Smelly oil vapours

[Muir, Lance]

Landy Greetings

I have a problem that has me mystified.

My old 110 gearbox came back from repairs and installed it ,started up and took it for a spin to “check it out” while I was travelling I noticed a smell of “burnt oil” in the cab, no smoke anywhere and from past experience have had that with such a installation oil is messed on the exhaust which normally burns off after a few kilos.

The next day happy that the gearbox was operating right went for a 100km trip to load furniture off at my daughters and the oil smell was seemingly getting worse, I got home checked everything and found the oil breather pipe from tappet to carb was cracked so replaced that and saw oily area by back oil breather which I rectified, checked oil levels in gearbox, transfer box and engine thinking all should be well.

Next day did another 100km trip and the oil smell was still there, so much that my daughter travelling behind me about that bad oil smell when we stopped at her place.

 

Since then Iv checked everything and cant find where its coming from.However this morning just before I climbed in I observed a small pool of oil below the passanger side front wheel flap?????????????????The mystery was baffeling, I traced the oil up to the brake servo pipe that goes to inlet manifold.

 

I am now dumfounded I ask my self is there sump pressure issue ? Is the pipe with valve on between the servo and inlet manifold an issue.

All help greatly appreciated

 

 

Lance Muir

GH South Plant Engineering Foreman

E- lance...@angloamerican.com

Tel  +27 (0)13 687 5361

Cell +27 (0)78 775 0509

Fax  +27 (0)86 651 5328

 

COAL

GOEDEHOOP COLLIERY

Private Bag x410, Vandyksdrift, Mpumalanga, 2245, South Africa

T +27 (0) 13 687 5300

F +27 (0) 13 687 5425

www.angloamerican.com

A member of the Anglo American plc group

 

[Mike Nieuwoudt]

Which engine, gearbox?

[Muir, Lance]

Sorry for that its 3.5 V8 with LT95 GEARBOX

 

From: lroc-te...@googlegroups.com [mailto:lroc-te...@googlegroups.com] On Behalf Of Mike Nieuwoudt
Sent: 26 May 2016 08:45 AM
To: LROC Techtorque Discussion Forum
Subject: [LROC Techtorque] Re: Smelly oil vapours

 

Which engine, gearbox?

On Thursday, May 26, 2016 at 7:57:24 AM UTC+2, lance...@angloamerican.com wrote:

Landy Greetings

I have a problem that has me mystified.

My old 110 gearbox came back from repairs and installed it ,started up and took it for a spin to “check it out” while I was travelling I noticed a smell of “burnt oil” in the cab, no smoke anywhere and from past experience have had that with such a installation oil is messed on the exhaust which normally burns off after a few kilos.

The next day happy that the gearbox was operating right went for a 100km trip to load furniture off at my daughters and the oil smell was seemingly getting worse, I got home checked everything and found the oil breather pipe from tappet to carb was cracked so replaced that and saw oily area by back oil breather which I rectified, checked oil levels in gearbox, transfer box and engine thinking all should be well.

Next day did another 100km trip and the oil smell was still there, so much that my daughter travelling behind me about that bad oil smell when we stopped at her place.

 

Since then Iv checked everything and cant find where its coming from.However this morning just before I climbed in I observed a small pool of oil below the passanger side front wheel flap?????????????????The mystery was baffeling, I traced the oil up to the brake servo pipe that goes to inlet manifold.

 

I am now dumfounded I ask my self is there sump pressure issue ? Is the pipe with valve on between the servo and inlet manifold an issue.

