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Thread: Really need to find TDC?
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04-25-2008, 04:30 PM #1
- Join Date
- Feb 2007
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- San Jose, CA
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Black- 2000 Trans Am WS6
Really need to find TDC?
Hey guys,
I checked the rockers and pushrods as a potential source of a knock in the engine. They look fine, but putting everything back together is a bit more complicated than I thought. The Haynes manual claims you need to get certain pistons to TDC as you re-tightening certain rockers.
Is this really necessary? The procedure they quote for finding TDC involves removing the plugs and sticking a screwdriver into the cylinder, then manually rotating the crackshaft and watching for the screwdriver to get to the position of maximum sticking out. Beyond the fact that there's a big frickin wheel well and power brake assist making it impossible to get a screwdriver into the cylinder, it just seems like a lot of extra work.
Does anyone who has replaced their rockers have any feedback?
Thanks,
Matt
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04-25-2008, 09:28 PM #2
Yea, I'm pretty sure its necessary to adjust them properly.
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04-25-2008, 11:28 PM #3
I can tell you how I did it which probably isn't right but it worked for me. I just turned the motor by hand and watched the pushrod. Once the pushrod showed that the valve was closed I torqued the rocker down. That's just how I did it.
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04-26-2008, 05:35 PM #4
- Join Date
- Feb 2007
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- San Jose, CA
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Black- 2000 Trans Am WS6
That's a good idea. I assume the only reason the pistons have to be in a certain position is to guarantee the valves are closed when the rockers are tightened. Is that correct? If so, any time during the compression stroke or power stroke should be ok, yes?
Thanks,
Matt
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04-27-2008, 05:37 AM #5
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04-30-2008, 04:18 AM #6
what i do is slowly tighten them all down. then, torque them all down to 22 ft-lbs. then turn the motor over one revolution and recheck the torque. never had any issue.
Cold Air Intake, Muffler Delete, Vinci High Performance Dual Valve Springs, Hardened Pushrods, Yella Terra 1.85 Rockers, Some Hydropdipped Stuff, Strut Tower Brace, Some SS Badges, boost/vacuum gauge, fuel pressure gauge, some checkered stripes, drilled/slotted rotors, ZL1addons Stealth wickerbill, Ruxifey LED side markers
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04-30-2008, 01:13 PM #7
- Join Date
- Feb 2007
- Location
- San Jose, CA
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Black- 2000 Trans Am WS6
I did them one at a time just to be safe, making sure each piston was right around the compression/power transition when I tightened it down. Seems to have worked. I'm sure it was overkill, but I didn't want to screw up something that important.
Anyway, the rods/rockers weren't causing the knocking I heard. Listening with a stethoscope, it sounds like it's on that side of the engine (odd cylinders). Anyone have other ideas as to what it might be? I've seen a mention or two about the lifters, but I'm not sure what about a lifter can go bad. I guess it could be the valves, but I don't think they're adjustable anyway. What experiences do people have with knocking?
Thanks,
Matt
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04-30-2008, 05:49 PM #8
I'm pretty sure a lifter could go bad if you over tightened the rocker.
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04-30-2008, 05:51 PM #9
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04-30-2008, 10:54 PM #10
- Join Date
- Feb 2007
- Location
- San Jose, CA
- Posts
- 24
Black- 2000 Trans Am WS6
Kind of inconsequential as the knocking existed before I or any mechanic touched the rockers. What does it mean for a lifter to "go bad"?
Thanks,
Matt
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05-03-2008, 10:34 AM #11
- Join Date
- May 2008
- Location
- Lex Vegas, KY
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- 48
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- 17
Maple Red Metallic- 2002 Pontiac Trans Am
The rockers on a stock LS1 are not adjustable. Just torque them all down to 22 lb/ft and then rotate the crank 360 degrees and retorque, just as someone said earlier.
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05-06-2008, 11:18 AM #12
Ditto for MattD.
tighten them all rotate 360* and retighten.
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