Your stuck with a 4.0 unless you do a lot of work to put in a 5.0. Most any Ford 4.0 will work you might have to change some equipment and emission components, to match you system, but your stuck with FoMoCo for an engine. Ford and Mercury are both the same 4.0 HTH
The 4.0 if properly serviced is a pretty good engine.
Ford 4.0L SOHC well know lots of timing chain issues. Ford issued a TSB for the timing rattle problem and released a redesigned “‘cassette”‘ (the timing chain, gears, guide and tensioner assembly) for the left front timing chain. Do this on any replacement engine 2004 4.0 SOHC
If you purchase a reman engine, specifying the year of manufacture, it will be a drop in. If you obtain a 4.0 from another vehicle, besides needing to take other items along with the engine, you will require a PCM update.
I don't think the 4.0 SOHC is entitled to be called "pretty good" at any level of maintenance. It has major design flaws not the least of which is the incredibly stupid timing chain set-up. I have a hole in my block now and it really sucks. My best bet to evidently replace it with what I can. Why is it that 8 of 9 Fords I have owned have died suddenly from either big engine problems or the tranny giving out. I don't drive hard and I maintain better than most dealers will. I'm thinking that although I love buying american that my next car will be Japanese.
Can a 06 ford explorer motor fit into a 04 ford explorer?
Yes, same V6 engine.
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