Patrick Jones

Can't see where it's coming from 5.3 Vortec.

Utinator

What do you mean by "RH Bank"? Are you talking about the heads? Can you see oil dripping?

Patrick Jones

I dont know were it's comming from,it ante no dripp it's poreing out about 30 seconds after start up.cant see were it starts but it's not from bellhousing - it's on the block above starter.

LLLosingit

iTrader: (4)

Check the oil pressure sensor, It on the top of the engine at the back of the intake, Oil is probably running down the side of the engine.

Patrick Jones

I have replaced valve cover,valley pan,Intake manifold gaskets, oil press sending unit is dry,cam positioning sensor dry,did the crankshaft positioning sensor right after this problem began.lv used a borascope camera,not enough pixels i guess.

RB04Av

Most likely oil pressure sensor.

Don't worry about "dry"; just swap it out.

Darth_V8r

iTrader: (4)

Passenger side above starter can be one of a few things.

Crank position sensor is most likely as its right there.
Cam position sensor next most likely. Its on top of block passenger side.
If you are really unlucky, you hydrod a head bolt hole and cracked it on cylinder 8. It will leak on the engine rear and then run out by the starter. Ask how I know...

Che70velle

iTrader: (6)

I had a hairline crack in a dipstick tube make me pull my hair out once, and I’m bald.

LLLosingit

iTrader: (4)

Would the cam sensor even see any kind of pressure? I can't imagine it would leak much if it didn't have pressurized oil. He did say it was pouring out after 30 seconds of run time.

Utinator

It could be the rear main housing. If it's leaking at the 12 O'clock position, it will run down the side of the block. I hope it's not that.

Justin Palmese

Check the oil pressure sender behind intake manifold

G Atsma

Previously mentioned...

Darth_V8r

iTrader: (4)

Opsu leaks down the driver side and looks like it is above the filter. This Leak is behind the starter.

dixiebandit69

I'm going to second the rear cover as the source of the leak. It has pressurized oil behind it.

I remember a couple of years ago, a guy brought an LS4 Impala into the shop, and wanted a couple of gaskets replaced ( valve cover and oil pan), but the engine had seeps of oil coming from EVERYWHERE.
My recommendation was to pull the engine and reseal the whole thing, but he didn't want to do it.
Well, after changing the valve cover and oil pan gaskets, it still had a steady drip from the back of the engine.
It was the rear cover. We had to pull the transmission out to change it (he still refused to pay for pulling the engine), and afterwards he was still unhappy because there was leakage from the timing cover.

What is that saying? You can lead a horse to water...

Utinator

How would you know if this has happened? Is there any way to check without removing the heads?

Darth_V8r

iTrader: (4)

I found it when I pulled the rear cover. Piece of the block fell off. Was the top rear cylinder 8 bolt hole.

How to make a coffee table, step 1... :Nono:

Utinator

Oh my...that's terrible. I hope that doesn't happen often. I also, have some oil on the starter. It's not pouring out though. I also have oil on the driver's side hanging from the oil filter. None of my oil leaks are actually dripping though. I just have some wet spots. I think most of my oil loss is internal. I still haven't figured out where it's all going.

Darth_V8r

iTrader: (4)

Here is the crack location. It extended into the gasket surface for the rear cover

kott0n

You can pop off the inspection cover on the trans and look at the flex plate. Usually if its leaking from the rear main the trans bellhousing will have fluid in it, the flex plate will be wet also.

I have this same issue I'm working through right now. I replaced a few things that needed done anyways before I looked in the inspection cover and saw what I dreaded, leaking rear main.

I need a new trans anyways so Ill fix it when I pull the dead one.

Patrick Jones

I realy like the#8 cylinder headbolt answer!very good lead,very bad for me if that's it,WOW