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Explorer, Sport Trac, Mountaineer & Aviator 1991-1994, 1995-2001, 2002-2005, 2006-2010 Ford Explorer

Engine compatibility

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Old Oct 28, 2003 | 08:43 PM
  #1  
Evicerate's Avatar
Evicerate
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Engine compatibility

For a lay person could someone please explain why a 4.0L SOHC engine would not go into an Ex that originally had a 4.0L OHV engine.
I realize that to some this may be a dumb question, but I figure if I learn something it's worth a shot.
 
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Old Oct 29, 2003 | 10:10 AM
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From: Fort Smith
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Are you asking if it will fit, or if it is interchangeable?

Yes, it will fit into the Explorer - no problems there. You have to change a few things in the process though - not just the engine itself. PCM, engine mounts, wiring harness, heater box place (I think), etc.

No, it is not interchangeable in the sense of a 'plug and play' thought. The OHV has different controls and computer sensing than the SOHC.

Someone else might get into more specifics. Are you wanting to change over?

 
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Old Oct 29, 2003 | 02:19 PM
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Don't forget the transmission. SOHC models have 5 speed automatic as opposed to 4 speed in OHV and V8 models.
 
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Old Oct 29, 2003 | 04:22 PM
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Some of the later OHV engines have the 5r55e. I have the 5r55e in my 98 and I have the OHV 4.0.

As far as trying to change engines, it doesn't pay off if you don't do the work yourself. You would probably be better off selling your current explorer and buying a vehicle the same year with the engine you want. Less money than having a shop swap engines.
 
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Old Oct 30, 2003 | 06:36 PM
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Thanks guys.
I don't really want to change engines or have the $ to do so.
I had just seen someone that bought a SOHC to replace his OHV and sold the new one because it was the "wrong" engine. I was just curious as to why he sold the engine rather than put it in.

I guess the time, changes and PITA factors came into play.

thanx for the responses though.
 
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