Improved Coolant Seal For Connection Between Cylinder Heads{1100,1350}
Usage:
D349 Industrial, Marine and Off-Highway Truck Engines
Description of Change: The method to seal the junction between the cylinder heads on the above engines has been improved. O-ring seals and a collar are used with the existing clamp to prevent coolant leakage. Formerly, leakage of coolant was possible as the engine became cool and compression of the seals decreased.
Adaptable As: Direct replacement as shown in the chart:
INSTALLATION: A different torque is now used to tighten the 9S8981 Clamp. When the new parts are installed, tighten the 9S8981 Clamp to 40 ± 5 lb in (4.5 ± 0.6 N·m).
Caterpillar Information System:
1977/08/22 Tools Now Available To Ream And/Or Hone 0.500" (12.70 mm) Diameter Valve Guides{0663}
1977/08/22 New Main And Connecting Rod Bearings Are Made Of Higher Strength Material{1230}
1977/08/15 Tools From Caterpillar To Test And Charge Air Conditioners And For Repair Of Frigidaire Compressors{7320,0651}
1977/08/08 Clean Bolt Holes In Cylinder Block Before Cylinder Heads Are Installed{1101,1201}
1977/08/08 New Air Inlet Manifold Has Longer Bolt Bosses With More Thread Depth To Keep Bolts Tight{1058}
1977/08/08 Spacers Added To Alternator Group To Improve The Mounting{1405}
1977/08/08 Larger Boss Used In Cylinder Block So Bolt Hole Will Not Be Drilled Into Coolant Passage{1201,1350}
1977/08/08 New Vickers Pump Design{5055}
1977/08/08 Correct Adjustment Of Fuel Shut-Off Solenoid Shaft Can Prevent Failures{1259}
1977/07/11 New Inserts To Repair Cylinder Liner Seats On D353 Engine Blocks{1201,1216,1217,0663,0653}
1977/07/11 Heat Absorbing Material Aids And Protects Surface Areas Being Welded Or Heated{0680}
1977/07/11 New Component Code List For Use In The Service Information Retrieval System{0331,0374}
1977/08/22 Be Sure To Drain Oil In BrakeSaver At Every Lubricating Oil Change Period{1155,1300}
1977/08/22 Problems With Oil Or Fuel Filters{1261,1318}
1977/08/22 Installation Of Generator Sets On Rigid Bases{4450}
1977/08/29 New Clutch Groups Used In Front Power Take-Offs; Service Kits Available{3055}
1977/08/29 Improved Cylinder Block With Spacer Plates Used With Improved Cylinder Heads And Cylinder Head Gaskets{1101,1201,1221}
1977/08/29 New Tube Assemblies For Turbocharger Oil Lines; New Base Assemblies For Oil Filters{1052,1306,1307}
1977/08/29 Engine Valve Springs Are Now Made Of Stronger Steel{1108}
1977/08/29 Anti-Corrosion And Break-In Coatings{0374,3256}
1977/08/29 More Bolts Hold Flywheel Housing Group{1157,1162}
1977/09/05 Installation Procedure For Crankshaft Wear Sleeves Changed{1202,1160,1161}
1977/09/05 Check For Extra Holes In Crankshaft Flange If Oil Leaks From Between The Flywheel And Crankshaft Flange{1156,1202}
1977/09/05 Field Repair Of Cooler Cores Made Of Aluminium{1063,1374,1375}