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HELP ancillary belt wrecked my car !



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#1 Jeff TT

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Posted 13 April 2017 - 06:41 PM

2009 3.0dti s line


So Sunday was on the motorway when suddenly a red warning flagged up with shut down engine immediately !!, well as it turned out a piece of the ancillary ( serpentine ) belt had torn back, this bit had flapped around hitting the loom for the oil pressure sender.

So had the recovered and removed the under tray to find the pressure switch electrical connection smashed off the loom and the engine, the cable loom all battered and the belt bits wrapped around the water pump and other pulleys and then I saw a dribble leak on the pump too, looks like that was already there as there was a crusty pink trail down the block.

Now to add to my issues I live on the Algarve in Portugal, not exactly easy to get Audi parts in a rush !

I was able to get a new water pump ancillary belt / pulleys, oil pressure sensor and belt pulleys from a motor factors however.

All good but found the space to actually do the job near impossible,, saw on the internet there is a service position for the front end of the car where you undo a zillion nuts and bolts and the facia radiator etc move forward 6 inches. I could not find an exact how to so struggles to do it with the confined space yesterday.

Well got it all done yesterday topped water etc. ran fine no leaks on the drive.... Went out this morning and got a repeated check oil level warning despite pulling over and doing an oil check in the on board MMI that came back full as I knew it would, Anyhow after pulling away it again flashed the red oil can and said check oil level ?? decided to go back home and when I arrived the electric fans were running and did for a long time after shut off ( not heard them do that before ) and then noticed the water pump was leaking ! argh !! there was no massive pressure in the cooling system and plenty of water / antifreeze.

So with nothing to loose stripped it all out again today, and removed the new water pump it looked ( maybe ) like the gasket rubber seal may have displaced when I fitted it at one point. probably due to the small space I had.

So all back together, this time a lot quicker of course, glued the seal in place this time so it could not move.

Well exactly the same, ticks over for 30 mins no issue, heater hot, take a 1 kilometer drive and oil level warning again but even worse heater goes cold and when I get back water pump leaking again !!! argh !!! checked the water level and removed the expansion cap slowly only a slight hiss and a gurgle and the water level dropped as expected as it released some air.

So there we have it, the last two days stripping and fitted new parts and no further forward. of course my only thought now with the pump is it is not an Audi one and maybe an issue with it once the engine gets warmer and the engine under load ???

So what can I ask you?

First what the thoughts about the oil level warning ? the sensor is reading the level correctly when forced to through the MMI, when the belt damaged the cables to the oil pressure switch it actually shorted them out wonder if that could of blown a fuse or have some impact on the issue.

The pump, non Audi ... thoughts ? 50 miles journey but thats ok but guess what closed till Monday Argh !!

Do anyone know how to pull the front off into service mode ? or a link, where you get the extra room ?

I have a ferry booked for a trip back to the UK a week Tuesday and got to get its sorted asap, any advise would be appreciated, the ....madness is this should of been a quick job done and finished argh !! sorry for the long thread


Cheers guys

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#2 Lad

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Posted 14 April 2017 - 06:13 AM

PM Sent.

#3 Jeff TT

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Posted 16 April 2017 - 09:47 AM

Update to this: thanks for the info from Lad, I stripped the front off and it took less than an hour, made access to the pump so much better, changed and back together, rebuilt front in under 30 mins with help of a mate.

Three test drives later no leaks and purring like a kitten, only fly in the ointment is the check oil level keeps popping up despite the level via the MMI showing as full.

Jeff

#4 Lad

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Posted 17 April 2017 - 12:30 PM

Good Job...!

Question: did you have to remove the headlights or do they slide forward also...?

#5 Jeff TT

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Posted 20 April 2017 - 08:26 AM

 Lad, on 17 April 2017 - 12:30 PM, said:

Good Job...!

Question: did you have to remove the headlights or do they slide forward also...?



