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#4507276 - 09/04/17 02:12 PM Jeep Liberty 3.7L owners - Should I be concerned?
JGmazda Offline


Registered: 05/25/05
Posts: 564
Loc: Arizona
I haven't found too many threads dealing with the Jeep Liberty 3.7L engine. I'm told there are some issues with overheating and "valve dropping" but that's about it. Any opinions on the 3.7L engine?

I'm looking at 2005-2008 models. I thought this vehicle would be able to tackle some light off-road and still be reliable.

Only concerns would be engine longevity as these vehicles have a 100K mileage average for those years. I wanted something with a timing chain vs. belt. Looked at a KIA Sorento (2006 model) as it's full frame but it's got a timing belt.

The Jeep seems like it would be easy to work on. Any wisdom would be appreciated! Thank you!

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#4507287 - 09/04/17 02:29 PM Re: Jeep Liberty 3.7L owners - Should I be concerned? [Re: JGmazda]
AVB Offline


Registered: 05/20/12
Posts: 1283
Loc: Georgia
I have seen one 3.7 break a valve spring, drop a valve and break a piston. I don't like them in general.

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#4507288 - 09/04/17 02:32 PM Re: Jeep Liberty 3.7L owners - Should I be concerned? [Re: JGmazda]
Chris142 Offline


Registered: 06/05/03
Posts: 16844
Loc: Deplorable in apple valley, ca
They drop valve seats if overheated. Like a hose bursts or a radiator breaks and they keep driving it. Dont get them hot and they run a long time.
_________________________
02 Wrangler durablend 10w40
87 F250 traveler 15w40
04 Tahoe super-s 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40

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#4507290 - 09/04/17 02:33 PM Re: Jeep Liberty 3.7L owners - Should I be concerned? [Re: JGmazda]
JGmazda Offline


Registered: 05/25/05
Posts: 564
Loc: Arizona
Thanks AVB. I've read as long as they do NOT overheat, they shouldn't have an issue. Thanks for your input.

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#4507293 - 09/04/17 02:36 PM Re: Jeep Liberty 3.7L owners - Should I be concerned? [Re: Chris142]
JGmazda Offline


Registered: 05/25/05
Posts: 564
Loc: Arizona
Originally Posted By: Chris142
They drop valve seats if overheated. Like a hose bursts or a radiator breaks and they keep driving it. Dont get them hot and they run a long time.


So, a positive vote. I do see more than few for sale around the 100-130k miles. A friend is still driving his at 160k.
Just worried I'd be asking for trouble with a Chrysler vehicle.

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#4507294 - 09/04/17 02:38 PM Re: Jeep Liberty 3.7L owners - Should I be concerned? [Re: JGmazda]
AVB Offline


Registered: 05/20/12
Posts: 1283
Loc: Georgia
I don't think this one was run hot. I think the valve spring broke and they kept driving it until the keeper worked loose and the valve dropped. I am pretty sure that the valve seat was still intact on that one.


Edited by AVB (09/04/17 02:39 PM)

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#4507298 - 09/04/17 02:48 PM Re: Jeep Liberty 3.7L owners - Should I be concerned? [Re: JGmazda]
addyguy Offline


Registered: 09/08/05
Posts: 14288
Loc: Canada
They seem to be reliable, but very hard on gas.
_________________________
2010 Kia Soul 2U - 2.0L I-4, auto; 126k miles.
M1 EP 10W-30; OEM Kia filter.

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#4507328 - 09/04/17 03:32 PM Re: Jeep Liberty 3.7L owners - Should I be concerned? [Re: JGmazda]
fcjeep Offline


Registered: 02/03/16
Posts: 100
Loc: NY
I have the 4.7L in my '06 Grand Cherokee.

I understand that the 3.7L is the 4.7L with 2 cylinders chopped off. I'm the original owner of my GC and am very happy with this motor so far at almost 151,000 miles as a daily driver, with no off-roading or towing. Motor was never opened for anything. I do as much maintenance as I can myself and it's not hard to work on since it has a decent amount of room for most maintenance/repairs. The 3.7 has even more room to work than the 4.7. Parts prices are reasonable too.

