Install in Progress Help Spin Crank to TDC for pushrod??????
#1
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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???
#4
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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
#5
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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
#6
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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#11
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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
#12
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.
#13
LSxGuy widda 9sec Mustang
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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.
#15
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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".
#20
LSxGuy widda 9sec Mustang
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Throw that last bolt as far as you can into a vacant field also.