Baffle Added To Water Pump Cover To Send Coolant In Bypass Line Directly Into The Water Pump{1361}
Usage:
3406 Engines In Most Applications
Description of Change: A baffle on the cover of the water pump now sends water from the bypass line directly into the water pump. This gives improved heater performance at low idle and/or light load conditions. Formerly, the bypass coolant flow mixed with the coolant from the radiator bottom tank.
Adaptable To: All 3406 Engines except those industrial and marine engine arrangements using the 4N1129 or 4N5467 Expansion Tank Groups.
NOTE: For maximum cooling system performance use a 9N2894 Water Temperature Regulator with the new cover. This regulator has a closer fit at the valve seat to keep coolant leakage past the seat at a minimum.
Caterpillar Information System:
1977/07/11 Some Earlier Vickers Hydraulic Pump Groups Are Not Available For Parts Service--Some Modification Is Needed To Install Replacement Pump Groups{5055}
1977/07/11 Tools To Install Crankshaft Seal And Wear Sleeve{1160,1161,0622}
1977/07/04 New Procedure For Calibration Of 1P3060 Pyrometer Group{0653,1050}
1977/07/04 New Seal For Crankshaft{1161}
1977/07/04 Use New Procedure To Tighten Flywheel Housing Bolts{1157,1201}
1977/07/04 Tools To Hone (Machine) Cylinder Liners Are Available To Permit The Use Of Used Cylinder Liners With New Style Pistons{0664,1214,1216}
1977/06/27 Service Tools For Low Emission Truck Engines With EGR{0650,1059,1080}
1977/06/27 New Aftercooler Housings And Covers Have Improved Design{1063}
1977/06/27 Correct Rebuild Kits Must Be Used For Repair Of Earlier And Later Water Pumps{1361}
1977/06/27 More Of The Oversize (Larger) Cast Iron Seal Rings Are Available For Clutch Housings And Clutch Pistons{3169,3170}
1977/06/20 Socket For Removal And Installation Of Fuel Injection Pump Bushings is Now Stronger{0612,1253}
1977/06/20 5P7333 Tool Group Available For The Repair Of Loose Bridge Dowels On Cylinder Heads{0663,1101}
1977/07/11 New Adjustment Pin And Valve Seal Used In Fuel Ratio Control{1278}
1977/07/11 Safety Vent Caps For Caterpillar Batteries{1401}
1977/07/11 New Component Code List For Use In The Service Information Retrieval System{0331,0374}
1977/07/11 Heat Absorbing Material Aids And Protects Surface Areas Being Welded Or Heated{0680}
1977/07/11 New Inserts To Repair Cylinder Liner Seats On D353 Engine Blocks{1201,1216,1217,0663,0653}
1977/08/08 Correct Adjustment Of Fuel Shut-Off Solenoid Shaft Can Prevent Failures{1259}
1977/08/08 New Vickers Pump Design{5055}
1977/08/08 Larger Boss Used In Cylinder Block So Bolt Hole Will Not Be Drilled Into Coolant Passage{1201,1350}
1977/08/08 Spacers Added To Alternator Group To Improve The Mounting{1405}
1977/08/08 New Air Inlet Manifold Has Longer Bolt Bosses With More Thread Depth To Keep Bolts Tight{1058}
1977/08/08 Clean Bolt Holes In Cylinder Block Before Cylinder Heads Are Installed{1101,1201}
1977/08/15 Tools From Caterpillar To Test And Charge Air Conditioners And For Repair Of Frigidaire Compressors{7320,0651}