High-temperature fluoroelastomer polymer (FPM) rear seal is installed to prevent oil leaks. For worry-free auto repair, log in to the JASPER Engines and Transmissions online catalog and get a price for the perfect remanufactured engine, transmission, or differential for your car, truck or boat.To prevent bearing damage, crankshafts are machined and micro-polished to JASPER’s exact and proven specifications for improved, more precise oil tolerances and longer bearing life.Nitrided valve upgrade improves heat resistance and reduces valve guide wear.They knew my 4.0 motor very well and did a great job on it. Or you can remove the motor and take it to a local machine shop that knows the engine. Upgraded rear cam bearing, with larger oil hole for improved oiling. Jasper motors are good, 3 year - 100,000 mile warranty.Additional center skirt drain backs provide 3X more oil return. My husband Wil & I purchased a 4.0 remanufactured engine for our 2002 Jeep Grand Cherokee and it is running like a new one.Graphite coated piston skirts help prevent piston scuffing and dry start-up.Twice the piston skirt (thrust area) for improved durability and reduced piston scuffing tendency. Has anyone had any experience with a Jasper engine, thats what the dealership.Break your Jasper engine in with the manufacturer’s recommended SAE-spec engine oil. Full-floating pin to reduce pin bore scuffing. The 3. Your Jasper engine should come with a new radiator and other key support items.and what makes it illegal to put a newer engine in my jeep edit: it is out of a 96 cherokee but the engine itself is about 4 years old -Black Betty- 4. ![]() Re-engineered JASPER piston design features: the jasper will have less power i would of thought they would have a little bit more if not just as much. ![]() ![]()
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