No they moved forward as well, in fact moving it forward was so easy I would do it every time now to work on the front of the engine.

Oh and no need for any special tools or lock pins as seen elsewhere, slide forward and stayed in place no issue.

Cheers

Jeff

#6 Lad

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Posted 20 April 2017 - 04:54 PM

How about the headlamp washers on the bumper? Do they disconnect easy? I need a new timing belt and water pump so its coming off in the next couple of weeks....

Cheers,

Lee.

#7 Jeff TT

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Posted 25 April 2017 - 08:59 PM

Ok still here in need of more advise, so my 2009 Q5 with the 3.0 dti engine ( 72k miles ) has been faultless for the past 2 years and enjoyed it.

However a week or so ago whilst on the motorway the ancillary belt frayed and it whipped around and damaged the loom at the front of the sump and broke the connector off the oil pressure sender. This was my first warning something was up as the dash lit up with red oil can and beeping to check oil level, I pulled over and saw the ancillary belt so called recovery and got it home.
So pulled the front in to service position and changed the water pump, ancillary belt and pulleys, the tensioner was in great condition and so did not do that, all part were from Audi. The cable loom was only slightly damaged not cut just a few places where the insulation was gone, I made complete and careful repairs, the oil pressure switch plastic was broken so replaced it with one from Audi. The connector to the sensor however was also damaged but could not get one so refitted it and cable tied it in place, all looked good, new antifreeze and started up fine, no issues.

Well that was short lived as soon as I got pulled out onto the main road three beeps and red oil can and message saying check oil !! surfice to say the level was checked in the MMI display and was showing full ?? I have checked and double checked everything and can not find any issue elsewhere, I even changed the oil pressure sender again, the car runs fine and sounds fine but that red can flashing is worrying.
After days of messing about I finally gave up and sent it to Audi, they had it 6 hours and concluded the connection on the oil pressure sender was the issue, but would need to order one and on back order, quoted me 150 Euro to change it and the sensor again !!

Frustrated returned home, an 80 mile round trip at motorway speeds with NO issues.
In desperation I cut the plug off and soldered the cables directly to the sensor so no chance of a bad connection now, all back together exactly the same issue, starts up fine no warning will tick over for as long as you want with no warning, but drive out of my road and beep beep beep ... argh !!!

So today I did an oil and filter change just to make me feel better about the oil level, and yep you guessed it exactly the same issue. I can only assume this is an electrical issue as prior to the belt letting go there was no issues, and despite my reservations I cannot believe I have low oil pressure as a result of the belt going, and still using the car at motorway speeds sure the engine would have let go by now.

One other thing I have tried running the car with the oil pressure sender disconnected and get the same result, no warning until I drive away, guessing a certain rev or speed level has to be attained.

So of course these things always happen at the wrong time, I have a 700 mile journey tomorrow night from the Algarve to Bilbao, will have my backside in my hand the whole way at this rate.

Again what is everyone`s opinion on me actually having low or no oil pressure as a result if the belt letting go, seems not possible.

Finally any idea`s ?? is there a reset of the pressure sensor circuit needed ???

Help guys have tomorrow to try and sort it

Jeff

#8 Lad

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Posted 27 April 2017 - 06:53 AM

I feel for you Jeff, electrical issues can be a right pain.

Ideally you need Ross-Tech VCDS to look at the sensors and monitor the live readings, that way you'll see any step changes between tick over and driving etc.

I suspect you have two sensors related to oil; the pressure sensor and the level sensor that sits in the sump and gives its reading to the MMI. I would think either of these sensors could trigger the Red warning you are seeing. I know the Oil level appears okay on your MMI but an intermittent glitch may trigger the light.

I'd be inclined to also have a look around the Oil level sensor. Disconnect it and see what that does.

But overall your life will be a lot easier if you can find somebody local to you with VCDS who is willing to take a few quick readings for you.

Good luck (again)..!





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