push rods? not in a Mercedes engine...
a jammed/faulty hydraulic lifter will cause a tapping sound.
| Are hydraulic lifters, cam shafts, push rods, and valves consider to be
| "internally lubricated" parts of the engine? The reason I am asking is
| I've noticed that my '99 E320 (with 91K miles) has a slight tap when
| I assume that this is due to one of the items I mentioned above (lifters
| camshaft being my first guess) and I still have the car covered under a
| Starmark warranty that states that "internally lubricated" engine parts
| covered. So before I take the car into the dealership I wanted to verify
| belief that these are indeed internally lubricated.