All help greatly appreciated

 

 

Lance Muir

GH South Plant Engineering Foreman

E- lance...@angloamerican.com

Tel  +27 (0)13 687 5361

Cell +27 (0)78 775 0509

Fax  +27 (0)86 651 5328

 

COAL

GOEDEHOOP COLLIERY

Private Bag x410, Vandyksdrift, Mpumalanga, 2245, South Africa

T +27 (0) 13 687 5300

F +27 (0) 13 687 5425

www.angloamerican.com

A member of the Anglo American plc group

 

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[Mike Nieuwoudt]

Thought so :-). Oil on the ground at passenger mudflap (and most probably also all over the clucth slave cylinder area)? I had the same issue with my 89 V8. It is your tappet cover gaskets leaking, probably still has the old cork gaskets, they will be totally useless by now if still original. The oil then get onto the exhaust manifold and raise a stink but very little smoke as it is vaporised but not burning.

Change the gaskets to the newer rubber gaskets and the problem disappears, not expensive and easy to do (most difficult part is the cleaning of the tappet covers).

[Muir, Lance]

Thanks Mike I will do that, I am doing a compression test this afternoon as it has been suggested there’s a chance that she’s building sump pressure. To have oil coming from the manifold pipe where it connects  onto the brake servo could be the non-return valve or excess sump pressure?

 

From: lroc-te...@googlegroups.com [mailto:lroc-te...@googlegroups.com] On Behalf Of Mike Nieuwoudt
Sent: 26 May 2016 09:47 AM
To: LROC Techtorque Discussion Forum
Subject: Re: [LROC Techtorque] Re: Smelly oil vapours

 

Thought so :-). Oil on the ground at passenger mudflap (and most probably also all over the clucth slave cylinder area)? I had the same issue with my 89 V8. It is your tappet cover gaskets leaking, probably still has the old cork gaskets, they will be totally useless by now if still original. The oil then get onto the exhaust manifold and raise a stink but very little smoke as it is vaporised but not burning.

Change the gaskets to the newer rubber gaskets and the problem disappears, not expensive and easy to do (most difficult part is the cleaning of the tappet covers).

On Thursday, May 26, 2016 at 9:02:59 AM UTC+2, lance...@angloamerican.com wrote:

Sorry for that its 3.5 V8 with LT95 GEARBOX

 

From: lroc-te...@googlegroups.com [mailto:lroc-te...@googlegroups.com] On Behalf Of Mike Nieuwoudt
Sent: 26 May 2016 08:45 AM
To: LROC Techtorque Discussion Forum
Subject: [LROC Techtorque] Re: Smelly oil vapours

 

Which engine, gearbox?

On Thursday, May 26, 2016 at 7:57:24 AM UTC+2, lance...@angloamerican.com wrote:

Landy Greetings

I have a problem that has me mystified.

My old 110 gearbox came back from repairs and installed it ,started up and took it for a spin to “check it out” while I was travelling I noticed a smell of “burnt oil” in the cab, no smoke anywhere and from past experience have had that with such a installation oil is messed on the exhaust which normally burns off after a few kilos.

The next day happy that the gearbox was operating right went for a 100km trip to load furniture off at my daughters and the oil smell was seemingly getting worse, I got home checked everything and found the oil breather pipe from tappet to carb was cracked so replaced that and saw oily area by back oil breather which I rectified, checked oil levels in gearbox, transfer box and engine thinking all should be well.

Next day did another 100km trip and the oil smell was still there, so much that my daughter travelling behind me about that bad oil smell when we stopped at her place.

 

Since then Iv checked everything and cant find where its coming from.However this morning just before I climbed in I observed a small pool of oil below the passanger side front wheel flap?????????????????The mystery was baffeling, I traced the oil up to the brake servo pipe that goes to inlet manifold.

 

I am now dumfounded I ask my self is there sump pressure issue ? Is the pipe with valve on between the servo and inlet manifold an issue.

