1986/08/18 Caterpillar

Silicone Water Seal Available{1101}

Usage:

All D348 Engines

SUPPLEMENT: 12/15/86

SERVICE MAGAZINE, AUGUST 18, 1986, PAGE 4, "Silicone Water Seal Available". Cross out this article and make reference to the article with the same title in this issue.

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

The 8S4275 Water Seal between the cylinder block and cylinder head in D348 Engines was replaced by 2W3797 Water Seal. This change was effective with 57K1328, and 98S2870. The 8S4275 Water Seal has now been reinstated and is available for service in place of the 2W3797 Water Seal.

The 2W3797 Water Seal is made of an EPDM (Ethylene Propylene Diene Modified) rubber seal with a nylon insert. When it comes in contact with oil, the EPDM material may swell and deteriorate over a period of time. This can cause coolant leaks. The 8S4275 Water Seal is made out of silicone and is highly resistant to oil. It also has a brass insert.

Caterpillar Information System:

1986/08/18 Avoid Oil Contact With New Water Passage Seals Used In Cylinder Head Groups{1100}

1986/08/18 Inspection And Replacement Of Fluid Conductors{1274,1307,5057,7554}

1986/08/04 New Pressure Gauges (With Tonnage Scales) Available For Caterpillar Service Tool Manual And Electric Hydraulic Pumps {0770,0615,0616}

1986/07/28 Water Vent Line Improved To Withstand Engine Vibrations {1070,1380}

1986/07/28 Extended Oil And Oil Filter Change Intervals {1300,1318}

1986/07/28 Oil Cooler Gasket Has Improved Material {1300,1378}

1986/07/28 SIMS Reports Must Be Correctly Completed To Be Entered In Data System {0331,0336}

1986/07/28 Less Expensive 12-Volt Converter Available For Radios {1400,1401}

1986/07/28 Material Safety Data Sheets For Parts Sold By Caterpillar That Contain Hazardous Chemicals {0353,0680}

1986/07/28 Change Wiring To Prevent Low Oil Pressure Shutdown Immediately After Start-Up {4450}

1986/07/14 Use Care When Cleaning Clutch Discs{3155}

1986/07/07 Improved 8T3216 Anvil Assembly, Part Of Track Shop Press Tooling {0729,0700}

1986/09/01 Bearing Information For SR4 Generators{4471}

1986/09/01 New Material Used For Disc In Valve Assemblies Of Fuel Transfer Pump Groups{1256}

1986/09/01 Inspection And Replacement Of Parts In The Portable Track Repair Groups{0729,4171}

1986/09/01 Do Not Strike Pin Ends To Loosen Sealed And Lubricated Track{4175}

1986/09/01 New 9W6370 Electronic Speed Switch Adapter Cable Available For Use With 8T5200 Signal Generator/Counter Group{0600}

1986/09/01 Heavy-Duty Line Of Batteries Available To U.S. Dealers{1400,1401}

1986/09/08 Product Support Literature For Military Machines{7567}

1986/09/08 Indications Of Engine Overspeeding When Only One Cam Lobe/Lifter Has Failed{1000,1100,1200}

1986/09/08 Bearing Failures On Engines Due To Lack Of Lubrication{1230,1219,1203,1202}

1986/09/22 Benefits Of Using The Caterpillar Inc. Product Information System{0330,0350,0373}

1986/09/22 Time Requirement Guides (TRG) Available{0370,0374}

1986/09/22 Windshield Wiper Motor Cross Reference{7305}