Outer Limits 4x4 Board

Hi All,
Does anybody know what size the wading plugs/Bolts are for a 97 Disco TDi 300 & ZF Auto?

It feels like a fine thread, a bit bigger than 1/2" (or is that 12.5mm??)

Oh an idea of length and kind of bolt might be good too please (alloy, brass, mild steel, s/steel, HT etc etc ??)

It fits on the bottom of the bellhousing. Thought I had better "fill the hole" as Im getting into more and more mud.

From memory they are 3/8" bsp.

I havent looked but on a disco but on rangie's the plug is usually screwed into a hole nearby ready for plugging the drain hole ?

1/4" BSP Plug.

I got a couple of brass barbs from Pirtek and ran a length of hose off them up to the engine bay; thats for the bellhousing and auto trans of my 300tdi. 1/4bsp doesn't look right, more like 7/16 according to my ruler....Chris.

1/4" means the pipe size, not the thread size. They are pipe plugs.

http://mdmetric.com/tech/pipecomp.htm
http://mdmetric.com/tech/bsppthreadspecs.htm


Why would you put a hose on a drain fitting and route it UP. How is it going to drain??

Jobs right now ....got my bolts and they are 1/2" x 1" USB. Seems stange as I posted this elsewhere and I got everthing between 1/4"-3/4" from differant people .....but either way my holes are plugged so I can hit the mud and not worry about it to much

Trust me, it is 1/4" BSP.

1/2" UNF will fit as will 1/4" NPT, but they are not the same thread form.

See this chart
http://www.mdmetric.com/tech/tict.htm

1/4" BSP = 13.16mm OD, 19 tpi, whitworth thread form
1/4" NPT = 13.571mm OD, 18 tpi, UN thread form
1/2" UNF = 12.7mm OD, 20 tpi, UN thread form

red90 wrote:Trust me, it is 1/4" BSP.

1/2" UNF will fit as will 1/4" NPT, but they are not the same thread form.

See this chart
http://www.mdmetric.com/tech/tict.htm

1/4" BSP = 13.16mm OD, 19 tpi, whitworth thread form
1/4" NPT = 13.571mm OD, 18 tpi, UN thread form
1/2" UNF = 12.7mm OD, 20 tpi, UN thread form

Ok Ok Mate I trust you

After thinking about what you have said I will get some 1/4" BSP from a local plumping shop if they have any.

I wanted to go for a play in the mud with all this rain we are getting....and just had the shits up and wanted to stop stuffing about and get those hole's filled so now I will need to get the others out

Red, reason for the hose on the barbs is that instead of putting in a plug, and it not draining, with clear hose you can see if theres any fluid there and pluck the hose off if necessary, while still preventing mud etc getting in....Chris.

Red, reason for the hose on the barbs is that instead of putting in a plug, and it not draining, with clear hose you can see if theres any fluid there and pluck the hose off if necessary, while still preventing mud etc getting in....Chris.

red90 wrote:Trust me, it is 1/4" BSP.

1/2" UNF will fit as will 1/4" NPT, but they are not the same thread form.

See this chart
http://www.mdmetric.com/tech/tict.htm

1/4" BSP = 13.16mm OD, 19 tpi, whitworth thread form
1/4" NPT = 13.571mm OD, 18 tpi, UN thread form
1/2" UNF = 12.7mm OD, 20 tpi, UN thread form

Jobs right....after a few trips into town Ive got my plugs.


......but they do fit properly ie no slop in the threads etc perfect fit no cross threading etc....another job out of the way ! Thanks red, was there any dought
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