Jeep Commander 3.7 Motor Replacement - Jeep Commander Forums: Jeep Commander Forum
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post #1 of 9 (permalink) Old 08-27-2019, 02:35 PM Thread Starter
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Jeep Commander 3.7 Motor Replacement

Hello!

I have acquired a 2006 Jeep Commander with the 3.7.

This machine has suffered the design flaw of a valve seat coming loose. From my research, this seems to be a common enough problem.

So, now I am faced with either changing the heads or getting a remanufactured engine. I would love to know what you guys have to say about it.

My machine shop is very confident in their ability to rebuild the heads in such a way that they are better than new, but the idea of having a completely redone engine is pretty tempting.
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post #2 of 9 (permalink) Old 08-27-2019, 02:41 PM
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Quote:
Originally Posted by Gregory Thornock View Post
Hello!

I have acquired a 2006 Jeep Commander with the 3.7.

This machine has suffered the design flaw of a valve seat coming loose. From my research, this seems to be a common enough problem.

So, now I am faced with either changing the heads or getting a remanufactured engine. I would love to know what you guys have to say about it.

My machine shop is very confident in their ability to rebuild the heads in such a way that they are better than new, but the idea of having a completely redone engine is pretty tempting.
Just looking at it logically, if you have the budget, with 180,000 miles on your current power-train, I'd opt for the rebuilt engine.

I'd also splurge for a new radiator while you're at it.


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Last edited by Big Blue; 08-27-2019 at 02:44 PM.
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post #3 of 9 (permalink) Old 08-27-2019, 02:44 PM Thread Starter
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Quote:
Originally Posted by Big Blue View Post
Just looking at it logically, if you have the budget, with 180,000 miles on your current power-train, I'd opt for the rebuilt engine.

I'd also splurge for a new radiator while you're at it.
Do the radiators go bad on these?
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post #4 of 9 (permalink) Old 08-27-2019, 03:03 PM
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Originally Posted by Gregory Thornock View Post
Do the radiators go bad on these?
That's normal wear & tear 180,000 miles is a lot on the original radiator; If you bought a rebuilt engine, why would you risk running it on a radiator with 180,000 miles of wear & tear on it?

Who knows how many times that radiator may have with stood an over-heating incident, prior to you buying the vehicle.


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post #5 of 9 (permalink) Old 08-28-2019, 12:01 PM
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I agree with Blue. After the amount of work to swap the heads out, I would just look into a full re-manned that has updated heads.
Also agree about the radiator. They have plastic caps on the ends (like, the entire sides, top to bottom are plastic) and those only get old and brittle over time. Your's might still have great flow for air and coolant still, but plastic ages and when a radiator fails more often than not it's a cracked side. Plus, it's an easy enough swap with the engine out and they are less than $200
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post #6 of 9 (permalink) Old 09-03-2019, 01:14 PM Thread Starter
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Quote:
Originally Posted by Wombler View Post
I agree with Blue. After the amount of work to swap the heads out, I would just look into a full re-manned that has updated heads.
Also agree about the radiator. They have plastic caps on the ends (like, the entire sides, top to bottom are plastic) and those only get old and brittle over time. Your's might still have great flow for air and coolant still, but plastic ages and when a radiator fails more often than not it's a cracked side. Plus, it's an easy enough swap with the engine out and they are less than $200
I will definitely put a new radiator in. I have had the plastic end cap on a radiator fail me in the past on a Caravan.
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post #7 of 9 (permalink) Old 10-15-2019, 03:28 PM Thread Starter
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Join Date: Aug 2019
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I just wanted to follow up. I purchased a remanufactured motor from Powertrain. I also purchased an all aluminum radiator from Ebay. Any other suggestions?
I have stripped away most of the engine compartment and am almost to the point of pulling the motor.
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post #8 of 9 (permalink) Old 10-15-2019, 04:49 PM
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Quote:
Originally Posted by Gregory Thornock View Post
I just wanted to follow up. I purchased a remanufactured motor from Powertrain. I also purchased an all aluminum radiator from Ebay. Any other suggestions?
I have stripped away most of the engine compartment and am almost to the point of pulling the motor.
@Gregory Thornock ; Considering that a rebuilt engine should come with a new/rebuilt water pump & alternator, the only other thing I might suggest would be buying a new Battery if you haven't done so already.

Unless you know for a fact, that the battery you have currently is 100% solid.

I would also check & verify if it has come with a new TCM & PCM, otherwise your old TCM & PCM would likely have to be reprogrammed to the new/rebuilt engine.


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Last edited by Big Blue; 10-16-2019 at 04:53 PM.
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post #9 of 9 (permalink) Old 10-16-2019, 02:12 PM
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Who has bought a remanned 3.7 and from where? seems like there could be a lot of variability in quality based on what their remanned standard is?
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