Why do I keep trashing the same rocker arm?
04-09-2011, 06:07 PM
#13
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What am i looking at with the head off? A bad lifter? Is it possible that a bad lifter is causing the bearings to come out of the same rocker twice?
04-09-2011, 07:52 PM
#14
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Thanks been the best advice soo far... The threads check out good and the bolt looks like its good( no galling or layed over threads). The rocker rail may be my culprit from the first rocker that it trashed. The number three rocker pedestal looks good but it has been milled on both sides soo that means it got extremely hot and could have possibly warped it from the first time so that would explain the second time. I will check PR length and preload in the morning. How do you go about checking to see if a lifter is bad? Thanks again PT.net you are the reason I keep on keeping on......
04-09-2011, 08:30 PM
#15
Bud i understand your frustration!
Hang in there.
After you re- loc tite the rocker bolt. let it sit for an hour , just so it has more than enough time to set up.
I had the same problem as you, my rocker arm kept going loose on my old 5.3 after i cammed it.
Happened 3 times, i even tried putting a helicoil in the rocker bolt hole but i ended up fuking that head up and had to buy a new one from the junkyard.
Luckily replacement 5.3 heads are bout 100$ fully assembled, so if you do have a messed up head a replacement isnt too bad.
I bet you'll be fine though if ya take your time , clean up the threads and re loctite.
good luck.
Hang in there.
After you re- loc tite the rocker bolt. let it sit for an hour , just so it has more than enough time to set up.
I had the same problem as you, my rocker arm kept going loose on my old 5.3 after i cammed it.
Happened 3 times, i even tried putting a helicoil in the rocker bolt hole but i ended up fuking that head up and had to buy a new one from the junkyard.
Luckily replacement 5.3 heads are bout 100$ fully assembled, so if you do have a messed up head a replacement isnt too bad.
I bet you'll be fine though if ya take your time , clean up the threads and re loctite.
good luck.
04-09-2011, 08:44 PM
#16
I would suggest to remove all of the rockers and switch them to the other side of the engine and vice versa. Keep the pushrods to the same rocker. If the problem follows you know it is a rocker/pushrod. If the problem stays on the #6 intake again, then it is something with that cylinder. If it stays to that cylinder it could be the lifter, valve, valve spring, maybe even hitting on the valve cover. I would check your valve spring, there have been several people that have broken one and it never made a sound. What cam and rockers are you running?
04-09-2011, 08:44 PM
#17
Bud i understand your frustration!
Hang in there.
After you re- loc tite the rocker bolt. let it sit for an hour , just so it has more than enough time to set up.
I had the same problem as you, my rocker arm kept going loose on my old 5.3 after i cammed it.
Happened 3 times, i even tried putting a helicoil in the rocker bolt hole but i ended up fuking that head up and had to buy a new one from the junkyard.
Luckily replacement 5.3 heads are bout 100$ fully assembled, so if you do have a messed up head a replacement isnt too bad.
I bet you'll be fine though if ya take your time , clean up the threads and re loctite.
good luck.
Hang in there.
After you re- loc tite the rocker bolt. let it sit for an hour , just so it has more than enough time to set up.
I had the same problem as you, my rocker arm kept going loose on my old 5.3 after i cammed it.
Happened 3 times, i even tried putting a helicoil in the rocker bolt hole but i ended up fuking that head up and had to buy a new one from the junkyard.
Luckily replacement 5.3 heads are bout 100$ fully assembled, so if you do have a messed up head a replacement isnt too bad.
I bet you'll be fine though if ya take your time , clean up the threads and re loctite.
good luck.
This may be stating the obvious but Id start with a new rail, its chewed up a little and doesnt take much at all to throw the rocker geometry up. It also doesnt take much to chunk the needle bearings in the shitty design. You could always order up the comp trunion upgrade that gets rid of the needle bearings.
04-09-2011, 08:48 PM
#18
You torque them to 22n-m not ft/lbs. You probably stripped the threads in the head. Not good.
04-09-2011, 08:54 PM
#20
Hes has an LY5 5.3 so it has the 243/799 heads on it so not quite so cheap to replace unfortunately.
This may be stating the obvious but Id start with a new rail, its chewed up a little and doesnt take much at all to throw the rocker geometry up. It also doesnt take much to chunk the needle bearings in the shitty design. You could always order up the comp trunion upgrade that gets rid of the needle bearings.
This may be stating the obvious but Id start with a new rail, its chewed up a little and doesnt take much at all to throw the rocker geometry up. It also doesnt take much to chunk the needle bearings in the shitty design. You could always order up the comp trunion upgrade that gets rid of the needle bearings.
Just feel bad for the OP and hope we can get him fixed up.
