Might have a Broken rocker - Ford Powerstroke Diesel Forum
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post #1 of 16 Old 06-23-2013, 09:23 PM Thread Starter
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Might have a Broken rocker

I'm taking a guess on having a broken rocker, what's your guys thoughts? 08 F250 6.4l. It's got a dpf and egr delete, sct tuned with IDP custom tune. I noticed a sounds coming what seemed to be threw the intake, a popping sound, also I can hear some tapping/rattle on the passenger side valve cover area. Runs fine otherwise, buddy thought it ran to well to be broken. It's got 136k miles. But It seems to have a lot of blow by for the truck running this well. I just bought this truck at an auction, got a crazy good deal on it. So I wasn't there when this sound started. I'm leaving town for a week and won't be able to work on it, but when I get back depending on what I find out ill tear the valve cover off and look at it.
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post #2 of 16 Old 06-25-2013, 05:47 AM
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The 08 6.4's have a real bad reputation for wearing the ends of the rocker arms out. The rockesr also develop cracks at the pivot point which is why we use brand new rocker assemblies when we re-manufacture those engines. If it looks like it can be repaired, Ford sells a complete assembly that's easy to install.
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post #3 of 16 Old 06-26-2013, 09:47 AM
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Originally Posted by ColtonH00 View Post
I'm taking a guess on having a broken rocker, what's your guys thoughts? 08 F250 6.4l. It's got a dpf and egr delete, sct tuned with IDP custom tune. I noticed a sounds coming what seemed to be threw the intake, a popping sound, also I can hear some tapping/rattle on the passenger side valve cover area. Runs fine otherwise, buddy thought it ran to well to be broken. It's got 136k miles. But It seems to have a lot of blow by for the truck running this well. I just bought this truck at an auction, got a crazy good deal on it. So I wasn't there when this sound started. I'm leaving town for a week and won't be able to work on it, but when I get back depending on what I find out ill tear the valve cover off and look at it.
I had a similar problem with a truck just like yours, except this one had a low knock when cold and once it reached a normal temperature it would go away. sometimes it would loose some power for a few seconds. took the valve covers off and we found two cracked rocker arms one on cylinder #5 and one on #8 replaced all rocker arms and problem solved. The truck had 145,000 miles on it the owner said he had never had any problems with it.
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post #4 of 16 Old 06-26-2013, 03:18 PM Thread Starter
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Yeah I'll be home tomorrow and ill see what's up with it. But when I asked ford how much it would cost for that assembly, they said it's for 08-10 trucks, so do you think that it's the updated assembly that you can buy now
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post #5 of 16 Old 06-27-2013, 06:30 AM
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Just replace all the rockers on that side while your at it. The assembly for all the rockers is like $150.

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post #6 of 16 Old 06-27-2013, 06:52 AM
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On the same topic, I've seen videos of some guy that repairs 6.4s running the engine with the valve covers off. It seems that too many parts must be removed to run them this way. The reason is to inspect the valve train and injector connections for leaks. Has anyone done this? Last time I did this, there was oil spray on everything in my chevy. Is it the same for the 6.4, the oil mist?
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post #7 of 16 Old 06-30-2013, 06:47 PM Thread Starter
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On passenger side valve cover can be off and still ran for sure. It doesn't spray oil everywhere.
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post #8 of 16 Old 08-07-2013, 09:38 AM Thread Starter
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Hey guys so I found the problem. Tore apart my truck pulled apart rockers, and found a busted and bent push rod. Cylinder #8 exhuast valve. So that makes everything make sence. It'll be up and running again this Friday!
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post #9 of 16 Old 08-07-2013, 11:15 AM
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Nice bro. How hard was it? Pictures?
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post #10 of 16 Old 08-07-2013, 11:25 AM
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pushrods don't typically "bust and bend" without some other issue
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6.4 , problem , rocker arms , sound , ticking

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