Lost oil pressure

Cliff · Feb 6, 2017

Got a 2009 GTI 2.0 TSI CCTA
Lost oil pressure thought it was bearings so we had lower end rebuilt with bearings and rings. Has pressure until it warms up and drops to 0 psi after warm. Has updated tensioner on it. Car only has 100,000 miles on it. Could it be in the head, maybe crack?

Uwe · Feb 6, 2017

Moving to General VW/Audi Repair...

-Uwe-

Jack@European_Parts · Feb 6, 2017

Was the oil pump and oil filter housing with PSI control changed when rebuilding the low end?

Cliff · Feb 6, 2017

Tried 2 different (new)oil pumps and no the filter housing was not.
We also took the oil pressure fitting off where its connected to motor and blew air threw it. You can hear alot of air blowing out somewhere in the head under the cover where the camshafts are. We have also tried new electronic gauge and tried a mechanical gauge also. We accidentally left the fitting out where the sending unit goes and started car and it shot oil about 5 feet across garage. Only ran for about 2 seconds like that. We have the front end off to get easy access to everything. So we know we are getting oil to the sending unit. But somewhere after that its not creating any back pressure to show oil pressure. My question is, what after that could it be? somewhere if head? could it be a cam tower worn out?

NZDubNurd · Feb 7, 2017

What oil grade are you running? What is the cold pressure at idle?

Jack might know (by the sounds of his question), but is the pressure sensor BEFORE the high pressure releif valve?

If it's stuck open, you won't get much oil pressure, especially as the oil thins out. It's part of the filter housing. If you had really thick oil (50W-70!!!) the releif valve is supposed to limit the max pressure by dumping the excess.

It has to be a MIGHTY big leak for you to get "0" pressure - any kind of restrictive crack or orifice will cause at least some pressure, unless it opens up pretty wide, from a major artery.

Cliff · Feb 7, 2017

Its my sons car. I believe he said 5w30. Pressure cold at idle is at about 40. Is the pressure relief valve something that can be clean or replaced? Is there any pictures of this relief valve?

Cliff · Feb 7, 2017

There is not a pressure relief valve in the filter housing that we can find.

NZDubNurd · Feb 8, 2017

Sorry - I don't know where it is on your motor - a workshop manual, or maybe Erwin???

On previous models, like the 1.8T, it was in the side of the filter housing, and could get clogged up, or loose pressure holding ability sometimes. It just looked like a bolt head, but it hald in a plunger and a spring - much like the old airkewled ones had in the bottom of the case.

I would suspect the pump has one, but that the filter housing likely has one too, to help revent black, grubby explosions when someone canes it, with thick, cold oil.

Cliff · Feb 8, 2017

We have filter housing off. We have a manual and neither off the show a relief valve of any sort.

Cliff · Feb 8, 2017

Talked to a VW repair shop today here in MPLS. He couldn't think of anything either. We talked about oil filters. Think maybe a after market filter could be the problem? Not a OEM filter?

NZDubNurd · Feb 8, 2017

You could try it!

It's not something I would expect, there still has to be a wide open leak path somewhere, assuming the oil pump is capable of creating real pressure.

Cliff · Feb 8, 2017

Is there some where in the head that could of failed?

Cliff · Feb 13, 2017

Still nothing, ready to pull motor out!

NZDubNurd · Feb 14, 2017

These things are very hard to diagnose remotely - there may be some subtle thing you don't see right now, or there could be a major internal fault, or mis-assembly.

The ONLY time I've seen 0 oil pressure on a properly running/assembled engine, is on a gravity feed system, like our '29 Ford Model A - it has a pump that pumps oil from the sump, up to a trough that feeds the bearings by gravity. With 15W-40, you can have 0 oil pressure when warm, because there is NO restriction, really. Simply adding the restriction of an oil filter gives it a very low pressure reading (2 to 5 PSI) - Your Golf would need no restriction to flow, to get a ZERO reading, or the pump has to stop pumping (mechanically stopped, or sucking air from a damaged pickup etc).

We're really going to struggle with helping remotely :cry:

Cliff · Feb 28, 2017

Found the problem. One of the balancer shafts broke and it took out a couple o rings on it.

Cliff · Mar 11, 2017

Put in two new balancer shafts. Got good pressure now..

LLuKKi · Jan 10, 2020

Hi,
Within a month, the engine has been running a 1.4 TSi 90kw CAXA engine.
Cold oil pressure 1bar at idle, 2-3 bar at 2000 / rev.
After 20-30min, idle 0.2-0.4 bar, at 2000 rpm 1.5 bar.
Cams with head cover checked, second oil pump, intake manifold replaced,
Ol.filter exchanged - origo according to VIN, turbo mesh, wiring including adjusters also second.
Both engines are all checked equally and the result is the same.

Any idea where to look? Has anyone met anything like this?

Thanks for the advice

maxx16v · Jan 15, 2020

why do people HIJACK these posts ??????????

PetrolDave · Jan 15, 2020

maxx16v said:
why do people HIJACK these posts ??????????

Laziness - instead of creating their own thread?

Lost oil pressure

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