1991/05/20 Caterpillar

Procedure To Retain Oil Pump When Pump Mounting Pad On Cylinder Block Is Broken{1201,1304}

Usage:

3406B Engines

When objects become caught between the oil pump drive gears, the oil pump mounting pad on the cylinder block can break. In many cases this method of retaining the oil pump housing can be used instead of replacing the cylinder block. This method can be used only if 40% or more of the oil pump mounting pad can be supported on the broken cylinder block mounting pad.

1. Fabricate a support block (A) from 12.7 mm (.50 in) thick mild steel as shown in illustration 1.

Illustration 1. Dimensions for support block (A).

2. Fabricate a tapped block (B) from 12.7 mm (.50 in) thick mild steel as shown in illustration 2.

Illustration 2. Dimensions for tapped block (B).

3. Drill a 10.5 mm (.41 in) diameter hole through the oil pump mounting pad on the cylinder block as shown in Illustration 3.

Illustration 3. Location to drill clearance hole in remaining oil pump mounting pad on cylinder block.

4. Install oil pump (4) as shown in Illustration 4. Two 0L1352 Bolts (1), three 5M2894 Washers (2), and one 0L1143 Bolt (3) are required to install the pump.

Illustration 4. Location of oil pump mounting components.

Caterpillar Information System:

1991/05/20 Cylinder Kits Not Recommended For Use In 3400 Family of Marine Engines And D8N Tractors{1214}

1991/05/20 Do Not Weld Repair Worn Wheel Spindles For Off-Highway Trucks Or Wheel Tractor-Scrapers{4002,4205,4234}

1991/05/13 Unwanted Engine Shutdown Caused By "01" And/Or "04" Diagnostic; New "09" Diagnostic Available With 8T9881-8 Electronic Control Module (ECM){4490}

1991/05/13 Engine Updates Help Prevent Piston Seizures{1214,1252,1265,1274,1355,1383,1393,1456}

1991/05/13 Rear Gear (Cam Drive) Groups Improved{1206,1201,1212,7551,7552,7553}

1991/05/13 New Specification For Exhaust Valve Clearance{1123,1121,1105}

1991/05/13 Replacing A 3176...(2YG) Truck Engine With A 1991 3176...(7LG) Truck Engine{1000,1119,1408,1901}

1991/05/13 Component Changes For 1991 Model 3176 (7LGH, 43Z) Engines{1052,1087,1119,1215,1290,1292,1304,1361,1362,1378,1408,1901,1902,1912}

1991/05/13 Larger O-ring Seal Available For Oil Supply Port In Governor Housing{1264}

1991/05/06 New Altronics Interface Boxes{1552,1566}

1991/05/06 Spacers And Longer Bolts Used For Air Inlet Adapters (Plenum Covers) To Prevent Bolt Loosening And Leaks{1058}

1991/05/06 New Bracket And Support Assemblies Help Prevent Cracks In Air Cleaner Housings{1051}

1991/05/20 Replace Camshaft And Install New Lifters If Pitting, Spalling, Or Wear Occurs On Lobes Of 4N0599 And 4N0602 Camshafts In Fuel Injection Pump Groups{1251,1253}

1991/05/20 Two Scavenge Screens Now Used In Scavenge Oil Pumps{1312}

1991/05/20 New Speed Setting Clutch Group For 3161 Woodward Governors{1265}

1991/05/20 Correct Testing of Sensing Switches{7400,7402,7422}

1991/05/27 Expected Future Air Conditioning Service Requirements{7320,1802}

1991/05/27 Technical Marketing Information (TMI) System for Commercial Engine Products{0337,0334,0336}

1991/05/27 Smaller Connecting Rod Bolt Used In 4W6425 Air Compressor; Use Correct Torque{1803}

1991/05/27 New Fuel Manifolds And Clamps Reduce Vibration Of Fuel Lines{1252,1702}

1991/06/03 New Deutsch HD-10® Electrical Connectors Used{1400,1408}

1991/06/03 Reference Emissions Graph Helps Determine Oxides Of Nitrogen{1050}

1991/06/03 New Oil Drain Assembly Used; Be Sure To Correctly Tighten Drain Plugs, Port Plugs, And Pipe Plugs In Oil Pans{1302}

1991/06/10 New Timing Specifications For 3500 Spark-Ignited Engines{1552}