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Not a typical 4L Jeep straight 6 #2830890
10/09/20 05:28 PM
10/09/20 05:28 PM
Joined: Jan 2006
Posts: 6,173
USA
3
360view Offline OP
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360view  Offline OP
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Joined: Jan 2006
Posts: 6,173
USA

Re: Not a typical 4L Jeep straight 6 [Re: 360view] #2830999
10/10/20 12:13 AM
10/10/20 12:13 AM
Joined: Aug 2005
Posts: 5,471
at work
Grizzly Offline
master
Grizzly  Offline
master

Joined: Aug 2005
Posts: 5,471
at work
Boy, did they hit the nail on the head calling the 4.0 "lazy" and being known for "lack of power". wink

Up until now I thought all those engines were good for was donating their EFI to Slant Sixes?

I'm impressed and that was a VERY good read, thanks 360View! beer The video is one of the best engine videos I've ever seen. Learned alot from watching it.

Re: Not a typical 4L Jeep straight 6 [Re: Grizzly] #2831160
10/10/20 01:40 PM
10/10/20 01:40 PM
Joined: Mar 2003
Posts: 5,075
Las Vegas, NV
Tom_440 Offline
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Tom_440  Offline
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Joined: Mar 2003
Posts: 5,075
Las Vegas, NV
Very impressive!!!
That would be interesting in my TJ, but I don't think it would fit. But if it did, it would destroy the trans, transfer case, drive shafts and axles. But it would be fun!!!

Re: Not a typical 4L Jeep straight 6 [Re: Tom_440] #2831250
10/10/20 04:51 PM
10/10/20 04:51 PM
Joined: Jan 2011
Posts: 5,511
Central Florida
larrymopar360 Offline
I'm tired...Very tired.
larrymopar360  Offline
I'm tired...Very tired.

Joined: Jan 2011
Posts: 5,511
Central Florida
A bit of a tangent here. My brother in law is looking to buy older Wrangler. What year was the last year for the bullet proof 4.0 liter straight six?


Facts are stubborn things.
Re: Not a typical 4L Jeep straight 6 [Re: larrymopar360] #2831289
10/10/20 06:13 PM
10/10/20 06:13 PM
Joined: Nov 2007
Posts: 20,766
Kirkland, Washington
Pacnorthcuda Offline
Too Many Posts
Pacnorthcuda  Offline
Too Many Posts

Joined: Nov 2007
Posts: 20,766
Kirkland, Washington
Originally Posted by larrymopar360
A bit of a tangent here. My brother in law is looking to buy older Wrangler. What year was the last year for the bullet proof 4.0 liter straight six?


2006, then it was replaced in 2007 by the horrible 3.8 minivan engine. In 2012 they came out with the MUCH better 3.6 v6.

Re: Not a typical 4L Jeep straight 6 [Re: Pacnorthcuda] #2831477
10/11/20 10:22 AM
10/11/20 10:22 AM
Joined: Jan 2011
Posts: 5,511
Central Florida
larrymopar360 Offline
I'm tired...Very tired.
larrymopar360  Offline
I'm tired...Very tired.

Joined: Jan 2011
Posts: 5,511
Central Florida
Okay, I didn't know all the 4.0 were good. I thought maybe the later version might not have been the same engine internally. Thanks.


Facts are stubborn things.
Re: Not a typical 4L Jeep straight 6 [Re: larrymopar360] #2831591
10/11/20 02:53 PM
10/11/20 02:53 PM
Joined: Mar 2003
Posts: 5,075
Las Vegas, NV
Tom_440 Offline
master
Tom_440  Offline
master

Joined: Mar 2003
Posts: 5,075
Las Vegas, NV
I'm swapping motors in my 2000 TJ because of a cracked head. The '99 - 2001 Jeep 4.0's had a issue with heads occasionally cracking, letting antifreeze into the oil, and cooking the bearings. The issue was fixed in 2002 with TUPY heads.

https://www.jeepforum.com/forum/f9/i6-head-problems-1999-2001-a-1452146/#:~:text=yup.,out%20to%20have%20ductility%20problems.

The cracked head issue isn't really common, and its not hard to swap heads, but just something to keep in mind when you are shopping.

Re: Not a typical 4L Jeep straight 6 [Re: Tom_440] #2831593
10/11/20 02:57 PM
10/11/20 02:57 PM
Joined: Nov 2007
Posts: 20,766
Kirkland, Washington
Pacnorthcuda Offline
Too Many Posts
Pacnorthcuda  Offline
Too Many Posts

Joined: Nov 2007
Posts: 20,766
Kirkland, Washington
Originally Posted by Tom_440
I'm swapping motors in my 2000 TJ because of a cracked head. The '99 - 2001 Jeep 4.0's had a issue with heads occasionally cracking, letting antifreeze into the oil, and cooking the bearings. The issue was fixed in 2002 with TUPY heads.

https://www.jeepforum.com/forum/f9/i6-head-problems-1999-2001-a-1452146/#:~:text=yup.,out%20to%20have%20ductility%20problems.

The cracked head issue isn't really common, and its not hard to swap heads, but just something to keep in mind when you are shopping.


I’ve heard head gaskets and cracks are about the only issue with the 4.0 and as we all know it’s a somewhat common issue amongst the straight six world of ALL makes. The big thing with 4.0’s is DONT LET THEM OVERHEAT.







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