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Showing results for tags '4.2l'.
Found 5 results
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Depending upon the year and engine source, 4.2L AMC/Jeep®/I-H version timing covers can be different than a 4.0L cover. The TDC mark may be many degrees away from the 4.0L damper mark, which is typically the damper used in a Mopar EFI conversion. Determine the true TDC for #1 piston when referencing TDC; this is determined by measuring the piston's position in #1 cylinder with the spark plug removed. The piston must stand at its peak when determining TDC. Note: Inexpensive TDC tools are available at Summit, Amazon and elsewhere: https://www.summitracing.com/parts/sum-900189 or TDC -
The timing cover on a 4.2L is different than the 4.0L. TDC mark is many degrees away from the 4.0L damper mark, which is typically the damper used in a Mopar EFI conversion. Use true TDC for #1 piston when referencing TDC. If your damper mark does not match up with #1 piston TDC, place the #1 piston at true TDC and scribe a timing mark on the damper to match the timing cover TDC. This is one builder’s 4.0L/4.6L experience. He has a 4.0L in a ’98 TJ Wrangler and installed an OE 4.2L/258 crankshaft. The 4.2L crankshaft keyway did not match his OE 4.0L crankshaft keyway position:
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I recently became the owner of a 1982 CJ8 with a 4.2. I have installed a HEI distributor, Holley Sniper BBD fuel injection on the jeep. I have replaced oil pan, rear main seal and valve cover gaskets in an attempt to stop the oil leaks but the rear main leak has gotten the best of my patience. The body is rough but serviceable and the engine runs ok but leaves a lot to be desired in the get up and go department. I would like to build a stroker engine and stay with a Jeep six cylinder. I would like to know if I can use the HEI distributor and fuel injection that I already have on a 4.6 build. -
For finding TDC on the compression stroke without the starter functioning, a time-honored approach is a whistle that fits into the spark plug hole for #1 piston. Spark plugs removed to ease crankshaft rotation, this device allows rotating the crankshaft by hand in the normal direction of rotation while listening for the whistle as the piston rises on the compression stroke. Note: If you have brazing or soldering equipment, you can make this tool using an old spark plug shell with the porcelain, electrode and ground strap removed. Braze or solder a metal whistle to the metal plug she
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Hi, I've been dealing with an overheating behavior in my YJ 1989 Wrangler (4.2L with all emissions control hooked up except pulse air system, Carter BBD, Auto Trans). Long time ago I've replaced cooling fluid, It was 100% tap water that is the worst choice due to corrosion; so I decided to replace it by an ethylene glycol mix as you can find them ready to pour into your cooling system. I don't know if the coolant was poor quality but immediately after replacing the fluid I was getting the engine overheated. Perhaps it was air trapped in the system as the guy replacing the coolant did all the p
