1978/04/03 Caterpillar

A Gasket Group Is Available To Give Improved Sealing For The Oil Supply To The Rocker Arms On Early Engines{1101,1102,1221}

Usage:

3408 Engines (67U106-224, 99U539-583, 28V257-436, 48W417-948)

Description of Change: The above engines use the cylinder head bolts as an oil supply passage for lubrication of the rocker shafts. To keep lubricating oil out of the cooling system, a 7N9013 Gasket Group is available to give a better seal to the lubricating oil passage between the cylinder block and the cylinder head.

The new gasket group has steel sleeve seals which are Teflon coated. These seals are used in the bolt holes in the spacer plate. The seals extend through both the spacer plate gasket and the head gasket to give a positive seal between the cylinder block and head.

To install the new gasket group, four holes in the original spacer plate must be made larger or you can use a new spacer plate which has the larger holes.

Adaptable To: The new parts, used together, will fit all 3408 Engines which use the head bolt holes for oil supply to the rocker shaft. Identification of these engines can also be made by the part number 4N351 on each cylinder head.

Caterpillar Information System:

1978/04/03 Procedure For Alignment Of Transmission Mounting Parts On 1100 Series And 3208 Truck Engines With Allison MT640, MT650, And AT540 Series Transmissions{3000,1156,1157}

1978/03/27 Correct Adjustment Of The Governor Control Linkage In Truck Engines Is Necessary To Prevent Low Power{1265,1269}

1978/03/27 More Torque Now Used To Tighten The Retainer Nut For Turbocharger Compressor{1052,1053}

1978/03/27 5P4149 Conversion Group To Become A Discontinued Item On October 1, 1978{0650,1254}

1978/03/27 How To Find Correct Oil Change Intervals For Truck Engines Operated In Short Distance Applications (Pick Up And Delivery Service){1318,7500,0374}

1978/03/27 9N3700 Or 9N3299 Nozzle Assemblies Must Be Used On 3208 Engines That Are Equipped With Exhaust Gas Recirculation (EGR){1254}

1978/03/27 Improved Thrust Washers Now Used With Planet Gears{3000,3072,3106,3110,3003,3001,3100,3116,3159,3176,3107,5150,5165}

1978/03/27 5P8675 Extension Handle Available For General Uses{0614}

1978/03/27 Use 5P8706 Die Repair Kit For The Repair Of 9S6331 Die Assembly{0623}

1978/03/20 "Danger Do Not Operate" Tags Now Available{0374}

1978/03/13 The Causes And Reduction Of White Exhaust Smoke During Cold Engine Starts; Maintenance Aids Available To Decrease This Problem{1250,1383,1050}

1978/03/13 Soft Washers And Lockwashers Are Now Used With The Mounting Bolts For Air-Fuel Ratio Control{1278,1264}

1978/04/10 New Piston Group With Better Service And Operation Characteristics Now Available{1214}

1978/04/10 New 5P9693 Reusable Cable Tie For Storage Of Wires, Cables And Tubing{0630}

1978/04/10 New Lifting Eye Group Used On 3412 Industrial Engines Equipped With Turbochargers{1101,1000}

1978/04/17 Improved Yokes, Hardened Washers And More Torque Keep Valve Lifter Guides Tight {1209}

1978/04/17 Locating Bushings For The 5P3550 Rod Boring Machine Will Now Hold Tapered Piston Pin Bushings {0626}

1978/04/17 Improved Oil Suction Tube Assembly {3300,3302}

1978/04/24 Use 6V100 Tool Arrangement To Remove And Install Piston Pin Bearings For Both Tapered And Standard Connecting Rods{0620,1218}

1978/04/24 Do Not Use The 5B1401 Cleaning Tool Group To Clean The Orifice In Capsule-Type Fuel Injection Nozzles{0650,1254}

1978/04/24 Oil Grooves And Harder Gears Are Now Used In The Oil Pumps On 6.25" Bore Vee Engines{1304}

1978/04/24 Cylinder Block Has New Cover With An Oil Return Connection For Rockford Fan Drive{1201}

1978/04/24 Improved Water Separator Element And Retaining Clamp Stops Fuel Leakage{1250}

1978/04/24 New Oil Pressure Gauge Available For Marine Transmissions Used On D348, D349, D353, D379, D398, D399, 3406 And 3408 Marine Engines{7457,3300}