I usually service my Mitsubishi L200 Sportero 4x4 5FWD Diesel at Mechanic A, but I had not for several months. Needing a service, I tried another mechanic, Mechanic B, who did the usual 'tune-up'. Two weeks after that, while driving, the power-steering stopped working. Upon investigation, I realized that all of the belts (alternator, power steering, A/C) were either destroyed or twisted and that the crankshaft bolt (the bolt that holds all of the pulleys at the front of the engine) was missing.
- What could cause this bolt to come loose?
- Is Mechanic A at fault, or Mechanic B? Mechanic A says they use 'lock-tight' and air tools to tighten bolts, and if it were only slightly loose, it would come off completely in a week or two, not last for the several months it did since their last service. Mechanic A also surmised that Mechanic B, while trying to do other stuff in the engine, might move the engine around in the engine bay somehow and loosen the bolt.
I don't know who to believe. What do you guys think?
UPDATE 01: The bolt is not missing - the head of the bolt broke off, leaving the rest of it inside.