TM  10-3930-643-34 ENGINE,  FUEL,  EXHAUST  AND  COOLING  TROUBLESHOOTING  AND  MAINTENANCE. 4-8. Oil Filter Base. (Sheet 2 of 4) REMOVAL NOTE Tag all hose and tube assemblies before disconnecting to aid in installation. 1. Using a 3/4” open end wrench, disconnect  turbocharger  oil  line  (1) on front, left side of engine. 2. Using a 9/16” socket and socket wrench handle, remove six bolts (2), washers (3), oil filter base (4) and gasket (5). Discard gasket (5). Remove all gasket material from mounting  surfaces. NOTE l On vehicles S/N 2001 and above, slide oil filter base and gasket out from behind oil sampling valve bracket. l Do not mix bolts with any other hardware. One  bolt  hole connects  oil  pressure gallery and requires special bolts to prevent leaks. 3. Using a 3/4”   open end wrench, remove elbow (6). 4. Using a 5/8”   socket and socket wrench handle, remove plug (7), gasket (8), spring (9) and check valve (10). Discard gasket (8). Remove all gasket material  from mounting surfaces. Go to sheet 3 4-65