New Aftercooler Core Has Copper-Nickel Tubes For Increased Strength
Usage:
D348 Industrial Engines
Description of Change: A new aftercooler core assembly is used in the aftercooler group on D348 Engines with Serial Numbers 57K1287-Up. The new core has copper-nickel tubes in comparison with the former core which had copper tubes. It is stronger to prevent possible cracks at the header plate.
Formerly, stresses were high enough in some conditions to cause failure of the tubes near the header plate. This type of failure permits coolant to leak into the air inlet system.
Adaptable As: The new 5N8208 Core Assembly is a direct replacement for the former 2N7527 Core Assembly, which is canceled. A quantity of two is required per engine.
Caterpillar Information System:
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1981/01/28 6V3150 Engine Pressure Group And 6V3121 Multitach Group Are Available For Testing Engines
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1981/01/21 Exhaust Elbow Support Improved
1981/01/21 List Of Service Publications
1981/01/21 Use 2P2333 Manifold Sealer On Exhaust Manifold Slip Joints (Junction) During Assembly
1981/01/21 Larger Plug Used In The Ends Of The Rocker Arm Shaft Assembly
1981/01/21 New Bearing Sizes And Identification Codes For AiResearch Remanufactured Turbocharger Cartridges
1981/01/28 New Camshaft Has Improved Profile (Shape) Of Exhaust Cam To Extend Service Life
1981/01/28 New, One-Piece Valve Lifter Used
1981/01/28 Corrected "5.4" 60°V Main Bearing Selection Guide" Is Now Available
1981/03/04 High Concentration Of Aluminum In Oil Analysis Can Be The Result Of Rocker Arm Support Wear
1981/03/04 Changes Have Been Made To Caterpillar Service Literature
1981/03/04 Two New Oil Filter Assemblies Available; Always Use Correct Oil Filter And Follow Caterpillar Change Intervals
1981/03/04 List Of Service Publications
1981/03/04 Later Pistons Have A Smaller Number Of Drain Holes In Oil Ring Groove
1981/03/04 Pipe Plug Added To Rear Of Cylinder Block Prevents Oil Leakage Into Flywheel Housing
1981/03/04 Check Oil Level Carefully To Prevent Operation With Too Much Oil In Engine Crankcase
1981/03/04 Two New Exhaust Manifolds Available For Replacement Of Single Rear Manifold To Prevent Broken Studs
1981/04/01 Special Studs And Nuts Available For Exhaust Manifolds On Engines Used In Heavy Load Conditions