Quick Rb25DET help Needed Please...Oil Prob..

[johnny butt]

So I go out today to start my car up to let it warm up and idle and make sure it's doing fine.

I noticed after about 30 seconds I had a nice puddle of oil collecting underneath my car. I spot the culprit and notice the wires are no longer attached to this, and I am thinking it is my oil-temperature sensor. It only drains (spews) out when the car is on.

Any ideas on how to fix or why oil would be leaking from this spot? (too loose?)



This is from under the car, behind the front passenger wheel. It is located right next to the oil filter and I can't really get a good line of sight from the engine bay.

I had already planned to do an oil change (in fact that's what I was preparing to do...) but I'm not about to start loading it up with royal purple if all it's gonna do is send it to the ground / oil collecting tub.

[johnny butt]

Sorry for sounding impatient but I had somewhere I was supposed to be at 4:30 (now 6:30).

I know it's attached to the oil sending unit, and I am going to drain all of the oil so I won't be able to troubleshoot and see if it's still leaking oil. I'd just like to know why all of the sudden oil is spewing out of an electrical plug/sensor and how to fix it.

It looks like there is a brass fitting, but no real way to tighten it other than with pliers.

[Sil240]

Take it off, put some plumbing tape on it then re tighten it. Replug it in.

[johnny butt]

Take it off, put some plumbing tape on it then re tighten it. Replug it in.

Take it off how? It looks like the sensor + plug were crimped on with some type of brass fitting. I have the PVC Tape, that's not a problem, I just didn't see how to take it off without damaging anything in the limited amount of space i've got.

edit, nvm, it looks to be a nut, but anyone know what size? It's at least bigger than the metric equivalent of 3/4.

[USMCgetsome]

get a closer shot! that is not the average oil pressure sensor. got a strap wrench?

[johnny butt]

get a closer shot! that is not the average oil pressure sensor. got a strap wrench?

getting a closer shot now. It is attached to the oil sending unit.



it is still dripping out oil and I haven't put any new oil in it yet, but I've drained it from the oil pan and put a new filter on.

[USMCgetsome]

ok that is the stock sending unit. I think i took it off with a 14 or 12 metric wrench. You should see some wrench flat edges to take it off(look at the bottom where it mates to the oil cooler unit). Strange place to leak. Normally doesn't happen. get it off and let me know hell you can call me if your interested!

[johnny butt]

ok that is the stock sending unit. I think i took it off with a 14 or 12 metric wrench. You should see some wrench flat edges to take it off(look at the bottom where it mates to the oil cooler unit). Strange place to leak. Normally doesn't happen. get it off and let me know hell you can call me if your interested!

WTF? 12 or 14 metric wrench? Care to circle which part would come off with a 12 or 14 mm wrench?

The only thing that looks that small is the plastic piece, and I am not about to start tugging on that and break it.

The piece that looks like a nut is at least bigger than 3/4.

[USMCgetsome]

for sure put that whit tape sealer and also get some rtv or a gasket for that oil cooler unit when you reinstall it.

[USMCgetsome]

hold need to do an ms paint for ya!

[Sil240]

Oh sorry I thought you were talking about the the oil pressure switch/sensor. I dunno if the 25 one is the same as the 20.

The oil switch looks like a brass cylinder with a screw on one end with a hole in it and a connector on the other end.

[johnny butt]

the red part is the only thing that looks like a nut.

The blue part is the plastic piece where the sensor plugged into and oil is shooting out of there when the car is on. It sucks, because it destroyed the wiring attached to it, so after I fix the leak, I also have to figure out how to put a new wire inside the plug for the sensor.

[USMCgetsome]

its under the circled red part that you have illustrated

[johnny butt]

its under the circled red part that you have illustrated

You mean behind this red part?

[USMCgetsome]

directly underneath that on the sensor at the base of it where it mounts to the oil cooler unit. It looks like a small nut 12/14 that's how you spin that mofo off!!!! do it!!

i'll be back in an hour i'm off to the gym. feel free to call me 210 837 1670 mario.
Modified by KUILLIN_DRIFTER at 3:00 PM 1/10/2009

[fast_s14]

if it is leaking from under neath the blue part, you will have to replace the sending unit.

[fast_s14]

to get the sending unit out you can use a pair of pliers or the best thing to use a 12 point socket that fits. Im not sure what size will work but i am thinking around a 30mm or 1 1/8 should get it.

