1993/01/18 Caterpillar

New Cylinder Head Group Used To Help Reduce The Amount Of Oil On The Valve Stems {1102,1109,1104}

Usage:

3516 (4MJ) Marine Engines

Description of Change: A new cylinder head group is used. The new cylinder head group includes a new rotocoil assembly. The new rotocoil assembly includes a shield that helps reduce the amount of oil on the valve stem. The shield will help minimize the amount of oil that runs down the valve stem and past the valve guide that can lead to slobber during prolonged periods at engine idle.

Location of new 4P2520 Rotocoil Assembly in the new 4P2470 Cylinder Head Group. Components of the 4P2520 Rotocoil Assembly. 4P2521 Rotocoil Assembly (1). 4P2522 Shield (2).

Adaptable To: The new 4P2470 Cylinder Head Group is a direct replacement for the former 7C8120 Cylinder Head Group in the engine arrangement. Sixteen new 4P2470 Cylinder Head Groups are required for each engine. The new cylinder head group is in effect with 3516 Marine Engine 4MJ38. The only difference between the new and former cylinder head group is the addition of the 4P2522 Shield to the 4P2521 Rotocoil Assembly.

The new 4P2522 Shield (2) can be added to the 4P2521 Rotocoil Assembly (1) on the former 7C8120 Cylinder Head Groups or the Remanufactured OR2880 Cylinder Head Groups used on earlier engines. Four new 4P2522 Shields are required for each cylinder head. The 4P2520 Rotocoil Assembly is made from a 4P2521 Rotocoil Assembly (1) and 4P2522 Shield (2). See the illustration.

Caterpillar Information System:

1993/01/18 New Exhaust Manifold Group Will Help Reduce Vibration On Bellows {1059}

1993/01/18 New Grommets With Higher Temperature Capacity Used In Clamp Assemblies {1307,1052}

1993/01/18 New And Remanufactured Fuel Injector Reference {1290}

1993/01/18 Cylinder Pack Puller Groups Improved {0705,1239}

1993/01/18 Part Number References For 0R2818, 0R2819, And 0R3231 Remanufactured 3208 Truck Engines {0374}

1993/01/18 New Videotape "Detection of Air and Combustion Gases in the Cooling System" Available {0374,1350}

1992/12/21 New Bellows Assemblies Used In Turbocharger Groups{1052,1059}

1992/12/21 Modifying Former 2W8888 Rocker Arm Shaft For Use With New 8T7581 Rocker Arm Shaft Bolt{1102}

1992/12/21 New Cylinder Head Bolt Tightening Procedure{1100}

1992/11/30 New Cast Iron Deaerators Replace Former Aluminum Deaerators{1350}

1992/11/30 Procedure To Clean High Performance Marine Engine Air Filter{0374,1054}

1992/11/30 Procedure To Replace Cylinder Head Gasket{1124}

1993/01/25 New Connecting Rod Bearing Used In Piston And Rod Groups {1219}

1993/01/25 Special Instruction For Installing VR3 Voltage Regulator On SR4 Generators Now Available {4450}

1993/01/25 Drive End Bearing Service For 50/75 Amp Brushless Alternators {1405}

1993/01/25 Unit Injector Tip Seal Deterioration {1290}

1993/01/25 Check Engine Water Pump Impeller Face Clearance If The Engine Experiences Symptoms Of Overheating {1361}

1993/02/01 New 9U6101 Lower Pilot Reamer Group Available{0670,1125}

1993/02/08 Maintenance Tips For 6I0799 Exhaust Restrictor; Additional Spring Improves Performance Of 6I0799 Exhaust Restrictor{1119,1061,1088}

1993/02/15 Procedure To Determine Idler Height {4159}

1993/02/15 Aftercooler Core And Turbocharger Compressor Wheel Cleaning Interval {1317,1052,1054,1060}

1993/02/15 New Breather Group And Fumes Disposal Group Help Reduce Oil In Blow-By Fumes {1317}

1993/02/15 New Tank Assemblies Used In Expansion Tank Groups; New Pressure Cap; New Coolant Recovery System Available {1354,1392}

1993/02/15 Maximum Wiring Harness Extension Length Specification {1408,7451}