Makes you long for the days of Engines that had only Timing Gears and Pushrods istead of Timing Belts or Chains.

I managed to drop a Screwdriver into the Timing Belt on the Volvo (I had long ago removed the several piece Timing Belt Guard).
It happend at idle speed and I bent 2 Valves and Cracked several Tappets. What made it really sad was this was about 2 years after I had rebuilt the Block.
My carlessness could have ruined a lot of work.

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84 300D, 82 Volvo 244Gl Diesel