1981/03/06 Caterpillar


Two New Exhaust Manifolds Available For Replacement Of Single Rear Manifold To Prevent Broken Studs

Usage:




3408 Engines In All Applications

Description of Change: Two new exhaust manifolds are available for replacement of the single rear manifold on earlier 3408 Engines. Installation of the two new manifolds will prevent broken manifold studs, which have been a problem for some customers. The new manifolds have a slip-joint connection to prevent stresses on the studs caused by manifold expansion at high temperatures.

Adaptable As: The new 7N5218 Exhaust Manifold (Rear) and 7N5219 Exhaust Manifold (Center) used together, are a direct replacement for the former 4N1676 Exhaust Manifold (Rear) which is canceled.

Caterpillar Information System:

1981/03/06 Do Not Adjust The Fuel Setting Or High Idle Higher Than Necessary
1981/03/06 Modification Of Flywheel Prevents Loose Clutch Pilot Bearing
1981/03/06 Later Pistons Have A Smaller Number Of Drain Holes In Oil Ring Groove
1981/03/06 New Turbocharger, Turbocharger Oil Lines Group And Aftercooler Air Lines Group Used
1981/03/06 High Concentration Of Aluminum In Oil Analysis Can Be The Result Of Rocker Arm Support Wear
1981/03/06 List Of Service Publications
1981/03/06 Changes Have Been Made To Caterpillar Service Literature
1981/02/04 New, One-piece Valve Lifter Used
1981/02/04 Inspection And Test Procedures To Follow When Fuel Ratio Control Does Not Operate Correctly
1981/02/04 Different O-ring Seal Now Used On The Oil Pump Suction Tube
1981/02/04 New Front Housing Assembly And Gaskets Used
1981/02/04 6V3150 Engine Pressure Group And 6V3121 Multitach Group Are Available For Testing Engines
1981/03/06 Check Oil Level Carefully To Prevent Operation With Too Much Oil In Engine Crankcase
1981/03/06 New O-ring Seal Used In Egr (exhaust Gas Recirculation) Control Has Better Resistance To Heat Damage
1981/03/06 New Governor Spring Available For Specific Engine Applications
1981/04/09 Low Engine Temperatures: Install Check Valve
1981/04/09 6V4163 Bit And 6V4164 Driver Now Available For Removal Of Bolts For Flyweight Carrier
1981/04/09 Correction To Torque Specification For Locknuts On Valve Clearance Adjustment Screws Of Engines Equipped With Jacobs Engine Brakes
1981/04/09 Special Studs And Nuts Available For Exhaust Manifolds On Engines Used In Heavy Load Conditions
1981/04/09 Two New Oil Filter Assemblies Available; Always Use Correct Oil Filter And Follow Caterpillar Change Intervals
1981/04/09 Cooling System Cleaner Removes Rust And Corrosion
1981/04/09 Correct Refill Capacity For Engine Oil
1981/04/09 6V3197 Spacer, 6V3041 Tool Group Available For Use During Removal And Installation Of Piston Pin Bearings
1981/04/09 Clean Electrical Contacts In Exhaust Gas Recirculation (e.g.r.) Switch Group And Cover Assembly Before Installation
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