The alternator stopped working on my 1998 Ford Expedition. This happened
at night and I had to drive approximately 15 or 20 miles on battery power.
I have replaced the alternator but now there is a slapping sound coming
from the front of the right valve cover. I have placed my hand on the
valve cover and I can feel a vibration as if the timming chain is hitting
against the valve cover. If the timming chain is hitting the valve cover,
what could be the cause? Sorry, I forgot to mention that the engine is a