Engine clink

[Guest]

I'm currently workin on an 82 gs450. Everything seems to be workin fine except for a little clink I'm getting from sounds like, based my block of wood stethoscope, the right exhaust valve. It seems fairly slow. A clink per second, but sounds so clear. I was thinkin it could have been the cam chain tensioner. Tightened and loosened it, but the clink was unaffected. I had adjusted the valves about a month ago with no noise. I pulled the valve cover and checked the gaps. All were in spec and chain seemed good. The noise went away for a couple days then started back up. Im currently trying to upload a video. Any advice is much appreciated.

[NvMessner]

Here's the link. Sorry for the delay.

http://youtu.be/Tl_CxdBN15Y

[jeffgs]

Does it have a slight miss or a shake when it does it? Vacuum gauge?

[tom203]

"..thinkin it could have been the cam chain tensioner. Tightened and loosened it, "
just how did you do this? Make sure you understand how chain tensioner works - it's simplicity confuses folks.

[NvMessner]

I Loosened the lock nut and twisted the screw on the back side. The other side has the spring knurled nut...I believe it's called.

[tom203]

Hmmm. Head to this link to explain how to set/release tensioner for happy motoring. The slotted lockscrew on plunger shaft must be backed off and held in place with locknut. The knurled knob/spring gizmo pushes on ball which lets plunger shaft push out against chain-but not push back. You might have reset tensioner incorrectly and it's anxious to move out and take up chain slack, best to check.

http://members.dslextreme.com/users/storagecliff/images/engine_odds-n-ends.html#A06

[NvMessner]

Thanks I'll give er a shot.

[Larry D]

It is a automatic tensioner, after you get it reset, don't mess with it. Hopefully you haven't skipped a tooth.

[NvMessner]

So I removed and cleaned the tensioner. It looked to be in decent shape...as far as I can tell. I followed the directions on engine odds and ends, got it all back together and still got that click!

[tom203]

I'm stumped with the once per second click stuff. Since you said it seemed from right exhaust valve side, how about disconnecting/extracting tach drive gizmo ?

[NvMessner]

Me too. Thats why i posted the video....it's weird, it seems like a slow click for any valve stuff. Tach gizmo?

[tom203]

The tach drive runs off gear on exhaust cam next to right exhaust valve. It's a rinky dinky way to drive things at 90 degrees but it works . I'm wondering if the teeth aren't meshing correctly at times , or chipped?

[NvMessner]

Hmmm. I'll give er a look. Thanks for the help pard.

[tom203]

At 1200 rpm engine, camshafts are turning 600 rpm or 10revs a second - too fast for once a second click stuff. But a point on chain itself would be considerably slower to make full "loop" ,i.e. pass same point- maybe a chain link is hitting something.

[NvMessner]

That's a good point. Anything come to mind that could be makin contact?