As has been said already, don't let it overheat or you'll drop valve seats.

I've used name brands of 5w-30 oil, dino or syn whatever I get a good deal on. OCI 5,000 miles max and a basic filter.

If you do buy it, check to see if the yellow wire to the starter motor has been replaced. They were not sealed properly at the factory and would suddenly cause a "no start" condition. Not expensive to replace but difficult to do on your back in your driveway.

Here's an older thread you might find helpful:

https://bobistheoilguy.com/forums/ubbthreads.php/topics/3627711/1
_________________________
2006 Jeep GC 4.7L, Died @ 153059 mi
2008 Xterra 4.0L, 99000 mi
2016 Jeep GC 3.6L, 12600 mi
2010 Fusion 3.5L, 110300 mi
2017 Benz C300 Sport 8K mi

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#4507339 - 09/04/17 03:42 PM Re: Jeep Liberty 3.7L owners - Should I be concerned? [Re: JGmazda]
riklyn Offline


Registered: 10/17/16
Posts: 50
Loc: Heart of Dixie
Have a buddy just replaced this motor in an 07 Wrangler. We were on way to baseball tourney stopped to get gas and it never turned over again. He hadn't had it but about a month so don't know history behind it. My only experience.
_________________________
2016 Dodge Ram 5.7 Hemi
2004 Wrangler TJ (Unlimited) 4.0

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#4507373 - 09/04/17 04:31 PM Re: Jeep Liberty 3.7L owners - Should I be concerned? [Re: riklyn]
dishdude Online   content


Registered: 11/14/08
Posts: 8768
Loc: Phoenix
Originally Posted By: riklyn
Have a buddy just replaced this motor in an 07 Wrangler. We were on way to baseball tourney stopped to get gas and it never turned over again. He hadn't had it but about a month so don't know history behind it. My only experience.


I don't think the Wrangler ever got the 3.7
_________________________
2018 Challenger SRT

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#4507380 - 09/04/17 04:42 PM Re: Jeep Liberty 3.7L owners - Should I be concerned? [Re: fcjeep]
JGmazda Offline


Registered: 05/25/05
Posts: 564
Loc: Arizona
Originally Posted By: fcjeep
I have the 4.7L in my '06 Grand Cherokee.

I understand that the 3.7L is the 4.7L with 2 cylinders chopped off. I'm the original owner of my GC and am very happy with this motor so far at almost 151,000 miles as a daily driver, with no off-roading or towing. Motor was never opened for anything. I do as much maintenance as I can myself and it's not hard to work on since it has a decent amount of room for most maintenance/repairs. The 3.7 has even more room to work than the 4.7. Parts prices are reasonable too.

As has been said already, don't let it overheat or you'll drop valve seats.

I've used name brands of 5w-30 oil, dino or syn whatever I get a good deal on. OCI 5,000 miles max and a basic filter.

If you do buy it, check to see if the yellow wire to the starter motor has been replaced. They were not sealed properly at the factory and would suddenly cause a "no start" condition. Not expensive to replace but difficult to do on your back in your driveway.

Here's an older thread you might find helpful:

https://bobistheoilguy.com/forums/ubbthreads.php/topics/3627711/1




Thank you for this! I appreciate the input. Is there a good way to tell if the engine was overheated in the past? Also... What type of coolant is everyone running? HOAT?

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#4507389 - 09/04/17 05:00 PM Re: Jeep Liberty 3.7L owners - Should I be concerned? [Re: JGmazda]
Chris142 Offline


Registered: 06/05/03
Posts: 16844
Loc: Deplorable in apple valley, ca
Originally Posted By: JGmazda
Originally Posted By: fcjeep
I have the 4.7L in my '06 Grand Cherokee.

