This is topic Rocker Arms.... frustration in forum Tech Talk at Northern California Ford Owners  .


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Posted by cemelevu (Member # 10601) on :
 
1991 5.0 Afr 165 smog legal heads. 1.7 crane "Pedestal" mount rockers.

I set the "pre-load" by bringing each piston to TDC, prime the system with a reversable drill, tighten the bolt by hand until the slack is taken up, then a 1/4 turn after that.

The issue I am having is I have some of the bolts back off after startup. I will let it idle for about 1-2 minutes then I can hear some "chatter" from some of the rocker arms. Shut it off and repeat my process on the pistons that the rocker arms are loose on. Start it up, let it idle and it repeats the issue. Same rocker arms. What could be the issue?
 
Posted by Duncan Motors (Member # 7045) on :
 
thats not how u set preload on a pedestal rocker at all. and when they are set they need to be torqued, u are setting them like a stud mount rocker, hopefull u didnt cause damage to the pedestal mounts or bolts. somebody on here well send u a link on how to properly set and then torque them
 
Posted by cemelevu (Member # 10601) on :
 
Alright, so if I back them off, and start over again would this be the proper way? https://www.youtube.com/watch?v=3xM1v1HZ2Wg&feature=youtube_gdata_player. I tried it this way and didn't have much luck for some reason.
 
Posted by Duncan Motors (Member # 7045) on :
 
like i said. hes adjusting stud mount rockers, u have pedestal mount. so no that is wrong,
 
Posted by cemelevu (Member # 10601) on :
 
damn i just re-watched the video... sorry about that.
 
Posted by cemelevu (Member # 10601) on :
 
ok, so this sounds more like it. https://www.youtube.com/watch?v=z8NW0R0kDiY&feature=youtube_gdata_player

again I am sorry if I am wasting any ones time, I just need to get this thing running correctly.

also, keep in mind that all the valve train has been run before with this engine.
 
Posted by wilit (Member # 3367) on :
 
I've never done what that dude in the 2nd vid does. I've always torqued pedestal rockers to spec and drove away.
 
Posted by Beastly GT500 TVS (Member # 9723) on :
 
hope this helps

https://www.youtube.com/watch?v=oeLWK0LpTc4
 
Posted by cemelevu (Member # 10601) on :
 
quote:
Originally posted by Beastly GT500 TVS:
hope this helps

https://www.youtube.com/watch?v=oeLWK0LpTc4
This does. Looks like I'm gonna be starting at square one again..

This is the last, and I mean absolute last time I get pedestal mount rocker arms.
 
Posted by Beastly GT500 TVS (Member # 9723) on :
 
quote:
Originally posted by cemelevu:
quote:
Originally posted by Beastly GT500 TVS:
hope this helps

https://www.youtube.com/watch?v=oeLWK0LpTc4
This does. Looks like I'm gonna be starting at square one again..

This is the last, and I mean absolute last time I get pedestal mount rocker arms.
There not actually bad. Its just different set up than stud mount. When I had my fox I ran the cran/93 cobra 1.7 rr and they worked great with my stock push rods
 
Posted by cemelevu (Member # 10601) on :
 
quote:
Originally posted by Beastly GT500 TVS:
quote:
Originally posted by cemelevu:
quote:
Originally posted by Beastly GT500 TVS:
hope this helps

https://www.youtube.com/watch?v=oeLWK0LpTc4
This does. Looks like I'm gonna be starting at square one again..

This is the last, and I mean absolute last time I get pedestal mount rocker arms.
There not actually bad. Its just different set up than stud mount. When I had my fox I ran the cran/93 cobra 1.7 rr and they worked great with my stock push rods
Thats exactly what I have. With the e-cam.
 
Posted by racsirx (Member # 1710) on :
 
In that video it talks about getting different push rods since the heads were shaved, if you already have the push rods and you shaved the heads, you can get a shim kit to make up the difference.
 
Posted by cemelevu (Member # 10601) on :
 
Well the issue of the rocker arms backing off have been solved. Thanks to those that gave suggestions.
 
Posted by Duncan Motors (Member # 7045) on :
 
sorry i wasn't much help, its hard for me to explain what i naturally know, and sometime in detail like what your doing, its hard for to explain, , an running a business i dont have much time, but i knew what u showed was wrong and knew somebody that is commuter link savage would help shortly and they did, glad u firgured it out, ounce u got it figured pedestal is easier than anything else.
 




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