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Old 04-10-2012, 01:03 AM
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Location: Elavil, Ga.
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Expansion valve to orifice tube part 2...

This is for a W116. Last summers adventure can be seen here:

Orifice tube install...

Awesomemobile #2 doesn't have working AC so I'm about to tackle it.

I'm very happy with the OT conversion on my car. I'm getting vent temps in the upper 30's low 40's and the hi side pressures are really low. It was in the 80's today and it was a knuckle freezer in the benz.

Anyway, I'm planning on running an R4 this time and keeping the tube/fin condenser. Hopefully the lower operating pressures with the OT will agree with the R4 more than the throttling action of the TXV. It will also be a lot easier than making a bracket for a different type of compressor.

I swear MB left something out:



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Old 04-10-2012, 09:18 AM
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You going to just gut the expansion valve or fab new hoses?
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Old 04-10-2012, 06:56 PM
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Good idea! On the last one I used a generic 90 deg brass fitting and new hose end. I saved all the old hoses and ends so I can begin work without tearing into the car.

A picture of the new setup:



Here's the old parts:



The evap outlet is a male flare and the inlet is a female. Kind of strange that the 116's use flares on the rec/drier/condenser and at the evaporator while the parts close to the compressor use O-rings. Did they go to all O-rings on 126's?

Notice that the hi side hose is a reduced diameter hose. I think I can re-use the low side hose but I'd need a reduced diameter die to crimp the hi side.
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Last edited by 1980sd; 04-10-2012 at 07:37 PM.
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