Oil pressure sensor

[kavadarci]

Hi,
Since I am fixing the triangle of death, one of the items to replace is the oil pressure sensor with wire attached to it.
I checked few places and all had the same one which I ordered.
After receiving the part I found mine is much larger in the thread area.

Can someone help me identify the correct part number?
Here is a photo with the difference.

[Dmitry at Pelican Parts]

Give us a call at 888-280-7799 and ask for one of our Porsche part specialists; they'll be able to confirm the correct part number for you.

[KTL]

The threads for the oil pressure warning light switch are M10x1.0 That's the same threads as brake line tube nuts, so if you have an old brake line you can compare it that way.

The part number for the oil pressure switch is 911.606.230.00

[john walker's workshop]

Those two are the same thread. Maybe you took the adapter fitting off with the switch.

[kavadarci]

Is there an adapter?
Everything just came off and I cleaned the sensor. I didn’t see an adapter.
The thred and opening to the engine case is without a doubt in my mind bigger than them he new sensor.
Maybe there was an adapter at one time.


I can take it out again I guess.

[Trackrash]

That is actually the oil pressure warning switch. And yes it threads into an adapter.

MAKE SURE the threads are EXACTLY the same on your old and new units.

Some of the replacements have pipe threads that are very similar to the 10 mm threads that it should have, but will not be correct and leak. AHIK.

[kavadarci]

Ok so I don’t have an adapter then.

[Flat6pac]

The adaptor is in your picture.
Bruce

[kavadarci]

The one on the right is the one that is currently bolted into the engine case.
The one on the left is what I just received.
If I take the right out the left thread diameter is so tiny that will just sink in.

Not sure if I’m missing something here.

[fanaudical]

I believe the one on the right is already screwed into an adapter - please see snapshot from the PET below:

[boyt911sc]

Originally Posted by kavadarci

The one on the right is the one that is currently bolted into the engine case.
The one on the left is what I just received.
If I take the right out the left thread diameter is so tiny that will just sink in.

Not sure if I’m missing something here.

Kava,

Separate the old pressure switch from the adaptor. You just removed the pressure switch with the adaptor.attached to it. And you have the correct pressure switch.





Tony

[kavadarci]

��
This dummy finally got it.
Thank you so much.
I will do that.

[KTL]

Originally Posted by Trackrash

MAKE SURE the threads are EXACTLY the same on your old and new units.

Some of the replacements have pipe threads that are very similar to the 10 mm threads that it should have, but will not be correct and leak. AHIK.

Gordon makes a good point about these threads. For anyone doing a search in the future about thread size and happens across this thread, M10x1.0 and 1/8 inch-27 threads per inch National Pipe Thread (NPT) threads are so very very close in size that you can EASILY mistake one for the other.

The proper switch should be M10x1.0 and needs a tiny aluminum sealing ring to keep it from leaking. It's not a thread interference seal like NPT threads. To prevent oil leakage the switch needs the sealing ring in place to squish between the switch body and the top of the adapter

[GH85Carrera]

Originally Posted by KTL

Gordon makes a good point about these threads. For anyone doing a search in the future about thread size and happens across this thread, M10x1.0 and 1/8 inch-27 threads per inch National Pipe Thread (NPT) threads are so very very close in size that you can EASILY mistake one for the other.

The proper switch should be M10x1.0 and needs a tiny aluminum sealing ring to keep it from leaking. It's not a thread interference seal like NPT threads. To prevent oil leakage the switch needs the sealing ring in place to squish between the switch body and the top of the adapter

And then they still seem leak! One reason they get replaced anytime work is done in the triangle of death.

[KTL]

Yeah gotta "love" the irony of that. But I think they leak at the plastic-metal crimp joint and not at the threads. Good reason to put a swipe of epoxy around the crimp joint (just like Tony's picture shows for three of the four switches in the top row) when reinstalling a switch

[gazzerr]

Look up the torque value for your car for the switch. It's not much. You definitely do not want to over tighten it.

[KTL]

Spec book say 20 Nm = 15 lb-ft. A bit less than a typical 13mm (M8) nut torque. Just make it nice and snug to squish the sealing washer

[kavadarci]

Got it
I will add epoxy as shown, honestly I didn’t notice epoxy until point it.
Great idea ��

[boyt911sc]

Originally Posted by kavadarci

Got it
I will add epoxy as shown, honestly I didn’t notice epoxy until point it.
Great idea ��

Kava,

I just finished the 4th group for the Engine Rebuilding Classes today and one of the things I discussed with the participants was to apply some epoxy bead on top of the oil pressure to prevent unwanted oil leak. My 78 SC had one installed more than 20 years ago and still no sign of oil leak on top of the motor.

Tony

[kavadarci]

Thank you.
Did apply epoxy and job done.