Usage:
3304 And 3306 Industrial, Marine, Generator Set and Natural Gas Engines
Description of Change: The above engines now have new crankshaft assemblies with wider crankshaft gears. The wider crankshaft gears are used with engine front gear trains that have wider gears.
Adaptable To: The new 2W7960 and 2W7458 Crankshaft Assemblies are in effect with the serial numbers shown in the chart. These crankshaft assemblies use a wider 1W4405 Crankshaft Gear. The former 4N7692 and 4N7693 Crankshaft Assemblies had a narrower 7N4525 Crankshaft Gear.
3304 and 3306 Industrial, Marine and Natural Gas Engines use either a new 1W4506 or a former 3N1463 Crankshaft Seal Adapter. If desired, a new crankshaft assembly can be used in all 3304 and 3306 Engines with the 1W4506 Crankshaft Seal Adapter.
A new crankshaft assembly can also be used in a 3304 or 3306 Engine with a 3N1463 Crankshaft Seal Adapter, if the 3N1463 Crankshaft Seal Adapter is replaced with a 1W4506 Crankshaft Seal Adapter. The chart that follows gives the in effect serial numbers for the 1W4506 Crankshaft Seal Adapter.
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It is important to use the correct crankshaft and crankshaft gear, as shown in this article. Use of the wrong parts can result in serious engine damage.
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Illustration 1. New 1W4405 Crankshaft Gear.
Illustration 2. Former 7N4525 Crankshaft Gear.