Reattaching main vac line to vac pump - PeachParts Mercedes-Benz Forum

New2MB · #1 04-05-2012, 08:17 PM

I removed the hard plastic vacuum line coming off my vacuum pump and now I'm going to reattach it. I was surprised that I didn't find anything while searching, is it a mistake to remove this line or just so easy to do that no one asks?

Anyhow, I was thinking of using a heat gun (for removing paint) to heat the end of the tube and then just push it over the nipple on the vacuum pump.

Sound like a good plan or might it leak?

This is my '87 300SDL.

sleepstar · #2 04-05-2012, 08:34 PM

the 87 must be drastically different from the 81 because mine has a screw on fitting. the fitting is permanently attached to the hose and screws onto the top of the vacuum pump. what's yours like?

Phillytwotank · #3 04-05-2012, 08:34 PM

You didn't just unscrew it from the fitting on the pump?

Diesel911 · #4 04-05-2012, 09:29 PM

I replaced my Main Vacuum line Plastic Tubing with Rubber Emissions Hose and made it longer an ran it along the Fender Well.
That way I am not likely to Crack it as I did with one of the Nipples when I did my first Oil Change.
Now the Hose is not as much in the way as it used to be.

mach4 · #5 04-05-2012, 09:33 PM

Quote:

Originally Posted by New2MB

I removed the hard plastic vacuum line coming off my vacuum pump and now I'm going to reattach it. I was thinking of using a heat gun (for removing paint) to heat the end of the tube and then just push it over the nipple on the vacuum pump.

I tried that on my '85 617 and got absolutely nowhere. It didn't soften a bit. I ended up just cutting off the hard plastic hose and using 3/8" power steering hose. A lot cleaner and easier, and the pliable hose makes routing the line easier and less likely to break off a nipple on the check valve or dislodge a vacuum line.

New2MB · #6 04-05-2012, 10:23 PM

Well damn I'm sure glad I asked, that would have been a complete waste of time.

Thanks for the tips guys, I'm gonna go with a soft hose end to end.

mach4 · #7 04-05-2012, 10:42 PM

Quote:

Originally Posted by New2MB

Well damn I'm sure glad I asked, that would have been a complete waste of time.

Thanks for the tips guys, I'm gonna go with a soft hose end to end.

Be careful cutting the plastic check valve as it's easy to break off the nipples and gouge the barbs. I recommend a new blade in a box cutter and cut little slivers of the plastic off until it comes free.

New2MB · #8 04-05-2012, 10:57 PM

Thanks, I was wondering about that, the end at the vac pump was a pain to get off.

I'll be nice and gentle.