Install in Progress Help Spin Crank to TDC for pushrod??????
Thread Starter
Staging Lane
Joined: Mar 2008
Posts: 89
Likes: 0
From: Michigan
Install in Progress Help Spin Crank to TDC for pushrod?????? 
I am changing the pushrods on my LS1 sure enough one was bent all to hell.... Do I have to spin the crank to get to TDC before tightening down the rockers??? 
Look at post number 10.
https://ls1tech.com/forums/showthrea...ocker+sequence
It will give you the sequence. That is the way I did mine and have not had any problems.
R/
Frat
https://ls1tech.com/forums/showthrea...ocker+sequence
It will give you the sequence. That is the way I did mine and have not had any problems.
R/
Frat
Thread Starter
Staging Lane
Joined: Mar 2008
Posts: 89
Likes: 0
From: Michigan
Look at post number 10.
https://ls1tech.com/forums/showthrea...ocker+sequence
It will give you the sequence. That is the way I did mine and have not had any problems.
R/
Frat
https://ls1tech.com/forums/showthrea...ocker+sequence
It will give you the sequence. That is the way I did mine and have not had any problems.
R/
Frat
that post doesnt make sense. If the friction from the lifter affected preload on the rocker/pushrod, every cylinder would require a different amount of tq applied to it to defeat this friction. So if this was true, when cylinder 1 was TDC (lifter is off the ramp) cylinder 2-8 would all be at different valve events anyway. TQ'ing them all down to 22lbs and then spinning the engine and re checking ensures that they are all TQ'd correctly
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Thats how i do it too. 
that post doesnt make sense. If the friction from the lifter affected preload on the rocker/pushrod, every cylinder would require a different amount of tq applied to it to defeat this friction. So if this was true, when cylinder 1 was TDC (lifter is off the ramp) cylinder 2-8 would all be at different valve events anyway. TQ'ing them all down to 22lbs and then spinning the engine and re checking ensures that they are all TQ'd correctly
we could argue this for days, but there is more than one way to skin this cat. If for what ever reason you dont have the timing cover off, and dont know how to tell when 1 is at TDC, like the OP, he will be fine just tq them down and spinning it. Obviously we all have different levels of being **** about our cars. Kind of like degreeing the cam when you install it. 80% wont do it because they dont know how or just dont care.
Joined: Nov 2001
Posts: 3,043
Likes: 0
From: Texas and Qatar
I do them all at the same time normally, but I torque to 26lb ft. and retorque twice. On internally modded LS1's 22lb ft. just doesn't seem like enough and I had a few rockers loosen rather quickly when I used that torque specification, even with rotating the engine and torquing. Never had any problems at 26lb ft.
What I do for TDC is watch the #1 intake valve close by putting the pushrod in that location and watching it go down and stop. Once closed you know it is roughly 1/2 turn to the top so go 1/4 turn then use a straw or flashlight to track piston movement to top.
The BEST way to do it is like checking lash on a solid roller. Check the intake as the exhaust is opening, then check the exhaust as the intake is closing. This guarantees that the lobes are on the base circle.
Just FYI, be careful about looking for TDC because you can be on TDC and both valves can be open, ie "overlap".
Just FYI, be careful about looking for TDC because you can be on TDC and both valves can be open, ie "overlap".
Joined: Nov 2001
Posts: 3,043
Likes: 0
From: Texas and Qatar
Throw that last bolt as far as you can into a vacant field also.
