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  Screw In Studs Problem

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Author Topic:   Screw In Studs Problem
bifs66
Gearhead

Posts: 240
From: Maryland
Registered: Apr 2000

posted 08-27-2002 05:09 PM     Click Here to See the Profile for bifs66   Click Here to Email bifs66     Edit/Delete Message   Reply w/Quote
Just passing on my most recent experience. The new engine in the Fastback was running great, at least for 500 mi, until I felt a slight miss and a little different note in the exhaust sound. No other noises were evident. The # 2 plug showed wet. So I pulled the valve cover as it was about time to check the valve lash anyway (solid lifters). Much to my surprise, the # 2 intake roller rocker and complete stud assembly was out of the head and laying on its side. It had obviously traveled all the way down the head, banging between the other roller rockers and the top of the valve cover. Apparently, after its trip/trips, it returned to the opening where it started and fell to its side. Five additional roller rockers lay scarred, scrapped, and damaged; as well as one pushrod and the inside top of the valve cover. The errant stud had merely rotated itself out of its threads. That's the one thing that I didn't check... the torque on the studs as I assumed the guys that assembled the heads/valve train did that part. Anyway, don't take anything for granted and recheck everything. Has anyone else ever seen a stud unscrew itself? I'm going to remove all the other studs and retorque with red loc-tite (unless something else should be done).

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Bernie Frank
66 Fastback restomod project
85 GT (preserved)
82 GT (original)

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Moneymaker
Administrator

Posts: 25052
From: Lyons, IL, USA
Registered: May 99

posted 08-27-2002 08:54 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
Only when some MORON installs them!
Don't you just hate incompetance?

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Alex Denysenko
Co-Administrator and Moderator/ non 65-66 Mustang owner sensitivity co-ordinator

NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Part time secret agent license #0089
Professional Manwhore
The Barry of BarrysGrrl

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Pierre
Gearhead

Posts: 541
From: Near Paris, France
Registered: Apr 2002

posted 08-28-2002 05:11 AM     Click Here to See the Profile for Pierre   Click Here to Email Pierre     Edit/Delete Message   Reply w/Quote
On alum heads, I was instructed to use anti-seize compound (NO LOCTITE !!) and to torq accordingly ...... Does that sound right ?

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stang106
Gearhead

Posts: 780
From: God's Country!... Port Alberni B.C. Canada
Registered: Jul 2001

posted 08-28-2002 07:53 AM     Click Here to See the Profile for stang106   Click Here to Email stang106     Edit/Delete Message   Reply w/Quote
I had a simular odd sound and took the valvecover off for a look-see and both the roller rockers and locks were on the head, some damage but reusable; some MORON had somehow forgot to tighten the lock on the two adjuster nuts. Did I mention that I do all my own work? I loc-tighted my studs and they are in cast iron.
Dave

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Hell_Fish
Gearhead

Posts: 860
From: Austin, TX.
Registered: May 2002

posted 08-28-2002 09:20 AM     Click Here to See the Profile for Hell_Fish   Click Here to Email Hell_Fish     Edit/Delete Message   Reply w/Quote
I found on the heads I just put on, the machine shop didn't chase/clean the bolt holes. I found all kinds of blast media in the intake holes. I will have to tap the exhaust holes next. Yep, you pay enough, you figure they will do it right, but its not anyways the case. Hope your damage is minimal.

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Dustin C
[IMG]http://pages.moparpages.com/duster/sigs/hell_fish.gif[/IMG]
56 F-100
Mech. for wifes 69 Mustang coupe
65 Plymouth Barracuda
70 Dodge Swinger

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