> Tomorrow is 1/2 price day at P-N-P. I was going to pick up an A/C compressor > or three. > Can I pull any GM R4 and change the manifolds to fit the Mercedes? > > Rick >
On May 23, 2012, at 8:57 PM, Dieselhead wrote: > Nope > MB only. Reports are: if you use a gm unit, it does not get lubrication, > and burns up the bearings. My understanding is that the MB unit hangs upside > down from the GM unit. (no personal experience) This point has been debated to death. The 'upside down R4 will not last' is an Internet phenomena that is often repeated with slim factual support. Swaps have been made for decades with perfectly acceptable results. Theory is the small hole or X (if there is one) on the front should be up. Oil splashes around and collects in the hole - it then drips down onto the shaft, lubricating the bearing and seal. A GM compressor can be reclocked to maintain this orientation as desired. There is enough evidence to my mind that this is not required for a long lived R4. Some newer designs don't even have this 'feature'. Keep the correct amount of oil in the system at all times. If you have a freon leak, make sure your oil levels are maintained when you recharge. Run the system monthly to maintain lubrication. The oil miscibility of the freon in an R4 may be more important than in other designs but that does not mean a GM R4 will not work on an MB. Dave SoCal - '82 240D (3 pedal), '84 300TD (Euro), '85 300TD (Cali) _______________________________________ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
