1985/09/02 Caterpillar

New Precombustion Chamber Seal Available{1106,1100}

Usage:

All D346, D348, D349 Engines

SUPPLEMENT: 05/18/87

SERVICE MAGAZINE, SEPTEMBER 2, 1985, PAGE 6, "New Precombustion Chamber Seal Available". Put a mark through this article and refer to the article with the same title in this issue.

--------------- END SUPPLEMENT ---------------

Description of Change: A new seal is available for use on the precombustion chambers in the above engines. The former seal could allow coolant leakage into the lubrication oil system in some high heat applications. The new seal is made from a different material that resists high temperatures better. The new seal will give improved service life in high temperature applications.

Adaptable As: The new 2N5749 Seal can be used as a direct replacement for the former 8S4190 Seal in the above engines.

Location of new 2N5749 Seal.

Caterpillar Information System:

1985/09/02 New Engine Pressure Group Available{0600,0770,0781}

1985/09/02 Adjusting Pneumatic Speed Control For Correct Operation{1264}

1985/09/02 Repair Kits Available For Air Actuator Used In Governor Control Groups{1250}

1985/08/26 Dual Element Air Cleaner Group Available{1054,1051}

1985/08/26 Improved Front Gear Housing Assembly Used In Engine Front Housing Group{1151}

1985/08/19 New Camshaft Installation Tools Available{0600}

1985/08/19 New Address And Phone Number For Ordering Fabricated Tool (FT) Drawings{0600}

1985/08/19 Improvements Made To Spark Ignited Engines{1100,1104,1105,1207}

1985/08/19 New Format For Some Special Instructions{0300}

1985/08/12 Thread Lock Now Used On Timing Advance Bolts{1272}

1985/08/12 The 8T3115 Portable Track Lubricator Can Be Used To Drain And Fill Track Link Joints{0645,4169,4170}

1985/08/12 Halogen Head And Flood Lamps Are Now Available{7309}

1985/09/02 Use Correct Valves When Rebuilding Engines{1105,1103}

1985/09/02 Check Fuel Injection Nozzles In Overheated Engines{1254}

1985/09/02 Steel Fuel Pump Lifter Used{1250,1251}

1985/09/02 Fumes Disposal Group Improved{1317}

1985/09/16 Oil Pump Groups Improved {1304}

1985/09/16 New Tools Available To Change BrakeSaver Control Valve Diaphragm {0600,1155}

1985/09/16 Changes To Fuel Systems {1250,1251,1252,1253,1254,1100}

1985/09/16 Pressure Switch Has Been Improved {1419,7332}

1985/09/16 Use Product Information System For Consists Of Engines With No Bills Of Material {0330,0350,0373,1000}

1985/09/16 Keep Product Information System Up-To-Date {0330,0350,0373}

1985/09/16 Engine Valve Lash And Fuel Injection Timing Adjustment Procedure {1100,1251}

1985/09/16 New O-ring Seals And Additional Clamps Used In Instrument Panel Fuel Filter Differential Lines Group {1250}