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Jeep Liberty 3.7L owners - Should I be concerned? #4507276
09/04/17 01:12 PM
09/04/17 01:12 PM
Joined: May 2005
Posts: 569
Arizona
JGmazda Offline OP
JGmazda  Offline OP
Joined: May 2005
Posts: 569
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!

Re: Jeep Liberty 3.7L owners - Should I be concerned? [Re: JGmazda] #4507287
09/04/17 01:29 PM
09/04/17 01:29 PM
Joined: May 2012
Posts: 1,404
Georgia
AVB Offline
AVB  Offline
Joined: May 2012
Posts: 1,404
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.

Re: Jeep Liberty 3.7L owners - Should I be concerned? [Re: JGmazda] #4507288
09/04/17 01:32 PM
09/04/17 01:32 PM
Joined: Jun 2003
Posts: 17,834
Deplorable in apple valley, ca
Chris142 Offline
Chris142  Offline
Joined: Jun 2003
Posts: 17,834
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 carlube 5w30
87 F250 traveler 15w40
07 fjcruiser Chevron 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40
Re: Jeep Liberty 3.7L owners - Should I be concerned? [Re: JGmazda] #4507290
09/04/17 01:33 PM
09/04/17 01:33 PM
Joined: May 2005
Posts: 569
Arizona
JGmazda Offline OP
JGmazda  Offline OP
Joined: May 2005
Posts: 569
Arizona
Thanks AVB. I've read as long as they do NOT overheat, they shouldn't have an issue. Thanks for your input.

Re: Jeep Liberty 3.7L owners - Should I be concerned? [Re: Chris142] #4507293
09/04/17 01:36 PM
09/04/17 01:36 PM
Joined: May 2005
Posts: 569
Arizona
JGmazda Offline OP
JGmazda  Offline OP
Joined: May 2005
Posts: 569
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.

Re: Jeep Liberty 3.7L owners - Should I be concerned? [Re: JGmazda] #4507294
09/04/17 01:38 PM
09/04/17 01:38 PM
Joined: May 2012
Posts: 1,404
Georgia
AVB Offline
AVB  Offline
Joined: May 2012
Posts: 1,404
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.

Last edited by AVB; 09/04/17 01:39 PM.
Re: Jeep Liberty 3.7L owners - Should I be concerned? [Re: JGmazda] #4507298
09/04/17 01:48 PM
09/04/17 01:48 PM
Joined: Sep 2005
Posts: 14,360
Canada
addyguy Offline
addyguy  Offline
Joined: Sep 2005
Posts: 14,360
Canada
They seem to be reliable, but very hard on gas.


2010 Kia Soul 2U - 2.0L I-4, auto; 137k miles.
M1 EP 10W-30; OEM Kia filter.
Re: Jeep Liberty 3.7L owners - Should I be concerned? [Re: JGmazda] #4507328
09/04/17 02:32 PM
09/04/17 02:32 PM
Joined: Feb 2016
Posts: 170
NY
fcjeep Offline
fcjeep  Offline
Joined: Feb 2016
Posts: 170
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 frown
2008 Xterra 4.0L, 104500 mi
2016 Jeep GC 3.6L, 19100 mi
2017 Benz C300 14000 mi
Re: Jeep Liberty 3.7L owners - Should I be concerned? [Re: JGmazda] #4507339
09/04/17 02:42 PM
09/04/17 02:42 PM
Joined: Oct 2016
Posts: 73
Heart of Dixie
riklyn Offline
riklyn  Offline
Joined: Oct 2016
Posts: 73
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
Re: Jeep Liberty 3.7L owners - Should I be concerned? [Re: riklyn] #4507373
09/04/17 03:31 PM
09/04/17 03:31 PM
Joined: Nov 2008
Posts: 9,299
Phoenix
dishdude Offline
dishdude  Offline
Joined: Nov 2008
Posts: 9,299
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 392 PUP 0w-40 Wix 57899XP
2018 GTI
Re: Jeep Liberty 3.7L owners - Should I be concerned? [Re: fcjeep] #4507380
09/04/17 03:42 PM
09/04/17 03:42 PM
Joined: May 2005
Posts: 569
Arizona
JGmazda Offline OP
JGmazda  Offline OP
Joined: May 2005
Posts: 569
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?

Re: Jeep Liberty 3.7L owners - Should I be concerned? [Re: JGmazda] #4507389
09/04/17 04:00 PM
09/04/17 04:00 PM
Joined: Jun 2003
Posts: 17,834
Deplorable in apple valley, ca
Chris142 Offline
Chris142  Offline
Joined: Jun 2003
Posts: 17,834
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.

Last edited by Chris142; 09/04/17 04:01 PM.

02 Wrangler carlube 5w30
87 F250 traveler 15w40
07 fjcruiser Chevron 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40
Re: Jeep Liberty 3.7L owners - Should I be concerned? [Re: JGmazda] #4507412
09/04/17 04:26 PM
09/04/17 04:26 PM
Joined: Feb 2016
Posts: 170
NY
fcjeep Offline
fcjeep  Offline
Joined: Feb 2016
Posts: 170
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 frown
2008 Xterra 4.0L, 104500 mi
2016 Jeep GC 3.6L, 19100 mi
2017 Benz C300 14000 mi
Re: Jeep Liberty 3.7L owners - Should I be concerned? [Re: JGmazda] #4507424
09/04/17 04:38 PM
09/04/17 04:38 PM
Joined: Nov 2016
Posts: 1,283
WI
HoosierJeeper Offline
HoosierJeeper  Offline
Joined: Nov 2016
Posts: 1,283
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)
Re: Jeep Liberty 3.7L owners - Should I be concerned? [Re: riklyn] #4507492
09/04/17 05:57 PM
09/04/17 05:57 PM
Joined: Aug 2003
Posts: 13,144
NE,Ohio
Rand Offline
Rand  Offline
Joined: Aug 2003
Posts: 13,144
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


2019 Jeep Cherokee Trailhawk 2.0T
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