probable fault for pedastal rocker issue

Topic: probable fault for pedastal rocker issue (Read 1904 times) previous topic - next topic

probable fault for pedastal rocker issue

July 16, 2013, 11:51:04 PM

found driver head that all seated valves, the rockers jingled litterally you could wobble them around.

on the pass side, the seated valve rockers enabled me to rotate the push rod like normal but no adverse play was shown.

i rotated the crank and the the wobbly rocker arm issues stayed on the driver head while all the passanger side head rocker arms were all snug and push rods all spun normally on seated valves.

what is the most likely probable fault here?

probable fault for pedastal rocker issue

Reply #1 – July 17, 2013, 06:17:46 AM

Jay you need to be more specific or post some video or photos. Please explain better you situation. Thanks

I am thinking you mean the lifters are not pumped up but just a GUESS. Please add more details

probable fault for pedastal rocker issue

Reply #2 – July 17, 2013, 07:51:41 AM

Sounds like the motor had no oil in it for a while and when they rolled it over to take the torque converter nuts off it collapsed the lifters and purged the rest of the oil out of the lifters.

Just an idea.

probable fault for pedastal rocker issue

Reply #3 – July 17, 2013, 09:37:52 AM

guys,
the pics are not available, the motor came apart so quickly there was not time.

basically what i said was the case, rockers were wobbly on the driver side head for only the valves that were seated.
i rotated the crank and the issues transfered to all the other remaining rockers on the drivers side head.

the issue was not present on the passanger side head.

engine did sit for a year or so.

machine shop assumed the lifters just were no longer pumped up as well but i have to ask, what are the odds the issue is only present on the driver head?

probable fault for pedastal rocker issue

Reply #4 – July 17, 2013, 10:36:00 AM

Is this a roller cam or flat tappet?

probable fault for pedastal rocker issue

Reply #5 – July 17, 2013, 11:28:23 AM

motor out of a 97 explorer, roller

probable fault for pedastal rocker issue

Reply #6 – July 17, 2013, 03:28:06 PM

Have you started it yet? Have you really checked the rockers when you adjusted them, Pretty stock motor right?, If so set at 15lb. run and then redo them. I know you got to pull the upper again thats what it is.

probable fault for pedastal rocker issue

Reply #7 – July 17, 2013, 04:31:10 PM

The rocker issue is more than likely a lifter issue. I would just run all new lifters. That should fix the problem.

probable fault for pedastal rocker issue

Reply #8 – July 17, 2013, 11:00:24 PM

SIMPLE the lifters are bled down. That is normal as the engine has to run to pump the lifters UP!!! The engine is being rebuilt so any issues should be addressed by the engine builder!!

probable fault for pedastal rocker issue

Reply #9 – July 18, 2013, 09:46:29 AM

this issue was found during the tear down.
i could not understand "why" this was only happening on the driver head, i concluded lifters bled down as well but what are the odds that all 8 on one side bled down and the other 8 did not.

machine shop and i just shrug it off as lifters bled down as well but thought i would ask,, i was actually thinking more a long the lines of a clogged oil galley on the drivers side block.

probable fault for pedastal rocker issue

Reply #10 – July 18, 2013, 12:25:15 PM

There are so many variables with these things, especially with mass produced engines. Custom, quality builds would have much more consistency across the motor. This would be easy to check by spinning the oil pump with the motor together and seeing how the oil flows out either side. I'd guess it's fine. I would also replace the lifters while it's apart. Bearings, rings, seals, and lifters at the bare minimum on a rebuild, if the bores in the cylinders and lifter holes are good.

probable fault for pedastal rocker issue

Reply #11 – July 18, 2013, 01:41:49 PM

Quote from: Seek;418846

There are so many variables with these things, especially with mass produced engines. Custom, quality builds would have much more consistency across the motor. This would be easy to check by spinning the oil pump with the motor together and seeing how the oil flows out either side. I'd guess it's fine. I would also replace the lifters while it's apart. Bearings, rings, seals, and lifters at the bare minimum on a rebuild, if the bores in the cylinders and lifter holes are good.

+1

If you're rebuilding it don't worry. You'll find any issue besides the lifters (if there is one).

probable fault for pedastal rocker issue

Reply #12 – July 18, 2013, 08:19:28 PM

ok,,
well, confirmed valve guides are all perfect.
Springs are not giving enough seat presure, even though even over at SBF tech and other sites stating the GT heads dont mandate valve spring replacement.

moving forward with a big order tomorrow.

to date i have 590.00 in this and have not purchased the first engine component.

probable fault for pedastal rocker issue

Reply #13 – July 18, 2013, 09:07:11 PM

the explorer valve springs are marginal with the factory cam, HO cam is to much for them. Some people get lucky, some people get valve float barely over cruise RPM...

probable fault for pedastal rocker issue

Reply #14 – July 18, 2013, 10:11:32 PM

Bottom line here the block needs to be punched out anyway so that means a complete cleaning will be necessary. I personally never reuse valve springs no matter what. They are cheap and ford springs are notorious for getting week. (note valve springs have a normal life span of app 40 thousand miles on a performance engine) As far as the lifters go i always replace them. They now at this point are out of the engine and can be inspected and or take them apart to investigate the reason for them to be collapsed. Either way the builder will check them for PRELOAD and he will also have to check PUSH ROD LENGTH. I always change lifters on a build. And i am certain he will also recommend new ones as well. So carry on!!