Bought a new check valve and shut off valve - Mercedes Benz SLK Forum

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#1 Old 09-21-2012
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Bought a new check valve and shut off valve

Finally got the parts in today! Not to bad of a job, took me about 30mins to do!
1.Start by getting all the tools you need for the job! (the special crimp tool is not needed, you can replace theses fittings with regular hose claps!)

2. Take the bottom hose clamp off that goes from the air flap actuator to the cast inter-cooler. (use a 7milmeter socket or flat screw driver your choice!)

3. Take the other hose clamp off that is over by the check valve

4. Take the clips off of your air box, disconnected your air flap, and wiggle your hoses lose, there is also a small hose that connects to the valve cover, take this off at the air box, also pull up on the bottom half of the air box and it should pull right up for extra space!

5. Start unclipping the clamps, you can do this by a small pick or side cutters.

6. Once clamps are loosened, wiggle, twist, do whatever you need to to get the hose off the shut off valve and the check valve. NOTE: be VERY careful about the vacuum hose...Like mine if you bend it the slightest bit, it'll snap! I had to make some revisions with some hose i had, i will be ordering a new one soon.

7.Once you have your shut-off valve in your hand, start buy taking the check valve off. If yours was rusted like mine was it will be very difficult. I used the torch and heated up the part and it finally broke loose.

8. I put some anti-seize on the check valve so it would go in there nicely tightened it up.

9. Connect the hose with the new shut off valve and clamps.

10. If you use hose clamps, simply tighten them, since i had this fancy tool, I used it, worked out well

11. Throw the air box back on, reversing steps 2-4 and there you have!

As you can see in the pictures some of the rubber fittings were badly cracked, i replaced them

Also once i got the parts fitted, i had to cut open the other two to see how they worked! (yes I'm THAT guy, i have to educate myself to see how things work) Pretty cool actually, once the check valve gets enough pressure, it lets air through to....who knows what! For the shut-off valve it stays shut until vacuum pulls it up and lets air through.

Hope i helps some people out....If i am 16 and i did this all by myself with NO help, while my dad was at the airport doing an annual on his plane, than you can do it! Confidence!!!!
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Last edited by Bradley61496; 09-25-2012 at 10:55 PM.
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#2 Old 09-25-2012
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Last edited by Bradley61496; 10-01-2012 at 05:40 PM.
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#3 Old 09-25-2012
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Here are the last two!
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#4 Old 12-09-2012
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my i ask what was the symptoms that made you change them ?
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#5 Old 01-21-2013
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Wow, look at the corrosion in that valve. I bet my 1999 looks the same way if I pulled it out and took a look inside. I have this on my to do list now; it has been over a decade and the car has the original part still installed. There is no way it is operating at optimum performance levels. Time for a change!
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#6 Old 08-07-2013
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Bradley61496,

Could you tell me where the vacuum line from the shut-off-valve connects to on the switch-over-valve?
I cannot tell from your picture. Thanks in advance!
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#7 Old 08-07-2013
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#8 Old 10-06-2013
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Originally Posted by luap View Post
Bradley61496,

Could you tell me where the vacuum line from the shut-off-valve connects to on the switch-over-valve?
I cannot tell from your picture. Thanks in advance!
Sorry for the lack of communication, it connects to the supercharger.
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#9 Old 02-18-2014
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Is that check valve threaded on? looks like a big hex on it to put a wrench on it. but how did you fit a wrench in there? how exactly did you remove it...???
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#10 Old 02-18-2014
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can you please post the part numbers for those two above.
thanks
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#11 Old 02-18-2014
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Bradley might want your vin number to get you the correct part number for your vehicle


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#12 Old 02-26-2014
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sorry, didn't see it til now
WDBKK65F62F265054
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