Question1997 Ford F150 4.2L V6, 5SPD manual 127,000 Miles.
Pulled the plugs and found antifreeze on the #2 plug.
The engine was knocking loudly and steam coming from the exhaust. Possible damage: Head gasket and/or Timing Cover Gasket. Broken/spun rod bearing.
I've researched the antifreeze leak problems for the 4.2L V6 on numerous web sites and this seems to be a common problem for these engines.
Here's my questions:
a) I talked with a local salvage yard today and they said you can use a 97 or later Mustang 3.8L V6 SFI Engine that was mated to a 5 Spd manual transmission, to replace the 4.2L?
This what is needed for the swap: 3.8L Intake, Flywheel and the engine.
They said the computer, wiring harness, 5SPD transmission and everything from the F150 should connect/bolt up.
b) Isn't the 4.2L a stroked 3.8L?
c) The 4.2L used engines with 100,000 to 160,000 miles are going for $ 1,600.00 < > 1,900.00 for a complete engine.
(If you can find one)
The used 3.8L including intake and flywheel are going for $800.00 < > 900.00 for a complete engine.
d) Remanufactured 4.2L are going for $ 1,400.00 < > 2,800.00 for a long block w/36,000 mile warranty.
This is a little steep for a remanufactured stock truck engine!
Just wanted to know if you had heard of anyone swapping a 3.8L for a 4.2L?
Looking for alternatives about the engine.
Thanks for your help,
Chuck
AnswerChuck-
I've not heard of anyone swapping a 3.8L in place of a 4.2L motor, but I think it'd be a bit harder than just the usual swap pieces. Primarily because, to my knowledge, F-150s never came from the factory with 3.8L motors and I believe 4.2L motors come from a different engine family rather than simply being stroked versions of the 3.8L. That being said, I'm certainly no authority on truck motors, especially V6s. I'm sure the reason the 3.8L motors are cheaper is just supply and demand...the 3.8L found it's way into everything from Mustangs to minivans to Tauruses. The 4.2L wasn't quite as popular. The main issue you'll be looking at for the swap to work is how the engine will mount. I'd recommend finding a car that originally had a 3.8L in it and measuring it's mounting points (make sure it has no front end damage, though). This isn't definitive, but it'll give you an idea of what you're working with. The mounting is much more important than the computer and wiring since that can be transfered to virtually any car whereas things like the K-member (or engine brace) cannot. An easier swap might be a 4.6L motor since those did come factory in F-150s and, again, are found in many other vehicles so the price shouldn't be terribly high. Hope this helps.
Steve
