Setting Stud Mounted Rockers

[90LX_Notch]

The engine was stone cold. I set them at TDC for each cylinder by doing the following:

I started at #1 and turned the nut untill I had No play in the rocker arm (zero lash). Then I turned the nut 1/2 turn and tightened the set screw down. Then I followed the firing order and set each cylinder as noted above.

I started the engine and it made a lot of valve train noise. I removed the valve cover and set #1 on TDC. Both rockers are loose (Engine still warm).

Should I tighten them down as is? Or should I back the nuts off and start over?

This is my first time with stud mounts and I thought I did them right. Did I miss something?

Some stuff says 1/4 turn, others say 1/4 to 1/2, and yet others say upto 1 full turn.

Any help will be greatly appreciated.

Thanks,
Bob

[90LX_Notch]

Can anyone please respond? I want to get this thing backup and running. I don't see where I went wrong. It's not roller rocker noise, it sounds like the lifter bouncing up and down on the cam.

[mean lx]

Make sure you are on the base circle of the cam when setting your lash. I tighten the rocker until the pushrod no longer turns freely by hand, then tighten another half turn. Make sure you tighten your allen head set screws after final adjustment. Are your valve springs new and if not did you have them tested to see if they meet the spring pressure requirements for the cam you have in the motor?......James

[90LX_Notch]

New heads with springs. Both valves were closed on each cylinder, so I should have been on the base circle. I tightened the set screw after setting the adjusting nut. The cam is a B303, the heads are AFR 165 with 58cc chambers and emmissions passages (street heads). The rocker arms are Scorpion 1.72. That's why I don't get why it's noisy.

[mean lx]

Roller rockers actually produce more noise than standard rocker arms. As far as them being loose, if the lifter is not on the base circle of the cam while adjusting the rocker arm, it will be loose when you check it once it is on the base circle of the cam. It's more a pain in the ass, but you can also adjust the intake rocker when the exhaust is fully depressed or the lifter is sticking out of the bore at max lift and vice versa for the exhaust.....James

[90LX_Notch]

Thanks for your responses. I got it straightened out tonight. Now it sounds like "normal" roller rockers.

[sgarcia]

Originally posted by 90LX_Notch
Thanks for your responses. I got it straightened out tonight. Now it sounds like "normal" roller rockers. how did you fix the problem ? cause im having problems with mine making noise after putting my car back together after a nitrous backfire that blew both head gaskets,we adjusted the rockers twice even after letting the car warm up .the noise went away alittle but it's still loud when i rev the car .could the lifters be bad after sitting for almost 2 months?

[Dave Bandt]

Try setting the lifters like this.....

Start with #1 or #5 cylinder on the very front most spring and work your way towards the back of the engine. This will keep you from getting confused and forgetting one or two valves. Get yourself a remote starter solenoid for $30 or you'll wind up peeling your knuckles using a breaker bar to spin the motor over. Anyway.....turn the motor until the exhaust valve just begins to open. At that point the intake lobe is on the base circle.....so set the lash. After you adjust the intake, turn the motor over until the intake goes past full lift and is closing. You want to set the exhaust lash when the intake valve is about 2/3 closed after reaching full lift. Setting you lash in this fashion should eliminate all chances of setting them when not on the base circle.

Good luck.....

[533stroker]

Do it like Dave said. the remote starter is the only way to fly. Then go down each head front to back watching the valves and getting them in position. I never set mine when both the valves are closed thinking they are at TDC.

[sgarcia]

Originally posted by 533stroker
Do it like Dave said. the remote starter is the only way to fly. Then go down each head front to back watching the valves and getting them in position. I never set mine when both the valves are closed thinking they are at TDC. we did that 3 times and still theyr clacking away :mad: ima take it apart today and change lifters .what would make a lifter go bad???

[RickKersey]

sgarcia, did you check to make sure you did not bend any pushrods or damage lifters?

[sgarcia]

Originally posted by RickKersey
sgarcia, did you check to make sure you did not bend any pushrods or damage lifters? i took it apart and i don't see anything wrong with lifters or pushrods.pushrods look straight.i havent put it back together havent had time plus i need to get new lifters .im going to see if that is my problem