Monday, March 1, 2010

R1200GS Adventure: Valve Adjustment

R1200GS Adventure: Valve Adjustment

I spent some quality time with GS today adjusting the valves.

This was not the first time I adjusted the Adventure's valves so it went pretty quick.
 

The R1200 Engine is an exceptional power plant and relatively easy to maintain in perfect working order.
 
The engine lets you know when the valves need a touch up with just a tad more vibration than normal. Adjusting the valves only takes an hour or so start to finish, and the more you do it, the fast you'll get it done.

The Dealership Technicians just make a single pass on each side that gets the valves pretty close, but not truly balanced.

The old adage applies here; If you want it done right, do it yourself.

The engine must be cold to do it right; remove the head guards, sparkplug covers, sparkplug wires, sparkplug's and valve covers. You need to clean the valve covers and cooling fins at the junction of the cover and heads so you don’t get any debris in the engine.

Next get the Right Side at TDC (Top Dead Center) by putting the Tyranny in 6th gear and bumped the rear wheel forward until the Arrow of the Right Cam Sprocket points to the 3:00 position.

If you go past it, just keep going around till you get right; don’t try to bump the engine in reverse; the cam chain tensioners will let the chains go a little slack and it wont be at TDC.

Next use two Feeler gauges for the Intake (Rear) valves and two for the Exhaust (Front) valves.

15mm Intake and 30mm Exhaust gauges.
Determine which Intake Valve is closest to the correct setting then adjust the other intake valve to match the first one.

Next do the same for the exhaust valves. Note Here: Adjusting and Intake valve changes the other Intake valve and both Exhaust valve clearances. And you guessed it, Adjust an Exhaust valve alters the other Exhaust valve and both Intake Valves.

Good news is, as you go back & forth between Intake and Exhaust adjustments, the incremental changes get smaller and smaller until they all match.

Once the Right Side head is done, it time to set the Left side to TDC. The cam sprocket on the Left side has a pump wheel bolted to it so you cant see the timing marks on the Left, so we bump the rear wheel forward until the Right Side Cam Sprocket is 180 degrees out.
 
The sprocket has a rectangular tab the trips the hall effect sensor. The Left side is at TDC when the top surface of the tab is flat level with the ground; you can verify that all four valves on the Left side are open.
 
Now adjust the left side valves to match and balance by going back and forth between Intake and Exhaust valves until they are all feel the same, and same as the Right side.


 




 
 
 
Check the plugs before going back together with it all.
Clean the inside of the valve covers, clean the valve cover gasket front & back and clean up and oil that may run out



Now button it all back up and crank her up.

Go for a ride  :thumb




Later
Technorati Tags: R1200GS - Valve Adjustment - Valve

Source: davedragon.rilysi.com

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