My SLK 230 Adventure - Mercedes Benz SLK Forum

General Modifications R170 Details that make your car different

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#1 Old 06-05-2017
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My SLK 230 Adventure

Hello everyone, in this thread i will talk about my story with the little SLK i bought 1 and half years ago. Let me say right away that english is not my main language, so im sorry for any spelling error.

As i said in my new member intro post i always wanted an SLK since i was a kid, when i found one that i could buy i was happy and i made the mistake of missing some details and inspecting the car properly, i bought it from seller who was not a professional car dealer so i had no warranty or whatsoever.

At first the car seemed fine and the first thing i did as i always do when i buy a used car, i changed the engine oil, transmission oil and diff oil.

1st Surprise, a chunk of gear came attached to the magnetic plug from the transmission, so it explained the whine i heard coming from the car that i tought it was the release bearing from the clutch, it must have been the main gear that was damaged because the whine was present in all the gears. (the sound was like the one you hear when going in reverse, its the teeth on the gears matching at high speed, more present in reverse due to straight cut gears instead of helicoidal gears that are used for the forward gears).

So i had to scour the internet for a 6 speed manual gearbox to switch mine because the noise was really annoying even though all the gears were getting in perfectly and not popping off or anything. I found one off a guy who had an SLK brought in from Germany to sell for parts.

2nd Surprise, the car was leaking coolant through the back of the cylinder head, near the 4th cylinder, confirmed by the fact that the coolant was not coolant but seemed like regular water that was now completely brown, leaving a brown rusty patch all over the engine block and gearbox case. I kept filling up with proper coolant, that kept coming out from the expansion tank filling the plastic cover below the oil pan with a pool of coolant, but the car did not overheat nor the fans came on, temperature kept at a steady 85C going 5kmh through city traffic or going 240kmh on the highway.

It was stupid of me to keep using the car like this i know but it is my only car and i did need it to get to work so i kept filling coolant and kept driving it always paying attention to the temperature. 1 year went by.

2 days before christmas, i got to the car, popped the hood and filled coolant on the expansion tank, ran the car like always, when i was driving on the highway, the car started feeling out of power and out of nowhere the temperature climbed up to 100C, i stopped as soon as i could, opened the hood, slowly opened the expansion tank cap expecting to see boiling coolant but...nothing, the coolant was cold and up to the top just like i had left it, so the water pump had gone out was my 1st tought, and i was right.

This next part was a long time coming i knew it but oh well, off to the shop of a friend of mine, he would be working on the car on his time off, and i would help when i got off work. Took the motor out of the car since we would resurfacing the head and because it took some heat i tought it best to resurface the block as well. They had to take 0.50mm off the head because it was warped.

Here is the pic of the damaged headgasket, because of that it burnt 2 valves and, i cant find the pic of the waterpump but it was gone completely, there was no propeler, only a tiny bit of shaft.

Don't miss the next post, i will talk about the rebuild!
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File Type: jpg 20170401_102913.jpg (62.3 KB, 9 views)
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#2 Old 06-06-2017
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Continuing, got the head and block back from the machine shop where the 2 valves were replaced, valves were seated, the seals for the stems put new, the whole deal.

In the mean time i cleaned all the parts that were taken off the car, brackets, mounts, ancilliaries etc, because all the years take a toll and the gunk ammounts up to alot.

New gasket kits, new head studs, water pump, thermostat, all the belts, and replaced some rubber hoses that were cracked or worn. The Mercedes dealership is close to work so i bought some of the stuff there and i was surprised by the prices, some stuff was really cheap, the only thing i think was way too expensive was the transmission and differential oil, tranny fluid was like 25 per litre, and diff oil was 47 per litre, i had to buy 2 litres of each as they take more than 1 litre to top up, but at least i could rest easy knowing i had the appropriate fluids for important mechanical parts to try and spare them as much as i can.

