SAFARI

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.