[meanmudder]

Can anybody tell me what this is ,what it's for ,why would oil poor out from it when engine is running

Thanks and Merry Christmas

 

[Squid63]

If that's a turbo engine, that grommet seals the turbo oil drain line to the valley.

 

[meanmudder]

this one is not a turbo but I'm swapping the ats off the old and putting it on.should it be plugged?It was the original with the ats that oil was pouring out of that hole and I blocked it off so should it be blocked or open? and the orignal had a line from the turbo to the rear of the crankcase next to the oil filter

 

[chuckster57]

On the factory turbo set up the turbo "pedestal" bolts to the engine and part of the pedestal is the drain for the oil return from the tubo bearings. If you are putting on the turbo then it will have to be "open" as the pedestal will set in the hole and seal the grommet. If you go to the pic link in my sig for the turbo upgrade I have a picture that explains the oil path. The pedestal has two bolts where the cdr (?) is bolted just behind the intake screen.

 

[meanmudder]

i know abot the grommet for the pedestal this plug (it's threaded and can be taken out with a 3/8 ratchet ) is right behind that here is another pic

 

[Squid63]

I was wrong. It looked like the grommet from the first angle, but clearly it isn't. I'd say it's gotta be an oil pressure galley under that, so maybe try to remove it and see if it is loose, or if there are any cracks in either the plug or the block. Is that the port for the supply line to the turbo? It's been a while since I've looked at the back of my IDI.

 

[meanmudder]

TTT for the morning guys,I would like to know what to do with this before I lower the engine in the truck

 

[chuckster57]

Like squid said...It is clearly NOT the turbo pedestal grommet. It's not the supply for the oil to the turbo. I will take a look at my truck when it gets light out and see if I can see anything. IIRC when I did my turbo upgrade I didn't see anything like that second hole and plug. How hard would it be to get a new valley pan gasket ? I wonder if the PO had a hole and just installed a "plug" repair

 

[meanmudder]

That plug is in the original engine as well as this one that I am putting in but theoriginal engine with shoot out 2 quarts of oil in one block of driving and it was a P.I.T.A. to disassemble the turbo while in the truck so I would like to know about tthis plug before I hook everything up.
Changing original engine because of a knock that has been there since I got the truck ,loosing more and more power, bad oil cooler I think (water in crankcase, oil in radiator) its right after I changed the oil cooler o-rings when it started pumping oil out of that hole so i plugged it ,maybe theres more problems then the oil cooler

 

[chuckster57]

Here is a picture

I read in my repair manual and it does reference it as a CDR tube grommet. I went and took a picture as best I could and I do have the grommet but you can see a metal "plug" in the grommet. I didn't see the metal plug in your pictures. it may be sitting in the lifter valley :shrug03:

 

[arthurgoboom]

I am 98% positive that what I'm about to say is true: That plug just holds down the valley pan in the rear. It uses a 3/8" ratchet drive to remove it, and the square in the middle passes all the way through to allow water and other stuff that finds its way on top of the valley pan to drain away. It actually drains to the outside of the engine block, not down into the valley. This is where the fuel goes if you get a leak from the IP body and you suddenly have a puddle of fuel towards the back of the engine.

The CDR valve/turbo return hole & grommet is the separate hole just in front of the threaded plug.

To verify this you might take and blow some compressed air through the square drive hole and make sure that the passage is open and that it does indeed vent to the outside of the engine.

 

[chuckster57]

I Just Had To Know For Myself:

I am 98% positive that what I'm about to say is true: That plug just holds down the valley pan in the rear. It uses a 3/8" ratchet drive to remove it, and the square in the middle passes all the way through to allow water and other stuff that finds its way on top of the valley pan to drain away. It actually drains to the outside of the engine block, not down into the valley. This is where the fuel goes if you get a leak from the IP body and you suddenly have a puddle of fuel towards the back of the engine.

The CDR valve/turbo return hole & grommet is the separate hole just in front of the threaded plug.

To verify this you might take and blow some compressed air through the square drive hole and make sure that the passage is open and that it does indeed vent to the outside of the engine.

yeah your right. It does "pass through" some where and it is an open passage. I had to drag air hose and drop light across the driveway but it was worth it for the knowledge I gained. When I used about 30 PSI air I felt the air behind the intake and lower than the valley pan gasket. It sure is hard when it's in the truck though. I still am wondering if maybe it isn't missing on Meanmudders motors ?

on edit: I looked at his pictures again and I am now wondring if maybe the "plug" isn't cracked or leaking around the grommet.

 

[WhiteGardens]

I've been watching this thread, and I've got a question about the oil that had been leaking out of this plug.

Why would there be oil under pressure coming out of this plug if it's for drain purposes?? Could it be due to the original issues he has with the old motor?? (water in the oil, etc..)

 

[ned37]

have you considered the possibility that the cdr rubber downtube is cracked and spitting oil on the fitting?

 

[meanmudder]

I've been watching this thread, and I've got a question about the oil that had been leaking out of this plug.

Why would there be oil under pressure coming out of this plug if it's for drain purposes?? Could it be due to the original issues he has with the old motor?? (water in the oil, etc..)

This is what I can't figure out, the oil was definetly coming from the square hole (i used a light and mirror) the oil was shooting at least 3"s straight up at idle

 

[cdnsarguy]

The metal plug with the 3/8 hole is the rear valley pan hold down and the drain hole for liquid collecting in the valley pan. It drains out there to the upper rear of the engine block by the oil sender. The plastic/rubber CDR tube should go to the other hole.

Unless there is a cracked VP around that plug there should be no oil coming from it.... is the plug tight.....

I have seen cracked valley pans before in the corners but not at that plug....... a first for everything.