Motor swap from 03 liberty - Jeep Commander Forums: Jeep Commander Forum
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post #1 of 8 (permalink) Old 05-21-2017, 05:42 PM Thread Starter
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Motor swap from 03 liberty

Hey I was looking at getting a motor for my 06 commander. I found a 3.7l out of an 03 liberty and wanted to know of it would fit in my 06 with little to no mods to do it? Any input would help

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post #2 of 8 (permalink) Old 05-22-2017, 07:46 AM
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Originally Posted by 2629thompson View Post
Hey I was looking at getting a motor for my 06 commander. I found a 3.7l out of an 03 liberty and wanted to know of it would fit in my 06 with little to no mods to do it? Any input would help

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The short answer is No.

Beginning in '05 Chrysler changed the computer systems used from JTEC to NGC; the only difference (though it's a big difference) was to the timing components internal to the engine. There's a timing wheel on the cam sprocket that has to be changed and a "reluctor ring" on the back of the crankshaft that has to be changed. All the details are HERE. I swapped a newer 3.7 into my '03 Liberty and had to change both of those components.

That said, ANY Chrysler 3.7 from '05 and newer will work in your Commander - the engine doesn't have to be from an XK. Some of the external components from your current XK engine may need to be swapped over to the donor engine but that process is simply remove from one engine and replace on the other. The 3.7 was used in Dodge, Jeep, Chrysler and Mitsubishi products and there are literally millions of them out there so it's just a matter of finding one at the right price with the lowest possible miles.

Hope this helps...


Bob

2006 Limited, 5.7 Hemi, Tow Package, SuperChips tuner, Full Skids, RER MyGIG Upgrade. OME HD Springs w/ Bilstein 4600 shocks
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post #3 of 8 (permalink) Old 05-22-2017, 07:48 AM
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Your best bet is to try and get the same year and the same vehicle motor. If that is not possible then I would call a good salvage yard and ask them which motors are compatable, usually the 8th digit of the vin is the motor and it can come out of something else as long as the 8th digit is the same.

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post #4 of 8 (permalink) Old 05-22-2017, 02:10 PM
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Join Date: Nov 2016
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Originally Posted by 2010 inferno View Post
Your best bet is to try and get the same year and the same vehicle motor. If that is not possible then I would call a good salvage yard and ask them which motors are compatable, usually the 8th digit of the vin is the motor and it can come out of something else as long as the 8th digit is the same.

Swanny

Good point. The eighth digit will be a "K" on Chrysler products with the 3.7L.


Bob

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post #5 of 8 (permalink) Old 05-22-2017, 02:27 PM Thread Starter
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I found a 3.7l out of an 05 liberty with 75k on it. I heard that year would swap with no issues. Is that right?

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post #6 of 8 (permalink) Old 05-22-2017, 02:59 PM
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Join Date: Nov 2016
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Originally Posted by 2629thompson View Post
I found a 3.7l out of an 05 liberty with 75k on it. I heard that year would swap with no issues. Is that right?

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That year should be fine.

To be absolutely sure, remove the passenger/right side valve cover from your engine. The cam sprocket has "windows" stamped in it that the cam position sensor reads. Count the number of windows and the configuration (2 close together, then 3 close together, then another 3, etc.) and then compare yours to the engine you're receiving. The sprockets should be the same.

Here's what the cam sprocket looks like:




Bob
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post #7 of 8 (permalink) Old 06-07-2017, 05:17 PM Thread Starter
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OK thanks. We're the motors the same out of like a 07 or 08 durango or Cherokee?

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post #8 of 8 (permalink) Old 06-08-2017, 08:51 AM
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For the most part the 3.7 in any Chrysler product was the same 2005-2012. Even the Mitsubishi raider of the same era had a 3.7 Chrysler.

The block and heads have a few internal changes for stuff like oil flow and the ground points are better designed on the newer blocks but it's all just about the same far as bolt up is concerned .



For our 06 commander we got a low mileage 3.7 from a 2012 liberty, a few sensors to swap and the oil pan. Very straight forward just use your intake and exhaust manifolds. I think 2007-08 they add EGR valves, don't worry about that, just use your original exhaust manifolds since they don't have the passage ways for EGR and it's all good.

The junkyard Hollander interchange is wrong about which years are usable, its mostly just swapping a couple of sensors, the oil pan to be correct for the commander. Oh, the oil filter changes late 2008 or 9, I just use the filter that matches the year of the new motor. Minor stuff really.

There are a few tips on the swap for the commander, the factory Service manual
skips a few steps and misses a few tricks. Most time consuming part for me was getting the exhaust bolts to the down pipe off, the nifty self locking nuts Chrysler used spun freely and were difficult to access to put a wrench on . Over all of a lot of work as you'd expect but not a job I'd shy away from.

BTW twoBobs knows his stuff on this motor, if in doubt listen to him.


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