Pelican Parts
Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   Pelican Parts Forums > Porsche Forums > 911 Engine Rebuilding Forum


Reply
 
LinkBack Thread Tools Rate Thread
Author
Thread Post New Thread    Reply
Registered
 
Join Date: Oct 2006
Location: St. Augustine, FL
Posts: 540
Garage
Question on Head Stud Threads

I think I did a foolish thing this weekend. I used a 10Mx1.5 tap (Snap-on) to clean out the head stud threads of any old loctite that might still be in there before I install 12 replacement steel studs. The tap threaded in with only mild resistance and didn't appear to be removing any metal in the process (or I'd have stopped immediately), so I wasn't initially concerned. Afterward, I tried threading in one of the old Dilavar studs and it threads in with no resistance at all.

I'm sure the studs need to be a snug fit into the case and I'm angry at myself for doing this without checking after the first one (I know better)...

Have I screwed up (no pun intended )? Is this an acceptable condition, or is it a problem? Can I simply install the studs with fresh Loctite, or should I have threaded inserts installed? Is there any other compound (other than loctite) recommended for use to install the studs in this condition?

Btw, this is a '79 3.0 Alum case.

Thx, Mike

__________________
'84 Carrera Targa (3.0 with SSIs, Webers, DC-19 Cams, MSD) - Sold

Last edited by SCrescue; 02-11-2008 at 02:34 PM..
Old 02-11-2008, 05:50 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #1 (permalink)
Registered
 
Join Date: Mar 2004
Location: So. Ca.
Posts: 521
A little green loctite and everything will be fine.

regards
Old 02-11-2008, 07:14 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #2 (permalink)
Registered
 
Join Date: Mar 2004
Location: So. Ca.
Posts: 521
Oh by the way use a thread roller like in a Time-Sert kit (for installing the insert) or one you can by from Snap On for thread restoration,m It will not cut material out but rools it back into place and restores the original pitch.
Old 02-11-2008, 07:17 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #3 (permalink)
Registered
 
Join Date: Oct 2006
Location: St. Augustine, FL
Posts: 540
Garage
I have the green loctite (hi Temp retaining compound 40), I guess all I need now is the thread roller. Thanks.

Mike
__________________
'84 Carrera Targa (3.0 with SSIs, Webers, DC-19 Cams, MSD) - Sold
Old 02-11-2008, 02:38 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #4 (permalink)
Registered
 
Join Date: Mar 2004
Location: So. Ca.
Posts: 521
The thread roll tap is for next time, leave the case alone and assemble with the green Loctite that has bearing mount as a feature, high temp, etc.

regards
Old 02-11-2008, 04:03 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #5 (permalink)
Registered
 
Join Date: May 2003
Posts: 3,346
Don't worry about it. As long as the locktite keeps the stud from turning when you put on the headstud nuts you'll be fine.

-Andy
__________________
72 Carrera RS replica, Spec 911 racer
Old 02-12-2008, 09:10 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #6 (permalink)
 
Registered
 
Join Date: Nov 2000
Location: Dallas
Posts: 3,577
I seem to recall just seeing a comment that a thread cleaner could be made from an old exhaust stud simply by using something like a dremel tool and a cutting wheel to make a slice in the threads, I assume perpindicular. Should this be done with a new stud or an old one. Should the slice simply be that, a slice or should one side or the other be tapered a bit to hold the loctite or whatever is being cleaned out of the threads?
__________________
Buck
'88 Coupe, '87 Cab,
'88 535i sold, '19 GLC 300 DD
Warren Hall, gone but not forgotten
Old 02-13-2008, 07:31 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #7 (permalink)
Registered
 
Join Date: Oct 2006
Location: St. Augustine, FL
Posts: 540
Garage
Thanks for the sanity check guys (racing97 & Eagledriver)

Quote:
I seem to recall just seeing a comment that a thread cleaner could be made from an old exhaust stud simply by using something like a dremel tool and a cutting wheel to make a slice in the threads, I assume perpindicular. Should this be done with a new stud or an old one. Should the slice simply be that, a slice or should one side or the other be tapered a bit to hold the loctite or whatever is being cleaned out of the threads?
That makes sense to me, wish I'd heard of it, or thought of it before using the tap first. I'd guess a good used stud would work fine (I have plenty of used dilavars I no longer need). I suppose one or more vertical slices down the threads would reasonably clean out the old loctite for sure. Thx

Mike

__________________
'84 Carrera Targa (3.0 with SSIs, Webers, DC-19 Cams, MSD) - Sold
Old 02-13-2008, 08:31 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #8 (permalink)
Reply


 


All times are GMT -8. The time now is 05:48 PM.


 
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2025, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2025 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page
 

DTO Garage Plus vBulletin Plugins by Drive Thru Online, Inc.