Why do I need to adjust my valves every 200 miles???

the only other thing it can be is a lobe going away, which in turn starts wiping out the follower, which creates more lash. but if the head has pressed in seats i would guess it is a seat moving, not the camshaft going away. esp if it is happening with more than one valve

has this thing seen a lot of heat?
 
not alot of heat. 1500 maybe 5 times at the track for not very long at all. i dont really beat on this thing much
 
SCHOOL BUS said:
ok back on track.


so what do yall think i should do first?

i was thinking:
check lash.
document which valve(s) are loose or tight which cylinder etc for diagnosis purposes.
pull push rods, check to make sure straight
put rods back in rockers on,
lash valves with NEW nuts






i cant think of anything else. what would yall check for while in there?
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Im sure you know this but remember when you put the little "bridges" back on to have the nipple facing out. Not that it may make a difference in lash just my .02
 
I just want to confirm before tmrw..

I set my lash on Tues. and must have gotten some of them too tight because I'm getting that wierd hollow popping noise coming from the Air Filter as well....It's never done that..What exactly is happening??

It seemed to run/drive fine though...

I'll re-set them tmrw. I guess...
 
Ya. Most likely set them to tight. I had that happen to me once. Didn't hurt anything that I could tell but it sure did sound bad.
 
Here is something you can try. When setting your valves you can hold your wrench tight on the adjuster while turning the engine by hand. (It helps to have someone else turn it). As the lobe starts to come up to the top it should feel nice and smooth. If a lobe is flaking on the cam you may feel it in the wrench. You'll feel a roughness or crunchiness in the movement. You can also take a look at the valve stems in relation to the others, If one is higher or lower than the rest it's a good sign that a seat wants to drop and cost you lots of money.
Good luck.
 
Make sure you hold the alen wrench steady when you tighten the jam nut, David. If you take the allen off to tighten the nut it can pull it tighter than it should be.
 
UNBROKEN said:
Make sure you hold the alen wrench steady when you tighten the jam nut, David. If you take the allen off to tighten the nut it can pull it tighter than it should be.
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Yeah, I got in a hurry....Thats what must have happened!!!

:bang
 
I leave the feeler gauge in there and check the lash after I tighten the nut. You'd be amazed how much that nut can move the allen head and you not even feel it.
 
BgBlDodge said:
I leave the feeler gauge in there and check the lash after I tighten the nut. You'd be amazed how much that nut can move the allen head and you not even feel it.
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its good to double check your work (or triple check) but its hard on the gauges if the adj does try to spin when you tighten the lock nut

you cant ruin the feeler gauges if you pull em out while tightening the lock
 
Tyler I'll be calling you on Sunday to let you talk me thru it. I just need to find a cummins dealer to get the nuts
 
BgBlDodge said:
I leave the feeler gauge in there and check the lash after I tighten the nut. You'd be amazed how much that nut can move the allen head and you not even feel it.
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that's what I do... I neglect setting the valves on my trucks, but I was religious about it on my compressor fleet. I would also err to the loose side to give the valve a hair more seat time. those 8.3CGTA's run HOT! :o
 
UPDATE: me and chris at relentless looked at it today after I lashed them a week ago. We stuck a dial indicator on it and definately have worn cam lobes. We only checked intake/exhaust on number one and intake on number two. Hamilton told me should be close to .235 intake & .298 exhaust. Number 1 cylinder was .220 and .278. Would the heavy springs be causing this? They are pdr 90's. I don't remember what zach said the seat pressure on em were. Chris said he's never seen a worn cam lobe since he's been in business in 2002. And he's built some very powerful trucks ( I believe first common rail in the 13's 12's 11's and 10's and first to 1000hp)


Zach, looks like you'll be getting a call about a big stick
 
Sorry to hear the bad news bus. Luck of the draw I guess... well at least you will end up with a good one in there
 
I ran hamilton springs for a couple of months on my stock cam with no problem and I know people running f1 springs on stock cams and it's not wearing theirs out so I doubt that's your problem. Sorry to hear that bud.
 
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