The fan dive is a hydraulic motor running 10w 30 motor oil driven from a hydraulic pump (Masive power steering pump) off the front timing gears of the engine, just under the injection pump.
When the seal go's on that fan drive, it sprays hot engine oil (10W 30) all over the exhaust manifold and turbo. That only go's on so long before it catches fire. Then the fan drives the flames into a blast furness.
Also, the rear engines are often not washed in the engine bay. Dust from dirt roads mixes with oil to form a layer sometimes 6 inches thick down on the lower engine and transmission blocks / oil pans. Perfect mix for a nice hot fire.
"Don't argue with stupid people. They will just drag you down to their level, and beat you up with experience."
Patently waiting for the apocalypses to level the playing field in this physiological game of life commonly known as Civilization