Bent Push Rods

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Jun 19, 2013 | 12:39 PM

bchnut

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Joined: Aug 2009

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Bent Push Rods

My truck threw a #3 contribution fault months ago and I have been throwing parts at it since. Ficm rebuild, Injector and the latest new push rods which where slightly bent on #3 cylinder. I did notice when I replaced the push rod that the new one was shorter than the original. when I asked the Ford guy he said that it's the way they make them now. I am at the point were I just want to get rid of the truck (financial reasons) other wise I love the truck. I just don't know were to proceed in the repair process anymore without going to a professional. Any clue ?

Jun 19, 2013 | 03:54 PM

m-chan68

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Joined: Mar 2010

Posts: 5,504

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From: Woodbridge, Ontario, CA

Quote:

Originally Posted by matt

I'm being told by a fairly reliable source (an engine rebuilder) that OEM 6.0 pushrods and the current part number 8C3Z-6565-B are different lengths, namely the the new pushrod is .050" shorter. I am aware it is also a 6.4 pushrod and the 6.0 number crosses over to the 6.4 number.

I was also told this is a reason for 6.0 lifter failure among other things. OEM 6.0 pushrods are too long and it causes the lifter to bottom out internally.

The portion of the quote highlighted in bold red should be considered very interesting information to ponder.

Jun 19, 2013 | 04:04 PM

MC5C

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Joined: Jun 2012

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As soon as I read that I thought "deck the head a tad, valves move up, little bit valve job, valves move up, and all of a sudden the push rod is too long when it worked before". When I was building race engines one thing we often had to do was custom length push rods.

Brian

Jun 19, 2013 | 04:41 PM

Yahiko

Fleet Owner

Joined: Apr 2012

Posts: 27,307

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From: Spanaway

If someone had the time and tools it would be easy to check
the clearances and then take the spec for the lifters and cam
to get an answer. Instead of a guess. Granted it an educated guess
but still a guess.
The question boils down to how much head room do the lifters have
in there internal travel. With Ford's fix of .050" less rod I think
that is what they are thinking. It would be nice to know for sure.
That way if you do a valve job then you know that you have to
use the new shorter rods.
The more I see things like this the more I wished I had a engine
sitting around to play with.

Sean

Jun 19, 2013 | 05:26 PM

npccpartsman

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Joined: Dec 2003

Posts: 15,368

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From: Stuttgart, Ar

Quote:

Originally Posted by m-chan68

This is a very interesting question posted. Hopefully the quote from another tech, off another forum I frequent may shed some light onto the ones where roller lifters are failing. Here is the quoted text:

The portion of the quote highlighted in bold red should be considered very interesting information to ponder.

I think this is very interesting information to know and some I've been looking for. With as many sets of decked heads (even from Ford) as there are running around this may be Godsend for me and a lot of other folks.