last Edit: May 30, 2018, 08:46:17 am by FrankS »
 

Offline Jughead

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Re: R1200GS/A Cam Adjustment
« Reply #1 on: May 29, 2018, 05:19:01 pm »
I am looking at purchasing an LC but have a question.

I am told that the LC motor needs periodic cam adjustment.  Apparently the cams go out of sync with each other and this needs to be corrected when the bike is serviced.

Any truth in this?  A little concerning as this could eventually lead to valve damage, not so?

Correct.  Cams go out of adjustment resulting in vibration and a generally rough running motor.  Unfortunately special tools are required to get the correct alignment.  Unlike the older cams with sprockets that are locked in place, the LC has gears on the ends of the cam that are just held in place by the torque on the bolt..

I doubt if they will go so far out that they will cause valves to make contact with the piston.  Of course if the bolt comes loose, then, yes, you have a problem.  I will post some pics of the ones I have done to show how far out the cams are.
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Offline Battlestar

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Re: R1200GS/A Cam Adjustment
« Reply #2 on: May 29, 2018, 08:09:32 pm »
Had them adjusted on my Aircooled 1200 a few times. Was an easy job on the pre water cooled models.
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Re: R1200GS/A Cam Adjustment
« Reply #3 on: May 29, 2018, 09:00:12 pm »
Had them adjusted on my Aircooled 1200 a few times. Was an easy job on the pre water cooled models.

 :o No adjustment was possible on the aircooled motor cams.  Sprockets were locked in place and could not move.

Franks is not referring to valve clearances or rocker shaft end float.  He is referring to the cam turning in relation to its drive gear.
« Last Edit: May 29, 2018, 09:03:14 pm by Jughead »
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Offline FrankS

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Re: R1200GS/A Cam Adjustment
« Reply #4 on: May 30, 2018, 08:50:32 am »
Had them adjusted on my Aircooled 1200 a few times. Was an easy job on the pre water cooled models.

 :o No adjustment was possible on the aircooled motor cams.  Sprockets were locked in place and could not move.

Franks is not referring to valve clearances or rocker shaft end float.  He is referring to the cam turning in relation to its drive gear.

Yes, I was referring to the cam rotation relative to the sprocket or gear or whatever drives it.  I know on some cars like the Golfs you can get an adjustable cam pulley.  Can this movement not damage valves though?
 

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Re: R1200GS/A Cam Adjustment
« Reply #5 on: May 30, 2018, 10:41:22 am »
Yes, I was referring to the cam rotation relative to the sprocket or gear or whatever drives it.  I know on some cars like the Golfs you can get an adjustable cam pulley.  Can this movement not damage valves though?

I think that if the gear did come loose, the cam would rotate only to the point that it made contact with the valve stems.  At that point it would stop as it required quite a bit of force to open the valves.  Since the drive mechanism for the cam is no longer doing its job, that cam would not rotate any further, thus not opening the valves and putting them in harms way.

Here are a few pics of what the cams look like when they are out of sync.

Cam ends should be in line with one another.  These are out ever so slightly.


Here the alignment tool has been fitted.  This tool should fit snugly over both cams. 


Here is the corrected cam setup, with the alignment tool fitted.


This is how the alignment tool should fit.


The cam position sensor on this bike was also not set correctly.  Arrows should line up with one another.




« Last Edit: May 30, 2018, 10:58:50 am by Jughead »
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Re: R1200GS/A Cam Adjustment
« Reply #6 on: May 30, 2018, 11:15:34 am »
Had them adjusted on my Aircooled 1200 a few times. Was an easy job on the pre water cooled models.

 :o No adjustment was possible on the aircooled motor cams.  Sprockets were locked in place and could not move.

