Has anyone read this document ? http://www.schraderinternational.com/~/media/Schrader/Files/Document%20Library%20PDFs/North%20America/AC%20Valve%20Manual_User%20Guide_10-21-13.ashx

I was looking for torque info on Schrader valve cores for AC. Didn't realize there are so many different ones. Does anyone know which core is the one that Mercedes used in the 617.xxx service ports?

"B1.1 Installation torque
Each valve core will have a different installation torque
recommendation because the thread size is unique for
each core. Torque of the integrated valve to its adapter
will be different for the high and low side version.

Std. Core: 0.36 – 0.67 Nm / 3 – 6 in-lbs

JRA: 0.56 – 1.13 Nm / 5 – 10 in-lbs

8mm: 1.13 – 2.26 Nm / 10 – 20 in-lbs

10mm: 1.70 – 3.40 Nm / 15 – 30 in-lbs

Primary Seal (HS): 9.5 – 13.6 Nm / 7 – 10 ft-lbs

Primary Seal (LS): 6.8 – 9.5 Nm / 5 – 7 ft-lbs

All torque recommendations are for dry threads.
If lubricants are used the installer should develop dry
vs. lubricated correlation."

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85 300D turbo pristine w 157k when purchased 161K now
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked

I see no specifications listed in my paper MB AC FSM... they just refer to it as ' service valve' ...

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1980 240d ,

chain elongation, cam marks reference:
http://www.peachparts.com/shopforum/diesel-discussion/10414-help-i-need-check-stretch.html

http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html

evap fin cleaning:

http://www.peachparts.com/shopforum/diesel-discussion/156207-photo-step-step-post-showing-w123-evaporator-removal-1983-240d-1982-300td.html?highlight=evaporator

A/C thread

http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html

Maybe this will help:

Image Gallery

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Sam

84 300SD 350K+ miles ( Blue Belle )

I'll just add that there are different Schraeder valves that physically can be screwed in, but would cause issues. Most common are for auto & bike tires, and I think they interchange. AC ones have special rubber for R-134A. The ones in the tip of a compression gage must have a very weak spring so they pop open easy to not affect the pressure reading, they usually have a white ring. I tighten all finger tight, using the special tool (~3/4"D handle), maybe 2 ft-lbf.

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1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans

Pic shows 5 different ones. Which one(s) are used in the 617.xxx? Are high/ low sides different? I'll pull the ones in my old lines and take some pics/ measurents

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85 300D turbo pristine w 157k when purchased 161K now
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked

I think if you pulled the ones from your old lines, you should be able to match them up. From what I can tell, the differences are noticeable.

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Sam

84 300SD 350K+ miles ( Blue Belle )

I never went so crazy with the torque specs on the different sized schraders, remove, replace and tighten with my little santech tool, one end does standard tiny ones the other end can handle JRA, GM8 and 10mm. - New schraders are always a good idea when servicing a unit.

The valves can be had at oriellys for about 10 dollars a baggie of 8, the tool I got from ebay for about 8 dollars. The orielly baggie would have standard, JRA and 8mm. They also sell a small blister pack of standard cores with caps and their tool for about 5 dollars.

The only port I abhor is the ball loaded one similar kind is also found on some mercedes low side too.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)

std core...

the others are for various R134 fittings...

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

+2. I just do finger tight it plus may be another 1/4 turn at most. Space shuttle system, may be. Auto, No.

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Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed.

W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html

1 X 2006 CDI
1 x 87 300SDL
1 x 87 300D
1 x 87 300TDT wagon
1 x 83 300D
1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry.