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Username Post: proper method to adjust roller rockers?        (Topic#132072)
ChevelleFan 
Contributor
Posts: 328
ChevelleFan
Loc: Cleveland, OH
Reg: 06-04-04
05-21-06 07:53 AM - Post#939046    

Hey guys,

I have a set of roller rockers on my hyd. flat-tappet cam. When I put the engine together, I adjusted the valves by turning the pushrod with my fingers while I tightened down the adjusting nut. This got me close enough to start it.

My question is, what is the best way to final-adjust them? I know with stock rockers you can let the engine idle, loosen the nut until they make a tapping noise, then tighten them till it stops + 1/4 or 1/2 turn. Is this acceptable for roller rockers too?

Thanks,

-Dave
'70 Chevelle xxx/700r4/3.55 / Hotchkis A-arms / Hotchkis Springs / B-body 12" brakes / 1.25" F-body swaybar


 
doc1 
Senior Member
Posts: 457

Reg: 06-23-03
Re: proper method to adjust roller rockers?
05-21-06 12:07 PM - Post#939047    
    In response to ChevelleFan

To to the Crane Cams technical site. They have a tutorial on adjusting roller rockers.
I have roller tip rockers, and they call for 18ftlbs for final adjustment. Worked pretty well.
In the beginning was the Floyd, the Floyd was with him, and he was with the Floyd. Syd Barret left right after the happening.
Big blocks rule!


 
loudpedal 
Super Senior Member
Posts: 5010

Loc: corner of Walk & Dontwalk...
Reg: 07-28-00
Re: proper method to adjust roller rockers?
05-22-06 07:35 AM - Post#939048    
    In response to ChevelleFan

"""""""I have a set of roller rockers on my hyd. flat-tappet cam. When I put the engine together, I adjusted the valves by turning the pushrod with my fingers while I tightened down the adjusting nut. """""""

The lashing procedure is the same for any rocker arm whether roller or stamped type.

IF you have a good sensitive feel, twirling and moving the pushrod then zero lash (with the valve being adjusted on the heel of the cam lobe) plus 1/2" turn of the adjusting nut will be fine.

There is no reason to run the motor when seting valves.

Only use torque figures on those motors who use non-adjustable stud mounted rockers. Pontiac and some Fords come to mind.

 
ChevelleFan 
Contributor
Posts: 328
ChevelleFan
Loc: Cleveland, OH
Reg: 06-04-04
Re: proper method to adjust roller rockers?
05-23-06 04:17 AM - Post#939049    
    In response to loudpedal

Thanks for the info.. one last question. When reading Crane's instructions, they talk about doing one rocker at a time when installing an setting lash. I have an 11:1 motor, and I have to believe there's gotta be a better way than spinning the motor over all the time.

I have a list (not here at work) of 8 valves that can be adjusted when motor is at TDC firing #1, and then the other eight when at TDC #6. (one revolution after TDC #1) I was told it was accepted practice on stock Chevy V8s. Does it still apply with longer duration cams? I can post the specifics when I get home.

-Dave
'70 Chevelle xxx/700r4/3.55 / Hotchkis A-arms / Hotchkis Springs / B-body 12" brakes / 1.25" F-body swaybar


 
motorman 
Dedicated Enthusiast
Posts: 5170

Loc: south western pa.
Reg: 01-25-00
Re: proper method to adjust roller rockers?
05-23-06 04:26 AM - Post#939050    
    In response to ChevelleFan

Quote:

Thanks for the info.. one last question. When reading Crane's instructions, they talk about doing one rocker at a time when installing an setting lash. I have an 11:1 motor, and I have to believe there's gotta be a better way than spinning the motor over all the time.

I have a list (not here at work) of 8 valves that can be adjusted when motor is at TDC firing #1, and then the other eight when at TDC #6. (one revolution after TDC #1) I was told it was accepted practice on stock Chevy V8s. Does it still apply with longer duration cams? I can post the specifics when I get home.

-Dave


the best way to set hyd lifters is with the intake off and watch the lifter pushrod cup move downward about .020 as you set the preload. you never have to touch them again if you do it this way. doing one at a time will prevent collapsing the other hyd lifters the whole way down when turning the engine over till the pre load of .020 has been set.
retired race engine builder,former NASCAR tech inspector. new corvettes owned 1959,1962,1963,1964,1965, 1966,1997,1999,2002,2005, 2008 plus 30+ other chevy cars and trucks along the way. 2008 corvette sold and waiting on a C-7.


 
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