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Registered 2004 SLK230
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167 Posts
Discussion Starter #1
Hi again to you all. I am asking for your collective knowledge having learned the hard way (VERY HARD WAY ) with my previous convertible albeit one with a Mohair Hood that there was a recommended direction when faced with parking in the likely event of a summer storm or indeed a Winter snow event.
I had discovered that there was 10+ litres of water in the rear wheel well and a further 7 litres in the rear storage space for the battery that had accumulated after a prolonged period of parking facing uphill.

This was quickly rectified and thoroughly dried out - there was absolutely no warning/advice in the owner manual as to this crazy situation.
The car was a BMW 325Ci Convertible Automatic. Non of the drainage points were blocked,the situation arose because the drains were at the front end of the boot area and that was slightly higher than the rear area with no drains.
The water would go into the dedicated 'Hood Box' and collect with no means of escape and as such it would then drain down into the wheel well and the battery housing albeit the battery was in a dedicated plastic box a as such was OK.

What if anything is there about the SLK in that respect ?

I have read the info on the numerous drainage points/holes but as I understand they just deal with the water that runs off of the roof,screens and windows.
 

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Registered 2002 SLK320
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1,986 Posts
Hi,

Having got fairly intimate with my R170 V6 I'd advise leaving it parked level, and if like me you are in a rainy area surrounded by trees, clean out them drains on a regular basis.

Also unless you intend to go wading, it is a good idea to identify the lowest areas of Floorpans and Boot floors wherever water can collect, and drill a few strategically placed 10mm holes in these areas, not forgetting to check behind where you are drilling for wires, pipes etc and paint around the hole to prevent tin worm attack.

This will at least stop large quantities of water creating miniature lakes within normally unseen areas of your pride and joy ;)

HTH,

Cheers Dave
 

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Registered 1997 SLK230 Kompressor
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230 Posts
There are drain holes in the wells below the trunk lift cylinders which could get blocked I suppose from leaves or somesuch blowing into the trunk when open. It's not obvious they are there unless you are replacing cylinders. Mine were more or less clear although there was some debris in the wells.
 

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Registered 2001 SLK320
Joined
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878 Posts
Hi,

Having got fairly intimate with my R170 V6 I'd advise leaving it parked level, and if like me you are in a rainy area surrounded by trees, clean out them drains on a regular basis.

Also unless you intend to go wading, it is a good idea to identify the lowest areas of Floorpans and Boot floors wherever water can collect, and drill a few strategically placed 10mm holes in these areas, not forgetting to check behind where you are drilling for wires, pipes etc and paint around the hole to prevent tin worm attack.

This will at least stop large quantities of water creating miniature lakes within normally unseen areas of your pride and joy ;)


HTH,

Cheers Dave

Not sure I concur with this recommendation as now you have opened up the floors to water entering from below.
Keeping the drains clear is sufficient in my experience.
 

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Registered 2004 SLK230
Joined
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167 Posts
Discussion Starter #7
Hi,

Having got fairly intimate with my R170 V6 I'd advise leaving it parked level, and if like me you are in a rainy area surrounded by trees, clean out them drains on a regular basis.

Also unless you intend to go wading, it is a good idea to identify the lowest areas of Floorpans and Boot floors wherever water can collect, and drill a few strategically placed 10mm holes in these areas, not forgetting to check behind where you are drilling for wires, pipes etc and paint around the hole to prevent tin worm attack.

This will at least stop large quantities of water creating miniature lakes within normally unseen areas of your pride and joy ;)

HTH,

Cheers Dave
Hi Dave. It is not possible to park my cars on level ground as the parking area creates either an up/down direction.

I must say that I was a little alarmed to read of your suggestion regarding putting holes into the floor pan and boot areas.
This would be especially unwelcome if parts of the sections are double skinned.
 

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Registered 2002 SLK320
Joined
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1,986 Posts
Hi Dave. It is not possible to park my cars on level ground as the parking area creates either an up/down direction.

