Cam shaft/timing


Information and questions on GL1200 Goldwings (1984-1987)
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seasicksid
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Cam shaft/timing

Postby seasicksid » Fri Dec 06, 2013 8:43 am



I removed the heads so I could fit new valve seals. Ground the valves in. Got a perfect seal. When I re fit the cam shaft and carrier things don't look right. I line up the timing marks (dot and "up"), bolt the cam carrier back down only to find the valves partly open on No 1 Cylinder. When I rotate the camshaft the valves open too much. If I were to fit the head I'm sure they'd hit the piston.
Have I missed or messed something ?

Sid



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virgilmobile
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Re: Cam shaft/timing

Postby virgilmobile » Fri Dec 06, 2013 9:24 am

As I recall,on the left side,when the cam marks line up and at #1TDC,it does push on a lifter and open a valve.
Remember the valve timing is set for the right head ,flywheel mark at #1TDC and the valves are closed.
At that point(#1TDC) the left piston is at the bottom and the valve is open...the right piston (#1) is at the top and the valves are closed..

Yes this is an intrusive head...If the timing belt is misaligned by just 3 or 4 cogs on the cam sprocket,a valve will contact the piston...ALWAYS confirm #1 TDC first...then set each cam to the marks...Install the new belts and roll the engine over by HAND for a few revolutions....Never bump the starter till all is set right and the belt tention is correct...

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virgilmobile
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Re: Cam shaft/timing

Postby virgilmobile » Fri Dec 06, 2013 9:28 am

Also the flywheel mark is under a inspection plug...Top of engine,left side,near the rear of the block,behind the carb area...A large flat head slotted cap...

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seasicksid
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Re: Cam shaft/timing

Postby seasicksid » Fri Dec 06, 2013 1:18 pm

Light bulb moment !! I had it in my head the front left piston was No 1. I'm setting the cam correctly then Virgil? The "UP" and the dot aligned ?

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virgilmobile
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Re: Cam shaft/timing

Postby virgilmobile » Fri Dec 06, 2013 2:05 pm

You got it.1 and 3 on the right side
Up on both.marks lined up.The left side will be pushing on the valve so it's gonna want to roll back.Use a socket in the cam hole and a "C" clamp to hold the cam from turning.

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virgilmobile
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Re: Cam shaft/timing

Postby virgilmobile » Fri Dec 06, 2013 2:09 pm

After you get the belts on,roll the engine by hand ONLY and recheck the marks.
Get them exact.get eye level .Down on your hands and knees if necessary.
Looking from above usually ends up in one cog off every time.
Dont ask how I know. :oops:

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seasicksid
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Re: Cam shaft/timing

Postby seasicksid » Fri Dec 06, 2013 5:23 pm

You're a star Virgil. Thanks. Was sweating a bit there thinking I'd bent something.

Sid

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virgilmobile
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84 GL 1200 I

Re: Cam shaft/timing

Postby virgilmobile » Fri Dec 06, 2013 6:45 pm

Take your time.The engine should be firm when you turn it by hand but not bind up.




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