Franks is not referring to valve clearances or rocker shaft end float.  He is referring to the cam turning in relation to its drive gear.
Unless im completely stupid which im not! the Aircooled model 2010+ had exactly the same adjustments done with the same type template tool to adjust.  Just like all the above pics. Maybe different on pre 2010 models.
« Last Edit: May 30, 2018, 11:18:59 am by Battlestar »
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Offline Jughead

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Re: R1200GS/A Cam Adjustment
« Reply #7 on: May 30, 2018, 12:31:55 pm »
Unless im completely stupid which im not! the Aircooled model 2010+ had exactly the same adjustments done with the same type template tool to adjust.  Just like all the above pics. Maybe different on pre 2010 models.

Not completely stupid, no.  Maybe mistaken, but not stupid.

Here is a photo of the 2010 - 2012 twin cam setup.  The sprocket is held onto the end of the cam by the bolt that can be see on the lower cam sprocket.  On the upper cam I have removed the bolt which exposes the locking tab (arrow) to lock the sprocket in place and prevent it turning on the cam.  That sprocket can only be positioned exactly there and no amount of "adjusting" will allow it to turn.
« Last Edit: May 30, 2018, 12:34:06 pm by Jughead »
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Re: R1200GSA Cam Adjustment
« Reply #8 on: May 30, 2018, 01:09:30 pm »
Ok

Basically how i stumbled onto this adjustment on my aircooled was when I had "pinging" or noise eminating from the motor under hard acceleration. The Mechanic did 2 changes

1: Was too load a OEM Fuel map for the bike to run effectively on 93 Octane fuel
2: Second in his words was check the cam timing? He then proceeded to do this adjustment by utilizing what looks likes the exact template to line the top and bottom up exactly the same. In this particular instance my lower ones were both out and were adjusted.

It was a while ago so maybe I misunderstood what he was doing but it fixed my problem.  Pics below are of the the items he adjusted

 
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Offline Battlestar

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Re: R1200GSA Cam Adjustment
« Reply #9 on: May 30, 2018, 01:10:34 pm »
Second pic
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Offline Jughead

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Re: R1200GSA Cam Adjustment
« Reply #10 on: May 30, 2018, 01:22:50 pm »
The only "adjustment" on those cams is to move the sprocket one tooth forward or backward.

It is possible that  one of them was a tooth out.
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Re: R1200GSA Cam Adjustment
« Reply #11 on: May 30, 2018, 01:29:58 pm »
Thank you for the clarity

Sorry for Hijacking the thread
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Offline Jughead

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Re: R1200GSA Cam Adjustment
« Reply #12 on: May 30, 2018, 02:10:06 pm »
Thank you for the clarity

Sorry for Hijacking the thread

Battlestar

It would appear that I owe you a formal apology.

I removed the sprocket from the cam and lo and behold, there is no locating tab on the cam.  So you are correct, the cams can be adjusted.  Never too old to learn, are we?
« Last Edit: May 30, 2018, 02:15:23 pm by Jughead »
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Re: R1200GSA Cam Adjustment
« Reply #13 on: May 30, 2018, 02:32:58 pm »
LOL

No need for apologies. Thats what forums like this are truly for. Info,helping out and spreading knowledge.  All cool by the pool  :thumleft: :thumleft:

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Offline FrankS

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Re: R1200GSA Cam Adjustment
« Reply #14 on: May 31, 2018, 06:59:09 pm »
Thanks guys. Very informative.

Jughead, how long does it take to do the cam alignment?
 

Offline Jughead

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Re: R1200GSA Cam Adjustment
« Reply #15 on: June 01, 2018, 08:17:53 am »
Thanks guys. Very informative.

Jughead, how long does it take to do the cam alignment?

Around 30 min/side.  Valve clearances on the other hand are a bitch on the LC, requiring complete removal of the cams.
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Offline FrankS

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Re: R1200GSA Cam Adjustment
« Reply #16 on: June 01, 2018, 04:10:51 pm »
Thanks guys. Very informative.

Jughead, how long does it take to do the cam alignment?

Around 30 min/side.  Valve clearances on the other hand are a bitch on the LC, requiring complete removal of the cams.

 :thumleft: