Rebuild 3.9 or purchase 4.6? - Defender Source
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  #1  
Old November 17th, 2015, 02:31 AM
peteyourmeat
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pete
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Rebuild 3.9 or purchase 4.6?

Hi, I'm a new member and this is my first post. Really would appreciate some help. I recently purchased a 1995 NAS Defender 90, she had been sitting for many years and the transmission was locked up and the motor needs a fresh start. i was thinking of rebuilding the 3.9 or purchasing a already rebuilt 4.6 long block from a land rover parts distributor. Does the 4.6 bolt right up with exsisting 3.9parts or am i opening a can of worms, ie; ecu, bigger injectors.....Any advice would help, Thank you
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  #2  
Old November 17th, 2015, 02:52 AM
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Chris
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The 4:6 will bolt right up. But I would work on the 3.9 you have right now and try to bring it back to life.
Unless it's seized solid
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  #3  
Old November 17th, 2015, 06:07 AM
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How far have you gone in to determine its demise?
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  #4  
Old November 17th, 2015, 06:13 AM
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Bill Adams
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Transmission locked up? Doubt it. I would believe that the transmission brake would be corroded in the on position, but not that the transmission is locked.
The 3.9 is fine. You don't get all that much huge performance gain from a 4.6 to make it worth the effort of a swap. Besides, even if you do find the current engine useless, you can source another good used 3.9 for only a few hundred bucks.
Do a complete tune up with all new belts hoses fluids cap rotor wires plugs. Pretty sure after that it'll start and run happily.
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  #5  
Old November 17th, 2015, 06:23 AM
ezzzzzzz
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Mark Garrenton
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As stated the 3.9 is a good powerplant. You could re-cam it to gain a little umph, if desired, but don't jump into such projects until you know what you already have. It does sound like the brake shoes are frozen to the drum at the transfercase...very common for a vehicle that sits too long. You did not state how many miles are on the truck. Probably not enough to have worn out engine yet. Go through the basic maintenance as Bill said. There will be plenty of other things to spend money on as time goes by.
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  #6  
Old November 17th, 2015, 09:01 AM
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I'm supposed no one said..."drop in a TDI!"

I believe there is more to dropping in a 4.6 than just dropping in a 4.6...
Cooling, ecu...

I don't get why the 3.9 gets such a bad wrap. The 4.6 can suffer the same issues if neglected.
I agree with the others, see what you have to work with first.
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  #7  
Old November 17th, 2015, 09:15 AM
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Ray Gerber
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Quote:
Originally Posted by Grover View Post
I'm supposed no one said..."drop in a TDI!"

I believe there is more to dropping in a 4.6 than just dropping in a 4.6...
Cooling, ecu...

I don't get why the 3.9 gets such a bad wrap. The 4.6 can suffer the same issues if neglected.
I agree with the others, see what you have to work with first.
I think people were just about to start the TDi discussion, or the inevitable 'Just put a Chevy motor in, it will be easy' advice that perpetually comes out too.

3.9's a good engine and likely far easier to get the existing one running then start from scratch with a 4.6 long block (which may/may not be of the same quality).
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  #8  
Old November 17th, 2015, 09:38 AM
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Yes. Try to get running what you have. Surprisingly, rovers that sit usually come back to life fine albeit leaking a bit more than they did when they were parked.
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  #9  
Old November 17th, 2015, 10:04 AM
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I would make sure you have no other issue before dropping in the new motor. It would suck to find out you have ignition or fuel issues after you put in the new motor and need to break it in.

Sometimes cooling system upgrades are required and sometimes they aren't.
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  #10  
Old November 17th, 2015, 10:21 AM
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The other, maybe not so obvious, thing to remember and budget for is your pipe and hose lines (oil, brake, fuel, coolant). These suckers don't like to be neglected or ignored for very long.
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  #11  
Old November 17th, 2015, 10:32 AM
javelinadave
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His location says El Eh so no diesel conversion for him.
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  #12  
Old November 20th, 2015, 09:52 AM
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Jake K.
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4.6 and a remap and you'll be ahead of the game. It's only $$$!
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  #13  
Old November 20th, 2015, 10:18 AM
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Interesting. OP posted message and hasn't been back since.
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