Duty cycle Ford V-10 (( update bottom post))

jus2shy wrote:

All I could afford wrote:
I was hoping for a long trouble free life on my work truck, a 2013 Ford F550 with the 3 valve per cylinder V10. We bought it new last April and it just turned 133,000 miles! Unfortunately it just suddenly last week developed a nasty tapping noise from the upper passenger site of the motor. I have a feeling it's a valve lifter, but boss hasn't yet taken it anywhere, nor have we pulled the valve cover to take a look. I'm disappointed because this truck has recieved fresh Motorcraft semi-synthetic oil every month since new. I hope this is an isolated insident

Does the engine also diesel a little bit when idling? Typically, tapping noises like that are caused by the cam phasers. It's probably the only weak point left on the Mod motors after the spark plug fix. They tend to get loud as they get older, but they haven't failed until the engine actually runs crappy. Best to have your mechanic confirm what the issue is, but typically tapping is caused by the cam phasers and not so much the the valves or buckets/lifters.