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Valve tapping

jsandidge

jsandidge

Forum Sage
Past Site Supporter
I have a tapping noise coming from under the valve cover. I think it is one of the cam lobes tapping on a shim. When I adjusted clearances last year, #1 intake was loose with a 2.45 shim measuring .11 mm. I put in a 2.50 shim. I ran it that way all last year. I just checked them again, and #1 intake was tight, so I went back to the 2.45. It now measures .06 mm, but sounds loose and noisy. Could something be stuck in there somewhere causing the shim or bucket not to seat properly? I haven't removed the cams or buckets, and I followed the Suzuki factory method for checking clearances (not the Clymer method).
 
If the clearances are right, you should be able to hear all the valves. Just a light clatter. The proper sound is usually compared to a sewing machine. If there's something banging out of time with the rest, there may be something sinister going on.
 
You could have a bucket that is sticking. With the lobe in the measuring position it should turn freely. When the valve is coming back up from fully open you might find a sticky spot.
 
Brendan W said:
You could have a bucket that is sticking. With the lobe in the measuring position it should turn freely. When the valve is coming back up from fully open you might find a sticky spot.
Click to expand...

I was thinking something like this. What would be the best way to check and fix this situation?
 
Open up as for a clearance check. See if the bucket is free to turn by pushing it at the cutout for lifting the shim. Rotate the crank by hand and see if that bucket behaves differently to the others on the up stroke in particular. As it's #1 you could possibly see the valve head as it moves. If the bucket is free it might be the valve that's sticking.
 
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