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3.7 L engine

Old 10-17-2016, 07:24 PM
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Question 3.7 L engine

considering buying '07 Grand Cherokee Laredo 3.7 L engine, 4 x 4, 67K miles. My Mech. says stay away from the 3.7 L engine. they are a nightmare to work on. I would like to know if others have had same problems?
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Old 10-17-2016, 08:44 PM
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Welcome to CF!

First of all, most modern engines are getting quite complicated to work on. Having said that, let's talk about the 3.7. This engine is nothing more than a 4.7 minus 2 cylinders, as in OHC aluminum head, iron block, chain driven nightmare to work on. They have a history of warped heads and blown head gaskets, dropped valve seat inserts, and broken timing chain guides. Many people have no problems with them, but when problems DO appear, they can be costly to fix.

JMHO, but my experience is with basically bullet-proof Chevy small block V8s and Jeep 4.0 straight 6s, so I don't trust these "new-age" engines at all. As with all engines, maintenance is the key to longevity, but these new engines require more than most.

I think the key to buying a used car of any kind is how it's been treated before you bought it. Again, just my opinion, but if it's been neglected, stay away from it unless you're willing to work on it.

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Old 10-17-2016, 09:07 PM
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Welcome!

My '05 Ram has the 3.7L in it with 155K on it. I have not had any engine problems with it - I can't attest whether or not the engine is a nightmare to work on as I've never had to!

I used to work at a TV news station that had two Jeep Liberty's with the 3.7L for the news team. Both were somewhat abused (driven hard with minimal maintenance) but were always reliable. One had 220K before it was replaced. The other was still going strong with 175Kish when I left.

So my experience with the 3.7L has been positive, but I may have been one of the lucky ones.
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Old 10-17-2016, 09:18 PM
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I sort of knew this was coming! Of course many people have good luck with them, but I just recently saw a Jeep Liberty torn apart because a timing chain guide (plastic) broke and the chain jumped destroying all 3 pistons and the valves on one bank.
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Old 10-17-2016, 09:28 PM
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Dave i swear they build new cars to last just as long as the warranty on them anymore.
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Old 10-17-2016, 10:03 PM
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If you're going to buy a WK (2005-2010) Grand Cherokee, I'd highly recommend looking for one with the 5.7L HEMI V8. In my opinion that was the only good engine in these Jeeps.
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Old 10-18-2016, 05:20 AM
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^^what he said X2^^
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Old 10-18-2016, 06:38 AM
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Originally Posted by dave1123 View Post
I sort of knew this was coming! Of course many people have good luck with them, but I just recently saw a Jeep Liberty torn apart because a timing chain guide (plastic) broke and the chain jumped destroying all 3 pistons and the valves on one bank.
That sounds fun. It seems to me that the 3.7L/4.7L are very hit or miss engines. Some people swear by them, some people swear at them.
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Old 10-18-2016, 09:47 AM
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Originally Posted by andrewmp6 View Post
Dave i swear they build new cars to last just as long as the warranty on them anymore.


I recall when Chrysler did that back in the 80's! Lee's philosophy was that the public will buy more cars if they don't last as long. Remember the K-car??
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Old 10-18-2016, 12:05 PM
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ugh I hate 3.7's. Garbage. Just did the heads on the wife's liberty at 135k miles because it overheated and pushed the gaskets out. I can go on and on and on about how much these things suck. Had a friend with one and it first lost the waterpump but did not overheat. It then loved to mysteriously lose coolant. Never really had a chance to dig into that one. I'd stay far away from them if I could. Can't wait to get rid of the wife's Liberty.
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Old 10-18-2016, 01:02 PM
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Originally Posted by jon-d View Post
I recall when Chrysler did that back in the 80's! Lee's philosophy was that the public will buy more cars if they don't last as long. Remember the K-car??
Wait just a minute! The K-car was a POS rolling tin can, but it kept running! That 4 cylinder kept running long enough for my wife to drive it home with a completely plugged converter! It blew the EGR valve completely off the manifold and popped the head gasket, but it still ran! I replaced the head gasket, converter and EGR valve and she drove it for another year and a half. As a matter of fact, she drove it to Orlando and back after me telling her not to! She hit some black ice and folded it around a tree, then bought a Caravan, one of Lee's better ideas.
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