Yella Terra and preload question
Thread Starter
On The Tree
Joined: Mar 2002
Posts: 136
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From: Shelbyville, KY
Yella Terra and preload question Everyone, I've got a set of TEA 5.3L Stage II heads (these are milled .010 or so), TR 224 cam and am using the 7.4" Comp p-rods. I'm following the install directions JmX has posted at http://www.ls1howto.com and have run into a bit of a snag on the lifter preload....
I'm using cylinder #2 as my 'reference' cylinder, as it's on the same side of the engine as I am when I'm turning it over, and it's very easy to watch while I rotate the crank pulley. I've got both valves closed and the piston for that cylinder is on the compression stroke. Now, I've got all the rockers removed and have the YT's installed on Cyl #2.
Not using the shims, I tighten the rocker bolts by hand until I can't tighten them anymore. I then check for 0-lash w/ the p-rods, and the p-rods are tight and will barely spin. Ok, so I get out the torque wrench, and start counting the .25 turns it takes to get me to 22lb-ft. I've done it 3 times (for consistency) and it takes barely over 1 .25 turn (90*) to get to 22 lb/ft.
I guess my question is this... is this too little preload? From what I understand less preload is better than more, but I don't want to compromise my lifters/other motor parts by not having enough preload....
Should I have more than 1 .25 turn?
Is anyone else running this setup? if so, did you use the shims?
Thanks!!
I'm using cylinder #2 as my 'reference' cylinder, as it's on the same side of the engine as I am when I'm turning it over, and it's very easy to watch while I rotate the crank pulley. I've got both valves closed and the piston for that cylinder is on the compression stroke. Now, I've got all the rockers removed and have the YT's installed on Cyl #2.
Not using the shims, I tighten the rocker bolts by hand until I can't tighten them anymore. I then check for 0-lash w/ the p-rods, and the p-rods are tight and will barely spin. Ok, so I get out the torque wrench, and start counting the .25 turns it takes to get me to 22lb-ft. I've done it 3 times (for consistency) and it takes barely over 1 .25 turn (90*) to get to 22 lb/ft.
I guess my question is this... is this too little preload? From what I understand less preload is better than more, but I don't want to compromise my lifters/other motor parts by not having enough preload....
Should I have more than 1 .25 turn?
Is anyone else running this setup? if so, did you use the shims?
Thanks!!
