Quote:
Originally Posted by ROLLGUY
R4 is a "Radial" 4 piston compressor, thus the R4 designation...
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Thanks for clarifying. I should have remembered since I now recall taking a failed R4 apart long ago to see, and to scrap the aluminum "block". It was likely the one where the clutch slipped and smoked, and perhaps a piston seized in a bore, as in my Denso. I just recall it happened on a very hot day (which Rollguy also experiences). The main thing is that it has no oil sump, so relies on oil circulating in the system. At least in our cars, the R4 is down low where oil tends to stay.