The spark plug gap for a 1984 258 6 cylinder Jeep should be set at .033 inches. New spark plugs will be preset and should not need adjustments.
A Jeep Wrangler has one spark plug per cylinder.
1991 Jeep Cherokee 2WD 4.0L MFI 6cylThe Spark Plug Gap.035 (In thousandths of an inch)
1981 Jeep CJ5 4.2L 2BL 6cylThe Spark Plug Gap.035 (In thousandths of an inch)
.035 inch
.035 inch
I think it's .035
Number one spark plug is closest to the radiator.
.35 inches .89mm
( .044 inch ) spark plug gap for your 1984 ( 300 cubic inch ) 4.9 L straight 6 cylinder Ford engine
For the 1991 Jeep Cherokee 2-wheel drive, 4.0 liter 6-cylinder, the spark plug gap is .035 (in thousandths). It should be noted that the gap is not adjustable on all brands of spark plugs. Check the package before purchasing plugs.
On the v 8 it is the front driver side cylinder.
4 cyl & 6 in lline is 0.035 of an inch , & V6 0.045