TDC - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

trans665 · 05-14-2013, 06:11 PM

i know that the mark at 12 o clock is tdc...... but my son was missing with it when i was at work.. it was off the mark. now can i just put it back on tdc or not????? i know the crank rotates twice for every one rotation of the cam sprocket..

Chevy Fanatic · 05-14-2013, 07:21 PM

Quote:

Originally Posted by trans665

i know that the mark at 12 o clock is tdc...... but my son was missing with it when i was at work.. it was off the mark. now can i just put it back on tdc or not????? i know the crank rotates twice for every one rotation of the cam sprocket..

Need more information but if you have the rocker arms off you can rotate the crank without fear of the pistons making contact with the valves.

litle88 · 05-14-2013, 07:38 PM

Are your heads off?

litle88 · 05-14-2013, 07:45 PM

If not turn the crank over til the cam sprocket is at the 6 o'clock and the crank dot at 12 o'clock they will be aligned and your #1 cylinder will be at TDC.

trans665 · 05-14-2013, 09:55 PM

i took off the comp cam double roller off last night...and my son just moved the crank around...all the rockers are off..no contact going on..
i was just concerned about if the crank had to be on a certain rotation ...guess not... i already put a ls2 sprocket on with a new ls2 chain...im kinda puzzled about the chain tho... i replaced the tensanor with a dampener, and the side of the chain have movement or play... is that normal?? the double roller had no play on the sides.

thahemp · 05-14-2013, 10:07 PM

If you already finished doing your springs and everything, then I don't think you want to be cranking the engine around by hand anymore (with the chain installed anyways). I think you'll collapse your lifters if you crank the engine over with them installed. Then again... this doesn't seem like the "measure PTV clearance on each cylinder" type of install anyways.

Someone else weigh in on this. I only partially know what I'm talking about.

thahemp · 05-14-2013, 10:08 PM

Quote:

Originally Posted by trans665

i took off the comp cam double roller off last night...and my son just moved the crank around...all the rockers are off..no contact going on..
i was just concerned about if the crank had to be on a certain rotation ...guess not... i already put a ls2 sprocket on with a new ls2 chain...im kinda puzzled about the chain tho... i replaced the tensanor with a dampener, and the side of the chain have movement or play... is that normal?? the double roller had no play on the sides.

Alrighty... that answers that! Disregard my previous post.

litle88 · 05-14-2013, 10:21 PM

You'll be fine bud.

05-14-2013, 07:38 PM	#3
litle88 V8 Lounge member #2 Drives: 2001 Ws6 Join Date: Sep 2009 Location: Burbank,IL Posts: 6,373	Are your heads off? __________________ 2001 ws6, 40k miles, Ls3 416 stroker, short block built by PER the rest by me. LPE Ls3 heads milled to 12-1 comp, FAST 102, NW 102, kooks 2", dual DMH cutouts, Magnaflow C/B, BTR cam + springs. Full UMI suspension.

05-14-2013, 07:45 PM	#4
litle88 V8 Lounge member #2 Drives: 2001 Ws6 Join Date: Sep 2009 Location: Burbank,IL Posts: 6,373	If not turn the crank over til the cam sprocket is at the 6 o'clock and the crank dot at 12 o'clock they will be aligned and your #1 cylinder will be at TDC. __________________ 2001 ws6, 40k miles, Ls3 416 stroker, short block built by PER the rest by me. LPE Ls3 heads milled to 12-1 comp, FAST 102, NW 102, kooks 2", dual DMH cutouts, Magnaflow C/B, BTR cam + springs. Full UMI suspension.

05-14-2013, 10:07 PM	#6
thahemp Geek Drives: 2012 Black LS3 Join Date: Jan 2012 Location: Derby, KS Posts: 4,343 View My Garage	If you already finished doing your springs and everything, then I don't think you want to be cranking the engine around by hand anymore (with the chain installed anyways). I think you'll collapse your lifters if you crank the engine over with them installed. Then again... this doesn't seem like the "measure PTV clearance on each cylinder" type of install anyways. Someone else weigh in on this. I only partially know what I'm talking about. __________________ 01000111011011110110111101100100001000000110110001 11010101100011011010110010000001110111011010010111 01000110100000100000011101000110100001101001011100 110010000001101111011011100110010100100001 x = ac97968bd3df8f968c8cd3df998a9c94d3df9c8a918bd3df9c 909c94df8c8a9c949a8dd3df92908b979a8ddf998a9c949a8d d3df8b968b8cd1 x = ~x

05-14-2013, 10:21 PM	#8
litle88 V8 Lounge member #2 Drives: 2001 Ws6 Join Date: Sep 2009 Location: Burbank,IL Posts: 6,373	You'll be fine bud. __________________ 2001 ws6, 40k miles, Ls3 416 stroker, short block built by PER the rest by me. LPE Ls3 heads milled to 12-1 comp, FAST 102, NW 102, kooks 2", dual DMH cutouts, Magnaflow C/B, BTR cam + springs. Full UMI suspension.

05-14-2013, 06:11 PM	#1
trans665 Drives: 2013 2ss Join Date: May 2011 Location: corpus christi Posts: 488	TDC i know that the mark at 12 o clock is tdc...... but my son was missing with it when i was at work.. it was off the mark. now can i just put it back on tdc or not????? i know the crank rotates twice for every one rotation of the cam sprocket..

05-14-2013, 09:55 PM	#5
trans665 Drives: 2013 2ss Join Date: May 2011 Location: corpus christi Posts: 488	i took off the comp cam double roller off last night...and my son just moved the crank around...all the rockers are off..no contact going on.. i was just concerned about if the crank had to be on a certain rotation ...guess not... i already put a ls2 sprocket on with a new ls2 chain...im kinda puzzled about the chain tho... i replaced the tensanor with a dampener, and the side of the chain have movement or play... is that normal?? the double roller had no play on the sides.