I must say that I was a little alarmed to read of your suggestion regarding putting holes into the floor pan and boot areas.
This would be especially unwelcome if parts of the sections are double skinned
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Hi,

It was a very general statement that it can be a good idea to do so. It is up to the individual as to whether to or where to do this.
I was not suggesting peppering any Cars with a whole load of 10mm holes!!

Which is why I said to check behind before drilling, and don't do it if you go wading, i.e. have large inches deep areas of water to traverse in your locale.

It's whoevers own car and their choice at the end of the Day.

As these and other Mercedes cars get older they do let a little water in here and there, despite best efforts to keep them Water tight.
Most Mercedes have Electronic Modules and components at lower levels.
A little bit of water that gets in, just a few droplets, soon builds up into ponds when the drains get blocked, seals lose efficiency etc etc and then often causes a need for very expensive repairs.

I am not suggesting drilling loads and loads of holes, just a very few strategically placed ones. On some Cars you can simply remove a few rubber bungs.
I also advised painting around any drilled areas to avoid corrosion.

I live in a very rainy area and see the damage water ingress causes to vehicles on a daily basis in my workshop, almost all of which can be prevented without major expense.

Hope this clarifies,

Cheers Dave
 

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Premium Member 2001 SLK320
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1,032 Posts
Referring just to the R170.

If parked nose high, the curve at the base of the rear glass means water coming off it pools in the middle. It cannot travel uphill to the sides where the drains are. If the is much rain and the car is on a steep slope, the depth of water in the gutter at the front of trunk lid will be at the top of the seal and one is purely relying upon a continuous tight seal to prevent water slowly getting through and dripping or flowing into the middle of the trunk.

If the car is parked quite nose low, the drains at the front sides of the trunk lid will deal with most of the water unless there is a seriously high rainfall, in which case water will overflow the sides. And then the high volume will test the effectiveness of the complicated overlap of the rear window frame lower seal and the rear side window lower seals.

I’d preference being nose down and being sure all the drains were clear.

As an Engineer, responsible for programming the robots that apply all the acrylic sealer along all the body panel seams, once said to me,
“ All cars are water resistant, not watertight”

If one has any excuse at all to remove the rear side trunk trims in the R170, it is worth the trouble to do it and have a good look at everything there, checking for trunk cylinder leaks, the drains in the rear floor sides for dust and debris and for previous damage or mods.
Mine were clear so far so I expect them to be good for many more years. I never park under trees by the way.
 

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Registered 2002 SLK320
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1,986 Posts
/\ /\ /\ Agreed

Sadly the R170 has it's PSE mounted right at the lowest point of the Wheel Well in the Trunk, also has Side Impact Sensors mounted right near the rearward Floor-pan under Seats, and BOSE and Auto Trans ECU plus many Wiring Multiplugs behind the Front Passenger Footrest, again some of it very low down.

MB Carpets are Foam backed making early detection of water ingress very difficult.

Other MB Cars have things like Rear SAM, Telephone, and heaps of other Modules mounted below the Rear Seat, and Main Pre Fuses under the Front Passenger Footrest at Floor-pan level that is usually a very expensive fix.

So yeah, plenty potential for very large repair bills :(

Myself and many local car owners are surrounded by Trees and have more than our fair share of Rainfall.

In an ideal world I'd have a huge unit to park all my Cars in ;)

HTH,
 

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Registered 2004 SLK230
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167 Posts
Discussion Starter #11
Hi again all and thank you individually for your suggestions.

Whilst polishing the car this morning I did notice that something that Pictor mentioned :--And then the high volume will test the effectiveness of the complicated overlap of the rear window frame lower seal and the rear side window lower seals.

Yes I thought that that was an oddity being as there does not appear to be anything that could cause rubbing and wear on the paintwork at that point;it is currently restricted to one small area just to the right of centre that will require some attention when we get some stabilised weather in the next few weeks.
 
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