Breaking Rocker arms
Thread Starter
Racer
Joined: May 2003
Posts: 306
Likes: 1
From: Austin TX
Breaking Rocker arms
Alright when one of my rocker arms broke on the drivers side about a year ago i thought it was a fluke. Now that I broke another one today I am realizing something is wrong. So after pulling the broken one I pulled one of the good ones out and realized that there might be too much play up and down in it. I think the bearings are just going out on all of them.
My car has MTI stage 2E LS1 heads, X1 cam (230/228 591/570 112), 7.4 inch hardened pushrods, and stock rockers.
The car is a 99 with about 88000 on it.
Should I be looking into shorter pushrods? Are rockers just a wear item that I didnt know about? Whats the deal
Thanks in advance
BTW, are LS1 rockers the same as LS6?
My car has MTI stage 2E LS1 heads, X1 cam (230/228 591/570 112), 7.4 inch hardened pushrods, and stock rockers.
The car is a 99 with about 88000 on it.
Should I be looking into shorter pushrods? Are rockers just a wear item that I didnt know about? Whats the deal
Thanks in advance
BTW, are LS1 rockers the same as LS6?
Safety Car
Joined: Sep 2003
Posts: 3,558
Likes: 2
From: Cape Coral FL
There have been a reports of cammed cars having the rockers spit the bearings out due to the retainer clip breaking. Harland Sharp does a rebuild and replaces the Trunion bearings and installs new heavy duty clips that don't break. I think it's around $300 for the rebuild and it takes about a week.
BTW, if you spit the bearings make sure you account for all of them.
BTW, if you spit the bearings make sure you account for all of them.
Safety Car
Joined: Sep 2003
Posts: 3,558
Likes: 2
From: Cape Coral FL
Originally Posted by NavyBlue99
yeah it spit half of the bearings, but i have no idea where they went
3rd Gear
Joined: Dec 2005
Posts: 3
Likes: 0
Pull your pushrods and make sure they are all equal length. Helped a friend install a cam in his LS6 the other day, one of the hardened pushrods was clearly shorter than the others, and it was marked 7.400 the same as the rest.
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Instructor
Joined: Aug 2004
Posts: 100
Likes: 0
I have had good luck doing the stick magnet.In yr case if you were not running it hard,i bet yo ucan find them.On other vette engine in my 57 bel-air,before i got smart & went to hydrolic cam;i retrieved part of my broken push rod thru the hole in the head unstead of pulling it down.I smile every time i see that pole magnet in my tool box.Funny thing i bought the mag.in one of those grab boxes in a parts store for 1.99.Getting back to yr problem.I whud change the oil & see how many you could account for.Theyre going to bottom of the pan esp.if youre operating the engine slow.Thats my take on the situation.Also after you change oil put in one of those mag plugs & run & chg it again...Good luck.....
Thread Starter
Racer
Joined: May 2003
Posts: 306
Likes: 1
From: Austin TX
Originally Posted by 2004SpiralGrey
when it broke what kind of sound did you hear coming from yout valve train...i think this might have happened to me tonight
)
Thread Starter
Racer
Joined: May 2003
Posts: 306
Likes: 1
From: Austin TX
Originally Posted by C5A4TT
I dont think you should be running 7.4" pushrods with that big of cam..did someone check that??
Safety Car
Joined: Sep 2003
Posts: 3,558
Likes: 2
From: Cape Coral FL
Originally Posted by vettenuts
Pushrod length is dependent on lifter preload and cam base circle, not lift.
One question though. Do you have 25k miles on your springs? And what kind are they? It may be time for a spring change.
Thread Starter
Racer
Joined: May 2003
Posts: 306
Likes: 1
From: Austin TX
Originally Posted by ArKay99
One question though. Do you have 25k miles on your springs? And what kind are they? It may be time for a spring change.
Safety Car
Joined: Sep 2003
Posts: 3,558
Likes: 2
From: Cape Coral FL
Originally Posted by NavyBlue99
yeah its time for a change in springs, it is on the list to do. I dont see how this would be the problem though since the springs themselves seem ok