I borrowed a UV light from a mechanic friend and bought some oil dye. My friend told me to use two bottles, but I only used one. I should have use two like he said. I had some difficulty seeing the dye. I tracked it down to the lower gallery that feeds the main bearing. I pulled the plug and wrapped teflon tape around it (4 turns) and tightened it down. I then put the backing plate and flywheel on and I put two bolts to hold the starter on and started it up. It really was not that loud. I let it idle about 5 minutes and no leak.

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Jim
82 300SD saved from scrap yard, 86 front clip,85 500SEL rear end,86 wheels.