[johnny butt]

if it is leaking from under neath the blue part, you will have to replace the sending unit.

it's sending it out where the plug is usually plugged into. Any parts or part #s so I can get a different sending unit?

So should I just not even fill it back with oil and set it aside for a while until I can get in a better position to remove it?

It feels as if i'm rounding the bolt off with this adjustable wrench because it is NOT moving at ALL.
Modified by johnny butt at 6:38 PM 1/9/2009

[Carl H]

looks like some one replace the stock sending unit with a ka sensor, while this isnt bad they might have crossthreaded it and that is causing the leak...it could also be a bad aftermarket part from the get go.best bet is to pull it out and replace it with a brand new switch from nissan.

[johnny butt]

looks like some one replace the stock sending unit with a ka sensor, while this isnt bad they might have crossthreaded it and that is causing the leak...it could also be a bad aftermarket part from the get go.best bet is to pull it out and replace it with a brand new switch from nissan.

I'll have to put it up on jackstands next chance I get to remove the old one. Anyone have a good part # I can use instead so I can go ahead and get it ordered and added of my list of things to do while she's up on jackstands?

[drifter92sx]

yea thats wat i did wit my rb20 swap cuz i didnt want to wire up the oil pressure sensor yet but the ka oil sensor will work and the threads r the samejust remember to wrap around the threads the plumbers tape for good sealing and wont have problems with it leaking latr

[johnny butt]

yea thats wat i did wit my rb20 swap cuz i didnt want to wire up the oil pressure sensor yet but the ka oil sensor will work and the threads r the samejust remember to wrap around the threads the plumbers tape for good sealing and wont have problems with it leaking latr

So is this the part I need to pick up at autozone/oreillys?

"Ka Oil Pressure Sensor?"

Either way, if that's what that sensor does, I have an Autometer gauge I have been meaning to hook up and get a sensor for anyway. Will me doing that solve the problem?

[gawdzilla]

So is this the part I need to pick up at autozone/oreillys?

"Ka Oil Pressure Sensor?"

Either way, if that's what that sensor does, I have an Autometer gauge I have been meaning to hook up and get a sensor for anyway. Will me doing that solve the problem?

yes but you need to run a 1/8 bspt die on your autometer sender to cut it down so it will thread into there

[USMCgetsome]

did you get it off yet or what? lol!!!

[johnny butt]

did you get it off yet or what? lol!!!

no, my hydraulic jack broke the one time I needed to use it so I've got to take it back and get another,

I have the car sitting on 2x4s right now on the wheels. As soon as I can get a jack, I'll put it up on jackstands and take off the wheels so I can get a better angle.

[Coolwhip]

yea as mentioned before, looks like a cross threaded KA sensor in there if it's leaking.

Brad, i'll check exactly what size is for everything under that as I have both sensors and housings laying around.

[johnny butt]

yea as mentioned before, looks like a cross threaded KA sensor in there if it's leaking.

Brad, i'll check exactly what size is for everything under that as I have both sensors and housings laying around.

thanks, let me know! here or via e-mail (i also e-mailed you. )

If I can get everything sorted out, I may pick it up. I have a friend trying to convince me to hook up the Oil Pressure gauge I have just sitting in a pod in my cluster though, so I'm not sure what route I want to do. I really just want to fix the leak.

[johnny butt]

yes but you need to run a 1/8 bspt die on your autometer sender to cut it down so it will thread into there

This looks like the unit on my car now. Cross-referenced to a KA24DE Sender (Probably kept for the dummy light for the gauge cluster.)

http://store.summitracing.com/...w=sku



I want to get one for my Autometer gauge that reads up to 100 PSI. I have been looking at this one:

http://store.summitracing.com/...00442



Will the threading on that be right to install? It comes with some adapters but I don't think it said what they were.

To stop the leak, I should just install this with some PVC / pipe thread tape, right?

Also, I should just have to wire that up to the autometer gauge, and wire the gauge up to a power source to get an accurate oil pressure reading?

Also, while I am at it, I might as well hook up my Water temp gauge as well. Any one have any specs on the threading or what I should look for for the Temperature sensor/sender for the RB25DET?

Thanks for the help.

[nyc240sx]

get the water temp adapter from ebay i think its a 36mm for the rb25det and then you can hook up a autometer water temp gauge to it