I forgot to post these
2 Vacuum Pumps destroyed timer Bushing Identified as the problem
http://www.mbca.org/forum/2013-12-29/why-are-these-vacuum-pumps-being-destroyed
2 Vacuum Pumps destroyed timer Bushing Identified as the problem
http://www.mbca.org/forum/2013-12-29/why-are-these-vacuum-pumps-being-destroyed
My question What in particular causes vacuum pump failure?
http://www.peachparts.com/shopforum/diesel-discussion/204187-what-particular-causes-vacuum-pump-failure.html
When you hear an odd noise up front check the vacuum pump first by listening with a Mechanics Stethoscope or some substitute to see where the noise is coming from.
Tapping sound caused by Ball Bearings falling out of Vacuum Pump
http://www.peachparts.com/shopforum/diesel-discussion/340095-vacuum-pump-ball-bearings-fell-out-now-what.html