If you can drop pan and wiggle rods, you have room to plastigage the rods and mains, look for scratches. This may take a couple hours shop labor time but you"ll have a idea of what needs to be done. I had rear main seal replaced during clutch job of my 4.0- wasn"t that much more $ and labor since it was up anyway. Wasn"t cheap to start with compared to clutch on older dodge pickup but crank got a quick visual and rods were test wiggled, oil pump pickup checked and wiped, pan wiped. Knocks can vary- could be wrist pin, could be electrical- Ford van last week was a spark plug with way burned electrode that sort of sounded like rod knock. Number one sparkplug under bracketing may have been skipped during tuneup couple years back-check your electrics, etc before scrapping old Jeep-- you should have another 50,000 mle or better. RN
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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