Burning oil smell

**landrover dave** · 8th February 2012, 07:18 PM

As mentioned on here a while ago, if there is not enough flow on the oil return there will be oil passing the turbo seals into the intake or exhaust
this could be where excessive oil is getting into the inlet. Its not uncommon to have some oil in the inlet even on new turbos

Originally Posted by 110Landy86

Hey Steve, I have brass 3/8 BSP 45deg fitting into the oil pump cover. I have replicated the entry position w.r.t the oil pump cover, as shown in various threads on here. I figured there would be a small increase in flow restriction at the fitting so I enlarged the annulus marginally by drilling it out.

As you mentioned, with the 3/8 BSP fitting there isn't much wall thickness at the critical point (say ~3 mm).

The turbo was purchased brand new and has done ~8000 km. AFAIK there isn't any/ very minimal turbo shaft play.

Basically, I get the smell after its been working hard.

I was thinking of doing one of the following:

Further reduce the turbo oil feed flow rate (already have a flow restrictor installed in turbo feed); or
Install a Y-piece directly after the turbo and run two 3/8" (ID) outflows. One to the oil pump cover and one into the sump through a one-way valve. Are there any locations that are more favourable/ easier to access?

Appreciate your thoughts.

Cheers Joe

**bee utey** · 8th February 2012, 07:48 PM

Assuming this is the oil pump cover:

...I would be thinking of fitting a thin walled 16mm OD steel tube into it, anything threaded would be way too restrictive. Find a suitable bit of bent tube at a wreckers, fit it to the cover either by a press fit or brazing. The one turbo install I did years ago had to have a fitting this size, 11mm bore was simply not enough.

**landrover dave** · 8th February 2012, 08:50 PM

Ive put aftermarket turbos on cruisers an the return the oil direct to the sump through a 1/2" pipe for that reason

Originally Posted by bee utey

Assuming this is the oil pump cover:

...I would be thinking of fitting a thin walled 16mm OD steel tube into it, anything threaded would be way too restrictive. Find a suitable bit of bent tube at a wreckers, fit it to the cover either by a press fit or brazing. The one turbo install I did years ago had to have a fitting this size, 11mm bore was simply not enough.

**steveG** · 8th February 2012, 09:55 PM

My drain is the same a that photo, and no problems. Not saying that's not the problem on yours - just that its working for me. My turbo is a T25G so journal bearings.

Some useful info from Garrett about drains and oil leakage etc:
Oil & Water Lines | Turbobygarrett
Oil Leakage | Turbobygarrett

Particularly of interest is that if your compressor inlet is restricted (clogged air filter etc) it can cause compressor oil leakage.

Steve

**isuzurover** · 9th February 2012, 12:25 AM

Originally Posted by bee utey

Assuming this is the oil pump cover:

...I would be thinking of fitting a thin walled 16mm OD steel tube into it, anything threaded would be way too restrictive. Find a suitable bit of bent tube at a wreckers, fit it to the cover either by a press fit or brazing. The one turbo install I did years ago had to have a fitting this size, 11mm bore was simply not enough.

That is my turbo oil drain. It has been in use for almost 100 k km now with no problems.

**110Landy86** · 9th February 2012, 11:30 PM

Benno I have exactly the same connection at the oil pump cover as shown in your pic.

**110Landy86** · 9th February 2012, 11:36 PM

Originally Posted by Dougal

What is your breather setup?

Breather setup at the moment is via the side crack case breather, vents to a provent (200), located near the wiper reservoir, through rubber tubing (radiator hose) of the same diameter.

I would like to fit a turbo-type tappet cover with the 19mm (?) outlet and run two breathers. Not easy getting hands on these though

**110Landy86** · 9th February 2012, 11:38 PM

Originally Posted by steveG

My drain is the same a that photo, and no problems. Not saying that's not the problem on yours - just that its working for me. My turbo is a T25G so journal bearings.

Some useful info from Garrett about drains and oil leakage etc:
Oil & Water Lines | Turbobygarrett
Oil Leakage | Turbobygarrett

Particularly of interest is that if your compressor inlet is restricted (clogged air filter etc) it can cause compressor oil leakage.

Steve

Thanks, will read up. I have a T25/28 hybrid.

**Dougal** · 10th February 2012, 05:32 AM

Originally Posted by 110Landy86

Breather setup at the moment is via the side crack case breather, vents to a provent (200), located near the wiper reservoir, through rubber tubing (radiator hose) of the same diameter.

I would like to fit a turbo-type tappet cover with the 19mm (?) outlet and run two breathers. Not easy getting hands on these though

Ditch the provent and see if it improves. Seriously.
My oil consumption and oil smell problems were caused by my provent.

**isuzurover** · 10th February 2012, 09:06 AM

Originally Posted by 110Landy86

Breather setup at the moment is via the side crack case breather, vents to a provent (200), located near the wiper reservoir, through rubber tubing (radiator hose) of the same diameter.

I would like to fit a turbo-type tappet cover with the 19mm (?) outlet and run two breathers. Not easy getting hands on these though

Where does the small tappet cover breather run to???

EDIT.

Originally Posted by Dougal

Ditch the provent and see if it improves. Seriously.
My oil consumption and oil smell problems were caused by my provent.

Instead of that, I would try venting the provent outlet to atmosphere (temporarily). It sounds as if L86's Provent is mounted where mine is, and as mentioned mine works fine.

In you case Dougal I think "wall flow" is/was your problem. You should put a (small) trap before/after the provent. E.g. - this could be a blind T (i.e. with a blocked 1" hose attached to the vertical section. (this can also be used to measure wall flow).

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