1987/04/06 Caterpillar

Longer Bolts With Spacers Now Used On Exhaust Manifolds{1059}

Usage:

3516 Vehicular Engines ( 28Z)

SUPPLEMENT: 05/25/87

SERVICE MAGAZINE; APRIL 6, 1987; PAGE 13; "Longer Bolts With Spacers Now Used On Exhaust Manifolds." Put a mark through the 7N8106 in the New Part No. column in the chart and change it to read 7W8106.

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

Description of Change: Longer bolts with spacers are now used to retain the exhaust manifold to the cylinder head on the above engines. The longer bolts stretch more when installed and are, therefore, less likely to loosen than the former bolts. The new manifolds have spotfaced flanges to provide a mating surface for the new spacers.

Adaptable To: This improvement is in effect with 3516 Vehicular Engine 28Z618. The torque specification on the new 9L7373 High Temp Bolts is 55 ± 7 N·m (40 ± 5 lb ft). The new bolts, spacers and manifolds are in effect as shown in the following chart and are direct replacements for the former parts when used together. The former manifolds can be used with the longer bolts and spacers by adding a 21.0 mm (.82") diameter spotface to all bolt holes.

Caterpillar Information System:

1987/04/06 New Idler Shaft And Sealing Washers Used In Front Gears And Accessory Drives{1206,1207}

1987/04/06 Rerate Plates And 4W5140 Engine Information Plate Available For Use When Rerating 3406B (PEEC) Truck Engines{0782,1250}

1987/04/06 Engine Identification Plate Information For 3406B (PEEC) Truck Engines{0782,1250}

1987/04/06 Improved Governor Performance{1264,1250}

1987/04/06 Stop Engine If There Is A Turbocharger Bearing Failure{1052,1318}

1987/03/30 Oversize Piston Ring Seal Available For Clutch Group {3302,3300}

1987/03/30 Salvage Of Cylinder Heads By Using Oversized Valve Guides And Valve Inserts {1104,1103}

1987/03/30 New Washer Used In Fuel Transfer Pump Group {1256}

1987/03/30 Oversize Bearings For Turbocharger Center Housings Available {1053,1052}

1987/03/30 Piston Cooling Jets No Longer Used In Some Applications {1200}

1987/03/30 New Service Tools Available {0600}

1987/03/23 New Clamps And Grommets For Turbocharger Oil Lines{1300,1307,1052}

1987/04/13 Checking Injector Synchronization On Engines Equipped With New 11.0 mm Injectors{1290}

1987/04/13 Initial Start Of Engine Using An EGB29P Governor/Actuator After Filling With Oil{1264}

1987/04/20 New Pipe Used Between Turbocharger And Aftercooler; Improved Turbocharger Compressor Housing Has Two Retaining Bolt Holes{1050,1061,1079}

1987/04/20 Serviceable Parts For New Fuel Ratio Control; Pressurize Control To Set Rack On 3406B Engines In Driltech Drill Rigs{1257,1258,1264}

1987/04/20 Material Changed In Exhaust and Inlet Valves{1105}

1987/04/20 Fuel Injection Timing Adjustment{1250}

1987/04/20 Improved Fuel Priming Pump Used{1258}

1987/04/20 Use Improved Heat Start Switch{1416}

1987/04/20 Moisture Cover Available For Start Switches{1416,1424}

1987/04/20 Microfiche Library Cross References Caterpillar Part Numbers With Expanded Product Line Part Numbers{7567}

1987/04/20 New Service Tools Available{0600}

1987/05/04 Products Equipped With Diagnostic Connectors Require Less Time For Electrical Troubleshooting{1400}