Home  |  Forums  |  914 Info  |  Blogs
 
914World.com - The fastest growing online 914 community!
 
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.
 

Welcome Guest ( Log In | Register )

2 Pages V  1 2 >  
 Reply to this topicStart new topic
> Heat Exchanger Nut Tool, 914-6 Hex Nut
DennisV
post Aug 20 2026, 09:07 AM
Post #1


Senior Member
***

Group: Members
Posts: 1,022
Joined: 8-August 20
From: Santa Rosa, CA
Member No.: 24,575
Region Association: Northern California
What have you found or fabricated to tighten the 13 ATF hex nut on 914-6 heat exchanger passenger side? I think that's cylinder number 1.

I'm sure this is probably mechanics 101, but I'm having a hard time with it. I've tried every combination of 1/4 socket, u-joint, wobble extender, flex driver I can find. No room for a box or open end wrench as 2 sides are blocked by bracket and pipe. Nothing I've tried provides enough engagement to properly tighten it.

Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Cairo94507
post Aug 20 2026, 09:13 AM
Post #2


Michael
**********

Group: Members
Posts: 10,747
Joined: 1-November 08
From: Auburn, CA
Member No.: 9,712
Region Association: Northern California
Hi Dennis, Yeah there is a special wrench that is bent kind of like a Z that allows you to get in there and tighten that nut with ease. Good luck, Michael (IMG:style_emoticons/default/beerchug.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
rudedude
post Aug 20 2026, 09:23 AM
Post #3


Senior Member
***

Group: Members
Posts: 574
Joined: 1-January 05
From: minneapolis, mn
Member No.: 3,387
Region Association: Upper MidWest
SSI included either a 12mm or 13mm z shaped wrench with their replacement exchangers. Maybe ask around. I have used 12mm across the flats nuts and seems to make it easier.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
sixnotfour
post Aug 20 2026, 11:05 AM
Post #4


914 Wizard
**********

Group: Members
Posts: 11,344
Joined: 12-September 04
Member No.: 2,744
Region Association: NineFourteenerVille
best kept secret,,
https://www.amazon.com/dp/B0BB8R2973?lv=shu...rect=mhFallback
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Steve
post Aug 20 2026, 11:35 AM
Post #5


914 Guru
*****

Group: Members
Posts: 6,070
Joined: 14-June 03
From: Laguna Niguel, CA
Member No.: 822
Region Association: Southern California
I use a stubby 13mm wrench. I did see S wrenches on Amazon. Never seen a Z wrench
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
mepstein
post Aug 20 2026, 11:45 AM
Post #6


914-6 GT in waiting
***************

Group: Members
Posts: 20,876
Joined: 19-September 09
From: Landenberg, PA/Wilmington, DE
Member No.: 10,825
Region Association: MidAtlantic Region
Often called a distributor wrench


Attached thumbnail(s)
Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
sixnotfour
post Aug 20 2026, 12:14 PM
Post #7


914 Wizard
**********

Group: Members
Posts: 11,344
Joined: 12-September 04
Member No.: 2,744
Region Association: NineFourteenerVille
The support strap needs the hole slotted so it can move away , If you insist on a 13mm hex.. and your studs short..
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Superhawk996
post Aug 20 2026, 01:16 PM
Post #8


914 Guru
*****

Group: Members
Posts: 8,004
Joined: 25-August 18
From: Woods of N. Idaho
Member No.: 22,428
Region Association: Galt's Gulch
QUOTE(sixnotfour @ Aug 20 2026, 02:14 PM) *

and your studs short..

(IMG:style_emoticons/default/agree.gif) Thats going to fail.

Crows foot is another option for tools
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
porschetub
post Aug 20 2026, 04:40 PM
Post #9


914 Guru
*****

Group: Members
Posts: 5,158
Joined: 25-July 15
From: New Zealand
Member No.: 18,995
Region Association: None
QUOTE(Superhawk996 @ Aug 21 2026, 07:16 AM) *

QUOTE(sixnotfour @ Aug 20 2026, 02:14 PM) *

and your studs short..

(IMG:style_emoticons/default/agree.gif) Thats going to fail.



Sadly yes (IMG:style_emoticons/default/agree.gif) ,not enough thread to support the hex nuts or the barrel nuts if all studs are the same ,well prior to fitting my exhaust I removed one bad one and ordered 12 new studs from Pelican , length was spot on .
The only fix I can see is to restud the heads ..don't think there is any other solution .
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
fixer34
post Aug 20 2026, 05:38 PM
Post #10


Senior Member
***

Group: Members
Posts: 1,465
Joined: 16-September 14
From: Chicago area
Member No.: 17,908
Region Association: Upper MidWest
Want to say I used a ratcheting box end, swivel head wrench.
I'll see if I can get a picture of it tomorrow.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
mepstein
post Aug 20 2026, 06:23 PM
Post #11


914-6 GT in waiting
***************

Group: Members
Posts: 20,876
Joined: 19-September 09
From: Landenberg, PA/Wilmington, DE
Member No.: 10,825
Region Association: MidAtlantic Region
Yea, unless that’s some sort of optical illusion, you’re going to have to fix that.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
nivekdodge
post Aug 20 2026, 06:52 PM
Post #12


Member
**

Group: Members
Posts: 339
Joined: 28-August 21
From: Pittsburgh Pa
Member No.: 25,860
Region Association: MidAtlantic Region
QUOTE(sixnotfour @ Aug 20 2026, 01:05 PM) *

best kept secret,,
https://www.amazon.com/dp/B0BB8R2973?lv=shu...rect=mhFallback

even on a four

kevin
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
DennisV
post Aug 21 2026, 07:33 AM
Post #13


Senior Member
***

Group: Members
Posts: 1,022
Joined: 8-August 20
From: Santa Rosa, CA
Member No.: 24,575
Region Association: Northern California
QUOTE(sixnotfour @ Aug 20 2026, 10:05 AM) *

best kept secret,,
https://www.amazon.com/dp/B0BB8R2973?lv=shu...rect=mhFallback

(IMG:style_emoticons/default/ohmy.gif) That is an interesting idea. Wasn't aware of these. Only the copper exhaust nuts which I think are 12 mm ATF and I was planning to transition to.

