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I installed AC when rebuilding the car (this is in Sweden where literally no 240's have got original AC) and of course used R134 since all the parts had been on the floor anyway and R12 was forbidden in 1996 or so. But even though the return line gets freezing cold (snowy!), the air doesn't seem to get REALLY cold and that's why I'm asking about the expansion valve which I didn't change. The compressor and condensor are newer 900/700 parts and the heater valve (new style) ok.
The bearings are standard dimension (8 mm inner dia), for some reason often labelled 608 and available from severable manufacturers such as SKF, Toko and a german brand I can't remember. There are sealed and open types available, I guess the sealed ones are right on spot for this purpose.
Installing the bearings is simple - use a bench vise (vice in UK?) to remove the old bushing, spring and cover plate from each end of the motor housing. The new bearings are 22 mm (outer dia) and the housing ends 24 mm (inner). I used a strip of 1 mm sheet alloy to reduce the diameter at each end and then the vise again, you choose method by yourself. Wrench sockets will act like fine distances in this work. Finally, the axle will need some polish or sanding with a VERY fine grade paper. The bearings don't have to sit that tight - just enough not to play around. To tight will give you trouble when trying to disassemble or adjust the shaft location axially.
There was actually no problems performing this conversion and considering the time required to get to the motor, one or two hours more doesn't matter. A problem not related to the bearings, anyway, is worn commutator (and brushes) - not that easy to fix and you of course want the motor to last 'til the end of time'. I sorted mine out of three to get a fresh one...
/Martin
73 165E
65 121 4d
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