Author Topic: Audi sludge trap  (Read 421 times)

Online Greybeard

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Audi sludge trap
« on: 01.03. 2021 11:13 »
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Offline muskrat

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Re: Audi sludge trap
« Reply #1 on: 01.03. 2021 18:50 »
G'day GB.
I'm surprised it lasted that long.
Cheers
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Offline ellis

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Re: Audi sludge trap
« Reply #2 on: 01.03. 2021 19:26 »
Had a customer in the 70s with a Rover 3.5 from new. It had covered 45000 miles so he decided it was time to have an oil and filter change. First one scince new. Poor chap kept putting it off for years thinking he was saving some money. Never did see him again.

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Offline morris

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Re: Audi sludge trap
« Reply #3 on: 01.03. 2021 20:01 »
I'm surprised it lasted that long.
German engineering...?  *whistle*
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Re: Audi sludge trap
« Reply #4 on: 01.03. 2021 20:20 »
T Landcruisers from some years ago had combustion carbon reisdues going into the oil, which clogged the mesh filter at the intake to oil pump, bottom of the sump. Oil pressure light did not show anything. So many drove happily until 'bang'- total engine failure, internals well melted together. All due to wrong material in 4 x 0.1$ sealing washers.

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Online Black Sheep

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Re: Audi sludge trap
« Reply #5 on: 02.03. 2021 07:22 »
Went to change the oil on a compressor - nothing came out. It had been run so long without an oil change that the oil had gelled. It took a lot of cleaning out and several oil changes before the oil looked at all respectable.
At the same plant hire company, the foreman decided it was time to overhaul the engine of his diesel Land Rover (oil light permanently on). He drained the oil and refilled with paraffin to run it for 5 mins to clean the internals. However, when he tried to stop it, it kept running. The oily paraffin was being drawn in through the worn valve guides and it just kept going, faster and faster until the inevitable bang...
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Online Rex

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Re: Audi sludge trap
« Reply #6 on: 02.03. 2021 08:49 »
I'm surprised it lasted that long.
German engineering...?  *whistle*

My Audi A6 oil pump failed below 100,000 miles, as did the pump in a Mk 2 Golf I had some years back. Both had regular oil changes and servicing, and the garage who changed the pumps said it was a regular job changing oil pumps.

Online Greybeard

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Re: Audi sludge trap
« Reply #7 on: 02.03. 2021 09:07 »
... when he tried to stop it, it kept running.
There are many videos of diesels running away on YouTube. The engine burns its own oil.

https://youtu.be/j4rMfrERpG8

Where is that? It looks like Britain but the reg plates don't look like the UK ones. I'm guessing Australia or New Zealand

Online bsa-bill

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Re: Audi sludge trap
« Reply #8 on: 02.03. 2021 11:13 »
Quote
It had covered 45000 miles


I recall a TV programme (possibly Tomorrow's World) where they ran a car for 75000 miles without changing the oil, the trick was some device and a tap to remove the water from the oil, so the oil did not deteriorate.
Back in that day tho not changing the oil was not the same as running on the same oil as engines then USED oil so got it topped up pretty regular, My last car (Fucus) and my Fiesta just don't use oil at all, it gets changed at the yearly service and that it (I do still pull out the dipstick just in case)
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Online berger

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Re: Audi sludge trap
« Reply #9 on: 02.03. 2021 11:53 »
greybeard about 10 years ago a mate of mine was having trouble with his turbo on his land rover, we started it up and while it was running it sucked the oil through the turbo and just kept going . he tried to stop it by putting it in gear and something broke in the gearbox and it just ran on pouring smoke all the way down a major road. when it blew up all the inter cooler and pipes were full of oil. at the time I didn't know which way to run *lol* since then I have come across a few turbo cars that had the same turbo failure and ran on the oil, one instance was on a house drive and they had to get the fire brigade out. since then I have been very wary of turbo diesels. I don't know if the manufactures have made this problem with the turbos history or if it can still happen.

Online Triton Thrasher

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Re: Audi sludge trap
« Reply #10 on: 02.03. 2021 12:12 »
If the air intake is accessible and not too big, blocking it with your hand can be a useful trick to stop an engine.

Online berger

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Re: Audi sludge trap
« Reply #11 on: 02.03. 2021 12:42 »
If the air intake is accessible and not too big, blocking it with your hand can be a useful trick to stop an engine.  IF is the thing

Offline Swarfcut

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Re: Audi sludge trap
« Reply #12 on: 02.03. 2021 13:28 »
    NEVER  PUT YOUR HAND ANYWHERE NEAR THAT INTAKE. Block it with something tough, like a plank of wood, metal sheet. Rag will get sucked in, and so will you and scratching an itch won't be an option anymore.  The turbo bearings oil feed offers an unmetered supply of combustible fuel, so if the bearing seals here fail you're screwed. Even the diesel fuel cut off won't work, but flattening  the engine oil  feed pipe  to the turbo in this scenario is another theoretical possibility if you want to be a hero.  In an industrial setting a handy CO2 fire extinguisher to smother the air intake may save the day. In runaway the power output will easily wreck the clutch and transmission, so an attempt to stall the engine ain't on.

 Swarfy.

 Additional. Fords and Vauxhall's with carbs and engine driven mechanical fuel pumps could suffer sump oil dilution with fuel from leaky fuel pump diaphragms. I've had them running with the fuel lines to the carb and pump disconnected, happily ticking over  on fuel vapour drawn up from the sump via the crankcase breather.  Ford CVH motors were renowned for sludging up the valve gear when the gauze filter in the rocker cover silted up. A new rocker cover was needed, the originals being impossible to clean out with certainty.

Online Bsareg

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Re: Audi sludge trap
« Reply #13 on: 03.03. 2021 11:04 »
Detroit two stroke diesels have a emergency flap on the inlet for just that purpose.
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Online Triton Thrasher

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Re: Audi sludge trap
« Reply #14 on: 03.03. 2021 19:02 »
    NEVER  PUT YOUR HAND ANYWHERE NEAR THAT INTAKE. Block it with something tough

I must have a tough hand. 

The maximum pressure difference is 15psi.  It would take more than that to suck me through a two inch hole.