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Failed 5.4L After Shop Changes Oil

Last Modified : Mar 30, 2021

Had a truck roll in from an Independent shop the other day. It was a F150 with a 5.4L Triton engine. Apparently the techs changed the oil and upon restart, the truck no longer had any oil pressure. It ran fine, but sounded horrendous. Man, I wish a took a video of the truck before we tore it down. The sound it made would give you nightmares!

Pulled the oil filter off and it was dry - no oil whatsoever. I was ready to say it needed a black box, but my overly enthusiastic boss wanted me to tear it down more. Pulled the valve covers and noticed both guides were broke. Pulled the front timing cover off to see the chains flapping in the wind. Nothing but the cover was holding them in place. It's amazing it ran, and ran well aside from the noise. The chains were grinding into the front cover. I removed the oil pump expecting to find broken pump drive gears, but they weren't broke. Actually, it only appeared that the relief valve was stuck open.