864395T01 Mercury Mercruiser Heat Exchanger

• Offered is our replacement for the Mercruiser 864395T01 Mercruiser Heat Exchanger   This includes the heat exchanger, end caps with gaskets and zinc.  This part is made with OEM equivalent materials and is guaranteed for fit and function.  

• There are two configurations:
  • Currently we show two different configurations of this base part number 864395.  One has a hose and one does not have a hose. 
    • See picture 2 on this ad.  Functionally the 2 configurations are equivalent.  But they are not always interchangable as the hose sometimes gets in the way of the belts and the pulleys if you have a non hose version.  Non hose can replace a hose version, but we wouldn't recommend a hose version for a non hose version of this part.
  • THE AD YOU'RE LOOKING AT NOW HAS THE HOSE
  • If you want the part without the hose 864395T Mercruiser Heat Exchanger

• • As far as function:
    • WITH HOSE:  the hose drains a full surge tank into the inbound glycol circuit to the recirculating pump.   
      • There was an engineering change at Mercruiser a while back to add a hose that runs from the surge tank to the glycol / Fresh Water return fitting and it works great.  We think the hose may have been removed as part of a cost save.
    • WITHOUT HOSE: the glycol is drained from the surge tank (the upper tank in the pictures) via drains under the surge tank that you can't see.

• This part is a drop in replacement for the Mercruiser heat exchanger 864395T01 and other parts listed below. No modifications are necessary for installation.   
• This heat exchanger is a front mount (mounts over engine circulation pump) and works for models from 4.3L to 6.2L. 

Some details to note:   

• Surge Tank Configuration   
  • This heat exchanger tank will not be flat on the top. But it still has adequate surge tank volume and we guarantee it will not impinge on any of the enclosures that the engines are found in.  
• Pad for Air Pump
  • Our parts have the pad for the air pump.  Yours may not have it.  The earliest versions of this part do not have the pad for the air pump. If you have the pad that is used to attach your air pump, our heat exchanger pad and threads are in the same relative location and will allow you to attach the pump.   It's visible near the zinc in the pictures.  As stated some earlier models may not have that pad. If it's not on yours, don't worry about any impact on function. Please note that the threads on this pad do not go through to the tank. They are for mounting the air pump only.   They have no other function. 

Part Numbers that this part replaces:

• Mercruiser 864395002
• Mercruiser 8643951
• Mercruiser 864395A1 Kit (heat exchanger only)
• Mercruiser 864395A03 Kit (heat exchanger only)
• Mercruiser 864395T01 Heat Exchanger (current model)
• Mercury 864395002
• Mercury 8643951
• Mercury 864395A1 Kit (heat exchanger only)
• Mercury 864395A03 Kit (heat exchanger only)
• Mercury 864395T01 Heat Exchanger (current model)

Engines that this part goes on (this heat exchanger fits a lot of engines).  It is used for everything from the 4.3L to  the 6.2L to the 383 stroker.

• 350 MAG 6.2L HORIZON MPI MIE
• 350 MAG MX 6.2 HORIZON ALPHA AND BRAVO
• 357 HORIZON INBOARD REMAN AND BOBTAIL
• 383 MAG STROKER
• 4.3 CARB ALPHA AND BRAVO
• 4.3 MPI ALPHA AND BRAVO
• 5.0 MPI ALPHA AND BRAVO
• 5.0 MAG MPI 350 377 STERNDRIVE
• 5.7L MPI MIE
• 6.2L MPI MIE