 Stripped intake stud |
|
|
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
|
  |
| AE354803 |
 Oct 3 2012, 10:36 PM
Post
#1
|
|
Member  Group: Members Posts: 232 Joined: 13-August 12 From: Southern California Member No.: 14,801 Region Association: Southern California  |
I have a 2.0 type IV from a 914 in my 912, it has the GA heads and Weber 40 IDFs. Today I was warming it up to change the oil and saw flashing from the intake manifold/head seal area when small backfires occured. Naturally I started to tighten the intake manifold bolts. On the #1 cylinder outboard nut, I felt too much play. I wiggled the stud and pulled it right out!
See the picture below. I was able to find more threads in the hole and thread it back in using 2 nuts so it isn't completely stripped. Only about 1/4" of threads came out with the stud. What should I do here?  |
   |
 
|
| Dave_Darling |
Oct 3 2012, 11:31 PM
Post
#2
|
|
914 Idiot Group: Members Posts: 14,982 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California 
|
Looks like a heli-coil?
--DD |
|
|
|
| Mark Henry |
Oct 4 2012, 04:46 AM
Post
#3
|
|
that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
Whoever installed it backed the stud out because it was to short for the carb manifolds thicker flange. Try a longer stud to catch the remaining threads and if that doesn't work you will need to helicoil it.
BTW someone is bound to say helicoils suck and use a time-sert, yes they are better, but in this case there's little torque/load so a helicoil will work just fine. |
|
|
|
| TheCabinetmaker |
Oct 4 2012, 05:02 PM
Post
#4
|
|
I drive my car everyday Group: Members Posts: 8,300 Joined: 8-May 03 From: Tulsa, Ok. Member No.: 666 |
That does look like a heloicoil that has came loose. That is also not the proper stud. It actually looks like piece of all thread. The stud has a non machined area in the middle and is longer.
|
|
|
|
| Cap'n Krusty |
Oct 4 2012, 05:28 PM
Post
#5
|
|
Cap'n Krusty Group: Members Posts: 10,794 Joined: 24-June 04 From: Santa Maria, CA Member No.: 2,246 Region Association: Central California |
Looks like a Helicoil? I say not. It looks like aluminum that pulled with the stud. Happens all the time with studs that are too short for the application.
The Cap'n |
|
|
|
| Dave_Darling |
Oct 4 2012, 06:25 PM
Post
#6
|
|
914 Idiot Group: Members Posts: 14,982 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California
|
In my experience, the aluminum threads that come out with the stud tend to stay on the stud. Makes the end of the stud look shiny and relatively smooth. Also, I think I can see gaps in between the threads, which make me think it's a coil.
Not that my experience compares to the Cap'n's, but I may be better at stripping threaded holes than he is. (IMG:style_emoticons/default/wink.gif) --DD |
|
|
|
| AE354803 |
Oct 4 2012, 09:28 PM
Post
#7
|
|
Member Group: Members Posts: 232 Joined: 13-August 12 From: Southern California Member No.: 14,801 Region Association: Southern California |
QUOTE(Dave_Darling @ Oct 4 2012, 05:25 PM)  In my experience, the aluminum threads that come out with the stud tend to stay on the stud. Makes the end of the stud look shiny and relatively smooth. Also, I think I can see gaps in between the threads, which make me think it's a coil. Not that my experience compares to the Cap'n's, but I may be better at stripping threaded holes than he is. (IMG:style_emoticons/default/wink.gif) --DD When the metal was on the stud it was very smooth on the outside which made me think it was stripped aluminum. Does anyone know the proper length for the studs that have the flat machined section and also where to get them? Pelican turned up nothing. |
|
|
|
| euro911 |
Oct 4 2012, 11:44 PM
Post
#8
|
|
Retired & living the dream. God help me if I wake up! Group: Members Posts: 8,849 Joined: 2-December 06 From: So.Cal. & No.AZ (USA) Member No.: 7,300 Region Association: Southern California
|
I believe intake manifold studs are M8 x 1.25.
Use a depth gauge to measure the bore, then add the thickness of intake manifold, gasket, washer and nut to come up with the length you'll need. |
|
|
|
| HAM Inc |
Oct 5 2012, 06:31 AM
Post
#9
|
|
Senior Member Group: Members Posts: 846 Joined: 24-July 06 From: Watkinsville,GA Member No.: 6,499 Region Association: None |
Time-serts and heli-coils both require full thread engagement to prevent insert failure. I have seen each break when only a portion of the threads were engaged.
Time-serts are a cast alloy and heli-coils are wire. Each has certain frailties that require consideration. QUOTE Does anyone know the proper length for the studs that have the flat machined section and also where to get them? Pelican turned up nothing. QUOTE intake manifold studs are M8 x 1.25. Use a depth gauge to measure the bore, then add the thickness of intake manifold, gasket, washer and nut to come up with the length you'll need. Yes. |
|
|
|
|
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 9th May 2024 - 03:44 AM |
Invision Power Board
v9.1.4 © 2024 IPS, Inc.