ENGINE 115 Fig. 12 Vacuum Pump cylinder head (New) Vacuum pump suction unit (New) 77 mm dia. 9 Insert suction valve components into cylinder head and screw on suction valve cap with adapter, 321 589 02 07 and tighten to specified torque. Fig. 11. 10 Insert delivery valve components into cylinder head and screw on delivery valve seat with adapter, 312 589 09 07 Fig. 12 and tighten to specified torque. NOTE : Although valve discs and springs of the suction and delivery valves are identical, these parts should be assembled in correct sequence as shown in Fig. 6 as they are functionally different. Suction port in the head is marked ‘S’. Fit suction valve seat with ground surface on top. Centralise valve disc on seat. Place spring on disc and screw in suction valve cap carefully. If in this process disc and screw in suction valve cap carefully. If in this process disc has shifted, cap cannot be screwed home fully. In such a case, dismantle and carefully assemble the parts again. Delivery port in the head is marked ‘D’. Assemble delivery valve in proper sequence viz. spring housing, spring, valve disc and valve seat. Valve seat ground surface should face valve disc. 11 Install cylinder head on cylinder sleeve using new gasket and tighten mounting bolts to specified torque. 12 Crank engine 2 to 3 times and ensure that compressor piston does not touch cylinder head. 13 Install air inlet and outlet connections. To avoid wrong connections the inlet side of the head is provided with M22 thread and outlet side with M20 thread.
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