Messed up push rod and rocker in my 460 - 460 Ford Forum
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post #1 of 8 (permalink) Old 06-22-2019, 07:17 AM Thread Starter
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Messed up push rod and rocker in my 460

Hi, Yesterday I went to set the lash on my 460 that I have in a Cobra. It is a mechanical solid roller setup and has all comp cam valve train parts. The rockers are blue Ford AVO 1.73.

I was checking the lash and I got to one of the exhaust valves and found just over 0.200. It was so loose the rocker was basically floppy. I was able to see the end of the push rod and under side of the rocker was totally hammer'd. I pulled the intaked figuring it was a problem lifter or maybe cam issue. I pulled the lifter out to get a good look and both the lifter and cam look great. I see no problems with either of them. Best I can tell the valve and springs are fine also. There doesn't seem to be any hang up. The rocker stud was seated all the way also.

I think I caught this early as metal flake/bits are at the top of the cylinder near the problem area but I have no idea what caused it!

The rods are one piece. I don't know if it was maybe faulty? Or possibly the steel cup that the rod sits in on the rockers went bad?

Here are some pics..... Thanks in advance!


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post #2 of 8 (permalink) Old 06-22-2019, 10:08 AM
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Are you using guide plates, if yes do they show unusual wear patterns? Maybe the push rods worked themselves loose and caused this problem. Maybe you lost an end cap on the rod.

1956 Ford F100...466/C6, Edelbrock aluminum heads and Preformer intake w/750cfm carb, Comp. cam , H/S roller rockers, MSD lighter, KB flat top pistons, Currie rear end, B & M shifter, tubbed, Ididit column
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post #3 of 8 (permalink) Old 06-22-2019, 10:13 AM Thread Starter
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Yes, there are guide plates. Nothing unusual that I can see. The pushrod is a single piece comp cam 7934. Maybe it wasn't hardened all the way?
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post #4 of 8 (permalink) Old 06-22-2019, 11:40 PM
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you need to check your lash more often, it should of been missing,and not running right,which means it should of been caught on last fire up. you might not be setting them correctly
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post #5 of 8 (permalink) Old 06-22-2019, 11:42 PM
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any harden push rod will beat itself to death when ran loose for a while

RICH
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post #6 of 8 (permalink) Old 06-23-2019, 03:16 AM
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Why does the roller end have damage also? Just from wobbling around from being so loose?
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post #7 of 8 (permalink) Old 06-23-2019, 06:21 AM Thread Starter
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Yes, just from being so loose.
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post #8 of 8 (permalink) Old 06-27-2019, 08:04 PM
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When was the last time the lash was set? If recently, it could have been set with the pushrod NOT seated in the cup. Would not take long to create that kind of damage.
If it's been awhile, and the "miss" was slowly getting worse, probably need to check the cam lobe for excessive wear.
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