 Heat Exchanger Nut Tool, 914-6 Hex Nut |
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| DennisV |
  Aug 20 2026, 09:07 AM
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#1
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Senior Member  Group: Members Posts: 1,009 Joined: 8-August 20 From: Santa Rosa, CA Member No.: 24,575 Region Association: Northern California 
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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.  |
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| Cairo94507 |
Aug 20 2026, 09:13 AM
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#2
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Michael Group: Members Posts: 10,741 Joined: 1-November 08 From: Auburn, CA Member No.: 9,712 Region Association: Northern California
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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)
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| rudedude |
Aug 20 2026, 09:23 AM
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#3
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Senior Member Group: Members Posts: 574 Joined: 1-January 05 From: minneapolis, mn Member No.: 3,387 Region Association: Upper MidWest
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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.
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| sixnotfour |
Aug 20 2026, 11:05 AM
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#4
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914 Wizard Group: Members Posts: 11,333 Joined: 12-September 04 Member No.: 2,744 Region Association: NineFourteenerVille 
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best kept secret,,
https://www.amazon.com/dp/B0BB8R2973?lv=shu...rect=mhFallback |
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| Steve |
Aug 20 2026, 11:35 AM
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#5
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914 Guru Group: Members Posts: 6,068 Joined: 14-June 03 From: Laguna Niguel, CA Member No.: 822 Region Association: Southern California
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I use a stubby 13mm wrench. I did see S wrenches on Amazon. Never seen a Z wrench
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| mepstein |
Aug 20 2026, 11:45 AM
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#6
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914-6 GT in waiting Group: Members Posts: 20,864 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region
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Often called a distributor wrench
Attached thumbnail(s) 
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| sixnotfour |
Aug 20 2026, 12:14 PM
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#7
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914 Wizard Group: Members Posts: 11,333 Joined: 12-September 04 Member No.: 2,744 Region Association: NineFourteenerVille
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The support strap needs the hole slotted so it can move away , If you insist on a 13mm hex.. and your studs short..
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| Superhawk996 |
Aug 20 2026, 01:16 PM
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#8
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914 Guru Group: Members Posts: 8,000 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch
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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 |
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2 Members: sixnotfour, Rusty
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