1979/08/13 Caterpillar

New Cylinder Head Gasket Has Smaller Diameter Cylinder Openings To Improve Location Of Combustion Seal Ring{1101,1201}

Usage:

D9 Tractors ( 18A, 19A, 34A, 66A, 49A, 50A, 90V, 97V, 98V, 99V, 12U );
594 Pipelayers ( 62H, 96V );
G353 Engines ( 64B );
D353 Engines ( 46B, 47B, 77B)

Description of Change: A new cylinder head gasket is used on the above models. The new gasket has cylinder openings which are .106" (2.69 mm) smaller in diameter than the openings in the former gasket. This changes the location of the combustion seal ring in relation to the cylinder liner flange, so the ring will have positive support. Formerly, the seal ring was in a location near the edge of the liner flange and, with normal tolerances, it was possible for the ring to be in a position beyond the edge of the liner flange. In this position, the ring does not have good support and will become damaged during operation.

Adaptable As: The new 8N7264 Gasket is a direct replacement for the former 7N3083 Gasket, which is canceled. Two are used per engine.

Caterpillar Information System:

1979/08/13 New 35-Ampere Alternator Used On Some Engines In Caterpillar Equipment{1405,1406}

1979/08/13 6V14 Hydraulic Cylinder Group Now Available{0621}

1979/08/13 5P936 Liner Seat Insert Available For 6.25 Bore Engine Blocks With Counterbores{1217}

1979/08/13 New Seal Used Under Retaining Bushing For Fuel Injection Pump Bonnet{1251,1253,1286}

1979/08/13 Splash Shields Added To Caterpillar Fuel Injection Test Bench{0652}

1979/08/06 Changes Made To 8S2243 And 8S4613 Wrenches Used On Fuel Injection Pumps{0612,1251}

1979/08/06 Front Accessory Drive Group Changed; New Drive Parts For Fuel Transfer Pump{1256,1206}

1979/08/06 When Timing The Engine, Be Sure The Timing Bolt Is Installed In The Correct Hole In The Flywheel{1156,1251,1281}

1979/08/06 Use Correct Installation Procedure For Clutch Pilot Bearing In Rear Power Takeoff{3055}

1979/08/06 New Tools Are Available For Gasket Removal And Surface Reconditioning{0670}

1979/07/09 New Cylinder Liner Has Improved Design To Keep Liner Temperatures Lower{1216}

1979/07/09 New Shaft Assembly Used In Governor Group And New Coupling Assembly Used In Drive Group For Governor And Fuel Injection Pump{1264,1288}

1979/08/13 Sealant Now Used On Pipe Plugs At The Bottom Of The Oil Filter Base Assembly To Prevent Oil Leakage{1306}

1979/08/20 Flex Plate Kits Are Now Available For Vickers Vane-Type Hydraulic Pumps{5055}

1979/08/20 Turbocharger Bearings Are Now Available In More Different Sizes For Better Turbocharger Reconditioning{1053}

1979/08/20 New Rear Cover And Gasket Used On Water Pump{1361,1350}

1979/08/27 Why Engines Are Damaged By Fuel Sulfur{1104,1216,1280,1318,1215}

1979/08/27 New Governor Housing Assembly Used In Governor And Fuel Injection Pump Group{1253,1264}

1979/08/27 Exhaust Manifold And Air Lines Groups Changed To Prevent Exhaust Leakage{1059,1061}

1979/08/27 Service Kit Is Available For Woodward UG8 Governor{1289}

1979/08/27 6V190 Clamp Is Available For Use On Sleeve Metering Fuel Systems{0626,1250}

1979/08/27 Engine Oil Viscosity Changed To SAE 10W/30 For Shipment From All U. S. Factories{1318}

1979/08/27 New Rocker Arms And Rocker Arm Shaft Have Improved Lubrication{1102}

1979/08/27 New Design Thrust Plate Used In Crankshaft Group{1201,1202,1203}