Pull off your Vacuum Pump and check the Lever and Bearing that are on it. Look where the long skiny Bolt goes through the Piston and see the Pison is cracked around where the Bolt is.
Check the face of the Timer for damage.
Drain the Oil and drop the small Oil Pan and see if there is fragements in the Oil Pan.
Check the Oil Pump Chain Tensioner Shoe, Spring and the little Snap
Ring that keeps the Shoe in place.
Look at as many Oil Spray Nozzles as you can see.
If it turns out to be the Vacuum Pump:My question What in particular causes vacuum pump failure?
What in particular causes vacuum pump failure?