I am going too use the RED thread lock next time on the little "center" bolt and be sure not too torque it too much

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"

um, is that a good idea? 500°F is needed to take it apart next time...

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

I dono, guess I would find out if I ever had to take that bolt out of the 'disc', and if it didn't come apart a little heat wouldn't hurt anything, diaphragms already toasted. I think most "short lived" diaphragm repairs are caused by over torquing, although there was a guy a while back that didn't tighten it enough and it came adrift. If I was doing it for someone as a job, I wouldn't, but I would try red thread lock on my own vacuum pump diaphragm.

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"