Check Turbocharger Seals If There Is A Sudden Increase In Crankcase Blowby{1052,1317}
Usage:
3176 (2YG, 7LG),
3176B (9CK),
C-10 (2PN),
C-12 (1YN) Truck Engines
If one of these truck engines is producing the correct power and running well, but SUDDENLY develops excessively high blowby, check the turbocharger shaft seals. The failure of a turbocharger shaft seal may allow inlet manifold boost pressure to be felt in the turbocharger oil drain line. This could result in excessively high blowby.
Many times when service personnel troubleshoot an engine that has excessive blowby, they assume the cause is piston ring and cylinder bore wear. This is usually a slow wearing process that results in a gradual increase in blowby. Usually, when a turbocharger shaft seal fails the result is a SUDDEN increase in blowby.
Caterpillar Information System:
1996/11/01 Fuel Injection Pump Bushings Have New Groove Adjacent To Load Ring {1251}
1996/11/01 Improved Fuel Pump Plunger Helps Prevent Plunger And Sleeve Scuffing In Service 8.5 mm Fuel Injection Pump Assembly For Sleeve Metering Fuel System (SMFS) Governor And Fuel Injection Pump Groups{1251,1286}
1996/10/01 Improved Water Pump Groups Available{1361}
1996/10/01 New O-Ring Seals Used On "Through-Head-Adapter" And "Internal Fuel Lines" In Fuel Injection Lines Groups{1252}
1996/10/01 Procedure For Installing Steel Core Gasket At The Front Housing And The Flywheel Housing{1151,1157,1162}
1996/10/01 New Torque Specification For Injector Rocker Arm Adjustment Lock Nut{1123}
1996/10/01 An Improved O-Ring Seal And Proper Use Of Adapter Locks Reduces Oil Leaks{1252}
1996/09/01 New Control Group Does Not Have An Oil Pressure Sensor And Requires Installation Of A Sensor Kit {1904,1924}
1996/09/01 New Governor Weight And Race Increase Durability {1264}
1996/09/01 Use Two Piece Ferrous Articulated Pistons Instead Of Aluminum Pistons {1214,1331}
1996/09/01 New Parts Available To Eliminate Wear Between The Oil Cooler Bonnet And The Elbow {1378,1380}
1996/09/01 New Plastic Outlet Sleeve Used On 3208 Engines {1380}
1996/12/23 July 1996 Software Release{1902}
1996/12/23 New Thinner Exhaust Manifold Gasket Used{1059}
1996/12/23 New Oil Supply And Drain Lines In Turbocharger Oil Lines Groups Used With "Mid-Mount", "New Mid-Mount", And "Low Mount" Arrangements{1307}
1997/01/27 New Remanufactured Water Pump Groups Include Cast Iron Impellers{1361}
1997/01/27 Description Of August 1996 (AUG96) Software Modifications{1902}
1997/01/27 Points To Remember When Replacing A Viscous Crankshaft Damper Assembly With A Rubber Crankshaft Damper Assembly{1205}
1997/01/27 Timing Procedure Aid -Alignment Of Timing Gear Marks On 3406 Engines{1206}
1997/01/27 New Gasket Used Between Air Compressor And Front Housing{1803}
1997/02/24 New O-Ring Seal Used In Hydraulically Actuated Electronic Unit Injector (HEUI) Pump Group{1714}
1997/02/24 New Specifications For Pressure Drop Across The Air-To-Air Aftercooler{1063}
1997/02/24 Improved Bushing O-Ring Seal Available For Injection Pump Groups{1251}
1997/02/24 Summary Of Changes To Timing Advance Drive Groups (Update){1272}