3975986CN Cummins 5.9L ISB/QSB Oil Cooler 3"x 9" 3975986CN 1.3/4'' Replacement Part

Commonly used on Cummins 5.9L ISB/QSB.

3975986 Cummins Transmission Cooler 3" X 9" OAL bundle Diameter Oil Cooler CuNi. 3975986 and 3975986CN are the same part, both with a Copper Nickel bundle.

Core length = 6", overall length = 9.5" (tail to tail)

This cooler has 1.3/4" water fittings.

This is a Mr Cool (USA) part MRC3975986CN

Cooler Measurements:

• 3-1/8" Outside diameter
• 10-3/4" Overall Lenth
• ½" NPT Oil Connections
• 1-3/4" Water Connections
• 1/8" NPT Drain port (4 Different Locations)

Our product is a drop in replacement for these part numbers:

• Cummins® :
• 
  
• 3975986
• 3975986CN
• 3972979
• 3972979CN

This part fits the following engines (possibly more):

• QSB5.9L
• QSB6.7L
• QSB5.9 CM850
• QSB6.7L CM2250

This is a Mr Cool (USA) marine part MRC3975986CN