QUOTE(sixnotfour @ Aug 20 2026, 11:14 AM) *

and your studs short..


Thanks for pointing that out. I believe that's an optical illusion because I haven't tightened the nuts before taking that photo. At least I hope that's the case.

I've learned a painful lesson during this project. Never trust the stud height on anything. I would have liked to think that a highly rated machine shop would have caught / corrected these things, since they would have had to remove and reinstall in many cases, but clearly not. It has bitten me a couple time now. Too short on the intake side and I had to replace them all. One of the barrel nuts on the exhaust side was too long and I could only torque it to 10 ft. lbs. before the wrench hit the stud.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
DennisV
post Aug 21 2026, 07:42 AM
Post #14


Senior Member
***

Group: Members
Posts: 1,022
Joined: 8-August 20
From: Santa Rosa, CA
Member No.: 24,575
Region Association: Northern California
QUOTE(mepstein @ Aug 20 2026, 10:45 AM) *

Often called a distributor wrench

Thank you for the photo Mark. That helps clarify.

I started looking for an SSI wrench based on @rudedude comment. That is a crazy looking wrench!
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
mepstein
post Aug 21 2026, 10:35 AM
Post #15


914-6 GT in waiting
***************

Group: Members
Posts: 20,876
Joined: 19-September 09
From: Landenberg, PA/Wilmington, DE
Member No.: 10,825
Region Association: MidAtlantic Region
QUOTE(DennisV @ Aug 21 2026, 09:42 AM) *

QUOTE(mepstein @ Aug 20 2026, 10:45 AM) *

Often called a distributor wrench

Thank you for the photo Mark. That helps clarify.

I started looking for an SSI wrench based on @rudedude comment. That is a crazy looking wrench!

Yes, we also called them an Ssi wrench but distributor wrench will be an easier search. Definitely worth grabbing one for the tool box. They are pretty inexpensive.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
bdstone914
post Aug 22 2026, 09:50 PM
Post #16


bdstone914
*****

Group: Members
Posts: 5,360
Joined: 8-November 03
From: Riverside CA
Member No.: 1,319
@DennisV

Attached Image
[/quote]

Are all the studs the same lenght? The one puctured is too short.
Why is the piece of metal under the nut?


Attached thumbnail(s)
Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
DennisV
post Aug 23 2026, 08:07 AM
Post #17


Senior Member
***

Group: Members
Posts: 1,022
Joined: 8-August 20
From: Santa Rosa, CA
Member No.: 24,575
Region Association: Northern California
QUOTE(bdstone914 @ Aug 22 2026, 08:50 PM) *

Why is the piece of metal under the nut?

I can't tell you its purpose. Only that it is a new heat exchanger and there is a little bracket there.

Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
mepstein
post Aug 23 2026, 08:47 AM
Post #18


914-6 GT in waiting
***************

Group: Members
Posts: 20,876
Joined: 19-September 09
From: Landenberg, PA/Wilmington, DE
Member No.: 10,825
Region Association: MidAtlantic Region
QUOTE(DennisV @ Aug 23 2026, 10:07 AM) *

QUOTE(bdstone914 @ Aug 22 2026, 08:50 PM) *

Why is the piece of metal under the nut?

I can't tell you its purpose. Only that it is a new heat exchanger and there is a little bracket there.




It’s stock oem
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Steve
post Aug 23 2026, 12:22 PM
Post #19


914 Guru
*****

Group: Members
Posts: 6,070
Joined: 14-June 03
From: Laguna Niguel, CA
Member No.: 822
Region Association: Southern California
QUOTE(mepstein @ Aug 23 2026, 07:47 AM) *

QUOTE(DennisV @ Aug 23 2026, 10:07 AM) *

QUOTE(bdstone914 @ Aug 22 2026, 08:50 PM) *

Why is the piece of metal under the nut?

I can't tell you its purpose. Only that it is a new heat exchanger and there is a little bracket there.




It’s stock oem

It helps prevent the exchanger from rattling.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
sixnotfour
post Aug 23 2026, 02:43 PM
Post #20


914 Wizard
**********

Group: Members
Posts: 11,344
Joined: 12-September 04
Member No.: 2,744
Region Association: NineFourteenerVille
Dansks version of the bracket... is the odity.
Rusty OG in Pictures...
Nuts...

13mm Hex. notice ample room around hex for a flex socket 1/4 drive.
Attached Image

12mm Hex. More room..
Attached Image

10mm Hex flange,, non locking.. easy. Bug guys used to pay $3 a piece for these..
Attached Image

Countdown .. 13 12 10mm.. notice the same diameter contact area.. 10 & 13 slightly more than a plain 12 nut..
Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
« Next Oldest · 914World Garage · Next Newest »
 

2 Pages V  1 2 >
Reply to this topicStart new topic
2 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
1 Members: JamesM

 

Display Mode: Standard · Switch to: Linear+ · Switch to: Outline

Track this topic · Email this topic · Print this topic · Subscribe to this forum

- Lo-Fi Version Time is now: 24th August 2026 - 01:13 PM
Invision Power Board v9.1.4 © 2026  IPS, Inc.
...
All rights reserved 914World.com © since 2002
914World.com is the fastest growing online 914 community!
We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ...