WEICHAI & PSI SERVICE MANUALS AVAILABLE ONLINE AT FLYPARTSGUY.COM Weichai America Corp. 9.6.4 Inspection and maintenance of valve ① Check whether valve rod and its end faces are worn; ② Check whether valve conical surface is worn or damaged; ③ Check valve conical surface and retainer end faces for carbon deposit; Revision: August 2019 46 GET YOUR WEICHAI & AFTERMARKET SERVICE PARTS AT FLYPARTSGUY.COM