1990/07/01 Caterpillar


Improved Material Prevents Sagging Of Rear Manifold Section

Usage:


3516 High Speed Generator Set, Industrial Engines

Description of Change: The rear manifold sections of the above engines use a higher temperature material. The rear manifold section supports the turbocharger. The above engines use a larger turbocharger than the rest of the 3500 Family Of Engines. It was possible that the former exhaust manifold could sag, because of the heavier turbocharger, if the exhaust temperatures were excessively high. If this did happen, misalignment of the turbocharger-to-exhaust elbow could allow exhaust leakage. The new manifold will operate at higher exhaust temperatures without sagging.

Adaptable To: The part number of the improved 1W5317 Right Hand Manifold, and 1W5318 Left Hand Manifold did not change. The improved manifolds are effective with 25Z1723 and 27Z675 Engines and are adaptable to earlier engines.

Caterpillar Information System:

1990/07/01 Boss Added To Keep Bolts From "Bottoming Out" In Expansion Tank Groups
1990/07/01 Special Instruction SEHS8700 Available For Installation Of Engine Flexible Mounting Group
1990/07/01 New Jacket Water Heater Groups Have New Thermostat
1990/07/01 New Water Regulator Prevents Leakage
1990/07/01 Valve Lifters Can Be Removed Without Removing Cylinder Heads
1990/07/01 Improved Turbocharger Bearing Kit Available For Parts Service
1990/07/01 New Spark Plug Seal Used
1990/07/01 Powdered Metal Valve Guides Provide Increased Service Life
1990/07/01 Solenoid Contacts May Corrode In 3T2648 Marine Starter
1990/07/01 Engine Rack Control Assemblies Improved
1990/07/01 New Fuel Setting Screw Cover And Bolt
1990/06/01 "Ugly's Electrical-References" SEBD0983, Now Available
1990/07/01 New Turbocharger Gas Inlet Housing Used
1990/07/01 Correct Position Of Regulator Housing On Combined Water Lines Group
1990/07/01 Welding On Fuel And Hydraulic Tanks
1990/07/01 Electrical System Damage From High Voltage
1990/07/01 New Digital Tachometers Available As Attachments
1990/07/01 List of Service Publications
1990/08/01 Changes To Exhaust Manifold Expansion Sleeves And Bolts
1990/08/01 New Manifolds And Bellows Assemblies Used In Exhaust Manifold Group
1990/08/01 New Aftercooler Gaskets Help Maintain Constant Bolt Torque{1063,1079}
1990/08/01 Stronger Fan Guard Resists Vibration Damage
1990/08/01 Improvements Reduce Vibration To The Low Water Level Switch On Expansion Tanks
1990/08/01 New Caterpillar Parts Identification Label
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