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engine swap please help 1989 bronco II
Posted: Thu Jul 19, 2007 9:05 am
by stevesblazer
My friend has a 1989 bronco II 2.9 .. it either has a cracked head or a blown head gasket.

would u rather take the engine apart and put a new gasket in ... or just drop in a new 2.9
and does anyone know about how long it would take (hours

) to swap engines
would u be able to do it in a weekend

Posted: Thu Jul 19, 2007 6:45 pm
by NakedDucks
I wouold recomend a new 2.9. Some have had luck w/ just redoing a head gasket, most have not. The 2.9 casting is rather weak around the bolts...and are VERY prone to cracking there when re-installed
If you bust it, you can do it in a weekend. You will need help, and you need to get along w/ your helper.....
Mine took 4 days cause she got on my nerves.
Posted: Wed Aug 08, 2007 7:49 pm
by Paul
well i know the 2.9 would be faster but i would do the 4.0 swap. the wiring takes some time to work out but in the end it would definatly be worth it, mine has a 4.0 and i am so glad i opted for the 4.0 inxstead of the 2.9 that it had in when mine blew up....... but with the 4.0 and 2.9 swap i did everything just bolted right in no problems, and i actually love driving the bronco II now with the 4.0 installed as compared to the 2.9 i had.........
Posted: Thu Aug 09, 2007 2:56 pm
by NakedDucks
If you do the 4.0 swap into an 89 or 90 B2, then it's a plug and play swap
AS LONG AS you get
ALL the underhood wiring.
Simply remove the 110 pin connector w/ a 10mm bolt in it, and install the 4.0 underhood harness. You also need to go through the firewall on the pass side w/ the 2 rubber grommets...again, remove the 2.9 stuff and install the 4.0 stuff. Use 91-94 for this type swap to work.
But remeber this....91 and 92 4.0's have a
round engine to underhood harness connector and 93 and 94 have a
square one. They don't interchange (Actual square peg/ round hole deal), but are wired exactly the same.

Why they swapped the shape of the connector I do not know