1982/09/27 Caterpillar

Improvement To Engine Overspeed Alarm System{7410,7418}

Usage:

3508 and 3512 Generator Set And Marine Engines

Description of Change: A diode has been added to the overspeed alarm system on the above engines that are equipped with the overspeed alarm and the electric shutoff. There have been reports that the remote overspeed light and LED on the speed switch showed an indication of an overspeed condition after the engine had been stopped normally. The diode corrects this condition. The diode is connected to the resistor, that has the red and white wire, in the overspeed system junction box. See the illustration.

Adaptable To: The new 2W4899 Diode is adaptable to all 3508 and 3512 Generator Set and Marine Engines equipped with the electric shutoff and overspeed controls.

Location of new 2W4899 Diode.

Caterpillar Information System:

1982/09/27 New Thrust Discs Used In Planetary Groups, Winch Groups{3187,5165,3176}

1982/09/27 New Head Gasket Improves Seal Between Block And Liner Flange{1101,1201}

1982/09/27 New Oil Additives Can Cause High Copper (Cu) Indications During S.O.S. Tests{0372,1318}

1982/09/27 Metal Particles On Magnetic Pick-Up Can Permit Engine RPM To Vary; Move Pick-Up To A New Location{1289}

1982/09/27 Do Not Use A Wire Brush On Fuel Nozzles{1254}

1982/09/20 New Sleeve Used In BrakeSaver To Decrease Oil Pressure In Lip Seal Area{1155}

1982/09/20 Induction Bearing Heater Available{0627}

1982/09/20 Dial Bore Gauge And Size Setting Fixture Available{0653}

1982/09/20 Filler Cap Locks Prevent Vandalism (Damage) To Fluid Compartments{1273,1316,1382,3177,5056}

1982/09/20 New Recommendations For Track Roller Wear Before Rebuilding{4180,0662}

1982/09/20 Improved Lubrication System{3311}

1982/09/20 New Meter Can Be Used To Check Wire Feed Rates During Weld Operations Of Undercarriage Components{0653}

1982/09/27 Electrical System Voltage Must Be Limited To A Maximum Of 40 Volts With Woodward Model 2301 Governors{1289}

1982/10/04 Changes To Direct Inquiry SIRS{0374}

1982/10/04 Service Management Guide And Service Methods And Equipment Guide Canceled{0374}

1982/10/04 Planned Engine Repairs{0374,0375,1318,0372}

1982/10/04 New Tool Makes Installation Of Carbon Stop Seals Easier{0622,1254}

1982/10/04 Improvements Made To Marine Transmissions{3300}

1982/10/04 New Connecting Rod And Main Bearings Have Thicker Layer Of Surface Material{1230,1203,1219}

1982/10/04 New Fuel Nozzle Test Sheet Available{0651,1254}

1982/10/11 Service Information For Easier Use Of The 6V3100 Timing Indicator Group{0651,1250,1156,1157}

1982/10/11 Indications From 6V3100 Timing Indicator Group Must Be Corrected For Some Applications{0651,1250,1156,1157}

1982/10/11 Field Conversion Procedure For EPA Certified On-Highway Truck And On-Highway Vehicle Engines{0374,0375,7557,1250}

1982/10/11 Bulged Capsule-Type Fuel Nozzles{1254}