TheSamba.com :: View topic

Tue Dec 09, 2025 12:22 pm

Hi Guys

Can someone please provide me with the lengh of the threaded part of the relief valve plug.

I want to swap out the horrible flat screw type with hex Allen key plug

Thank you

If possible please provide measurements in mm

Tue Dec 09, 2025 5:03 pm

if your going to swap it out, do you not have the OE one?
also, CB has some nice Allen ones ... come with new springs and everything

Tue Dec 09, 2025 7:00 pm

BFB wrote: if your going to swap it out, do you not have the OE one?
also, CB has some nice Allen ones ... come with new springs and everything
https://www.cbperformance.com/product-p/1279.htm

Tue Dec 09, 2025 9:49 pm

BFB wrote: if your going to swap it out, do you not have the OE one?
also, CB has some nice Allen ones ... come with new springs and everything

They are sre still in my engine ,I would like to by them before I remove them so its an immediate swap

Shipping from CB is going to take 2 to 3 weeks and will be very expensive to Cape Town

I wont to get them from my local nut and bolt center hence me asking assistance with measurements

Im hoping u guys can help me around this

Yesterday 7:11 am

Threaded portion is 14mm under the 'Hat' that crushes the sealing washer.
18x1.5 thread is what I show.

Yesterday 7:18 am

I have these, I modify stock ones, PM me

Yesterday 7:20 am

you'll play hell trying to find a bolt that short, fat, and fine thread, let alone a local place that stocks it. id bet that if you ordered CB's they'll be there before you can source them elsewhere.

Yesterday 7:26 am

RWK wrote: I have these, I modify stock ones, PM me

Do you modify them using a rotary broach?

Yesterday 7:34 am

I would bet that if you go to a local metal shop they can slice you off a piece of aluminum hex bar about 3/4" long. Go to a local welder and have him heli-arc that to the plug. Then spend a few minutes cleaning it up with a file and sandpaper.

Or....simply drill a hole in the dead center. Tap for 10mm thread. It will be in the center of the spring and cause no issues. Screw in in. Lock time it. Leave only a fe2 threads on the inside and heavily distort them in a vise so it cannot back out. Now you have a 17mm hex on the outside.

Ray

Yesterday 7:36 am

Or...get one of these. The screwdriver tip is 3/4" wide

https://www.zoro.com/proto-12-in-drive-34-sae-sock...BgQAvD_BwE

There are two Stanley-Proto dealers in Cape Town

1. Rs components
https://za.rs-online.com/web/b/stanley-proto/

2. Tooling promotions

You can probably also get it on Amazon ....found it here

https://www.amazon.com/s?k=stanley+proto+j5444a

Ray

Yesterday 7:53 am

RickS wrote: RWK wrote: I have these, I modify stock ones, PM me

Do you modify them using a rotary broach?
EDM, I'm a tool/moldmaker, so do them when not busy with real work, make the edm tool or electrode, drill the plug to just under 6mm then set several up in machine. program it and push go, then go do something else.
saves old messed up plugs that are otherwise good.

Yesterday 8:21 am

I once forgot to install the oil bypass after I installed the deep sump.

Easy solution.

Or get the right tool which is a Drag Link and not a screwdriver.

Yesterday 8:43 am

The four plugs (on my two VWs) are still the original slot type; I have no idea why VW designed them this way. When I rebuilt the engines, I didn't bother to buy aftermarket plugs to make this easier.

However, when I first saw this thread, I figured one could weld a bolt head onto an existing plug, like Glenn has done. I think that's a great idea. I do understand that some of us - me included - do not weld.

Yesterday 1:47 pm

Drag Link Socket; https://www.core77.com/posts/24121/Tool-Terminolog...driver-Bit

https://handwiki.org/wiki/Engineering:Drag_link

https://forums.yesterdaystractors.com/threads/drag-link-socket.1527291/

Yesterday 1:56 pm

Dougy Dee wrote: Threaded portion is 14mm under the 'Hat' that crushes the sealing washer.
18x1.5 thread is what I show.
Thank you for the reading comprehension and understanding the OP's question and situation.
:thumbsup:

Yesterday 7:54 pm

I THINK 18 x 1.5 is the same as an O2 sensor. OP, i dont know where your at but i can buy O2 sensor plugs at my local Oreillys auto parts store.

Yesterday 9:32 pm

m18 x 1.5 is indeed the thread most O2 sensors use. So yes, an O2 bung plug could work. But then there’s the spring seat depth problem.

That said, welding or maybe even brazing is not so mystical a skill as to have limited access to those who can do it.

If the OP can get the shitty slotted plug(s) out, there’s nothing wrong with welding (or perhaps brazing, if it’ll take the torque) a thin nut to the plug so it can be put back in without removing the deep sump.

I have no idea what resources the OP has at his disposal. But, as usual, the simpler the better.

My opinion. For whatever it’s worth…