Dead lifter??? - Team Camaro Tech
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post #1 of 14 (permalink) Old Jul 20th, 06, 06:48 AM Thread Starter
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Dead lifter???

My small block with hyd cam (several years since rebiuld ~25.000 miles) started ticking rather loudly. I pulled the valve cover and found the #6 exhaust rocker too loose. I pulled the rocker and push rod and it looks good. I re-assembled and was resetting lash with the engine running. AS the slack was taken up in the rocker, the tapping would go away for about 3 seconds then come back. I would tighten more and the same thing. I did this a few times then figured the lifter was not staying pumped up. I loosed it up until the push rod was spinning again and left it there. I re-lashed the whole bank and that seems fine other than 2 other push rods not spinning.
1) Replace all the lifters?
2) How much can I drive this without hurting something. This is my daily driver Impala.
Thanks.

J Early
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post #2 of 14 (permalink) Old Jul 20th, 06, 09:50 AM
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Re: Dead lifter???

I've done this before. Adjust the lifter until all the slack is gone, then adjust as a solid lifter, 0.008-0.012 inches hot. Drive the car. This will get you back on the road and buy some time.

Later, you should at least exchange the lifter for a new one. Some people replace all of them because of the reasoning, if one goes, when will another lifter go bad?

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post #3 of 14 (permalink) Old Jul 20th, 06, 10:06 AM
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Re: Dead lifter???

Are you sure the rocker stud is not pulling out of the head?

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post #4 of 14 (permalink) Old Jul 20th, 06, 11:13 AM
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Re: Dead lifter???

.

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post #5 of 14 (permalink) Old Jul 20th, 06, 12:50 PM
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Re: Dead lifter???

Check out this thread. It may be a flat lobe on the camshaft.

https://www.camaros.net/forums/showpo...04&postcount=7

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post #6 of 14 (permalink) Old Jul 21st, 06, 06:59 AM Thread Starter
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Re: Dead lifter???

I do not think the stud was pulling out since I could tighten the rocker and the tapping would go away for a few seconds then come right back, like the lifter could not stay pumped up. With the eye I can see good movement of the rocker but I could put a dial indicator on it to measure lobe lift. I still think with the lifter not staying pumped up as I tighten the nut likely means the lifter is the culprit and the spring, rocker stud and cam lobe could be ruled out. But that is my shade tree mechanic thought! Please let me know if this sounds right since I plan on digging into this tonight (replacing all lifters). Thanks.

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post #7 of 14 (permalink) Old Jul 21st, 06, 07:20 AM
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Re: Dead lifter???

Close analysis - compare suspected stud height with neighboring studs if stud movement is suspect.

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post #8 of 14 (permalink) Old Jul 21st, 06, 07:25 AM
 
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Re: Dead lifter???

Check cam lobe when apart and oil for ground metal.
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post #9 of 14 (permalink) Old Jul 27th, 06, 06:14 AM Thread Starter
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Re: Dead lifter???

Changed all lifters and the engine sounds good now, more quiete than ever. The one lifter was dished a bit. The rocker on that lifter still moves well but I have a feeling it is less than it should be ( a little worn). Anyway, My problem now is that my gas milage is HORRIBLE. I replaced the carb a few months ago and tuned it well and was getting 15 MPG. Now I dout I am getting 10MPG. I did not touch the carb..did not even unbolt it from the intake. I lashed the engine cold and it is nice and quiete like I said. I have the initial timing set just short of where it will chatter (about 12 degrees BTDC). The idle is smooth but seems a touch lower than it was before. Any ideas??
I thought a vacum leak would cause an variable idle speed?

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post #10 of 14 (permalink) Old Jul 27th, 06, 12:03 PM
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Re: Dead lifter???

Quote:
Originally Posted by Everett#2390
I've done this before. Adjust the lifter until all the slack is gone, then adjust as a solid lifter, 0.008-0.012 inches hot. Drive the car. This will get you back on the road and buy some time.

Later, you should at least exchange the lifter for a new one. Some people replace all of them because of the reasoning, if one goes, when will another lifter go bad?

Speaking of solid lifters, I checked mine cold. They were all about .024. Is that good or bad?
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post #11 of 14 (permalink) Old Jul 27th, 06, 12:08 PM
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Re: Dead lifter???

Quote:
Originally Posted by J early
The idle is smooth but seems a touch lower than it was before. Any ideas?? I thought a vacum leak would cause an variable idle speed?
Have you used a vacuum gauge to adjust tyhe mixture screws on the carb? They may be alittle rich, screwed out too far.

A vacuum leak will show up as a lower numerical steady value.

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post #12 of 14 (permalink) Old Jul 27th, 06, 01:05 PM Thread Starter
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Re: Dead lifter???

I used a vacume gauge to tune it a couple months ago. Is there any reason why i should have to do this again?
I would have to guess that since my idle is a little lower that the vacume is a little lower.
Will a vacum leak effect gas milage that bad?

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post #13 of 14 (permalink) Old Jul 27th, 06, 01:31 PM
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Re: Dead lifter???

Lifters don't dish for nothing. You are buying time...Select your new cam and lifters ahead of time.. Before you said the lifter was dished I was gonna recommend to pull that lifter and open it up and clean it out. Sometimes the orfice and piddle valve become clogged and they can't take on oil or keep it pressured. But you found your problem.

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post #14 of 14 (permalink) Old Jul 28th, 06, 06:01 AM Thread Starter
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Re: Dead lifter???

zdid,
I know you are right, and I am buyng some time. Hopefully more than less. This car is going to get torn down eventually and I would love to last a few thousand mles but I dout I will get that lucky.

As fas as gas milage.. I sprayed carb cleaner all around the intake seams with no change in idle.
When putting the distributor back in I did get off a tooth or two and I had one hell of a backfire when I hit the key. The Holley avenger has power valve blow out protection but I wonder how foolproof this is? A blown PV would accout for crappy gas milage, right? I will start a new thread since this is realy a new topic, thanks again.

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