Hi all,

I have a Dakota 1992 and I plan to either do an engine overhaul or complete rebuild.
Because I want to work while using the truck, I am planning to get a 3.9 from the junkyard and work on it until ready for transplant.
Now my researches tell me that the magnum v6 3.9 was produced (https://en.wikipedia.org/wiki/Chrysl...num_3.9_L_V6):

• 1992–2003 Dodge Dakota
• 1992–2003 Dodge Ram Van/Dodge Ram Wagon
• 1992–2001 Dodge Ram

Can I consider those other/newer models in my search at the junkyard or something (interfaces, bolt patterns etc.) won't work? Looking for a heads-up.

Thank you.

 

The engines are pretty much the same, there are likely some differences in oil pans between vehicles, and also between 2 or 4 wheel drive. The 98 and up will only have a provision for one coolant temp sensor, your truck should have two. (one for the gauge, one for the PCM.) Using your intake manifold on the replacement motor solves that issue. You will want to check the plenum gasket while you have the manifold off though. They are notorious for blowing out.

 

Thank you HeyYou,

I was thinking of using a smartphone borescope to inspect inside the cylinders... for a general assessment.
Something else you check in the yard to pick the best option?

Thanks again.

 

Lowest reported mileage..... Although, I find it hard to trust the guys at the yard these days...... I have bought 'low mileage' motors, that knocked from the first startup once installed.... If you can hear it run before you pony up the cash, that is best.... though not always possible.

 

The block will be the same.

Heads will be the same.

As long as you don't mind swapping intake and exhaust manifolds, plus I'd use brand new sensors, you can rebuild the "new" motor before dropping it in and make SURE it's in good shape.

That gives you time while the machine work is being done.

I don't recommend it for your Everyday Joe or Jane Sixpack to do ... but one guy who goes by CooperTune over on Dakota Forumz is rebuilding a 3.9 with full blueprinting.

Let me see if the link works here (not all forums let you post links .. )

Warning not for the faint of heart, rated P/G for mature audiences. A 3.9 V6 build looking for 20 HP. | Dakota Forumz

Yay link!

Check out what he's doing for an eyeful of what CAN be done.

RwP

 

Thanks all!

I found other resources helping to "picture" the job more in depth. I leave here in case the references are of interest to anyone else:

1) 5.9L dodge Magnum Engine Teardown - High quality production, in length. General discussion is really interesting eg. (signs of wear, tips for removing heads, tips for proper gasket placements, etc)

2) How to Rebuild a V8 Engine | Dodge 5.9 360 Magnum - Somewhat a complete rehearsal, with torque spec and everything.

From what I see the 3.9 is pretty much along the same lines.

Ok see ya!