1981/01/21 Caterpillar

Exhaust Elbow Support Improved

Usage:

D348 Industrial And Marine Engines

Description of Change: An improved exhaust elbow support is now used in D348 Industrial and Marine Engines.

Some areas of the support have been made thicker for added strength. Also, spotfaces have been added to the four 13.49 mm (.531") diameter holes to give better surfaces for the bolts and washers.

Before the improvements, it was possible for the support to have cracks caused by stress around the bolt holes. The cracks permitted coolant leakage from the cylinder block.

Adaptable As: The improved 8L4899 Exhaust Elbow Support is a direct replacement for the earlier 8L4899 Exhaust Elbow Support. The part number did not change.

The arrows (marks) show the areas where the thickness has been increased. Spotfaces also are shown.

Caterpillar Information System:

1981/01/21 List Of Service Publications

1981/01/21 Use 2P2333 Manifold Sealer On Exhaust Manifold Slip Joints (Junction) During Assembly

1981/01/21 Larger Plug Used In The Ends Of The Rocker Arm Shaft Assembly

1981/01/21 New Bearing Sizes And Identification Codes For AiResearch Remanufactured Turbocharger Cartridges

1981/01/21 6V4019 Camshaft Pilot Group Is Available

1981/01/21 New Connecting Rod And Main Bearings Have A Thicker Coating (Layer) Of Lead-Tin Overlay

1981/01/21 Improvements Made To 5P9718 And 6V186 Disc Pads Used During Gasket Removal

1981/01/21 New Control Valve Group Used To Prevent Ratchet-Type Noise And Rough Clutch Engagement

1980/12/10 Use Fluid-Type Vibration Damper To Control Vibrations

1980/12/10 Different O-Ring Seal Now Used On The Oil Pump Suction Tube

1980/12/10 Two Thinner Spacers Available For Use During Adjustment Of Off-Engine Timing Dimension

1980/12/10 New Gasket Improves Operation Of Shut-Off Groups

1981/01/21 FT1576 Puller Plate Used For Removal Of Crankshaft Gear; Drawings For FT1576 Puller Plate Can Be Used For Modification Of Existing Puller Plate

1981/01/21 Thicker Layer Of Chrome Now Used On Governor Spring Guide To Extend Its Service Life

1981/01/28 6V3150 Engine Pressure Group And 6V3121 Multitach Group Are Available For Testing Engines

1981/01/28 New Chart Has "D379, D398, D399 Lubrication And Maintenance Checklist"

1981/01/28 Pipe With Orifice Now Used In Regulator And Housing Groups For Cooling Systems

1981/01/28 Inspection And Test Procedures To Follow When Fuel Ratio Control Does Not Operate Correctly

1981/01/28 New Exhaust Manifold Has Slip-Joint Connections

1981/01/28 New Aftercooler Core Has Copper-Nickel Tubes For Increased Strength

1981/01/28 New Camshaft Has Improved Profile (Shape) Of Exhaust Cam To Extend Service Life

1981/01/28 New, One-Piece Valve Lifter Used

1981/01/28 Corrected "5.4" 60°V Main Bearing Selection Guide" Is Now Available

1981/03/04 High Concentration Of Aluminum In Oil Analysis Can Be The Result Of Rocker Arm Support Wear