The only issue we came across while assembly was the damn timming chain gear that does the advance on the intake camshaft, the one that slides in and out via the spring inside, the inside gear was worn near the entrance and they did not want to match at all, so i had to file the entrance of the teeth and use a special compound that when applied to both gears you slide them on eachother and the paste eats away whatever is causing it to not match correctly, after that and all cleaned up they matched smoothly without any play.

With the engine totally put together and inside the car, topped the fluids, the engine oil i use is Petronas 5w40 3000 full synth that i change every 10,000km (6,213mi), topped the coolant.

Time to turn it over and see if it works!!

And it did! on the first try too!

Time to check for leaks, bleed the coolant circuit, all seemed ok. Got it to heat up to normal temp and i notice that its making way too much noise on the head, its coming from the hydraulic touches ( i dont know what its called in english, but its the part where the camshaft lobes hit to push the valves down ) it got me scared thinking they may have been damaged when the car overheated...well the noise died down and it makes sense, they are hydraulic and need to charge with oil so the more the car ran the faster they started to work properly.

Ok off for a ride around the block...

First 10 meters, oil leaking on the ground, a good 2 litres...its coming from the passenger side, next to the alternator, pulled the car back into the workshop. Took the kompressor out, found it! its coming from the tensioner screw, the washer may have not been seated correctly, repositioned it, filled oil and cleaned all the area with degreaser.

Round 2, started up and ran to normal temp, no leaks that i could see, all seemed fine so i went out and took it to the M.O.T center that was 10 minutes away ( since the car was sitting for so long, the period for the mandatory M.O.T had gone by so now it was illegal to drive on the road ). It passed all tests even the CO2 test that i was fearing due to the fact my Catalytic converter is on its way out.
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#3 Old 06-06-2017
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Great job. How exciting. As for English not being your native language, you should see how some of the natives write over here. Yikes.
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#4 Old 06-06-2017
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Originally Posted by Mn car guy View Post
Great job. How exciting. As for English not being your native language, you should see how some of the natives write over here. Yikes.
Well, i try my best, but mostly i learned from school, TV, movies, music and videogames

This weekend i will probably change the oil and coolant, once i see everything is okay i can focus on what i have planned for the SLK.

Im the kind of guy that goes for performance first and visuals second, but don't forget i live in Portugal, wages here aren't the best and everthing car related is kind of expensive and heavily regulated
so here is what i want to do:

Suspension system( seems like it has stock suspension, feels like it), im still not sure if i go coilovers or lowering springs + performance shocks...

Wheels, right now i have original Mercedes Adharaz in 17'', still debating if i go 18'' or get a set of 17'' but something with dish, or a little bit of lip. The problem of going 18'' is i need to get it legalized, as in, pay to have our DMV include that in the car registry. Also, get wheel spacers on the front and the back to give it a more agressive look.

Exhaust, well i know the Cat is gone, so i want to have new piping custom made from the headers on back, straight pipe all the way, and put either a Magnaflow muffler or Vibrant.

Intake, not really intake but more like the Kompressor bit, i want to take it off and recondition it, check the lobes for wear and if all is well, get a smaller pulley to squeeze a little bit more PSI from it

ECU, i got a friend that does ECU tunning and i will take the car to him to tune after i do all the above mods, see what we can come up with. Anything close to 250-260hp and im happy.

After all this, and i know this will take quite some time and , once its tuned i can see where the limitation is, if its fuel or air, and act accordingly.

Here are some pics from the rebuild i forgot to put in the last post. (some are not rotated correctly, i dont know why)

Feel free to give opinions on the mods i have described, and suggestions!
Attached Images
File Type: jpg 20170404_201600.jpg (44.5 KB, 4 views)
File Type: jpg 20170419_182725.jpg (65.5 KB, 7 views)
File Type: jpg 20170419_182743.jpg (44.8 KB, 6 views)
File Type: jpg 20170419_182751.jpg (54.1 KB, 5 views)
File Type: jpg 20170424_184611.jpg (60.1 KB, 7 views)
File Type: jpg 20170424_184652.jpg (62.9 KB, 6 views)
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