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Author
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Topic: Rocker Arms.... frustration
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cemelevu
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Member # 10601
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posted
 
 
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?
Posts: 474 | Registered: Jan 2011
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Duncan Motors
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Member # 7045
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posted
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
Posts: 6310 | From: Vallejo | Registered: Sep 2006
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Duncan Motors
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Member # 7045
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posted
like i said. hes adjusting stud mount rockers, u have pedestal mount. so no that is wrong,
Posts: 6310 | From: Vallejo | Registered: Sep 2006
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cemelevu
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Member # 10601
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posted
damn i just re-watched the video... sorry about that.
Posts: 474 | Registered: Jan 2011
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wilit
Mustang Messiah
Member # 3367
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posted
I've never done what that dude in the 2nd vid does. I've always torqued pedestal rockers to spec and drove away.
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"If a man hasn't found something worth dying for, he isn't fit to live." - Martin Luther King Jr.
Posts: 4793 | From: 37.78514° North 122.40100° West | Registered: Oct 2003
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cemelevu
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Member # 10601
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posted
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.
Posts: 474 | Registered: Jan 2011
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Beastly GT500 TVS
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Member # 9723
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posted
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
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91/E85 tune by SHAUN AT AED
700HP/700TQ ON E85
10.78@129MPH 1.644 60FT
WWW.AEDHP.COM
Posts: 893 | From: 707 | Registered: Jan 2010
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cemelevu
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Member # 10601
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posted
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.
Posts: 474 | Registered: Jan 2011
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racsirx
CAFords OG
Member # 1710
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posted
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.
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88 Saleen #564
88 GT 331 NOVI2000
88 Coupe TURBO 9.75@142
95 Cobra R #75-SOLD
06 F250
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GOD'S NOT DEAD
Posts: 20750 | From: Concord & Pittsburg, CA | Registered: Aug 2002
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cemelevu
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Member # 10601
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posted
Well the issue of the rocker arms backing off have been solved. Thanks to those that gave suggestions.
Posts: 474 | Registered: Jan 2011
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Duncan Motors
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Member # 7045
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posted
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.
Posts: 6310 | From: Vallejo | Registered: Sep 2006
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