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Author Topic: 428CJ lifter clatter  (Read 4549 times)
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GrouperTrooper
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« on: July 06, 2016, 02:14:02 PM »

I recently rebuilt the original 428CJ mostly stock but with a mild Comp Cam kit (CL33-224-3) with .268/.268 duration and .494/.494 lift with the stock valvetrain. Runs great but I get valve clatter after a few miles of warm up. I did not think a cam with lift less than .500 would need longer pushrods. any ideas?

Thanks

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Jayson

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« Reply #1 on: July 06, 2016, 02:28:17 PM »

did you prime the pump and run it until you got oil in all the lifters?

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GrouperTrooper
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« Reply #2 on: July 06, 2016, 07:29:11 PM »

Yes, pre-prime pump, heavy zinc purple oil, proper break-in (2500 rpm plus for 30 minutes). No other issues at all on the engine.

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Jayson

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« Reply #3 on: July 07, 2016, 03:12:43 AM »

What oil pump did you use

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acman63
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« Reply #4 on: July 07, 2016, 07:41:26 AM »

I recently rebuilt the original 428CJ mostly stock but with a mild Comp Cam kit (CL33-224-3) with .268/.268 duration and .494/.494 lift with the stock valvetrain. Runs great but I get valve clatter after a few miles of warm up. I did not think a cam with lift less than .500 would need longer pushrods. any ideas?

Thanks

did you replace the pushrods?  You might check length.  You said valve clatter,  maybe expound on that. .  Theres a lot of variables.  Check timing!   What Octane fuel are you running?  Does it do it at idle after warmup?

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Tom H
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« Reply #5 on: July 07, 2016, 09:54:24 AM »

Try a different filter.

The Nut

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« Reply #6 on: July 07, 2016, 12:10:43 PM »

What oil pump did you use
?

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« Reply #7 on: July 07, 2016, 01:26:47 PM »

I recently rebuilt the original 428CJ mostly stock but with a mild Comp Cam kit (CL33-224-3) with .268/.268 duration and .494/.494 lift with the stock valvetrain. Runs great but I get valve clatter after a few miles of warm up. I did not think a cam with lift less than .500 would need longer pushrods. any ideas?

Thanks


       Non adjustable valve trains like you have are very sensitive to component changes. This is why FE owners often switch to 428 adjustable rockers and pushrods. This is a difficult one to diagnose over the internet as there are too many variables as mentioned by acman63. The noise getting louder as the engine warms up is odd to me.
       Randy

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« Reply #8 on: July 07, 2016, 03:34:09 PM »

I once had a similar problem with new Comp cam in a small block.
Thought it was a lifter problem but turned out to be valve springs - swapped to Comps recommended and the clatter went away.


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1967 Eight Barrel
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« Reply #9 on: July 07, 2016, 05:41:31 PM »

That's a pretty mild grind. I wouldn't think the base circle changed enough to cause pushrod issues. Low oil pressure?

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« Reply #10 on: July 09, 2016, 12:54:43 PM »

what eight barrel said, whats your actual oil pressure from first start up to problem


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« Reply #11 on: July 09, 2016, 01:27:43 PM »

Hello Grouper, be a Trooper and head on down to your local auto parts store and pick up a bottle of some oil thickener like Lukas- Stp- Bardahl etc. This is the fastest easiest way to see if you have a low oil pressure problem, don't rev the hell out of it but rev it gently as it builds temp. and see if the noise is quieter then before I'm guessing it might . For 5 bucks it is a cheap starting point to see what your engine is doing. Then worry about lifters not pumped up, bent pushrods, rockers not adjusted properly. Start with the easy stuff first then come back with some questions and we will help you. Wink

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GrouperTrooper
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« Reply #12 on: July 10, 2016, 12:16:26 PM »

Hi all, let me see if I can answer some of your questions...
Melling O/V oil pump
Stock pushrods and rockers
not ping (pre-detonation) from too much timing, lifter/valve train noise
Oil gauge is the factory FoMoCo so the exact psi is impossible to read with it. Gauge reads 3/4 up at start up and drops just a smidgen when it warms up and the oil thins. It's only got about 100 miles on it or less from rebuild at this point.

I'll try an additive to the oil as suggested but as there is no adjustment to the rockers I can cross that off the list.
After that I'll pull a cover for a visual. I imagine I  should not be able to spin a pushrod just after shutdown on a normal set up.

Thanks for the help   

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Jayson

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« Reply #13 on: July 10, 2016, 06:53:38 PM »

Just by a weird chance...there is a small plug that could be missing, it would leak internally, it's at the end of the lifter oil galley, they real only way to tell if it's missing, is to remove the distributer and prime the engine, looking down in the distributer hole, if the oil pours out, then just your lifter galley isn't building correct pressure. The gauge will still read good pressure, but the lifters will starve.


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« Reply #14 on: July 11, 2016, 02:38:10 PM »

Just by a weird chance...there is a small plug that could be missing, it would leak internally, it's at the end of the lifter oil galley, they real only way to tell if it's missing, is to remove the distributer and prime the engine, looking down in the distributer hole, if the oil pours out, then just your lifter galley isn't building correct pressure. The gauge will still read good pressure, but the lifters will starve.


And there is also a plug behind the dizzy that could also do the same..

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