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1994 Sanden compressor swap
My stock compressor was good for 26 years. One Oreilly rebuild was DOA,
clutch failed on second after a month, got refund Purchased OEM Delco R4 replacement compressor, only lasted two years before front seal failed. I wanted a better option. The Sanden swap. 7 piston Sanden 508, Dirty Dingo swap brackets and their R4 manifold head. Compressor bolted in with no problems. Purchased new lines. The high pressure line was a few inches to short to reach condenser due to the increased length of new compressor. Cut new and old lines and used a repair fitting good to 600 psi to lengthen the high pressure line. A new belt 3" longer was needed. Pressurized system with dry nitrogen before truck went off to trans shop several weeks ago. When it came back, pressure held. Hooked up compressor wires and jumped out the high pressure cut out that was located in the old R4. Will address high cut out later. Pulled vacuum and charged with the stock 2 lbs. of R134a using my digital scale. New compressor displacement is real close the R4 so I did not see a need to adjust the charge. System works great and is real quiet compared the R4. Hope this compressor is more reliable than current options. I do have to address the heat riser pipe as well. A pressure switch makes the connection difficult. The heat riser is required for smog here in California.
First pic is stock R4
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