This is topic Rocker arm question???? in forum Tech Talk at Northern California Ford Owners  .


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Posted by 91 5.0 (Member # 1527) on :
 
I have stock heads and 1.72 Ford motorsport roller rockers. I recently got my heads decked and put them back on a different short block that im putting in my car. When I torqued the rockers, I noticed that the plungers on the lifters depresseed, even when the cam lobes are at zero lift. The valves are closing all the way, but once I turn the car on and the oil pressure builds up, am I going to have a problem with the valves not closing???
 
Posted by 91 5.0 (Member # 1527) on :
 
no one????????????
 
Posted by st5150 (Member # 51) on :
 
How long was the motor not running/apart? (Did your lifters bleed out?)
 
Posted by mustanggt5091 (Member # 444) on :
 
[Confused] How long was it apart! Are you using the same heads?
 
Posted by Quick 88LX (Member # 1950) on :
 
quote:
Originally posted by 91 5.0:
I have stock heads and 1.72 Ford motorsport roller rockers. I recently got my heads decked and put them back on a different short block that im putting in my car.
Looks to me like he is. Where is 93PONY??
 
Posted by rokcrln (Member # 2536) on :
 
Well by decking the heads you kind of made your pushrods longer. I know fords are pre set for valve lash to push rod length but I don't know what room you have to play with.

[ June 02, 2003, 05:33 PM: Message edited by: rokcrln ]
 
Posted by shade-tree (Member # 298) on :
 
the spec for a hydraulic roller lifter is about 0.03" of pre-load.

How did you torque the rockers? What sequence did you follow?

Set them to the proper pre-load, and no further. Also use a torque wrench since they are pedestal rockers and ensure that the torque value is in range simultaneously with the pre-load. (i.e. wiggle the pushrod till it 'drags', and then go 1/2 a turn further).

If not you fuck the whole thing up. Trust me on that one :/
 
Posted by rokcrln (Member # 2536) on :
 
[QUOTE]Originally posted by shade-tree:
[ (i.e. wiggle the pushrod till it 'drags', and then go 1/2 a turn further).

Sounds like the old chevy's I have done in the past. My 302 was like 35ibl or some shit
 
Posted by 91 5.0 (Member # 1527) on :
 
im using the same stock heads. They were machined though.

SHADE TREE--I turned the motor until cylinder #1 was on its compression stroke, then torqued to 22 ft/lbs. Then proceeded to cylinder #2 on its compression stroke, and so on. Now you said .03 of preload? Is it .03, or .003? And if my pre-load is too much, how do I change that? Is using shims under the rocker the only way?
 
Posted by jph331 (Member # 665) on :
 
You need to buy some shims to change the valve clearance. They go underneath the rocker in that little rail. Check here
http://www.cranecams.com/master/shimstud.htm
 
Posted by 91 5.0 (Member # 1527) on :
 
Yeah, thats what I figured. Ive got a pack of shims, im not sure if ive got enough though.
 
Posted by 91 5.0 (Member # 1527) on :
 
Does anyone know where I can pick up some shims locally? The rockers are FMS if that matters.
 




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