1988/04/04 Caterpillar

Fuel Ratio Control Diaphragms And Settings On 3161 Governors{1278}

Usage:

3600 Family of Engines

The diaphragms in the 7C4433 Fuel Ratio Control on the 3600 Family of Engines are serviced. The illustration shows the locations of the lower 2W122 Diaphragm and the upper 2W121 Diaphragm.

Location of parts.

When replacing the diaphragms, be sure that a 7C4000 Screw Assembly is installed in the fuel ratio control group. This assembly has a steel screw and an aluminum piston that will improve diaphragm life, especially in high vibration applications. Also, be sure the 5H6005 Seal is installed on the 7C4000 Screw Assembly. This seal, together with the aluminum piston, reduces the sideways motion and fretting of the diaphragm. Always reset the arming pressure and level setting after replacing the diaphragms.

NOTE: A special level setting may be required for satisfactory performance in some high altitude applications and in some applications where a cubic demand can be on the engine, such as a marine application.

Caterpillar Information System:

1988/04/04 Stepped Compression Ring Temporarily Used{1214,1215}

1988/04/04 Use Improved Heat Start Switch{1416}

1988/04/04 Method To Reduce Indicator Contact Point Breakage{0760}

1988/04/04 Sealed Beam Halogen Lamps Are Available{7309}

1988/03/28 Polarity Corrections On Wiring Diagrams{4450}

1988/03/28 New 1U6602 Tachometer Group Available{0775,0781}

1988/03/21 New Power Pad Housings With Needle Bearings Used In Fuel Injection Control Groups{1264}

1988/03/21 New Publication Available-"Diesel Fuels And Your Engine"{0374,0375,0645}

1988/03/21 Service Tools For Reintjes Marine Gears{0723}

1988/03/14 New Connecting Rod Assembly Used{1218}

1988/03/14 New Auxiliary Water Pump Group Used{1371}

1988/03/14 Use The Correct Oil In Spark-Ignited Engines{1300}

1988/04/18 Extraction Tools For "Live Oil Sampling"{7770,0770,0781,0783,0784}

1988/04/18 Some Components Of The Variable Pulley And Adjustable Pulley On The Kent-Moore Fuel Injection Test Bench Are Available From Caterpillar{0782}

1988/04/18 1" 8T9141 Offset Sledging Wrench Available{0602}

1988/04/18 How To Identify Failures To Electric Jacket Water Heaters{1383}

1988/04/18 Former Exhaust Valve Bridge For Jacobs Brake® Interferes With 40 mm Nozzle Adapter; New Bridge Used{1119,1100}

1988/04/18 Modification To Prevent Oil Leaks Around Governor Control Shaft{1265,1287}

1988/04/25 New 1U8115 Generator Test Lead Set With Insulated Tips {0785}

1988/04/25 New Diaphragm For Brakesaver Control Valve {1159,1155}

1988/04/25 New Socket In Valve Rocker Arms Provides Lubrication For Inlet Valve Seats {1103,1105,1123}

1988/04/25 Improved RH Watercooled Exhaust Manifold And Exhaust System Sealing {1059,1070,1061,1050}

1988/05/02 Diode Added To Prevent Damage To Time Delay Relay {7421}

1988/05/09 Improved Seals Used; Seal Replacement In Folded Core Radiators {1353}