TM 9-2320-289-343-42.FUEL INJECTOR PUMP HYDRAULIC HEAD MAINTENANCE (Con’t).3.Remove rotor (16) assembly fromroller testing fixture (20), Holdingrotorassembly at base,installdelivery valve (24), spring (26), andnew delivery valve stop (27) withscrew (28).NOTEEnsure that rollers (19) and shoes(23) remain in their slots wheninstalling rotor (16) assembLy inroller testing fixture (20).4.Connect air hose (22) to air inlet holein roller testing fixture (20), andsupply 40-100 psi (276-690 kPa) ofcompressedair.Installrot orassembly in roller testing fixture on airinlet side.5.Check dimension between between rollers (19). Dimension should be 1.9765-1.9775 in.(50.203-50.229 mm). Adjust leaf spring screw (21) until proper dimension is obtained.Disconnect air hose (22) from air inlet hole.NOTEEnsure that rollers (19) and shoes(23) remain in their slots wheninstalling rotor (16) assembly inhydraulic head assembly (10).6.Installrotor(16) assembly inhydraulic head assembly (10).NOTEWhen installing cam ring (8),ensure that arrow on cam ring ispointing clockwise and that notchon camring faces front ofhydraulic head assembly (10).7.Install cam ring (8) on hydraulic headassembly (10). Install weight retainerhub (18) and weight retainer (7) oncam ring. Install snapring (17) onrotor (16).3-153
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