When converting these cars to R-134, my only problem has been the v-belt.
This problem was solved when i went to use the OEM belt manufactured by Contitech. Problem solved.

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DDC/MTU....Setting the pace
1985 300cd
1983 300d...aka "The Yummymummymobile"....Wifes ride
2006 Wesmac 38' Sportfisherman, Single DDC/MTU 12V-2000 1500 hp