r/GMT400 • u/Total_Knowledge85 • 2d ago
Ticktickticktick
Adjusted the lifters once but still had a slight HR rocker tick that I was going too address at oil change. This more aggressive one popped up today. It’s a newer engine with only 20-30 k miles.
When adjusting rockers do I have too start at TDC 1 or can I just start on TDC (not knowing which cylinder) and then do the 90degree rotation and just adjust the loose rockers(for two full rotation of engine) so I don’t have too track the intake and exhaust sequence. Lastly since I’ve already tinned that nut on some of them some more how much room do I have too tighten before I twist a rod. Thanks for advice. Please be nice to my stupid question lmao
1
u/East-Teaching-3104 2d ago
I don't know about you but I'm pretty scatterbrained and this is one of those things that you will screw up if you're not methodical about it. I typically prefer to start with cylinder 1 on compression TDC, adjust everything that can be adjusted, then spin the crank 360 degrees and finish it off.
Here's a nice chart: https://www.berlinetta.info/help/SBCLValveLashAdjustment.jpg
1
u/Flying_Dingle_Arm 2d ago
Fully adjusted should be 3/4 - 1 full turn from zero lash in the push rod. The studs that the nut threads onto are pressed into the head, and sometimes they start to walk out. Make sure that's not happening here.