Setting roller rockers

**mrjoshua** · 04-14-2012, 07:27 AM

I backed my H.S. Roller rocker arms last fall on any that had tension. I have to re set them. I've never done it. I do have the proper tool for the job just want to make sure there is no real trick to it..
1 Roll the engine over by hand until the intake valve just begins to open and then set the corresponding exhaust valve correct?
2 Tighten until you feel a bit of tension rotating the push rod with fingers, the another half turn tightening the poly and adjusting screw at the same time?
3 for intake valve rotate engine until exhaust valve just begins to close and set the corresponding intake valve the same way.

Seems simple..........

**ICECREAMAN** · 04-14-2012, 07:43 AM

"Adjust the intake valve when the exhaust valve begins to open.
Adjust the exhaust valve when the intake is at least half closed."
Courtesy, Reher Morrison, Championship Engine Assembly.

**Last Mohican** · 04-14-2012, 07:55 AM

Do you know what cam you have? Hydraulic adjusts with zero lash or pre load. Mechanical has lash.

**southwind21** · 04-14-2012, 08:24 AM

Mohicans right on

**Mash on It** · 04-14-2012, 09:36 AM

On a properly adjusted hydraulic sbc/bbc valve, the pushrod will turn pretty easy, and using the "spin the pushrod" method maybe too tight. I feel for zero lash by "jiggling" the pushrod up and down, then 1/8 to 1/4 turn, or .060" preload, on hydraulic lifters, also works for mechanical lifters for setting lash.

Here is a way to adjust the valves by turning the crank once, factory firing order:

#1 TDC
EX 1 3 4 8
IN 1 2 5 7

#1, 180* out, or #6 TDC
EX 2 5 6 7
IN 3 4 6 8

I don't like turning the motor endless times between every valve- no oil pressure, major compression/friction, etc
Hope this helps

Daniel
Mash on it

**speedealer** · 04-14-2012, 12:23 PM

hey josh why don't you bring the boat by and we'll adjust your valves. give me a call don't have much going on after work this week.

**mrjoshua** · 04-14-2012, 06:12 PM

Originally Posted by speedealer

hey josh why don't you bring the boat by and we'll adjust your valves. give me a call don't have much going on after work this week.

That sounds great Richard I'll take you up on that. I'll be in touch
thanks to everybody for the responses

**HammerDown** · 04-14-2012, 10:34 PM

Originally Posted by Mash on It

On a properly adjusted hydraulic sbc/bbc valve, the pushrod will turn pretty easy, and using the "spin the pushrod" method maybe too tight. I feel for zero lash by "jiggling" the pushrod up and down, then 1/8 to 1/4 turn, or .060" preload, on hydraulic lifters, also works for mechanical lifters for setting lash.

Here is a way to adjust the valves by turning the crank once, factory firing order:

#1 TDC
EX 1 3 4 8
IN 1 2 5 7

#1, 180* out, or #6 TDC
EX 2 5 6 7
IN 3 4 6 8

I don't like turning the motor endless times between every valve- no oil pressure, major compression/friction, etc
Hope this helps

Daniel
Mash on it

I concur with the "turning of the engine endless times"
That's how I 'use' to do it...however...over on the DYNO section some red flags were raised with that method depending on the Cam profile > just saying.

**mrjoshua** · 04-15-2012, 06:54 AM

Originally Posted by Last Mohican

Do you know what cam you have? Hydraulic adjusts with zero lash or pre load. Mechanical has lash.

I did forget to say the cam is hyd roller. Again thanks for the responses. Always good useful advice here

**HammerDown** · 04-15-2012, 11:09 AM

Originally Posted by mrjoshua

I did forget to say the cam is hyd roller. Again thanks for the responses. Always good useful advice here

With my HYD Roller lifters and Iron heads, after zero lash 1/2-3/4 turn was suggested > Morel hyd-roller units used, and it took 3/4 to make them quiet. Just what works for me

**fourtznme** · 04-15-2012, 11:13 AM

Google Comp cams. They have all the info you will need.

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Setting roller rockers

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