1987/05/18 Caterpillar

New Precombustion Chamber Seal Available{1100,1106}

Usage:

All D346, D348, D349 Engines

Reference: This article supersedes a similar article in Service Magazine, September 2, 1985, "New Precombustion Chamber Seal Available".

Description of Change: The former article stated that a new precombustion chamber seal was available to give improved service life in high temperature applications. The new seal is made from a different material that resists high temperatures better. According to continued reports, the former seal still allows coolant leakage into the lubrication oil system in high temperature applications.

Caterpillar now recommends using the 2N5749 Seal for all applications of the above engines. A change has been made to the 8S4190 Seal to furnish 2N5749 Seal for parts service. The 8S4190 Seal is no longer be available.

Adaptable To: The new 2N5749 Seal directly replaces the former 8S4190 Seal in the above engines for all applications.

Caterpillar Information System:

1987/05/18 Be Sure Tubing Clamps That Fasten Air-To-Air Aftercooler To Air Lines Are Correctly Installed{1058}

1987/05/18 Hollow Dowel Relieves Accessory Drive Oil Leakage{1207,1166}

1987/05/18 New Plastic Water Sleeve Used{1380}

1987/05/18 Twist Drills Available{0670,0600}

1987/05/18 Check Alternator Output Connection Prior To Machine Delivery{1405}

1987/05/18 New Undercarriage Reconditioning Bulletin Available - Reusability Guidelines And Installation Procedures For Split Master Links{4176}

1987/05/11 Enhancements Available For Marine PAR Program {1000}

1987/05/11 Classifications For Marine Engine Ratings {1000}

1987/05/11 Two New Self-Powered Digital Tachometers And Signal Generator Available {7462}

1987/05/11 Horizontally Mounted Jacket Water Heater Now Used {1383}

1987/05/11 Maintaining Coolant Water Temperature Contactor Accuracy {7453}

1987/05/11 The Caterpillar Fuel Flow Monitor System Available {0782,1000,1250}

1987/05/18 Improved Oil Temperature Regulator Gasket{1330}

1987/05/25 1U5796 Pressure Differential Gauge Group Available For Load Sensing Hydraulic Systems and Differential Steering System{0770,0784,5050}

1987/05/25 New Service Tools Available{0600}

1987/05/25 Improved Start Switch Used{1416}

1987/05/25 Remanufactured Heavy-Duty Starters And High-Amp Alternators{1405,1453}

1987/05/25 Truck Performance Diagnostic Guide Available{0374,1219,1227}

1987/06/01 Use Only Paint To Mark Connecting Rod Caps For Torque-Turn Method {1218,1219}

1987/06/01 Use Correct Pistons And Rings For 3406B Truck Engines {1214,1215}

1987/06/01 Remanufactured Programmable Electronic Engine Controls (PEEC) {1250}

1987/06/01 Fuel Injector Trim Bolt {1257}

1987/06/01 Features And Servicing Of The Various Caterpillar 3161 Governors {1264,1278}

1987/06/01 Exhaust Manifold Thermocouple Has Longer Insulated Leads {1050,1408}