Ok after 13 years, what's the verdict on our 3.7 EKG engines? - JeepForum.com
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post #1 of 17 Old 04-26-2015, 10:04 AM Thread Starter
00RedWJ
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Ok after 13 years, what's the verdict on our 3.7 EKG engines?

The old 4.0 straight 6 engines were around forever and were known to be a reliable workhorse. What's the verdict on our 3.7 engines now that they've been around for 13 years? From my experience it has been a reliable, leak free, easy to maintain motor. I've had 85k trouble free miles. I never found it to be any more fuel efficient than its 4.0 predecessor but it gets the job done with decent low end torque. What is your opinion?


2000 Red Laredo WJ
4.0 with Selec-trac - Sold
2006 Black Laredo WK
3.7 with 95,000 Miles
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post #2 of 17 Old 04-26-2015, 10:31 AM
optdoug
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I don't own a Jeep with a 3.7, but my girlfriend has a 2003 Liberty and the motor is holding up well with about 180k miles on it. I have not done any major repairs on it. Just a radiator so far. And varius things you would expect to replace like belts, water pump and a few other minor things. That's pretty good if you ask me. The fuel efficiency is a little better than my 4.0, but not by much.
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post #3 of 17 Old 04-29-2015, 06:54 PM Thread Starter
00RedWJ
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Any more comments?

2000 Red Laredo WJ
4.0 with Selec-trac - Sold
2006 Black Laredo WK
3.7 with 95,000 Miles
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post #4 of 17 Old 04-29-2015, 07:37 PM
nighowl2000
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my wife bought her 2010 commander 3.7 with 170 000km. The water pump blew last week which sprayed all over the serpentine belt which caused the alternator to not charge the battery. New water pump/thermostat/serpentine belt and the engine is running fine.

mine: 2014 jku sport S

her's: 2010 commander sport 3.7L 4x4
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post #5 of 17 Old 04-29-2015, 08:18 PM
ColoradoGrand05
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177,000 on it now and apart from a random misfire a few months ago, not an issue (knock on wood).

Still looking to trade up to a Hemi (or a CRD if I can find one) for more power though.

2007 WK, 4.7L

Colorado Jeep club #288
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post #6 of 17 Old 04-30-2015, 03:00 PM
msully725
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07 3.7, 87k miles. Still runs fine. Its a weird motor, kind of a slouch, but seems to take a beating and keep going. Can idle funny sometimes.

As far as maintenance, had to replace water pump at 65k miles, starter at 72k miles.
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post #7 of 17 Old 04-30-2015, 05:27 PM
JackB1
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My 4.0 was pretty much bullet proof. I am not ready at 70K to say that yet about my 3.7. One thing to pay attention to is making sure spark plugs don't seize in aluminum heads and low battery can create more issues than 4.0. Still seems to be a pretty good engine.
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post #8 of 17 Old 04-30-2015, 05:39 PM Thread Starter
00RedWJ
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I found my belt tensioner was always a little noisy. Nothing wrong with it, just by design. I bought an after market one that is silent

2000 Red Laredo WJ
4.0 with Selec-trac - Sold
2006 Black Laredo WK
3.7 with 95,000 Miles
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post #9 of 17 Old 05-01-2015, 08:27 AM
Nejeep
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My 06 WK with a 3.7 has only 53k miles but no engine problems in the 7 years we have been driving it. Maintained per owners manual, conventional oil, G05 coolant, etc.
NAG1 trany needed more attention as it had a couple of leaks during that time.

19 Limited 4x4 3.6 White/Tan new daily driver
06 Laredo for 11 years
97 Laredo for 14 years
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post #10 of 17 Old 05-01-2015, 10:40 AM
BoraBora
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3.7 is a good motor. Didn't have any problems with mine. Previous owner put 65k miles on it with very little maintenance (didn't change any fluids except the oil).

I took it from 65k to 97k miles. Changed all the fluids and had no problems. Its a fine engine. The lack of power comes from the crap 3.07 gearing in the WK's. Even with the 3.07's I had no problem turning 285's. Still had passing power on highways.

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post #11 of 17 Old 04-09-2020, 07:44 AM
Jambalam
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Hello old thread!

I bought my 3.7 with around 140k miles and am now pushing 170k. Previous owner didn't do much maintenance at all. I put some TLC in and she's doing just fine! Hoping to get many more miles from her.

I remember chatting with a diesel mechanic while my other Jeep was in for some work and scoffing at my lowly 3.7 Grand Cherokee. He stopped me and said he loved his 3.7 Grand Cherokee, pushed it past 300k miles...

2007 Grand Cherokee Limited CRD.
2006 Grand Cherokee Larado 3.7 V6.
Denver,CO
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post #12 of 17 Old 04-09-2020, 08:06 AM Thread Starter
00RedWJ
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I love when people wake up my old threads. I ended up selling my 2006 WK a year ago with 130k on it having never had one problem with that 3.7 engine. Ran like new, no leaks and didn’t consume any oil. Good motor.

2000 Red Laredo WJ
4.0 with Selec-trac - Sold
2006 Black Laredo WK
3.7 with 95,000 Miles
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post #13 of 17 Old 05-18-2020, 07:48 AM
ewild
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I have a 2008 Grand Cherokee with 274K miles on the 3.7 engine. Still going strong, so far, only replaced the water pump twice.
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post #14 of 17 Old 05-29-2020, 01:10 PM
jeepjeepster
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Take care of them and it'll most likely be fine. They cannot be abused at all. Dont do oil changes or overheat them? Wouldnt be surprised to see it drop a rocker arm or valve seat.

I trust my 4.0 with 270,000miles more than I do my liberty with 110,000miles.

1994 ZJ-I6 w/216,000 mi
1998 ZJ 5.9 w/65,155 mi Slate Black
2004 KJ w/90,300 mi
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post #15 of 17 Old 05-29-2020, 06:07 PM
hem1
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A customer walked into my local repair shop with a 3.7, 415,000 on the dash. Lady, non-smoker. Aside from interior and exterior wear and tear, and a replaced tranny at one point, the motor was in decent shape. He replaced the head gasket, changed the oil, thermostat, and she was on her way.
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