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The 4.0 L is one of AMC's best-known engines. [30] It was one of four AMC engines kept in production when Chrysler bought AMC in 1987. Chrysler engineers continued to refine the engine to reduce noise, vibration, and harshness. The last in the line of the AMC inline sixes, the 4.0 L is regarded as one of the best Chrysler 4x4 off-road engines. [31]
The AMC straight-4 engine is a 2.5 L straight-four engine developed by American Motors Corporation (AMC) that was used in a variety of AMC, Jeep, and Dodge vehicles from 1984 through 2002. The 2.5 L I4 Jeep engine shared design elements and some internal components with the AMC 4.0 L I6 that was introduced for the 1987 model year.
258 cu in (4.2 L) 242 cu in (4.0 L) The early engines' bell pattern differed from AMC V8s. In 1971 AMC raised the block height and lengthened the stroke on the 199 and early 232 engines. The 199 became 232 cubic inches and the 232 became 258.
The AMC 4.0 engine saw extensive application in XJ Cherokees and Wagoneers, Grand Cherokees, and Wranglers, and many of those engines saw (or are seeing) extremely long lives, quite a few exceeding 300,000 mi (480,000 km). Chrysler built the XJ Cherokee until the end of the 2001 model year in the U.S. and until 2005 in China.
The stroke and deck height on the 290 and 343 were increased by 0.16 in (4.06 mm) on both engines, becoming the 304 cu in (5.0 L) and 360 cu in (5.9 L), respectively. The 1970 AMX 390 remained at the same displacement by using a special connecting rod and piston for this year only.
4.0 Litre AMC 242: 3964 cc (242 CID) I6, OHV Gasoline 190 hp (142 kW) at 4,600 rpm 225 lb⋅ft (305 N⋅m) at 3,000 rpm Chrysler MPI, high output 1991–1999 ...
The engines purchased by AMC continued to use the Chevrolet V8 bellhousing pattern. The four-cylinder engine was discontinued from AMC's rear-wheel drive models after 1982. During 1983, the all-wheel drive Eagle base engine switched from the Iron Duke to a new, AMC-developed 150 cu in (2.5 L) four-cylinder. The 1980 through 1983 Jeep CJs were ...
AMC, Jeep THM400: GM Aluminum 3 oil/water 232/258 I6 304/360/401 V8 Buick 350/327 V8, 230 V6 1965–1979 Jeep AW4 Aisin Warner: Aluminum 4 oil/water 242 (4.0 L) I6 1987–2001 Jeep 500SE (42RE) Chrysler Aluminum 4 oil/water 242 (4.0 L) I6 1993–2004 Jeep 42RLE Chrysler Aluminum 4 oil/water 3.7, 4.0 (242) V6 2002–present Jeep