What thread is the water temp probe in the cylinder head???
Turbo Mini Forums

Hey guys,
Does anyone know what the thread is for the water temp probe/stat thingy thats in the front of the cylinder head just below the thermostat housing?

Cheers in advance guys

i dont know for sure, but did know at one point as had an adapter made up for a modern guage

ill have a wild stab in the dark at 5/8 bsp?

"Turbo's make torque, and torque makes fun"

"did you know you can toast potato waffles?"

5/8 BSP - that would be huge!

5/8 UNF, only know cos I recently bought an adapter for it.

brilliant! so i think my auto meter gauge has a 3/8" NPT thread on it..

Do you know where about i could get a adapter thats 5/8UNF male into a 3/8NPT female??

P.S. that bmw looks shit hot

As above ^^^ 5/8" UNF

I've had to re-drill and tap a hose adapter to 5/8" UNF as I've sleeved the one in the head down to M12 X 1.5 for the ECU sender and the sleeve I made was also 5/8" UNF.

Schrödinger's cat - so which one am I ???

Check the auto meter sendor thread. My autogauge had an 1/8 NPT and so do quite few sendors i think.

These are the guys who make the adaptor I have. I bought mine from Demon Tweeks but took ages to get the right one off them. Im sure other people sell them though or maybe go direct.

http://www.lmaperformance.com/Products/products.html

Cheers, they are ace machines.

On 7th Jun, 2010 MiniVanMan said:
brilliant! so i think my auto meter gauge has a 3/8" NPT thread on it..

Do you know where about i could get a adapter thats 5/8UNF male into a 3/8NPT female??

P.S. that bmw looks shit hot

Edited by hammoj28turbo on 7th Jun, 2010.

merlin motor sport do a 5/8UNF temp sensor that will do either oil or water. Costs about a tenner. probably easier the messing about with adaptors.

Schrödinger's cat - so which one am I ???

or...

http://www.merlinmotorsport.co.uk/p4170/RA...oduct_info.html

Is it ok to use other senders for your gauge? Would it not give a wrong reading?

The odd thing about the A series temperature sensor is that it is a parallel thread and seals on a taper at the base of the hole.

So your adapter needs to have the taper. Otherwise you end up with loads of PTFE tape like me.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

or you could use a dowty washer?

my autometer guages came with the correct adaptor

for my megasquirt temp sensor I just used one of these plumbed in the rad hose:

http://www.revotec.com/catalogue_HoseAdapters.asp

[quote=Rod S,7th Jun, 2010]
If you could buy (or just make) an adapter it would have to be stepped which would put the sender in a dead leg quite some way away from the water flow which would make the readings slow to respond and possibly read low.
quote]


Na my probe is really long (so long in fact that if i put it straight into the block it wouldnt go all the way in)..

Its definatly 3/8"NPT it says it on the instructions i got with the gauge AND when i tried it in the 5/8 hole in the head it was ever so slightly bigger.. Ive just got to get an adapter now i guess

P.S. its a mechanical gauge NOT electronic

http://www.autometer.com/cat_gaugedetail.aspx?gid=2556&sid=3

OK, but if it's a mechanical type is the (long) bulb small enough to go through a 5/8"UNF to 3/8"NPT adapter ???

The 5/8"UNF end of the adapter will have a fairly small bore just to give it enough wall thickness not to break.

Schrödinger's cat - so which one am I ???

the bulb will just go through the 5/8UNF bolt ive already got in the head, JUST..
If it doesnt i rekon it will be so close that a little bit of filing wouldnt hurt :p