Re: 4.0 SOHC Crankshaft Seal/Knocking Problems
Sounds like a rod knock. My 3.0 exhibits this erratic random noise, but it has slowly gotten worse and worse. (Don't leave seafoam in too long!) you can identify if it's a rod knock by unplugging the spark plugs one by one while it's running up at the coil pack and see if the noise goes away or lessens.
Yes there are bearings on all the crank journals, there are 6 rod bearings, and 4 main bearings. The main hold the crank down into place, while the rods spin around the crankshaft and are connected to the pistons, which is why if it's a rod knock it'll lessen if there's no spark slamming it back down.
Just realized this thread is old but still posting. Somebody else out there may find the info valuable!
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