This is the second time in 35,000 miles that the piston has broken in the vacuum pump.

Car is the '79 300D with a late-style pump.

Has anyone else had this type of failure? The boss where the bolt passes thru fractured and broke completely away from the rest of the piston.

I have the valve kit w/ O-rings, just need the piston for now.

On the other hand, I also have access to a CNC milling machine, and given enough time and demand, I would be able to produce these fom 6061 T6 aluminum instead of the weaker cast materials currently used.

If anyone is interested, let's set up a poll and find out what a good production run this would be-- and perhaps I will be able to supply a competetive price.

Any thoughts?

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Nate Stanley
(Currently Benzless)
1985 F-250 6.9l 170K
2009 SCION XB 36.5K
2003 LS430 78K
2012 Kubota B 2320