Originally Posted by GPSK61

What's strange is this sound varies in its tone and volume. sometimes almost unnoticeable and at others very loud particularly in regen mode. Makes me think its an emission system problem and at times I would liken it to a manifold leak. I have to wonder if I had excessive blowby as was suggested by diesel shop wouldn't those high boost pressures blow out crank seals? There's not a drop of oil on my driveway.

Originally Posted by senix

Well a good story any way. Hard to say but emissions is not your friend. We all know that.

Originally Posted by Tom

If your blow-by was excessive you would suffer low compression in one or more cylinders, and you would likely feel it when under throttle. The crankcase breather system should prevent seals from failing as a result of blow-by, but stranger things have happened.

Originally Posted by GPSK61

Although this annoying sound that seems to be at its worst between 5 and 15 psi continues to concern me. What's strange is this sound varies in its tone and volume. sometimes almost unnoticeable and at others very loud particularly in regen mode. Makes me think its an emission system problem and at times I would liken it to a manifold leak.

Originally Posted by GPSK61

have to wonder if I had excessive blowby as was suggested by diesel shop wouldn't those high boost pressures blow out crank seals?

Originally Posted by SANDDEMON08

Well the title says it all. I have to say i am very surprised with this happening to me at 113,000 miles. My truck has been DPF and EGR deleted since the truck had 10,000 miles on it. I have changed the oil every 3,500 to 5,000 miles. I have always used synthetic rotella oil 5w-40. I have had a oil bypass filter on the truck since 60,000 miles, oil samples have all been good. Iron was always high but blackstone always accredited it to the high levels of towing i did. Now the truck has been tuned since 10,000 miles and i tow a lot but i have never abused the truck maintenance has always been top notch.

I havent tore into it yet but i have seen and worked on enough 6.4 trucks with the symptoms to know it has the issue. You can hear the valve train noise very slightly and the intake is just starting to make a echo which is about the best i can describe it. Our fleet trucks have all had this issue from 110,000 to 130,000 miles, but most are completely stock with all emission equipment, 15w40 delo 400 oil that is changed every 5,000 miles or less. On the first truck we had an issue ford advised us to not mess with it tell we had an bigger issue or cylinder skip. So on there advice we did, when the issue became a dead skip we took it in only to find out we had waited to long and the valve guides where damaged turning a 1,500.00 repair into a 4,500 dollar repair. Since that horrible experience we have replaced the rockers at first notice and have had no issue. The rockers on my truck not completely gone but i don't want to wait for it to break before i fix them, so I figure ill catch it before it gets really bad and cause damage to other components. I plan to upgrade all the push rods as well while I have it apart.

With that being said i think its poor design leading to the failure. From what i see on the forums and read most trucks over 100,000 miles that work hard have the issues, trucks that are simply commuters don't seem to have the problem as early. I always thought the issue was more or less driven by the oil being diluted from active regens or poor maintenance.

Now what can be done to improve this issue. I have read several people have replaced there 6.4 rockers with rockers from a 6.0 and have had good luck but obviously its hard to get good feed back because people simply haven't put on the extra 100,000 miles to see if it is actually improved. My thoughts where if the engine went 113,000 on the stock set another 113,000 miles would be close to life of the motor or either way not something you have to change often.

I have also seen that harland sharp makes a billet set for the 6.0. If the 6.0 rockers are interchangeable these may be a good upgrade(Maybe a tech could chime in and verify they truly are interchangeable), but the price is crazy you could pay to have the factory rockers change twice for just what the Harlands cost.

Harland Sharp Roller Rocker Arms PowerStroke 6.0L 2003-07

There are other post on this issue I'm just looking to see if there are any better parts or updates on this issue. I plan to take some photos when i change them and do a little write up as usual.

Originally Posted by SANDDEMON08

So heres my parts list i just got ordered i have attached part numbers for someone that may have this issue and is looking for more information. I"ll take photos and probably follow up with a little write up.

2 rocker assemblies contains all the rockers for one side @ 165.00 each ford part 8C3Z6564-D sold per each
8 Injector seal kits @ 14.56 each to replace the injector lines ford part 8C3Z9229-A sold per each
1 complete set of chromoly upgraded push rods @ 249.00 from river city diesel http://www.rivercitydiesel.com/index...mart&Itemid=54
16 new valve bridge plates 4.80 each to cheap to not replace ford part 8C3Z-6564-A

total cost of parts above 771.80 you could save the 249.00 on the push rods if there not damaged and the basic cost only be 522.80 but i want a little extra insurance while i am in there

Plus i am going to replace the upper fan shroud the butcher dealer destroyed the last time they had the truck for repairs.

1 fan upper radiator shroud ford part 7C3Z-8146-F for 113.18

so there went 884.96 just in parts should be here by wensday or thursday if everything goes well i should have it done the following weekend unless work stops me. Might go cab up and do the upgraded up-pipes,HP turbo and 60 HP over 8 hole injector nozzles while I'm at it since i have already have those parts as well.