Does anyone know which thread this is?

[TimJM]

It's the oil gauge pressure feed on a Cerbera - it looks like 5/16 to me but I don't know if it is BSP, UNF or NTP...if any of these.

Can anyone verify the correct size and thread from the pics below?




Thanks,

Edited to provide some accuracy...

Edited by TimJM on Tuesday 10th September 08:08

[TimJM]

I had a good read about measuring pipe last night...

I was doing it wrong. For a male thread you measure the outside diameter and then take of 1/4. So that looks like 6/16 take off 1/4 is 2/16 or 1/8.

Also, it doesn't look like NTP as it isn't tapered. To me it looks more like BSP than UNF as UNF (on the pics I have looked at) looks more spikey.

So - I am going for 1/8 BSP. I will order my gauge and let you know if it was right.

[roseytvr]

Hi Tim

Still making progress then!! I would by a tap and die kit with a gauge for measuring they are fairly cheap and always handy in any restoration.

[TimJM]

roseytvr said:

Hi Tim

Still making progress then!! I would by a tap and die kit with a gauge for measuring they are fairly cheap and always handy in any restoration.

Hi Ian,

I am still making progress. I had a few weeks off it after putting my back out and taking a holiday but now I am back to working on it as much as I can.

After what seems like a lifetime scraping off waxoyl and powdercoat from the rear third of the chassis I decided to tackle some other jobs. The oil pressure gauge is one of them and I want to confirm the gauge is faulty before removing it and sending it for repair. The oil/water gauge on Cerberas are buggers. The water is from a fixed capillary tube sensor than runs to the form the back of the gauge to one of the water pipers in front of the engine. I really don't want to remove the gauge unless I have too.