1979/04/04 Caterpillar


New Oil Jet Tube In Cylinder Block Gives More Clearance For Pistons And Connecting Rods

Usage:


D348, D349 Industrial, Marine and Truck Engines

Description of Change: A new oil jet tube is used in the cylinder block for the above models. The new tube assembly uses a smaller diameter tube than the former tube assembly, and the tube is bent differently. This gives more clearance to prevent possible contact with the pistons and/or connecting rods. Also, with the tube bent differently, the flow of oil hits the piston in a better location for improved cooling. Formerly, it was possible for the pistons and/or connecting rods to make contact with the oil jet tubes, and either bend or break the tubes. Either a bent or broken tube causes piston seizure.

Adaptable As: Direct replacement. The new 8N2975 Oil Jet Tube Assembly can be installed in place of the former 4N8986 Oil Jet Tube Assembly, which is canceled. A quantity of one is needed per cylinder.

The new tube assembly is in effect on engines with the serial numbers shown in the chart.

Caterpillar Information System:

1979/04/04 New Fabricated Tools Available For Service Work On 7211 And 7221 Marine Transmissions
1979/03/14 Replacement Bushing Available For Cast Iron Rocker Arms Only
1979/03/14 Information About The Use Of Earlier Cylinder Heads And Liners With Spacer Plate Cylinder Blocks; List Of Earlier Articles
1979/03/14 Revision To Guideline For Reusable Parts Is Available
1979/03/14 List Of Service Publications
1979/03/14 Larger Diameter Washer Is Used To Hold Air Transfer Pipe In Aftercooler Flange
1979/03/14 Maintenance Procedures For Extended FPTO Life On 3408 And 3412 Marine Engines
1979/03/14 Main Bearings Now Have Larger Diameter Oil Hole For Better Lubrication Of Main And Rod Bearings
1979/03/14 8L4525 Flange Is Available Again For Parts Service Of 3192 Marine Transmissions
1979/03/14 Improvements Made To Fuel Injection Pump And Governor Group
1979/03/14 New Engine Cylinder Block Used
1979/03/14 New Fuel Injection Nozzles Are Used In 3208 Engines
1979/04/04 Four Crankshaft Rear Seals Are Available For Use On 3304 And 3306 Engines
1979/04/04 List Of Service Publications
1979/04/04 New Woodward Governor Control Used On Diesel Engines; Former Control Now Used On Gas Engines Only
1979/04/04 Improved Fuel Priming Pumps Give Longer Service Life
1979/04/04 Fabricated Air-To-Water Aftercooler Available For Dynamometer Testing Of Engines Equipped With Air-To-Air Aftercoolers
1979/04/04 A Reverse Connection Of Oil Filter Hoses Can Cause Bearing Failures
1979/04/04 New Pistons And Timing Advance Unit Give Better Emissions Control And Easier Starts
1979/04/25 6V112 Repair Kit Available For Parts Service Of The 8H8558 Nut Spinner
1979/04/25 Inspection Of Connecting Rods In Parts Stocks
1979/04/25 Conversion Group Available To Install Woodward Governor On Engines Equipped With Mechanical Governor
1979/04/25 Careful, Correct Installation And Maintenance Of Fuel Injection Lines Is Very Important To Prevent Possible Engine Damage, Fire And Other Problems
1979/04/25 Inspection Of Oil Pump After Long Periods Of Service Can Prevent Engine Damage
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