What year of engines will swap into my 91???
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Junior Member
Joined: Dec 2010
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What year of engines will swap into my 91???
Hey every, i own a 91 F150 4x4 5speed 302 and have terrible problems with it. i recently bought it for dirt cheap but i believe it needs an engine swap or rebuild. it has 135k miles on it and the oil pressure drops off the gauge after about 10mins of driving. I believe there is very little compression in it and it struggles to accelerate in 4th and 5th gear.
I purchased an oil pressure today from Autozone to manually test the pressure but im about 95% sure this engine is done for. It started smoking really bad under the hood when i was less than a mile from home.
I was wondering what year of engines would swap directly into the truck. I believe an 87-91 were the years but will a 92 or newer engine swap directly in? also, would this affect my transfer case since its an on-the-fly shifter (i believe thats what its called) and i believe that later year models have a push button shifter??? Correct me if im wrong or add anyone pointless information you want, ill read it all
i don't have much experience with trucks/cars but ive rebuilt a million dirtbikes/ATV engines so you can throw anything at me
I purchased an oil pressure today from Autozone to manually test the pressure but im about 95% sure this engine is done for. It started smoking really bad under the hood when i was less than a mile from home.
I was wondering what year of engines would swap directly into the truck. I believe an 87-91 were the years but will a 92 or newer engine swap directly in? also, would this affect my transfer case since its an on-the-fly shifter (i believe thats what its called) and i believe that later year models have a push button shifter??? Correct me if im wrong or add anyone pointless information you want, ill read it all
i don't have much experience with trucks/cars but ive rebuilt a million dirtbikes/ATV engines so you can throw anything at me
Senior Member
Joined: Nov 2006
Posts: 5,495
Likes: 7
From: Memphis, TN 38135, USA, Earth
Nothing you've posted so far indicates the engine is beyond repair, or even in bad shape. My engine has over 400Kmi, and still runs strong. The '88 5.0L I put into a friend's truck had more miles on it than yours when we pulled it out of the junkyard, and it runs perfectly.
The oil gauge is a fake, and the switch that controls it is known to fail that way. Read this caption & the links in it:
Why exactly do you "believe" compression is low? Read this:
Smoke can come from any of the fluids in the truck, or anything that splashes up from the road, so again: it means nothing until you ID the source. If the engine is too dirty to spot leaks, wash it. I prefer Gunk Engine Brite (not the foamy version) - read the instructions on the can. It may take several cans & several washings, but doing it at a car wash will speed up the process. Just don't blast the distributor or vacuum lines, or be prepared to dry it out before you try to start the engine.
There's a VERY wide range of engines that will fit, depending on how you do it. The 302ci/5.0L short block didn't change significantly over its production run (ending around 2001), but I certainly wouldn't put in an older engine. Any EFI short block or long block would be OK & fairly easy, but the '98-up Explorer/Mountaineer 5.0L complete engine would be a real upgrade, if you also transfer the wiring & computer with it. For that matter, virtually ANY engine will fit in that engine bay; even a V10 or diesel. Check this out:
The oil gauge is a fake, and the switch that controls it is known to fail that way. Read this caption & the links in it:
Why exactly do you "believe" compression is low? Read this:
Smoke can come from any of the fluids in the truck, or anything that splashes up from the road, so again: it means nothing until you ID the source. If the engine is too dirty to spot leaks, wash it. I prefer Gunk Engine Brite (not the foamy version) - read the instructions on the can. It may take several cans & several washings, but doing it at a car wash will speed up the process. Just don't blast the distributor or vacuum lines, or be prepared to dry it out before you try to start the engine.
There's a VERY wide range of engines that will fit, depending on how you do it. The 302ci/5.0L short block didn't change significantly over its production run (ending around 2001), but I certainly wouldn't put in an older engine. Any EFI short block or long block would be OK & fairly easy, but the '98-up Explorer/Mountaineer 5.0L complete engine would be a real upgrade, if you also transfer the wiring & computer with it. For that matter, virtually ANY engine will fit in that engine bay; even a V10 or diesel. Check this out: