Author Topic: Pulleys required to uninstall aircon 280SL  (Read 812 times)

Coops

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Pulleys required to uninstall aircon 280SL
« on: October 04, 2021, 17:03:39 »
Does anyone know where I can source the two pulleys to uninstall the air con on a 1968 280 SL. I have pulleys and belts that go in all directions, I would like to simplify the installation. I need one fan pulley aligned with the first position of the crankshaft pulley and one crankshaft pulley with two pulley slots first position 9.5 mm belt and last position 12mm belt for power steering. I believe these pulleys are NLA from Mercedes?
Martin Cooper
US. Silbergrau 280 SL 1968
Mèze, France

Coops

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Re: Pulleys required to uninstall aircon 280SL
« Reply #1 on: October 04, 2021, 17:09:18 »
Additional photo of pulleys
Martin Cooper
US. Silbergrau 280 SL 1968
Mèze, France

dirkbalter

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Re: Pulleys required to uninstall aircon 280SL
« Reply #2 on: October 05, 2021, 01:33:07 »
Why don’t you leave the pulleys in place and just take the AC out if you don’t like it?
Is your fan pulley a double one?
Dirk
66 230 SL
70 280 SEL
18 C300 COUPE
05 HD FLSTNI

Coops

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Re: Pulleys required to uninstall aircon 280SL
« Reply #3 on: October 05, 2021, 08:33:20 »
Thanks for taking an interest. there is the solution of doing it like the diagram, but that still leaves the horrific metal bracket a spare idler pulley and the alternator in its high position and powered from the water pump ? And two 12.5 mm belts that are non standard length and there without reason. If I am going to do it I would like it to be as original as possible.
Martin Cooper
US. Silbergrau 280 SL 1968
Mèze, France

Coops

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Re: Pulleys required to uninstall aircon 280SL
« Reply #4 on: October 05, 2021, 08:45:19 »
Current situation showing pulleys (nightmarej
Martin Cooper
US. Silbergrau 280 SL 1968
Mèze, France

Shvegel

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Re: Pulleys required to uninstall aircon 280SL
« Reply #5 on: October 05, 2021, 09:00:50 »
The water pump pulley is a single groove pulley that mounts on the short water pump directly, then a spacer then the fan.  That will get you back far enough to get the crank pulley you have and the alternator pulley into the same plane.  You may already have the short water pump with the spacer under the pulley.  If not you will need the short pump and a spacer as well.  You should be able to just disregard the center groove or sheave in the Crankshaft pulley and the Power steering belt goes back as before.  Your water pump pulley is quite valuable to anyone installing AC on their car.  They are quite hard to find.  The pictures are of an early M130 like your's.

Coops

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Re: Pulleys required to uninstall aircon 280SL
« Reply #6 on: October 05, 2021, 15:05:04 »
Thanks, I think I understand, apart from the fact that the first two grooves on the crankshaft (ie. nearest the engine) are for a 12.5 mm belt the two water pump grooves nearest the engine are the same 12.5 mm the alternator pulley is 9.5 mm ? I have even wondered about having an alternator pulley machined to take 12.5 but not sure if there is enough material!

Regards Martin
Martin Cooper
US. Silbergrau 280 SL 1968
Mèze, France

dirkbalter

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Re: Pulleys required to uninstall aircon 280SL
« Reply #7 on: October 06, 2021, 03:02:28 »
Not sure if it helps but my alternator pulley is 9.5mm. On the crank, the pulley is part of the damper. The power steering is a 12.5 mm belt / pulley. The pulley (crank) is either a single or a double (AC). It shouldn’t really matter, if you don’t use AC , you can just leave that blank.
Dirk
66 230 SL
70 280 SEL
18 C300 COUPE
05 HD FLSTNI

johnk

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Re: Pulleys required to uninstall aircon 280SL
« Reply #8 on: October 06, 2021, 11:30:05 »
The three groove pulleys are an expensive upgrade for someone who wants to install AC.  You should be able to trade and put cash in your pocket.
John Krystowski
Avon Ohio
1968 Euro 280sl under restoration
2016 Jag F-Type R sold june 2021
1950 Alfa Romeo 6C 2500 SS For sale
2008 E350
2007 GL 450
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ja17

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Re: Pulleys required to uninstall aircon 280SL
« Reply #9 on: October 06, 2021, 12:17:52 »
Single alternator pulleys are readily available. I'm thinking the alternator pulley on the crankshaft is part of the vibration dampner also and it must be changed.
Joe Alexander
Blacklick, Ohio
1969 Dark Olive 280SL
2006 Mercedes Sprinter Van
2002 ML55 AMG (tow vehicle)
2002 SLK32 AMG (350 hp)
1982 300TD Wagon turbo 4spd.
1963 404 Mercedes Unimog (Swedish Army)
1989 flu419 Mercedes Unimog (US Army)
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boterinse9

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Re: Pulleys required to uninstall aircon 280SL
« Reply #10 on: November 29, 2021, 02:00:34 »
Hi   When you are that far into the ac removal dont forget your idler adjuster pully I did the same and then the bearing seized up so  had to go back in and start over  the bearing was only a few bucks parts and labor and your good for many more miles.
1970 280 SL Silver Automatic

1976 300D White

2012 C300 4matic
2004 chevy Silverado