420a, 16g oil feed install qestion

[l6u9k6e9]

I know this is a 2g nt thread but to most it is most definitely a newbie question, so to save my self SOME bashing i posted in the newbie forum,,,,.

I had a spare engine laying around so i assembled it and took a picture.
My question is you run an oil line from the turbo to where? I know about the return line and the oil pan. As far as the feed tho?! I'm clueless.... help? i attached a picture of the back of the block (apparently its somewhere in the back?! if not ill take a picture of the front just let me know). Also picture 1 will be of the turbo just to make sure i will be attaching the oil feed to the right place. Bare with me i just cant afford mistakes.

 

[rowlex]

get a 3/8" threaded T fitting. It threads into your oil pressure sending unit hole which is on the back of the block, far left side, to the left and below the freeze plug. Looks like a piece of your oil pressure sending unit is still in the hole. anyway run a stainless steel oil feed line to a T that you screw into that hole. the last part of the T should be for your oil pressure sending unit or mech. oil pressure gauge.

 

[92awddsm]

You need to tee the oil feed line from the oil pressure sending unit. If I remember correctly, the pressure sending unit is located on the rear of the block somewhere near the middle. Should be about 2" or so higher than the mating surface of the bed plate.

 

[92awddsm]

get a 3/4" threaded T fitting. It threads into your oil pressure sending unit hole which is on the back of the block, far left side, to the left and below the freeze plug. Looks like a piece of your oil pressure sending unit is still in the hole. anyway run a stainless steel oil feed line to a T that you screw into that hole. the last part of the T should be for your oil pressure sending unit or mech. oil pressure gauge.

My bad, I was thinking it was in the center. Been a while since I have dealt with a 420a.

 

[import1]

its been awhile since i had a 420a, but the feed needs to come from the back of the block. there is a sensor in the back the is down on the middle left. it is the oil pressure sensor. what i did was got a brass T from home depot and T'd it off. one end goes into the block one end gets the sensor and on is for the feed line. i for get what size it was. pretty simple. kind of hard in the engine is still in the car because its hard to reach, but if the engine is out it should be cake good luck.

 

[rowlex]

My bad, I was thinking it was in the center. Been a while since I have dealt with a 420a.

the ONLY reason I know where it is is because the damn thing has been leaking on my g/f's car. I've broken and replaced the damned 90$ sensor twice. The second time I replaced it with a mech. oil pressure gauge tho.

EDIT: My g/f's car is a 95. Maybe the location is different on the 96??

 

[l6u9k6e9]

You all give me too much credit i have no clue what you are talking about ..

Could one of you take the picture that i have posted and circle and label what you are talking about?

 

[SkyLineGtR-R34]

run it from the oil pump
you get fresh filtered oil

 

[l6u9k6e9]

More confusing stuff...

i need a picture...

 

[rowlex]

More confusing stuff...

i need a picture...

Don't listen to the rook. He obviously couldn't tell your working with a 420a motor.

Take a closer/brighter picture of JUST the back of the engine block. Specifically the two things that look like bolts under the far left freeze plug and the center freeze plug.

Take one good picture of each of those I circled in black. Earlier I was on the work computer with a lower resolution screen then my laptop. It appears their is a difference between the oil pressure sending unit on the 95 to 96+ blocks. (My g/f's car is a 95 and the place where her oil pressure sending unit goes is on the left one I circled). It appears (although I still cant be certain cuz the picture isnt detailed enough) that the 96+ may be in the center. I assume tho that oil can still be had from both locations.

EDIT: this tech article should help you A LOT. Post #6 will describe what we are talking about with the oil line T that is needed.
http://www.dsmtuners.com/forums/showthread.php?t=181134

 

[l6u9k6e9]

here are the pictures you asked for

 

[rowlex]

ok, the center one looks like an oil pressure sending unit but I am still curious of the other one.

What is "plugging" the other one I circled? It almost looks like a plug? Or just like the broken oil pressure sending units I broke from my g/f's car. (snapped the plastic piece clean off) inside it was a little plastic window type thing.

What year car is this block from?

 

[l6u9k6e9]

i beleive that it is a 95 block. The other one just looks like a plug,,, not sure for what.. Would either one of those be ok to use?

 

[rowlex]

i beleive that it is a 95 block. The other one just looks like a plug,,, not sure for what.. Would either one of those be ok to use?

I can not say for sure. I have limited experience with the N/T's. If it is a 95 block use the one on the left. Try pushing in on the inside of the plug and taking a good look at it, it looks like their might be some broken plastic on the inside?? Or just built up grease?

On my G/f's car when I broke one of the oil pressure sending units it looked kinda like the picture. But inside it was a little plastic diaphram filled with oil that I could push in/out. Is that one anything like that?

 

[l6u9k6e9]

The black part in the middle of that plug feels like its a sheet of plastic.... it is not solid at all, but it is sealed. So does the fitting run to one of those 2 plugs?! can we at least narrow it down to that?

 

[rowlex]

The black part in the middle of that plug feels like its a sheet of plastic.... it is not solid at all, but it is sealed. So does the fitting run to one of those 2 plugs?! can we at least narrow it down to that?

Ok great then I think infact you do have a 95 block, and that is your broken oil pressure sending unit. THAT is where the oil to feed the turbo was tapped on my girlfriends car, and the same place the vfaq describes. You will either want to replace the oil pressure sending unit (~80ish from mitsu a buddy of mine was able to get one for 40-50$ at autozone). Or replace it with a mechanical/electrical oil pressure gauge. Tap it from the one on the far left that I circled.

 

[DSMcrazy3]

Wow, I have never seen so many 4g owners post in a 420A turbo thread hehe...

Rowlex is right the left one that he circled is where the you will tap for the oil feed line. It's not a 3/4 fitting though it's a 3/8.

Since that sending unit is already broken, I would suggest just buying an autometer electric oil pressure gauge and not bothering with another sending unit(just leave it unplugged), as they just turn on a light after you know something is wrong.

To do an oil pressure gauge, leaving the sending unit out you would just buy a

3/8 Hex nipple
3/8 female tee
3/8 male to 1/4 flared male(for oil line attatchment)
1/4 female to 3/8 male(for oil pressure sending unit attatchment)

That will probably leave you with questions, if so feel free to ask.

 

[rowlex]

Wow, I have never seen so many 4g owners post in a 420A turbo thread hehe...

Rowlex is right the left one that he circled is where the you will tap for the oil feed line. It's not a 3/4 fitting though it's a 3/8.
.

Bout damn time you posted. And a serious DOH to me for saying it was a 3/4, don't know how I got it mixed up.

 

[XMasta19]

the one on the right looks a lot like an oil pressure sending unit to me


forget what all of them say...take out that sensor in the right hole, thread in your 3/8npt tee, put the oil feed on one side and an electric oil pressure gauge on the other.

 

[DSMcrazy3]

the one on the right looks a lot like an oil pressure sending unit to me

It isn't, the oil pressure switch has a long plastic piece, probably an inch longer than the one still in tact. That one you're referring to is the knock sensor.

forget what all of them say...take out that sensor in the right hole, thread in your 3/8npt tee, put the oil feed on one side and an electric oil pressure gauge on the other.

Dis-reguard this..

 

[rowlex]

forget what all of them say...take out that sensor in the right hole, thread in your 3/8npt tee, put the oil feed on one side and an electric oil pressure gauge on the other.

Like DSMCrazy said, dis-regard this if you would like to supply oil to your turbo. Put the oil feed line on the left one I circled. The sensor that remains (the other one I circled) is your knock sensor.

 

[l6u9k6e9]

The block in the picture is an old block i have laying around it will not be the block that the turbo will be going on. Its all just for fitment and learning. I will be installing this on my RUNNING 99 gs, with a 95 block in it with a built bottom end. So the oil pressure sending unit is good on that one im guessing. Also assuming that it is good do i have to replace it? thats $80, i would much rather spend that on guages or put it towards an safc II or some datalogger. anyone?

 

[DSMcrazy3]

The one in the pic, is broken, on the other block, it is probably fine, but like I said before you really don't need it. Especially if you will have an Oil Pressure Gauge

 

[l6u9k6e9]

What does it do, the stock one i mean,,

(just leave it unplugged), as they just turn on a light after you know something is wrong.

is that all it does?

 

[dr1665]

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I can't believe I didn't see this thread today while I was at work. I could have saved you a LOT of time. This is my set up. I built it to accommodate a future turbo feed line back when I had GT35R plans. Since the car will never be turbocharged now, this is kinda of overkill and I will be reducing it when I pull the head again next month. You can see the capped end (where the feed line would go) on the left, and the OPSU on the right.

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All the stock OPSU does is activate the dummy light in the dashboard on a 2GNT. Nothing more. The OPSU in this picture is the one for my electronic oil pressure gauge in the cabin. It has one wire that runs to the gauge. That's it. The knock sensor (meager as it is) is the one in the center, and the crank angle sensor (CAS) is the one that bolts up by the oil filter. OiL on the Left. CRank on the Right.

And this picture is just amusing to share in this thread.

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