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valve adjustment

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Buzz View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Buzz Quote  Post ReplyReply Direct Link To This Post Topic: valve adjustment
    Posted: 05 Dec. 2017 at 2:03am
Ran into an interesting scenario adjusting intake valves on an F-head.  Got #1 intake valve at full open position (at toe of cam lobe).  The opposing #4 intake valve was therefore at the heel  of the cam lobe.  In order to get #4 valve to spec, I had to turn adjusting screw to the point where the lock nut no longer had any threads to grab and lock.  I am at a loss to determine why.  Here is pic of the valve adjustment screw.???
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Bruce W View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bruce W Quote  Post ReplyReply Direct Link To This Post Posted: 05 Dec. 2017 at 3:22am
Are you adjusting the exhaust's as well? I would expect so. When you have the side cover off, take a look at the #4 inlet push rod and tappet where they meet, and I imagine you'll see the problem. If you weren't planning on taking the side cover off, loosen the #4 rocker adjustment to get clear of the pocket in the pushrod, slide the rocker arm forward against the spring, and pull the pushrod out. I think you'll see the problem at that point. The side cover is going to have to come off sooner or later anyway. If the tappet is bad, well, you've got a job ahead of you.  BW

Edit to add: The bottom of the tappet and/or the camshaft, where they contact each other, may be worn away. If either is bad, both are.  BW


Edited by Bruce W - 05 Dec. 2017 at 3:26am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Buzz Quote  Post ReplyReply Direct Link To This Post Posted: 05 Dec. 2017 at 11:25am
thanks Bruce. I did adjust exhaust valves as well. I will take a look at tappet and rod. Something has to be worn or broken somewhere to allow this much travel by screw.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bruce W Quote  Post ReplyReply Direct Link To This Post Posted: 05 Dec. 2017 at 6:37pm
Originally posted by Buzz Buzz wrote:

Something has to be worn or broken somewhere to allow this much travel by screw.

There ya go, that's it in a nutshell.  
Does that intake rocker/valve operate as it should, with it adjusted that way?  If the tappet and camshaft lobe have worn each other away, I would expect the lobe to be gone, and there would be little or no opening.  BW



Edited by Bruce W - 05 Dec. 2017 at 6:40pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Buzz Quote  Post ReplyReply Direct Link To This Post Posted: 05 Dec. 2017 at 8:11pm
i wouldn't run it without a lock nut
 When it was on the rocker arm flopped around. It's been running very rough as of late, but no major knocking noises, etc. I will hopefully get a better idea of problem this evening.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Buzz Quote  Post ReplyReply Direct Link To This Post Posted: 06 Dec. 2017 at 12:48am
Ahhh, I think there is something wrong with this push rod.....


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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mark W. Quote  Post ReplyReply Direct Link To This Post Posted: 06 Dec. 2017 at 1:32am
Theirs a guy on you tube that will show you how to fix that. He shows how to fix a bent valve. Something about McDonald's Honey mustard sauce and a 4lb hammer. I'm sure it would work the same for a pushrod.


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Post Options Post Options   Thanks (0) Thanks(0)   Quote Buzz Quote  Post ReplyReply Direct Link To This Post Posted: 06 Dec. 2017 at 1:34am
HA!  I am happy to send this rod to someone with the mustard.  It comes complete with the mushroom in the middle of it.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote WeeWilly Quote  Post ReplyReply Direct Link To This Post Posted: 06 Dec. 2017 at 1:40am
Must have had a stuck valve for that to have happened. You might want to check that valve out before installing a new push rod.

   Jim
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Post Options Post Options   Thanks (0) Thanks(0)   Quote cpt logger Quote  Post ReplyReply Direct Link To This Post Posted: 06 Dec. 2017 at 6:34am
Originally posted by WeeWilly WeeWilly wrote:

Must have had a stuck valve for that to have happened. You might want to check that valve out before installing a new push rod.

   Jim


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Post Options Post Options   Thanks (0) Thanks(0)   Quote Buzz Quote  Post ReplyReply Direct Link To This Post Posted: 13 Dec. 2017 at 2:37am
valve does not appear to be stuck. Installed replacement rod. Re checked all valve clearances and ran her a bit. Seemed to idle decent and took for a ride. Ran rough under load in higher gears.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Unkamonkey Quote  Post ReplyReply Direct Link To This Post Posted: 13 Dec. 2017 at 3:45am
What can I say? I managed to destroy my V6 (It turned into a V4) and a friend that had auto repair shop had a pushrod of mine of mine stuck in a flower bowl for years.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Buzz Quote  Post ReplyReply Direct Link To This Post Posted: 14 Dec. 2017 at 12:53am
spark at all cylinders.  Moved on to check compression.  1 and 3 are great.  2 and 4 are only at about 45.  I suspect cam is worn because #4 valve adjustment required adjusting screw to go further in than others after new rod was installed. 


Edited by Buzz - 24 Dec. 2017 at 2:13am
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