Quality for many products went south or east a number of years ago.
A service station I worked at years ago, brother to the owner, had a backhoe and dump truck. The truck was a Ford with a 391 engine. The crankshaft front pulley came loose a couple of times, so I torqued it again. Then the bolt came out on the road. I was able to get another bolt and torqued it in with loctite. Three days later it stalled while driving so he stepped on the clutch. With a load on there is lots of momentum, so he let engaged the clutch again. The angle on the fracture on the crankshaft just behind the #1 main bearing pushed the front piece of thecrank out the front with the main bearing web still bolted together and on the crankshaft. Timing cover was a writeoff as well. Those 391 engines had steel forged cranks and the front snout is larger diameter to support driving the air compressor and other truck options. Seems for some reason the crank developed a crack that allowed excess torsion to the torsional damper causing the bolt to work loose. When I loctited the bolt and started it up there was no discernable noise and the timing only varied like you expect with a bit of a worn timing set.
