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Jeep Engine: 4.0L I6

 Jeep Engines 

287(4.7L) V8
360(5.9L) V8
318(5.2L) V8
242(4.0L) I6
150(2.5L) I4
173(2.8L) V6
GM 151 I4
AMC 401 V8
AMC 360 V8
AMC 304 V8
AMC 258 I6
AMC 232 I6
"Dauntless" 350 V8
"Dauntless" 225 V6
"Vigilante" 327 V8
"Tornado" 230 I6
Perkins 192 I4
"Hurricane" 226 I6
"Hurricane" 134 I4
"Go Devil" 134 I4

Engines

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General


The 4.0L inline 6 (I6) engine was introduced in the Cherokee in the late 80s and in the YJ in 1991. The cylinder design is based on the changes made to the fuel injected 2.5L I4 engine. The block and cylinder head are cast iron. It uses 7 main bearings and hydraulic lifters. The HP and torque gains are substantial over the older carbureted 258, but the peaks come at higher RPM. The fuel injected engine performs much better in off-camber, bouncy, and steep situations. It also calibrates better for changes in altitude. Fuel economy is also improved.

A good way to embarass yourself in front of your Jeeping friends is to refer to it as a V6. It isn't a V6, it is an inline 6 or I6. The "V" in V6 refers to the configuration of the pistons in the block. The only two V6 engines ever available from the factory in a Jeep are the 225 "Dauntless" Buick V6 in the late 60s and early 70s and the 2.8L GM V6 in 80s Cherokees and Comanches. If you are shopping for a Cherokee or Comanche, make sure you get the 4.0L and not the 2.8L engine, there is a world of difference.

The 4.0L engine used in the Wrangler from '91 until the present.

4.0L I6
Bore x Stroke3.88" x 3.41"
Displacement242 (4.0L)
Compression Ratio8.8:1
Horsepower (net)180@4750
Torque (net)220@4000
Main Bearings7
Valve ConfigurationOHV
FuelMPI

The 4.0L I6 that is used in the XJ and ZJ is rated slightly higher than the YJ and TJ 4.0L engine probably due to a different exhaust system.

4.0L I6
Bore x Stroke3.88" x 3.41"
Displacement242 (4.0L)
Compression Ratio8.8:1
Horsepower (net)185@4750
Torque (net)220@4000
Main Bearings7
Valve ConfigurationOHV
FuelMPI

Last modified Wednesday, 01-Dec-2010 08:33:34 MST


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Thomas (4/2/2013)
I thought the 4.0L had 190HP fully? Wish they would post more engine specs a and fuel economy information. Overall great website!

Tammy Groves (3/15/2013)
I love my 1994 Jeep Grand Cherokee I have 230,000 miles on it and am getting ready to take yet another trip home to Kansas in it. My late husband worked as a mechanic for Chrysler all his adult life and there for he would only let me drive the best of the best. I would love to have another jeep like this one, with fewer miles. This one I could give to my daughter to have for around town driving.

Mitch T (11/25/2012)
Does anyone know of a upgraded piston for the 4.0 liters? I am rebuilding mine and want to put a decent set of pistons in the wont brake the skirts off.

Eric (7/27/2012)
I have a 97 Xj with a 4.0 and it has 310,000 miles and i take it off road and on the beach. one of the best engines made.

ALİ (2/29/2012)
What is the fuel consumption figures for the 93 4.0 LI 6 engine on grand cherokee ?

Mike C (2/5/2012)
I have a 1999 Grand Cherokee Laredo 4x4 with the inline 6 engine. It has 188,000 miles on it and it is the best, most reliable vehicle I have ever owned. The 4.0 liter 6 engine still runs flawlessly. I change Mobil 1 synthetic oil and filter every 8 to 10,000 miles since 1999 with no problems. I think the engine can easily achieve 300,000 miles with reasonable care.

jessie james (1/4/2012)
206,000 on 93 xj 4.0 I6 cranks everytime an runs like a champ

bobby tj (12/4/2011)
I have 147,000 on my wrangler. compression across all cylinders is still above 8.0 and oil pressure is 45 at idle. i expect to get another 150.000 out of mine if thats any help. my last died at 290,000

Daniel (11/2/2011)
I have 318,000 miles on my 94 Cherokee with the 4.0 i6

cliffford25624 (10/1/2011)
thinking of purchasing a 2004 Grand Cherokee 4.0L I6 with 106K miles...what is the average lifespan of the 4.0L I6?

Eric (6/23/2011)
With proper maintainence you could get 100k+ miles out of it.

dave t (5/14/2011)
need info on a wiring diagram using 98 cherokee engine stock wiring harness need to place wires in proper place. Putting motor in a 89 wrangler.

Dave (4/24/2011)
Thinking of purchasing an 05 Wrangler sport 4.0 eng. w/101k, Runs and sounds good. How many more miles can I anticipate to put on this engine

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