1979/03/14 Caterpillar

New Piston And Connecting Rod Are Tapered In Area Of Piston Pin


3208 Industrial (90N37285-Up),
Marine (75V4002-Up),
Vehicular (79V5380-Up),
and Truck (32Y1-Up) Engines

Description of Change: The pistons and connecting rods used in the above 3208 Engines are of a different design than those used in earlier engines. As shown in the Illustration, the sides of the new connecting rod and the inside of the new piston in the area of the piston pin bore are tapered. Formerly, the sides of the connecting rod and the inside area of the piston were straight. Also, the crown area of the new piston is thicker than the former piston.

The different design of the new piston and connecting rod is needed because the 3208 Engines now have higher cylinder pressures. The higher cylinder pressures are caused by a faster fuel injection rate. A thicker crown on the new piston gives added strength in this area. Also, the new piston is stronger than the former piston because more of the piston pin is in the bore of the new piston.

New tapered connecting rod.

6V100 Tool Arrangement in use.

Adaptable To: The new parts used together, are adaptable to all earlier 3208 Engines. The weight of the new piston and rod is exactly the same as the former piston and rod. The same piston pin is used in both. For this reason, a new piston, rod, and pin can be installed in one or more cylinders of an earlier engine and the engine will still be in balance. It is not necessary to install a complete set of pistons and rods if new parts are installed in earlier engines.

NOTE: The 6V100 Tool Arrangement must be used to correctly remove the old piston pin bearing and install the new bearing in the tapered connecting rod.

Caterpillar Information System:

1979/03/14 New Oil Filter And Filter Base Assemblies
1979/03/07 New Exhaust Pipe Connector Makes A Tighter Seal Between Pipe And Manifold
1979/03/07 Retroreflective Tape Makes Phototach Kit Easier To Read
1979/03/07 Window Cover Kit Now Available For ENM Service Meters
1979/03/07 Use SIRS To Keep Service Literature Current
1979/03/07 Check Valve Must Be Adjusted Correctly To Let Fuel Flow Through The Return Line And Back To The Tank
1979/03/07 New Fuel Injection Lines Groups Use A Different Fuel Injection Nozzle Assembly
1979/03/07 Engine Valve Springs Are Now Made Of Carbon Steel Alloy
1979/03/07 New Manifold Assembly Gives More Room For The Lifting Eye
1979/03/07 New Exhaust Valve And Valve Guide
1979/03/07 Engine Mounted Exhaust Brake Systems Can Be Used To Extend Service Brake Life
1979/03/07 High Sulfur Fuel Can Cause Severe Engine Wear And Internal Damage
1979/03/14 New Fuel Injection Nozzles Are Used In 3208 Engines
1979/03/14 New Engine Cylinder Block Used
1979/03/14 Improvements Made To Fuel Injection Pump And Governor Group
1979/03/14 8L4525 Flange Is Available Again For Parts Service Of 3192 Marine Transmissions
1979/03/14 Main Bearings Now Have Larger Diameter Oil Hole For Better Lubrication Of Main And Rod Bearings
1979/03/14 Maintenance Procedures For Extended FPTO Life On 3408 And 3412 Marine Engines
1979/03/14 Larger Diameter Washer Is Used To Hold Air Transfer Pipe In Aftercooler Flange
1979/03/14 List Of Service Publications
1979/03/14 Revision To Guideline For Reusable Parts Is Available
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 Replacement Bushing Available For Cast Iron Rocker Arms Only
1979/04/04 New Fabricated Tools Available For Service Work On 7211 And 7221 Marine Transmissions
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