1987/07/06 Caterpillar

Silicone Rubber Water Seals Available{1100}

Usage:

3400 Family Of Engines

Reference: Service Magazine, December 15, 1986, Page 10, "Avoid Oil Contact With New Water Passage Seals Used In Cylinder Head Groups".

The 3400 Family of Engines use Ethylene Propylene Diene Modified (EPDM) rubber water seals on all new engines. These 4W1055 Water Seals resist taking a permanent set when they are exposed to steam in the cooling system. But, these seals cannot be used where they can come in contact with fuel or oil. The EPDM rubber seals will soften and swell if they come in contact with fuel or oil or cooling system lubricants. A new silicone rubber 7C9912 Water Seal is now available for parts service. The silicone rubber water seal can be used if the seal will come in contact with fuel or oil during a rebuild. Care should still be taken to keep the cooling system free of oil, fuel or lubricants to ensure the life of the EPDM liner O-ring seals.

Caterpillar Information System:

1987/07/06 New Cylinder Head And Spacer Plate Gaskets Prevent Oil Leakage Around Gear Pocket{1101}

1987/07/06 Testing Connecting Rod Eye Bushings When Overhauling Engines{1218}

1987/06/29 Check For Shipping Plugs On The Inside Of New Pistons{1214}

1987/06/29 New Water Pump Group Used{1361}

1987/06/29 Recommendations For Reusability Of Pistons With Crater Rim Cracks{1214}

1987/06/15 Use Of Crankshaft Seal Adapter Eliminated {1150,1160,1161}

1987/06/15 All Three Main Bearing Part Numbers Stamped On Lower Portion Of Standard Size Bearing {1203}

1987/06/15 New Relief Valve Guide Used In Oil Pump Groups {1304}

1987/06/15 New 1U5230 Hand Pump (General Purpose Hydraulic) Available {0646}

1987/06/15 New 1U5752 Retainer Tool Available To Service Hydrostatic Transmissions {0721}

1987/06/15 1U5495 Latch Group Available For Earlier Large Duo-Cone Seal Installers {0700,4052}

1987/06/15 New Face Films For Electronic Monitoring System (EMS) Panels {7490}

1987/07/06 High Alloy Cylinder Head Improved{1101}

1987/07/06 3400 Engine Major Component Performance Guide Available{0374}

1987/07/06 New Power Takeoff Groups Used; New System Gives Better Face And Bore Runout On Front Power Takeoff Adapters{3050,3107}

1987/07/06 New Sealant Used On Oil Pan Mounting Bolts{1201,1302}

1987/07/06 New 1U5524 Adapter Cable Available For Use With 6V9060 Spark Timing Adapter Group And 8T5300 Engine Timing Indicator Group{0779,0781}

1987/07/06 New Electronic Modular Control Panel (SR-4 Generator Mounted){4450,7002}

1987/07/13 New Engines Rated @ 160 kW (210 hp) @ 2600 rpm Must Be Rerated When Used To Replace 2800 rpm Engines{0374}

1987/07/20 New Cylinder Liner Available {1216}

1987/07/20 Additional Guidelines For Using The 8T2700 Blowby/Air Flow Indicator Group {0781,1200,1350}

1987/07/20 Remanufactured Electronic Modular Control Panel Modules (EMCP) For Package Generator Sets {7002}

1987/07/20 Gas Regulator Setting Tool Group Available {0782}

1987/07/27 Box Labels Available For Pleasure Craft Cruise Kits{1000}