4.0 Oil Pump Longevity
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doublechaz (09-30-2020)
#17
Old fart with a wrench
Only a broken valve spring (one coil) would cause a lifter to not follow the cam, but I'm pretty sure you'd hear that up top from the rocker being loose.
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318SixPack (10-01-2020)
#18
Seasoned Member
Thread Starter
An oil analysis is a good next step. I just changed the oil about 100 miles ago so I'll get a sample of it at next oil change. I change oil quarterly and am currently putting about 8500 miles/year on it. The sound is definitely coming from below the rocker box but I plan to remove the cover and get an eyeball on the condition of the top end in a week or so. A thorough cleaning of the doghouse is in order, anyway.
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318SixPack (10-01-2020)
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