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Diaphragm pump bolt torque?

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tombro44

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maybe not the right forum for this q, but i´ll give it a shot anyway. took an ac diaphragm pump apart to clean and troubleshoot low output pressure. it´s for fuel injection, so output pressure supposed to be in mid 20 psi range. anyone know the bolt torque to compress the halves together and squeeze the diaphragm or have an ac mechanical pump service manual in pdf. want it to be tight enough but not crush the diaphragms. thanks!!!
 

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