RACE 5D6657 - Caterpillar

3306 Natural Gas EnginesDescription of Change: A new turbocharger group and three new lines groups are used on 3306 Natural Gas Engines. The new turbocharger has a watercooled bearing housing. The bearings and the bearing housing will be kept at a lower temperature, which will decrease the possibility of carbon deposits on the internal components and passages. This new turbocharger has the same performance specifications as the former turbocharger. The former turbocharger has had problems with the development of a carbon layer inside the bearing housing. This layer can gradually increase and decrease the flow of oil to the bearings. This oil is then forced out past the seal.
The new oil and water lines groups are necessary because of the new turbocharger.
The 8N6811 Caution Tag, which is part of the 2W805 Water Lines Group has the "Notice" which follows:
"Vent line must be added from manifold to higher point in cooling system external of the engine. Failure to add or properly install vent line may result in cylinder head or manifold failure."
A new water lines group (vent), which has this vent line, is also available. This group has all the parts needed to install the vent line on 3306 Natural Gas Engines equipped with a radiator supplied (from) by Caterpillar Tractor Co.
Adaptable As: The new 2W807 Turbocharger Group, 2W806 Oil Lines Group and 2W805 Water Lines Group, when used together, are direct replacements for the former 7N6111 Turbocharger Group and 8N6107 Oil Lines Group on 3306 Natural Gas Engines (7Y409-Up). These new groups and their components are shown in Chart A. To make this change adaptable to 3306 Natural Gas Engines (7Y1-408) it will be necessary to use a 5P4495 Tee and a 1W9259 Tube Assembly plus the parts shown in the chart. The tee and tube assembly are needed to connect a water line from the rear of the exhaust manifold to the turbocharger.
The new 2W829 Water Lines Group (Vent), which is shown in Chart B, is adaptable to all engines with a radiator supplied by Caterpillar. For engines equipped with a radiator supplied by another manufacturer, a similar vent system must be used.
Illustration 1. Location of the separate parts in the turbocharger group.
Illustration 2. Location of the separate parts in the oil lines group.
Illustration 3. Location of the separate parts in the water lines group.