Estimated to ship direct from manufacturer on 08/17/23, pending manufacturer availability. 1999-2006 Jeep Grand Cherokee, TJ, Wrangler. Live-Run Testing, utilizing Data Acquisition with other assessments to ensure reliability of compression, vacuum, oil pressure, actuator testing, and blacklight leak testing. ATK Engines Remanufactured Crate Engine for 1999-2006 Jeep Models with 4.0L L6.Oil pressure and flow are measured with solenoid on and off throughout a full RPM sweep of the remanufacture oil pump operating range. 100% of the Chrysler 3.6L remanufactured oil pumps are tested on state-of-the-art, JASPER designed, stand-alone oil pump testing equipment.100% installation of NEW engine oil cooler, and for ease of installation, assembly includes: oil temperature sensor, oil pressure sensor, knock sensor, and adapter harness.Block is CNC machined for 100% installation of steel-threaded inserts for head bolts, increasing strength over the original aluminum design, which pull out.Thicker, D-shaped, PTFE (polytetrafluoroethylene) coated Multi-Layer Steel head gaskets are installed, with new head bolts, along with better block and head surface finishes (50-150 Rz), to prevent leaks and maintain the correct compression ratio.JASPER designed pistons have 20% more pin bearing surface area than the original design to improve stability and prevent piston slap.An accumulator groove is machined into the piston, decreasing the pressure between the 1st and 2nd ring land, preventing the upper (compression) ring from unseating at higher RPMs.JASPER installs a robust two-piece 2.0mm oil ring for improved oil control and uses a steel top ring which includes a PVD and DLC coating for longevity and less friction.JASPER’s Chrysler 3.6L piston design includes additional oil return holes (12 total) to increase oil drain back, to reduce oil consumption, and prevent the oil rings from sticking.JASPER® engineered pistons include a smooth, fully-machined, anodized crown that provides a thermal barrier and reduces carbon buildup.JASPER® engineered pistons include a graphite coated skirt and 28% more major thrust bearing area to help prevent dry startup and piston scuffing. 100% installation of high-strength, Class 12.9 rod bolts to prevent stretching, which can lead to rod bearing failure.
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