Well, I finally managed to get around to swapping out the lifter that seemed to be bad last weekend. Due to the fact that the lifters are hydraulic rollers and must come out in pairs, this is a fair amount of work what with R&Ring the rocker system and intake.
I put about 40 miles on the truck over the course of a couple evenings this week and all seemed great! The 445 is running great and everything seemed just tickety-boo... until I pulled in on Thursday evening after a nice drive and I started pulling the air cleaner so I could make an idle adjustment. The truck was idling and all of a sudden I heard a distinct "click" and then it started ticking again... exact same sound as last time when I found one pushrod way out of adjustment - which led me to believe the lifter had compressed. Damn!
Although I didn't take pictures, the valve train geometry all looked fine and I adjusted all the rockers and all clearances seemed to be fine. I've got good oil pressure (35-40psi @ idle when hot), so everything should be getting the necessary lubrication. I seriously don't have 60 miles on the engine in the truck... but it was broken in on a dyno and should be ready to "drive it like I stole it". I put Mobil 1 15W50 oil in the engine when I changed out the breakin oil. I'm running COMP Cams Pro Magnum Hydraulic Roller Lifters.
Help! I'm starting to get discouraged and would appreciate any advice on what to look for. If I need to provide any more details, just let me know.
The rocker adjusters are all brand new... I'm not saying there is nothing wrong with them, but everything was brand new for this build. When I took it apart last weekend, all the lock nuts were tight. My rockers have balls and thus my pushrods have cups.
Well, if something wasn't broken before, it sure as heck is now... I decided to move the truck over in the garage before tearing into it again and that may have been a mistake. I was being gentle with it, but it sounded like it threw a pushrod... which may have led to this:
The parts were super hot, so I haven't taken the rocker shafts apart yet... needless to say I'm going to need some new pieces at the very least! Maybe this PRW stuff isn't the best after all...
the thickness of the material looks suspect surely? if you think about how the initial force of the push-rod is acting on that rocker, the place where it has failed is under a tremendous tensile load, just as the top piece, which is substatially thicker, is under a compressive force. to be so thin, and subject to such tensile forces, it doesn't surprise me to see a failure like that. compared a stock iron rocker, that design looks weak to me. they should warranty a failure like that. unless you have mega strong springs and a radical cam, that should not have happened IMO.
I talked to my machinist (Rob at Blue Oval) and he is suggesting (due to observed component failure) that even with roller cam that ZDDP should be used in any performance oriented build. Just when we thought it was safe to go back in the water. Mike
Would you guys reuse the shafts, stands, and spacers?
July 8 2012, 10:34 PM
Here is another shot of my broken rocker:
And one (as best I could get it) of the rocker shaft - I don't think it's in too bad of condition:
And here is a shot of the complete assembly unassembled:
So here are my questions for the experts amongst us...
- the shaft diameter is .84" according to my digital caliper. Harland Sharp's bronze bushed rockershttp://www.harlandsharp.com/fe_ford.htm) should fit these shafts. Does anyone know the width of the HS rocker bodies? These PRW units are 1" wide. If the HS rockers fit, would I be alright just getting a set of the rockers and reusing the PRW shafts, stands, and spacers?
- I don't think I really need to move up to the HS needle bearing unitshttp://www.harlandsharp.com/ford_nb.htm), do I? I'm running a Comp Cams custom grind hydraulic roller camshaft (dur. @.050 233/244, lift .577/.579, LSA 112) with stock Edelbrock Performer RPM cylinder heads - including the stock springs.
- how would a set of the T&Ds compare to the HS rockers on the rest of the PRW gear?
Yes, I had the HS bushed arms on my .780" TP chipped at 7,600. I have....................
July 9 2012, 6:42 AM
...............the HS needle-bearing arms in a box. I would replace the arms with the HS, T&D are for the big boys with big wallets. It's cheaper to mill down the spacers to fit the HS (if needed) in my opinion, Rod. BTW, a good set of OE Ford adjustable arms with tight adjusters will handle 7,000rpm all day long, JMO.