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
Back to top
The names Caterpillar, John Deere, JD, JCB, Hyundai or any other original equipment manufacturers are registered trademarks of the respective original equipment manufacturers. All names, descriptions, numbers and symbols are used for reference purposes only.
CH-Part.com is in no way associated with any of the manufacturers we have listed. All manufacturer's names and descriptions are for reference only.