I know there are a lot of threads about rebuilding the early style vc but after looking around I can't find the piece of info I'm looking for. I rebuilt my vacuum and have had weak vacuum ever since. I am nearly positive that I put together everything right, but the center bolt isn't the right tightness. After trying trial and error I am tired. I want to know if anybody has the proper torque specifications? I really don't want to tear out the ps steering belt and fan if I don't have to. This way I can just take off the front of the pump. Thanks for your help!

I have read in the forum that on several occasions the O-rings/seals that come in some kits and go under the little circular Vacuum Pump Valves are not fat enough to seal.
The result was poor or no Vacuum.
Some simply reused the old O-rings.

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84 300D, 82 Volvo 244Gl Diesel

In the FSM - Torque Self-locking Hex Nut on Piston, 9 Nm

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84 300D, 82 Volvo 244Gl Diesel

What year/style pump?

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

It is a 1979 240 D.

That should have the early diaphragm pump. What kind of vacuum readings are you getting from the pump? Did you install the check valves in the right direction?

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

I'm fairly certain I installed them in the right direction I am getting 10 hg off the white nipple coming out of the power booster cable.

Yes, unless you live at 10,000 ft, that is low. Have you checked it directly at the pump. Your brake booster might be leaking.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13