Rocker Bolts?
05-07-2007, 02:50 PM
#1
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Rocker Bolts? so... I took my valve cover off and i took the rockers off because i thought my push rods were makin a noise so i popped off the rockers and checked them all... no bends so I put it all back totether... torqued the bolts to 22 ft lbs and put it all back together... started it up and it started knockin... a few of the rockers had come loose... so i took em off re-torqued it down and did it again... again a few more rockers came loose... so i started the car with the valve cover off and watched it... ahgai na few more came loose so i torqued them down and craked it over again and eventually they all got tight...but what made these bolts back off? valve position? it seems ok now what should i do?
05-07-2007, 02:55 PM
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Try Locktite! I would try cleaning the threads in the threads/holes and use a little blue locktite.
BTW, I had one come loose and I thought it was a rod brering it was so loud.
Bob K.
BTW, I had one come loose and I thought it was a rod brering it was so loud.
Bob K.
05-07-2007, 03:03 PM
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i mean i torqued the ones that were givin me a problem to 30ft lbs lol and they are holding i just dont want them to back out... so red or blue locktite and how much of it?
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05-07-2007, 05:43 PM
#9
Loctite won't hold unless you, a) clean the bolt, b) clean the bolt hole. Otherwise its a waste of time. Overtightening is a recipe for disaster. Remove all rockers, clean all the bolts and the bolt holes (keep them in the correct position when off the car). Rotate the motor to TDC on #1 and then follow the GM procedure tightening to 22 lb-ft the correct rockers, rotate the crank 1 turn and then do the rest. Use Loctite 242 (medium strength).
05-07-2007, 05:55 PM
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Originally Posted by vettenuts
Loctite won't hold unless you, a) clean the bolt, b) clean the bolt hole. Otherwise its a waste of time. Overtightening is a recipe for disaster. Remove all rockers, clean all the bolts and the bolt holes (keep them in the correct position when off the car). Rotate the motor to TDC on #1 and then follow the GM procedure tightening to 22 lb-ft the correct rockers, rotate the crank 1 turn and then do the rest. Use Loctite 242 (medium strength).
05-07-2007, 08:28 PM
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why would they back out in the first place i wonder... they've been removed like 4 or 5 times. i dont know if that has anything to do with it?
05-07-2007, 09:19 PM
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actually now that i think about it.... if i torque down the rocker bolts to 22 ft lbs and start the car of course some will be loose because i torques some down at the highest expansion point for the springs and then when the springs compress the rocker just kinda flails around....and unseats and becomes loose... so if i torque them then crank the car via key and crank them again and then repeat untill i can let it run without any tapping that should work right?
05-08-2007, 07:59 AM
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Originally Posted by WS6WRX
or you could just put a socket on the crank and turn until the rockers are in the right position, ensuring that each one if torqued correctly.
I did it this way following the firing order (see the cam install guide at LS1howto.com). I put the #1 cylinder at top dead center and torqued down the 4 rockers on 1 & 6, rotate 90, then do 8 & 5, rotate 90, then do 7 & 4, rotate 90, and finish up with 3 & 2. Rotate the motor over by hand a couple times and then double check the torque using the same process. Some will say this isn't necessary. But, it helps me with piece of mind. 
