I COOLING SYSTEM GRlLLE OIL SYSTEM I 1 550 SEAL Engine Oil Cooler V A I I I 85 89 M1 463015 2 80 SEAL ENG OIL CLR HOSE 04 050 PG1 21 16 90 91 LM1 4 63015 2 80 SEAL ENG OIL CLR HOSE 04 050 PG1 21 16 1 609 I PIN PLUG SPRING V ALVE Oil Pressure Regulator S I 85 90 M1 2 5E 838839 1 12 PIN OIL PRESS REG VALVE SPRING STOP PGO 19 49 87 89 M1 4 32 838839 1 12 PIN OIL PRESS REG VALVE SPRING STOP PGO 19 49 I 90 91 LM1 4 3B LU2 4 32 LB4 838839 1 12 PIN OIL PRESS REG SPR PGO 19 49 85 89 M1 4 3N Z i 3704871 1 98 PLUG OIL PRESS REG VALVE SPRING I STOP PGO 19 50 90 91 LM1 4 3B LU2 4 32 LB4 3704871 1 I 98 PLUG OIL PRESS REG VLV BORE PGO 19 50 85 89 M1 4 3N 2 3814903 1 43 SPRING OIL PRESS REG VALVE PGO 3 48 85 90 M1 2 5E 3814903 1 43 SPRING OIL PRESS REG VALVE PGO 3 48 I 90 91 LM1 4 38 LU2 4 32 LB4 3814903 1 43 SPRING OIL PRESS REG VLV PGO 3 48 85 89 M1 4 3N Z 3702366 1 1 75 VALVE OIL PRESS REG PGO 19 51 85 90 M1 2 5E 3829433 1 1 75 VALVE OIL PRESS REG PGO 3 53 90 91 LM1 4 38 LU2 4 32 LB4 3702366 1 1 75 VALVE OIL PRESS REG PGO 19 51 1 639 BEARING GEAR RETAINER SHAFT Oil Pump r 85 90 M1 2 5E 10004842 1 1 45 BEARING OIL PUMP UPR SHF LWR V PGO 4 98 85 90 M1 2 5E 10008555 1 1 35 BEARING OIL PUMP UPR SHF UPR PGO 4 95 85 90 M1 2 5E 1962052 1 23 45 GEAR OIL PUMP DRIVE SHAFT 02 374 PGO 4 96 85 89 M1 4 3N Z 3764554 1 46 RETAINER DISTR TO OIL PUMP SHAFT 8 A PGO 19 46 90 91 LM1 4 38 LU2 4 32 LB4 3764554 1 46 RETAINER DIST TO O PUMP INTER PGO 19 46 85 90 M1 2 5E 1977131 1 11 92 SHAFT OIL PUMP DRIVE UPR PGO 4 97 85 89 M1 4 3N 2 3998287 1 7 55 SHAFT DISTR TO OIL PUMP INTER PGO 19 45 90 91 LM1 4 38 LU2 4 32 LB4 3998287 V 1 7 55 SHAFT DIST TO OIL PUMP INTER PGO I 19 45 1 652 BOLT PUMP Engine Oil S W I I 85 86 M1 4 3N Z 1ST DES 3892678 1 70 BOLT OIL PUMP SCREEN 7 16 14X2 A O0 1ST DES IS 2 0 LONG AND USED I FOR ENGINES WHERE OIL MOUNTING I SURFACE ON BRG CAP HAS POCKET I DEPTH OF 0 03 OR LESS PGO 19 54 87 88 M1 4 32 2ND DES 10046007 1 75 BOLT OIL PUMP 2ND DES IS 2 36 LONG USED FOR ENGS W POCKET DEPTH 8 OF 032 0 42 PGO 35 25 89 M1 4 32 10046007 1 75 BOLT OIL PUMP PGO 35 25 90 91 LM1 4 3B LU2 4 32 LB4 10046007 1 75 BOLT O PMP 7 16 14X2 36 PGO 35 25 85 90 M1 2 5E 10008206 1 N L PUMP W SCREEN OIL PGO 3 45 85 89 M1 4 3N 2 10055850 1 N L PUMP OIL PGO 19 47 90 91 LM1 4 3B LU2 4 32 LB4 10055850 1 I N L PUMP OIL PGO 19 47 1 656 SCREEN Oil Pump 85 89 M1 4 3N 2 3764113 1 6 75 SCREEN OIL PUMP PGO 19 53 90 91 L1 4 32 LB4 10054773 1 6 75 SCREEN O PMP REO D WHEN USING I GOODWRENCH ENG 10121027 PGO B 35 26 90 91 M1 4 3B LU2 4 32 LB4 3764113 1 6 75 SCREEN O PMP PGO 19 53 1 723 BOLT COVER PLATE Oil Pump A S 85 90 M1 2 5E 192988 4 s 37 BOLT OIL PUMP CVR 01 657 PGO 3 49 85 90 M1 2 5E 3792507 1 3 30 COVER OIL PUMP PGO 3 50 I 85 89 M1 4 3N 2 10055887 1 15 50 COVER OIL PUMP PGO 19 48 90 91 LM1 4 38 LU2 4 32 LB4 10055887 1 15 50 COVER O PMP PGO 19 48 85 90 M1 2 5E 10031030 1 3 80 PLATE OIL PUMP DRIVE SHF CVR PGO 4 100 1 724 GASKET Oil Pump Cover l I P 85 90 M1 2 5E 3789970 1 63 GASKET OIL PUMP CVR PGO 3 51 85 M1 2 5E 10031029 1 22 GASKET OIL PUMP DRIVE SHF CVR PLT 1991 GENERAL MOTORS SERVICE PARTS OPERATIO NS LT TRUCK 52M 1 550 1 724 142 1 91 I