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Bent pushrod

Posted By dennis22 2 Months Ago
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dennis22
Posted 2 Months Ago
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Hi guys,

just had the F100 running and driving for the first time and the drivers side head had a tapping noise one day on start up.

i pulled the rocker covers off and found 3 pushrods had dropped out. One had disappeared into the valley, one got jammed in the hole and the other was pushed aside. The jammed one is bent, now I’m wondering what damage could have it done to the cam?

I swapped out the nut adjusters to the hex head type on the drivers side when I bought new rockers but there were only 8 in stock so I didn’t do the passengers side.

the new adjusters had loosened up and that’s why the push rods dropped out, the passenger side with the interference thread are still tight. I must not have cranked the new adjusters tight enough. Anyway I’ll be going back to the original interference adjusters.

You can see the 4th adjuster Is about to wind off(bent pushrod)












Thanks, Dennis.

56 F100 - 272 Y Block
Sydney, NSW, Australia.



Hoosier Hurricane
Posted 2 Months Ago
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I'm sure it is a misprint, but to be sure there should be 12PINS between the dots on the sprockets, not 12 links.  Only should b e 6 links.

John - "The Hoosier Hurricane"
http://www.y-blocksforever.com/avatars/johnf.jpg
Ted
Posted 2 Months Ago
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Without knowing more as to what happened, I’ll just guess that the locking nuts were simply not tightened enough. Replace the bent push rods and try it again.

Lorena, Texas (South of Waco)


dennis22
Posted 2 Months Ago
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Thanks Ted,

Exactly what happened. That’s the plan, fingers crossed. I’ve never had a bent pushrod before so I guess I’m worried if there has been damage to the cam. I’ll check the lift once everything is back together.


Thanks, Dennis.

56 F100 - 272 Y Block
Sydney, NSW, Australia.



darrell
Posted 2 Months Ago
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these nuts have to be ringing tight.i had them fall of a 57 merc many years ago.learned my lesson.
dennis22
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Yeah I think I will go back to the interference type adjusters, just to be safe (save human error)


Thanks, Dennis.

56 F100 - 272 Y Block
Sydney, NSW, Australia.



MattsY
Posted 2 Months Ago
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Thinking out loud here, but I wonder if a little green loctite would help?
dennis22
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Yeah I was thinking the same thing.

Does anyone know where to get tubular pushrods from- 5/16 by 8.125 long


Thanks, Dennis.

56 F100 - 272 Y Block
Sydney, NSW, Australia.



PF Arcand
Posted 2 Months Ago
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I'm hardly an expert on rocker issues..but going back to interference adjusters is not a guarantee of no problems, from what I've garnered from other blurbs.  They've been known to not hold also, especially if old & well used. There was at one time oversize thread ones available apparently, but I doubt U would find them now.. Good luck..      


Paul
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Every racing engine and almost every street engine I’ve ever owned has had adjusters with lock nuts. I’ve even made aluminum lock nuts to save weight. If I was building a “scrubby” for the street it would have T&D’s or Jessel’s to get rid of posts. If you need to eliminate adjusting, build an old Oldsmobile with hydraulic lifters and fixed rockers.

56 Vic, B'Ville 200 MPH Club Member, So Cal.


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