question about rockers
10-11-2012, 07:13 PM
#1
question about rockers Ill be assembling my shortblock up this monday installing heads and valve train and just wanted to know how do you figure out if cylinder 1 is on the compression stroke so i knkw what valves to tighten at that specific time so i know if im on Cam BC. I was going to initially just turn the crank over while my heads are off and install them with while #1 was on TDC and mark the harmonic Balancer with a marker at the 12'o clock position. Also two other unrelated questions. Should i use copper spray on my MLS gaskets? and should RTV be used on the rocker bolts?
10-12-2012, 10:35 AM
#2
Ron,
I believe you may have meant 'Loctite' on the rocker bolts.
Also, from "Joseph"...an engine builder & tech guru, here on LS1Tech...
I'm glad you found my info helpful, not many people know the valve events for all 8 cylinders and when they happen. You would naturally assume with the dots aligned it would be the firing position of cylinder #1, when its actually the start of the intake stroke as far as the piston/intake valve is concerned. With the dots aligned cylinder #6 is the one to set preload/lash/ or for installing rockers.
Each 90* (720* / 8cyl = 90*) on the crankshaft gear is another cylinder firing, while each 45* (360* / 8cyl = 45*) on the camshaft gear is another cylinder firing. Having the timing cover off helps to watch the sequence.
Here's a copy/paste of a manuscript I'm working on that may help also:
Quote:
Originally Posted by Joseph
LSX Firing Order 1, 8, 7, 2, 6, 5, 4, 3
TDC Cyl. #1) Camshaft dot at 12:00 / Crankshaft dot at 12:00
TDC Cyl. #8) Camshaft dot at 1:30 / Crankshaft dot at 3:00
TDC Cyl. #7) Camshaft dot at 3:00 / Crankshaft dot at 6:00
TDC Cyl. #2) Camshaft dot at 4:30 / Crankshaft dot at 9:00
TDC Cyl. #6) Camshaft dot at 6:00 / Crankshaft dot at 12:00
TDC Cyl. #5) Camshaft dot at 7:30 / Crankshaft dot at 3:00
TDC Cyl. #4) Camshaft dot at 9:00 / Crankshaft dot at 6:00
TDC Cyl. #3) Camshaft dot at 10:30 / Crankshaft dot at 9:00
If you have that and the timing cover off you don't even half to measure how far you turned the engine over, just line up the dots to the correct orientation and install.
Thanks,
Joseph
I believe you may have meant 'Loctite' on the rocker bolts.
Also, from "Joseph"...an engine builder & tech guru, here on LS1Tech...
I'm glad you found my info helpful, not many people know the valve events for all 8 cylinders and when they happen. You would naturally assume with the dots aligned it would be the firing position of cylinder #1, when its actually the start of the intake stroke as far as the piston/intake valve is concerned. With the dots aligned cylinder #6 is the one to set preload/lash/ or for installing rockers.
Each 90* (720* / 8cyl = 90*) on the crankshaft gear is another cylinder firing, while each 45* (360* / 8cyl = 45*) on the camshaft gear is another cylinder firing. Having the timing cover off helps to watch the sequence.
Here's a copy/paste of a manuscript I'm working on that may help also:
Quote:
Originally Posted by Joseph
LSX Firing Order 1, 8, 7, 2, 6, 5, 4, 3
TDC Cyl. #1) Camshaft dot at 12:00 / Crankshaft dot at 12:00
TDC Cyl. #8) Camshaft dot at 1:30 / Crankshaft dot at 3:00
TDC Cyl. #7) Camshaft dot at 3:00 / Crankshaft dot at 6:00
TDC Cyl. #2) Camshaft dot at 4:30 / Crankshaft dot at 9:00
TDC Cyl. #6) Camshaft dot at 6:00 / Crankshaft dot at 12:00
TDC Cyl. #5) Camshaft dot at 7:30 / Crankshaft dot at 3:00
TDC Cyl. #4) Camshaft dot at 9:00 / Crankshaft dot at 6:00
TDC Cyl. #3) Camshaft dot at 10:30 / Crankshaft dot at 9:00
If you have that and the timing cover off you don't even half to measure how far you turned the engine over, just line up the dots to the correct orientation and install.
Thanks,
Joseph