1979/08/22 Caterpillar


New Rocker Arms And Rocker Arm Shaft Have Improved Lubrication

Usage:


All 3304 and 3306 Industrial, Marine, and Truck Engines

Description of Change: An improved rocker arm shaft assembly and exhaust and inlet valve rocker arms are now used on the above models.

The location of the oil hole in the new rocker arm shaft is about 45° below horizontal, with the shaft installed. The new rocker arms have a groove on the inside of the bearing. These changes give better lubrication between the shaft and rocker arm bearings. For this reason these parts will have a longer service life.

Adaptable As: The new rocker arm shaft and rocker arms, used together, are a direct replacement for the former parts as shown in the parts chart. The former parts are canceled. Either the new or former rocker arms can be used with the former rocker arm shaft. The former rocker arms must not be used with the new rocker arm shaft.

Caterpillar Information System:

1979/08/22 List Of Service Publications
1979/08/22 Sealant Now Used On Pipe Plugs At The Bottom Of The Oil Filter Base Assembly To Prevent Oil Leakage
1979/08/22 New Cylinder Head Gasket Has Smaller Diameter Cylinder Openings To Improve Location Of Combustion Seal Ring
1979/08/22 New Design Thrust Plate Used In Crankshaft Group
1979/08/22 Only One Dowel Pin Is Now Used To Hold The Thrust Bearing In The Correct Position
1979/08/22 Exhaust Manifold And Air Lines Groups Changed To Prevent Exhaust Leakage
1979/08/22 New Seal Used Under Retaining Bushing For Fuel Injection Pump Bonnet
1979/08/22 When Timing The Engine, Be Sure The Timing Bolt Is Installed In The Correct Hole In The Flywheel
1979/08/22 Turbocharger Bearings Are Now Available In More Different Sizes For Better Turbocharger Reconditioning
1979/08/22 New Rear Cover And Gasket Used On Water Pump
1979/08/22 New Governor Housing Assembly Used In Governor And Fuel Injection Pump Group
1979/08/22 Why Engines Are Damaged By Fuel Sulfur
1979/09/19 Engines Can Use Crankshafts With Either Six Or Eight Counterweights
1979/09/19 6V190 Clamp Is Available For Use On Sleeve Metering Fuel Systems
1979/09/19 Different Grease Fitting Now Used In Fan Drive Group
1979/09/19 Keystone Piston Groups Can Be Installed In Earlier Engines In Steiger Tractors
1979/09/19 Tee Handle Hexagonal Wrench In Rack Adjusting Tool Is Now Available For Parts Replacement
1979/09/19 New Main And Connecting Rod Bearings Have A Thicker Layer Of Surface Material
1979/09/19 Pin Bore Is Now Offset (Not In The Center) .059" (1.5 mm) In The Piston To Stop Vibration Of The Cylinder Liners Which Can Cause Pitting On The Coolant Side Of The Cylinder Liners
1979/09/19 Service Kit Is Available For Woodward UG8 Governor
1979/09/19 New Bracket Available For Installation Of Jacket Water Heater
1979/09/19 Electrical System Voltage Must Be Limited To A Maximum Of 40 Volts With Woodward Model 2301 Governors.
1979/09/19 New Gasket Used In Water Lines Group For Aftercooler
1979/09/19 New BrakeSaver Control Valve Group Has Improved Diaphragm
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