I understand that the 3.7L is the 4.7L with 2 cylinders chopped off. I'm the original owner of my GC and am very happy with this motor so far at almost 151,000 miles as a daily driver, with no off-roading or towing. Motor was never opened for anything. I do as much maintenance as I can myself and it's not hard to work on since it has a decent amount of room for most maintenance/repairs. The 3.7 has even more room to work than the 4.7. Parts prices are reasonable too.

As has been said already, don't let it overheat or you'll drop valve seats.

I've used name brands of 5w-30 oil, dino or syn whatever I get a good deal on. OCI 5,000 miles max and a basic filter.

If you do buy it, check to see if the yellow wire to the starter motor has been replaced. They were not sealed properly at the factory and would suddenly cause a "no start" condition. Not expensive to replace but difficult to do on your back in your driveway.

Here's an older thread you might find helpful:

https://bobistheoilguy.com/forums/ubbthreads.php/topics/3627711/1




Thank you for this! I appreciate the input. Is there a good way to tell if the engine was overheated in the past? Also... What type of coolant is everyone running? HOAT?
if the radiator and hoses are original then its likely never been hot. Plus they blow head gaskets if overheated.


Edited by Chris142 (09/04/17 05:01 PM)
_________________________
02 Wrangler durablend 10w40
87 F250 traveler 15w40
04 Tahoe super-s 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40

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#4507412 - 09/04/17 05:26 PM Re: Jeep Liberty 3.7L owners - Should I be concerned? [Re: JGmazda]
fcjeep Offline


Registered: 02/03/16
Posts: 100
Loc: NY
As far as coolant, Zerex G-05 and dealer coolant (make sure they give you the right stuff) is all I ever found available.

AFAIK power steering fluid is also a specific spec. No one has it except the dealer. $18 a qt I think last time I bought but you don't need it too often. I know about Mag-Moss but no one else has it as of last time I checked.
_________________________
2006 Jeep GC 4.7L, Died @ 153059 mi
2008 Xterra 4.0L, 99000 mi
2016 Jeep GC 3.6L, 12600 mi
2010 Fusion 3.5L, 110300 mi
2017 Benz C300 Sport 8K mi

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#4507424 - 09/04/17 05:38 PM Re: Jeep Liberty 3.7L owners - Should I be concerned? [Re: JGmazda]
HoosierJeeper Offline


Registered: 11/23/16
Posts: 1276
Loc: WI
Checkout some of the Liberty forums.

02s had valvespring issues, otherwise they're great, just don't overheat them. Many have hit 300k without issues. Keep clean 5w30 of whatever you like in them.

PS fluid is ATF+4 for 03+, 02s had something weird but got back spec'd to ATF+4.

They're very easy to work on. Stock suspension is trash, was when new too so I replaced mine with Old Man Emu stuff and it rides as good as my LR3 and better than my new Cherokee. I have 167k on mine. Love it. The biggest issue was I did have to get the trans rebuilt last summer (failed TC), so make sure yours has a service history regarding the trans. Most people don't have an issue, but it's worth bringing up.
08+ is a different era, largely the same, just a little bigger and they went to a 5 link rear suspension and not 3. Electronic shift t case too.
_________________________
15 Jeep KL Limited V6: Formula Shell 5W20
07 LR3 SE V8: Maxlife 5W30
05 Jeep KJ Limited: PHM 5W30
96 Jeep XJ Country: STP HM 5W30 (winter)

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#4507492 - 09/04/17 06:57 PM Re: Jeep Liberty 3.7L owners - Should I be concerned? [Re: riklyn]
Rand Offline


Registered: 08/20/03
Posts: 12654
Loc: NE,Ohio
Originally Posted By: riklyn
Have a buddy just replaced this motor in an 07 Wrangler. We were on way to baseball tourney stopped to get gas and it never turned over again. He hadn't had it but about a month so don't know history behind it. My only experience.


incorrect the wrangler never had the 3.7

IIRC those had a 3.8L and it was the first year for that engine.. replacing the 4.0
_________________________
2017 Jeep Cherokee Trailhawk V6

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