- 1979 Jeep CJ-7: Jeep CJ-7 is a car that has an off-road vehicle body style with a front mounted engine driving through all four wheels. It's powered courtesy of a naturally aspirated engine of 5 litre capacity. This unit features overhead valve valve gear, 8 cylinder layout, and 2 valves per cylinder.
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Jeep lug nut torque specs Jeep lug nut torque specs Here are Jeep lug nut torque specs. All 2001-06 85-115 ft-lbs Cherokee 2014-17 100 ft-lbs Commander 2007-10 85-115 ft-lbs Compass/Patriot.2007-17 100 ft-lbs Grand Cherokee 2007-10 85-115 ft-lbs 2011-13 110 ft-lbs 2014 130 ft-lbs Non SRT models 2015-17 130 ft-lbs SRT models.2015-17 110.
The AMC 258 was introduced in 1971 in J-series pickups and Wagoneersand in 1972 in CJs. It continued to be used through 1990 in theWrangler. It is basically a stroked 232 engine. The great thingabout this engine is it reliable, inexpensive, and has horse powerand toque peaks at low RPM.
The 258 inline 6 (I6) engine always came from the factory carburetedany many people complain about the Carter BBD carburetor and the mazeof emmissions vacuum hoses. There are a couple articles below thatcan help you sort through those hoses and tune the Carter BBD. Fora carbureted engine, the 258 with the Carter BBD performs very welloff road. The 258 always came with a cast iron block and cylinderhead, hydraulic lifters (with non-adjustable rockers), and 7 mainbearings.
The 258 used in '87-'90 Wrangler YJs uses a computer controlledCarter BBD. It is very simlar to the 258 used in '82-'86 CJs,but performance suffers due to emmission controls.
| AMC 258 I6 | |
|---|---|
| Bore x Stroke | 3.75' x 3.90' |
| Displacement | 258 (4.2L) |
| Compression Ratio | 9.2:1 |
| Horsepower (net) | 112@3200 |
| Torque (net) | 210@2000 |
| Main Bearings | 7 |
| Valve Configuration | OHV |
| Fuel | 2bbl Carter BBD |
The 258 used in '82-'86 CJs used a computer controled Carter BBD. Thecomputer controls mixture based on an O2 sensor and other sensors.
| AMC 258 I6 | |
|---|---|
| Bore x Stroke | 3.75' x 3.90' |
| Displacement | 258 (4.2L) |
| Compression Ratio | 9.2:1 |
| Horsepower (net) | 115@3200 |
| Torque (net) | 210@1800 |
| Main Bearings | 7 |
| Valve Configuration | OHV |
| Fuel | 2bbl Carter BBD |
The 258 used in '79-'81 CJs, some used a 1bbl carb and some useda 2bbl carb.
| AMC 258 I6 | |
|---|---|
| Bore x Stroke | 3.75' x 3.90' |
| Displacement | 258 (4.2L) |
| Compression Ratio | 8.3:1 |
| Horsepower (net) | 110@3500 |
| Torque (net) | 195@2000 |
| Main Bearings | 7 |
| Valve Configuration | OHV |
| Fuel | 1bbl and 2bbl |
The 258 used in '72-'78 CJs, J-series pickups, and Wagoneers, someused a 1bbl carb and lower compression than later 258s.
| AMC 258 I6 | |
|---|---|
| Bore x Stroke | 3.75' x 3.90' |
| Displacement | 258 (4.2L) |
| Compression Ratio | 8.0:1 |
| Horsepower (net) | 110@3500 |
| Torque (net) | 195@2000 |
| Main Bearings | 7 |
| Valve Configuration | OHV |
| Fuel | 1bbl |
The 258 was introduced in 1971 as the standard enginein J-series pickups and Wagoneers.
| AMC 258 I6 | |
|---|---|
| Bore x Stroke | 3.75' x 3.90' |
| Displacement | 258 (4.2L) |
| Compression Ratio | 8.5:1 |
| Horsepower (gross) | 150@3800 |
| Torque (gross) | 240@1800 |
| Main Bearings | 7 |
| Valve Configuration | OHV |
| Fuel | 1bbl Carter or Holley |
Other Information
| Learning to LoveYour 258: An easy fix for the most common idle problems with the258(4.2L) engine used in Wranglers(YJ) and CJs. |
Contributors
4.0 Jeep Torque Specs
Some photos courtesy Rick Boiros.