A/C System Oring Sizes

[digger]

I did some research and the genuine bmw ones seem to be both green and grey depends on pn/size? Surely bmw are selling r134a compatible orings ?

am I safe use genuine ?

[tomstin]

I believe the green O-rings are for R134A

[digger]

whats the go with o-ring material? for a R134a converted should they be the green ones or silvery ones? or doesnt matter?

[rcko]

O-ring info from e30tech.com

The A/C system is built with SAE sized hoses and connections.
BMW lists o-rings by I.D. in mm, vs standard sizes or dimension
Thus a #6 o-ring, which is 3/8" or 9.525mm, is listed by BMW as 7.64mm

Expansion valve and evaporator, 17/19/22/24mm wrenches
One 7.64mm #6
Two 11.1 mm #8 x 1/16" I.D.: 11.1mm O.D: 14.3mm T: 1.6mm
Two 14 mm #10 x 1/16"
(Fifth o-ring is for the superheat adjustment plug)
ETK lists 11.1 and 14mm (602/603) for evap side of exp valve
Compressor
64-50-1-468-464 11.1mm for outlet (see high pressure hose)
Either
64-50-1-468-466, 17mm (19x17mm) (3/4", #12) for Bosch inlet
or
64-50-1-468-465, 14mm (#10) for Denso inlet
Condenser
64-50-1-468-464 11.1mm for inlet (high pressure hose)
64-50-1-468-463 7.64 for outlet (hose to drier), 17/19mm wrenches
Drier
64 50 8 390 601 Two 3/8" (#6) o-ring for tube fittings
64 50 8 390 602 One 1/2" (#8) o-ring for pressure switch
Note: For two pressure switch drier only. Switch with wire leads
is pipe threads, pronged switch is o-ring sealed. New style drier
uses a combined pressure switch with a Schrader valve connection.
Firewall
Liquid connection 17/19mm wrenches
64-50-1-468-463, 7.64mm (3/8", #6)
Vapor 24/27mm wrenches
64-50-1-468-465, 14mm (#10)

O-ring count: 5X #6, 5X #8, 3X #10, 1X #12
64-50-1-468-463, 7.64mm (3/8", #6) new part number for '601
2@ drier, 1@ tube connection, 1@ E.V., 1@ condenser outlet
64-50-1-468-464, 11.1mm (1/2", #8) new part number for '602
1@ drier switch, 2@ E.V., 1@ compressor, 1@ condenser inlet
64-50-1-468-465, 14mm (#10)
2@ E.V., 1@ tube connection, 1@ compressor suction (late compressor)
64-50-1-468-466, 17mm (#12)
1@ E.V., 1@ compressor suction (early compressor), 1@ Bosch manifold

[rcko]

buy the conversion kit, it will have all the o-rings you will ever need.

whose? Got the name of a vendor and or part number?

thanks

Registered to E30 tech.. waiting on their email confirm to read the article...

[87-325ic]

i believe this is more than youll ever need..

http://www.e30tech.com/forum/viewtopic.php?t=37884

[T.Dot_E30]

buy the conversion kit, it will have all the o-rings you will ever need.

[rcko]

I been swapping an engine in my 88 325is and while I am at it decided to get the a/c system back running. I have managed to find all the necessary hoses, condenser, evaporator, compressor, etc but now need to figure out what size o-rings go with what connection. The local dealer has not been of much help, instead interested in selling me a complete conversion kit...

Any one has this info handy? realoem had a few oring sizes but not all.