SL500 R230 possible ABC issue / leak

slappy

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I have just moved into a new house and the driveway is quiet a slope.
I parked up the other day and it rained very heavy for ages.
Later on that day I noticed a bit of an oil like substance running down the path. It appeared to be coming from the front of the car.
The car has been driving well and no noticeable issues. A quick google and I find a post similar to mine, car on a hill and heavy rain collects in the ( no idea what its called ) cladding like stuff under the car and overflows and does this. I opened the bonnet and I could see a bit of oil had splashed over the big plastic thing that sits on top of the engine and onto the underside of the bonnet. I thought maybe with the engine being hot and parked on an angle the rain water had come into contact and boiled a little. I can see no obvious leaks.
I parked it on the street as is flat since just keeping an eye on it. Later that day there was a small drop of oil near the front passenger wheel again I can see no leak opening the boot etc.
Since then its been fine. 2 weeks later and I roped it to Manchester yesterday. Had the consumers off line as its been stood, they came on within about ¼ of a mile.
Good run to Manchester and when i came back I got in the car and it said ABC drive carefully.
I turned it off and on and nothing, drove home with no issues. Still can’t see any oil leaks.
Car goes up and down no issues when I press the button and its never sagged.
Later that night I want out and it did it again ABC drive carefully, I turned it off and on and this time it stayed. I decided not to take it out and come on here.
I have just been out and check the fluid level and as far as I can tell it’s in the ranges, the oil does smell a bit burnt which is a surprise to me as it was replaced last year when I had the front struts refurbish in Liverpool, MBTech checked the filters and added clean oil when replacing them.
They did say that it doesn’t go to full pressure, 180 psu I think it should be and and mine was about 110psu from memory so they did say at some point the pump would need replacing.
I have had a good read on here and I’m a bit confused, I clearly must have had some kind of leak as its splashed on the underside of the bonnet and across the big plastic grey thing.
Sorry to be a bit vague
Any ideas / quick wins / things to check? I am not very good with cars. I did see a simple low cost washer post, finger crossed it’s something like that and now a new ABC pump or strut
 

henrysmerc

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I would try and trace the leak -if you've spotted oil at the near side front wheel,get a good powerfull light/torch under the car/bonnet and trace it back hope that helps and good luck with it
 

drmw

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A relatively common problem is corroded washers on a valve block. There is one on the nearside (passenger) right at the front. If you get down on the ground you'll see a tray in front of the wheel that is roughly triangular - it's under that. There's a small hole at the very front where fluid will drip out if the car is pointing nose down.

However, that's quite well insulated from the engine cover so unfortunately it's not very likely to be the cause of your leak, although always possible.

The other symptoms you mentioned do tend to point to the pump - I'm sure I've read here about "blow back" to the reservoir which in turn will blow fluid out where you describe.
 

television

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As David, I have had 2 failures of these washers, the sit in the valve blocks in front of the nearside passenger wheel. Jack the car and remove the front section only of the front wheel arch liner and any leak can easily be seen.

The washers sit under the pressure sensors, replace with copper washers.
 
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slappy

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As ever - cheers everyone

Malcom do you have any guide to help this, or jpegs with circles drawn on to help?
I dont know where the pressure sensors are - can i also replace with any copper washers or do they have to be certain ones etc?
thanks for the help
slappy/rick
 

television

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As ever - cheers everyone

Malcom do you have any guide to help this, or jpegs with circles drawn on to help?
I dont know where the pressure sensors are - can i also replace with any copper washers or do they have to be certain ones etc?
thanks for the help
slappy/rick

Look at the top block and you can see the hole in the end where I have taken the sensor out, the other one that fails is the center one in the same block,you can see it.

DSC00614.jpg


DSC00613.jpg
 
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slappy

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cheers for the pics - any chance you can just draw a circle or something on the rubber washer that i replace with copper?
like i said im not sure in any way.
also im over cautious - im a computer engineer so over think things sorry :(
sending me picture is like me sending you a line of code for a kernel and saying just appy this patch and recompile to fix you problem.
although technically minded cars are nothing i got into - last thing i did was help my dad change the breaks my first car a mini in 1990.

Then this year did your boot fix mod which fixed my PSE issue rahter than having to get it replaced / recondition - again thanks
 
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slappy

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also is this something i can do at home?
is there anything i need to be aware of, just thinking of presure etc?
 

television

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One is on the return line, so next to no pressure there, the other should be safe enough as the valve block should be locked with engine off.
 

Philedge

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With oil ontop of the engine cover its unlikely to be a failed seal on the valve block which is the other side of the inner wing. More likely to have come from the pump or a burst pipe if its reached the underside of the bonnet.
 
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slappy

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i take it oil will **** out all over if i take these out?

as long as there is oil in the pump is it ok to drive, slowly
 

television

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Could well be as Pledge has said. Any one with a SL500 should carry a spare bottle of fluid, you can usually get home on it.

Any chance of a picture of the oil. just keep the tank topped up.
 
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slappy

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will try and take some pics shortly
 
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slappy

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my oil arrived this morning - how do i top it up - take out the dipstick messure and through the hole?
im taking it to my small local guarge in the morning and he will tkae the front wheel off etc and i will get some pics, just need it to get me there and back
got a feeling i will be going into MBTech for this and it end up costing 1K to 2K :(
 

television

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There is a dip stick built into the cap from memory, car sitting at normal height.

Your problem may only be a minor one.
 
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slappy

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you mean on the can of Pentosin ? sorry i didnt think to even open it out of it packaging lol
goes off to open it and take a look
 

Philedge

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my oil arrived this morning - how do i top it up - take out the dipstick messure and through the hole?
im taking it to my small local guarge in the morning and he will tkae the front wheel off etc and i will get some pics, just need it to get me there and back
got a feeling i will be going into MBTech for this and it end up costing 1K to 2K :(

The dip sticks got 2 marks on it-one for when the engine is running(motor an) and the other for when the engine is off(motor aus??) If it needs topping up, stop the engine, wipe the area around the cap so its clean, undo the cap on the top of the reservoir with the pipe connected to it and lift the cap. The oil filter is under the cap so just withdraw it enough to slowly pour oil in. Add a little at a time rechecking level between fills.

Once the level is right start the engine and see if you can see where the oil on top of the engine has come from. If your loosing oil from the suspension quite quickly, be very careful driving the car if the reservoir is likely to run dry as you'll knacker your pump very quickly if it runs dry!! If your pump was only producing 110 bar then your probably due a new pump anyway and that maybe where the oil is coming from. Pump is on the NS front of the engine with the long winding drive belt running round it
 

television

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There is a short dip stick in the cap in the tank in the car.
 

Philedge

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you mean on the can of Pentosin ? sorry i didnt think to even open it out of it packaging lol
goes off to open it and take a look

The dip stick is a rubber knob on top of the reservoir. Reservoir is behind the NS headlight.
 


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