All help greatly appreciated

 

 

Lance Muir

GH South Plant Engineering Foreman

E- lance...@angloamerican.com

Tel  +27 (0)13 687 5361

Cell +27 (0)78 775 0509

Fax  +27 (0)86 651 5328

 

COAL

GOEDEHOOP COLLIERY

Private Bag x410, Vandyksdrift, Mpumalanga, 2245, South Africa

T +27 (0) 13 687 5300

F +27 (0) 13 687 5425

www.angloamerican.com

A member of the Anglo American plc group

 

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[Mike Nieuwoudt]

If the crankcase breathing system is working correct it should not be able to build up pressure even with low compression readings. The pipes from the tappet covers to the carbs via the flame traps should suck any blow-by straight back to the intake manifold. On later models there is also a one way valve in the system (RH tappet cover then have a flame trap with two nozzles on one side, and the other side of the valve is connected to a nozzle on the air inlet piping behind the carbs). If fitted check that the one way valve is operating correct. I have discarded that system as well, and fitted a single nozzle flame trap (it was a marginal system for some obscure emission control attempt). Also check the small air inlet at the back of the engine is open. It has a small filter in its line, I've discarded that and have it breath through the normal air filters.

[Muir, Lance]

That is now interesting. What would be the best test for the flame traps (one way valve )?

E- lance...@angloamerican.com

Tel  +27 (0)13 687 5361

Cell +27 (0)78 775 0509

Fax  +27 (0)86 651 5328

 

COAL

GOEDEHOOP COLLIERY

Private Bag x410, Vandyksdrift, Mpumalanga, 2245, South Africa

T +27 (0) 13 687 5300

F +27 (0) 13 687 5425

www.angloamerican.com

A member of the Anglo American plc group

 

[Mike Nieuwoudt]

Reading this again. Excess blow-by vented back to the inlet could perhaps transport oil vapor/droplets to the inlet manifold, ending up in the brake vacuum pipe (which is connected to the inlet manifold passages after the carbs) and getting sucked down it when the vacuum leaks away after switching off. But I guess it is more a brake pipe non return valve leaking too much. How long does your booster retain vacuum after switching off the engine? It should retain it quite long (you can feel it when pushing the brake the first time after switching off). And I think it is not related to the oil smell.

On Thursday, May 26, 2016 at 9:52:47 AM UTC+2, lance...@angloamerican.com wrote:

[Mike Nieuwoudt]

Flame traps are not one-way. They only have metal mesh inside to prevent backfiring flames ending up in the crankcase and setting off a vapor explosion (which would briefly overpressurise the crankcase :-). The one-way is a separate component (mine was yellow zinc plated, the flame traps are the smaller grey jobbies), preventing crankcase overpressurising and vapours after switching off to vent into atmosphere by connecting it into the induction system where it vent out via the air filters (which then retains some of the vapour).

[Walter]

Hi Lance

 This is not a problem, it is Land Rover feature. When you no longer smell oil burning, or see oil on the ground (your Landy is marking its territory), it is time to manually check your oil levels. 

[Muir, Lance]

I love your sense of humour. My old series 1 I had as long as it messed oil I was happy cause I knew it still had oil. lol

 

From: lroc-te...@googlegroups.com [mailto:lroc-te...@googlegroups.com] On Behalf Of Walter
Sent: 30 May 2016 09:20 AM
To: LROC Techtorque Discussion Forum
Cc: se...@thegearboxcompany.co.za
Subject: [LROC Techtorque] Re: Smelly oil vapours

 

Hi Lance

 

 This is not a problem, it is Land Rover feature. When you no longer smell oil burning, or see oil on the ground (your Landy is marking its territory), it is time to manually check your oil levels. 

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[Muir, Lance]

As promised I would give feedback on my mystery oil smell issue.

Well after replacing brake servo master cylinder etc etc I kept on thinking,  whatever is causing the smell happened after I replaced the gearbox and after looking everywhere for the hundredth time noticed that the two gearbox breather pipes outlets were not where they always was, while stripping the gearbox out I lifted the breather pipes out the way and tied them to the heater box to be out the way, I loosened them and dropped them down to their original position and guess what the oil smell coming into the cab was gone, I could believe it, a lesson learnt, it’s amazing how you think out plenty of possibilities but the simple issues is in front of your eyes.

 

How embarrassing, I’m in love with my Landy again.