1980/04/30 Caterpillar

New 1N3270 Auxiliary Drive Group Available As Attachment

Usage:

3408 and 3412 Marine Engines Equipped With A Front Power Take-Off

A new 1N3270 Auxiliary Drive Group is available as an attachment for 3408 and 3412 Marine Engines equipped with a front power take-off. The new 1N3270 Auxiliary Drive Group has a larger 180.98 mm (7.125") diameter pulley than the existing 7N8750 Auxiliary Drive Group which has a 152.4 mm (6") diameter pulley.

The new auxiliary drive group turns the alternator at a higher RPM than the existing drive group. This permits the alternator to put out more current when the engine is at idle.

The new 1N3270 Auxiliary Drive Group is adaptable to all 3408 and 3412 Marine Engines equipped with a front power take-off. If desired, conversion from an existing 7N8750 Auxiliary Drive Group to a 1N3270 Auxiliary Drive Group is possible if the 7N8751 Pulley is removed and a 1N3231 Pulley installed.

The 7N8750 Auxiliary Drive Group is still available.

Caterpillar Information System:

1980/04/30 Improvements Made To Water Separator Groups

1980/04/30 Hardened Washers Now Used On Bolts For Fan Shroud

1980/04/30 List Of Service Publications

1980/04/30 Crankcase Capacity Increased And New Oil Level Gauges Used; Specifications For Conversion Of Existing Gauges

1980/04/30 Boring Machine, Adapter Groups And Sleeves Available For Repair Of Damaged Cylinder Blocks

1980/04/30 Wrong Installation Of Oil Cooler Gasket Can Cause High Oil Temperatures

1980/04/30 Main And Connecting Rod Bearings With Cavitation Erosion Can Be Used Again

1980/04/09 Caution: Outboard Bearing Must Be Removed From Extended Shaft Of Front Power Takeoff Before The Engine Is Moved

1980/04/09 Important: Use Only 12 Volts Direct Current To Boost Start 3208 Truck Engines Equipped With Exhaust Gas Recirculation Systems

1980/04/09 Remanufactured Short Blocks Are Available For Repairs Of Early 3406 Engines

1980/04/09 Different Water Temperature Regulators Now Used To Prevent Overheating

1980/04/09 Dowtherm 209 Full-Fill Coolant

1980/04/30 Different Vibration Damper Now Used

1980/04/30 New Top Piston Ring Has Plasma-Coated Face

1980/04/30 New Liner Seat Insert For No. 1 And No. 4 Cylinders Of D353 Engines

1980/05/14 New 6V2120 Spline Sprocket Improves Depth Control Of 5P4175 Boring Tool Group

1980/05/14 Changes To 9S240 Rack Position Tool Group; Revision To Special Instructions

1980/05/14 Turbine Wheel Shroud Design Changed; Snap Ring No Longer Used

1980/05/14 Use The FT1525 Alignment Pin And FT1526 Fixture When Reconditioning Earlier 3208 Sleeve Metering Fuel Systems

1980/05/14 Changes To Oil Level Gauge Group Improve Accuracy Of Oil Level Indications

1980/05/14 List Of Service Publications

1980/05/14 Boss Can Be Removed From Spacer Plate Cylinder Block To Get Clearance For Oil Filler Tube

1980/06/04 Possible Cause Of A Low Idle Misfire And/Or Backfire

1980/06/04 Improvements To Engine Oil Lines Group Makes Installation Easier; Prevents Reverse Connections