Improved Cylinder Head Gasket Now Used{1101,1201}
Usage:
D8K Tractors;
583K Pipelayers;
G342 Natural Gas Engines
Description of Change: A new cylinder head gasket is used on the above models. The new gasket has a fire ring made of a larger diameter wire to give a better seal against combustion gases.
Adaptable As: The new 8N4810 Gasket is a direct replacement for the former 7N3642 Gasket which has been canceled. Two gaskets are needed per engine.
INSTALLATION: When the new 8N4810 Gasket is installed, tighten the 5/8" (15.9 mm) diameter cylinder head bolts to a torque of 200 lb ft (270 N·m). Formerly, these 5/8" (15.9 mm) bolts were tightened to a torque of 150 lb ft (205 N·m). Be sure to use the correct procedure and sequence shown in the Service Manual to tighten the cylinder head bolts.
Caterpillar Information System:
1978/12/11 New Electric Service Meter Used{7480}
1978/12/11 New Piston Groups Use Keystone-Type Piston Rings And Have Improved Design Of Valve Pockets{1214,1215}
1978/12/04 90° Elbow Added To Air Cleaner Group To Prevent Damage To The Air Filter Service Indicator{1051,7452}
1978/12/04 New Exhaust Valve Has Improved Three-Piece Construction{1105}
1978/12/04 New Design Brace Used In 4N2905 Air Cleaner Group{1051}
1978/12/04 Some Force Is Needed To Turn The Drive Shaft In All Tyrone Gear-Type Pumps; New Torque Value For Body Bolts Of Tyrone Gear-Type Pumps{5073}
1978/12/04 Stronger Fan Adjustment Bracket Used In Fan Drive Group{1358,1359}
1978/11/27 New Coolant Temperature Regulator Has Flat Washer-Type By-Pass Valve{1355}
1978/11/27 New Hose Has More Resistance To Heat{1074}
1978/11/20 A Washer With Closer Tolerances Is Now Used In The Governor And Fuel Pump Drive Group{1288,7462}
1978/11/20 Sender Unit For Engine Oil Pressure Gauge Moved To New Location On Truck Cab{7455}
1978/11/20 Single Coil Shut-Off Solenoid Used In Place Of Dual (Two) Coil Shut-Off Solenoid{1259}
1978/12/18 New Switch Assembly Used With Exhaust Gas Recirculation System{1080}
1978/12/18 Longer Bolts Are Now Used To Fasten The Engine Fan Assembly To The Adapter{1356}
1978/12/18 The FT530 Puller Now Can Do The Work Of Three Pullers{0621}
1978/12/18 Caution: Do Not Change Orifice In Water Outlet Of Auxiliary Pump Group{1371}
1988/01/04 Be Sure To Follow Correct Procedure When Checking Transmission Primary Clutch Pressures With Transmission Installed In Machine{3150}
1988/01/04 Part Numbers For Bulk Lengths Of Decal Stripes{7557}
1988/01/04 New FT2253 Cable Assembly Drawing Available For Kent-Moore Fuel Injection Test Bench{0782}
1988/01/04 Die Cast Flywheel Housing Has Less Weight{1157}
1988/01/25 New Undercarriage Reconditioning Bulletin-Sealed And Lubricated Track Servicing Procedure For Non-Restrained Track {4150,0374}
1988/01/25 New Microfiche Shows Part Numbers And Locations Of Decals And Stripes {0374,7557}
1988/01/25 New Bearings Available For Reverse Idler Gear {3300}
1988/01/25 8T5314 Socket Adapter Available To Correctly Install Alternator Pulley Nut {0601}