Defi oil temp sensor doesn't fit. What thread pitch is the OEM oil temp sensor?

**Bruizer** · 05-31-2011, 07:18 PM

For sure not 1/8BSPT or NPT. Thought it was M12 x 1.5 but it's not either, close but not quite. What the heck could it be? Just need some kind of adapter. Defi says nothing.....

I wouldn't think it's M10 cause M12 does fit a few thread but looking closely, there's slitgly more threads on whatever the OEM oil sensor is... Thanks

**cortexx** · 05-31-2011, 09:26 PM

I dont know what the thread is , but the defi oil pressure and temp sensors i have fit fine in a grex remote oil filter block if that helps

**archaeic_bloke** · 05-31-2011, 10:56 PM

are you sure you're not trying to thread the oil pressure sensor into the oil temp hole? or vice versa??

if not... then I hate to suggest this, but you may have knock-off Defi units... where did u buy them from?

The proof and reason why I suggest this is my own engine... heres a picture of both defi oil temp and pressure sensors installed in my RB26 block in the stock oem location for both. the larger one, with a metal cylinder and sitting perpendicular to the oil filter is the pressure sensor, the small brass thing right beside the filter is the temp sensor

**Bruizer** · 05-31-2011, 11:47 PM

I spend nearly $2000 on defi so theyre legit.

As for oil pressure that is 1/8bspt or npt which is fine but the oem oil temp sensor is actually M12x1.25 which I confirmed after posting this which is the case in the oem location and my hks filter relocation block. The defi sensors are ONLY 1/8npt or 1/8pt (bspt).
Your picture shows 2 defi sensors 1 temp 1 press transducer. However the temp sensor you're showing me is not in the oem location (looks like someone tapped in in next to the press trans reciever) which explains why yours fit. The oem sensor is to the right and behind the filter if I recall. Did you install those or did a shop do it?

So. Really I need a 1/8npt female to M12x1.25 male adapter... My M12x1.5 isn't quiet fitting

**Bruizer** · 06-01-2011, 10:05 AM

Originally Posted by cortexx

I dont know what the thread is , but the defi oil pressure and temp sensors i have fit fine in a grex remote oil filter block if that helps

Grex>hks I guess haha. The hks only has 2 ports (1/8npt which is my oil Pressure now and m12x1.25 which is oem oil temp) the defi sensor is much longer than oem too so I can't just tap it in anywhere, that and unlike the picture, I dOnt have an oem oil cooler

worse case I'll Jimmy up more fancy AN stuff...

**archaeic_bloke** · 06-01-2011, 01:58 PM

Originally Posted by Bruizer

I spend nearly $2000 on defi so theyre legit.

As for oil pressure that is 1/8bspt or npt which is fine but the oem oil temp sensor is actually M12x1.25 which I confirmed after posting this which is the case in the oem location and my hks filter relocation block. The defi sensors are ONLY 1/8npt or 1/8pt (bspt).
Your picture shows 2 defi sensors 1 temp 1 press transducer. However the temp sensor you're showing me is not in the oem location (looks like someone tapped in in next to the press trans reciever) which explains why yours fit. The oem sensor is to the right and behind the filter if I recall. Did you install those or did a shop do it?

So. Really I need a 1/8npt female to M12x1.25 male adapter... My M12x1.5 isn't quiet fitting

you're right actually, I remember the oem pressure sensor is on the other side, my bad! a shop installed these for me. maybe you can do the same?

**Bruizer** · 06-01-2011, 10:41 PM

Originally Posted by archaeic_bloke

you're right actually, I remember the oem pressure sensor is on the other side, my bad! a shop installed these for me. maybe you can do the same?

Np. As for tapping a new hole there is no where. The hks sandwich plate only has 1 boss which is 12x1.25 and the filter block has a 1/8npt (for oil pressure) and a 12x1.25. Im trying a dye on my 12x1.5 adapter tonight and worse case I'll block out the hole to M14x1.5 or 1.25 if the housing is big enough. I know I can get those adapters