OBX headers...what is this tube for?

[zr1assassin]

What is this tube for? It's on one of the headers...

https://ibb.co/m42oEn

[Ccmano]

What is this tube for? It's on one of the headers...

https://ibb.co/m42oEn

EGR... had the same question when I did mine.... cap it off if your does not have EGR.
H
:cheers:

[zr1assassin]

EGR... had the same question when I did mine.... cap it off if your does not have EGR.
H
:cheers:

Exactly what I was looking for😉 thanks!
You don't by chance remember the cap/thread size do you?

[Vette73]

My mechanic crushed mine than welded.....

Sent from my LG-TP260 using ZR-1 Net Registry mobile app (http://r.tapatalk.com/byo?rid=90383)

[zr1assassin]

My mechanic crushed mine than welded.....

Sent from my LG-TP260 using ZR-1 Net Registry mobile app (http://r.tapatalk.com/byo?rid=90383)

Lol.... I guess that would work to

[Ccmano]

Exactly what I was looking for😉 thanks!
You don't by chance remember the cap/thread size do you?

14mm freeze plug. Hard to find. Got it here... added a couple spot welds to keep it in place.

Autohausaz.com

Genuine MercedesExpansion Plug; 14mm OD Freeze Plug
SKU: 11095595-000000004054
P/N: 000000004054
2x$1.88

H
:cheers:

[RussMcB]

14mm freeze plug. Hard to find. Got it here... added a couple spot welds to keep it in place.

Autohausaz.com

Genuine MercedesExpansion Plug; 14mm OD Freeze Plug
SKU: 11095595-000000004054
P/N: 000000004054
2x$1.88

H
:cheers:That's a little nicer than my solution. I used a 14mm bolt (not fully threaded).

[zr1assassin]

14mm freeze plug. Hard to find. Got it here... added a couple spot welds to keep it in place.

Autohausaz.com

Genuine MercedesExpansion Plug; 14mm OD Freeze Plug
SKU: 11095595-000000004054
P/N: 000000004054
2x$1.88

H
:cheers:

Thanks for the info😉

[WVZR-1]

Why wouldn't you ID the thread and go for a threaded solution?

[zr1assassin]

I actually just ran a tap in it, 9/16-12 works perfectly

[WVZR-1]

i was surprised to see the HEX on the header EGR - all I'd ever seen previously had the connection that required an OE clamp. Was/is the HEX actually 'free spinning' and threaded?

7159 7160

[zr1assassin]

They should sell 2 versions and save themselves time/money putting on at all, think about the numbers of cars 90-92 vs 93-95. They could probably not put it on at all for 80% of them.

[zr1assassin]

i was surprised to see the HEX on the header EGR - all I'd ever seen previously had the connection that required an OE clamp. Was/is the HEX actually 'free spinning' and threaded?

7159 7160

Not free spinning but it is threaded

[RussMcB]

Why wouldn't you ID the thread and go for a threaded solution?Mine had no threads, inside or out. It was just a simple tube. Very odd.

[zr1assassin]

Mine had no threads, inside or out. It was just a simple tube. Very odd.

The threads are on the ID of the coupler, not the tube

[WVZR-1]

Mine had no threads, inside or out. It was just a simple tube. Very odd.

Not ODD at all - yours was a duplication of the OE and for use with '93+ you could with 'no issues'. See the image in post#11. I don't get the OBX thing. Maybe someone with a '93+ w/EGR might mention how they accomplished EGR function retention when using OBX.

Yours is what I'd have expected

The threads are on the ID of the coupler, not the tube

I might have tried to ID the thread and use a mating male fitting of sorts.

I would have thought choosing the option of threading the ID of the tube a better choice could have been made. Your choice works for you so it 'matters NOT'!

[tf95ZR1]

I learned this from Marc Haibeck:
It uses a compression clamp (and special tool)
called a Oetiker clamp. #7 in above drawing.
Look it up!

Found it! Jerry's Gaskets (of course!)

http://www.jerrysgaskets.com/clamp-egr-pipe-to-exh-manifold-new-90-95-2c4/

zr1assassin: If you use the EGR system, its a compression connection
egr to nipple on exhaust. No threads, stock no nut.