E-TEC 90-degree V6: Variations in Oil Systems

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jimh
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E-TEC 90-degree V6: Variations in Oil Systems

Postby jimh » Mon Jun 26, 2017 2:02 pm

Evinrude legacy (or non-G2) E-TEC engines based on the 90-degree V6 design of 3.3 and 3.4-liter displacement have used four different arrangements for delivery of oil to the engine cylinders and crankshaft. All models use an electrically-operated oil pump that is somewhat of a derivative in design from the E-TEC fuel injector. The pulsed pump operates from the 55-Volt DC main power bus. The flow of oil out from the pump is monitored by an analog pressure sensor. The E-TEC EMM watches the sensor to establish that the oil output pressure has exceeded a minimum pressure threshold; in this way the EMM can decide if the engine is receiving the proper flow of oil.

First method 2005 to 2007, intake manifold oiling: the initial production 90-degree V6 E-TEC engines, beginning c.2005, pumped oil only into the intake manifold. The oil pulse pump delivered oil to a manifold that split the flow into several lines, which then carried the oil to several ports on the intake manifold, where the passing air stream would carry the oil on to the moving parts of the engine. Also in these early models, there is a single oil line that delivered oil to the fuel line upstream of the fuel lift-pump, mixing some oil into the gasoline that was being delivered to the injectors.

Second method 2007 to 2008, multi-point oiling: in model-year 2007 beginning with the F-suffix model sequence, a second oil hose distribution manifold was added, located at the rear of the power head. Oil from a port on the first manifold was routed to the second, which then branched into more lines. The new lines delivered oil at the intake ports of the cylinders.

Third method 2008 or 2009 and later, cylinder sleeve oiling: on 3.4-liter models made in 2008 or later, and on 3.3-liter models in 2009 or later, the new lines from the rear distribution manifold were rerouted to deliver oil to the cylinder sleeves. This provided better oiling at the pistons.

Fourth method 2011 and later, second oil pump: 3.4-liter models have a second oil pump at the rear of the engine instead of just a distribution manifold. This smaller pump is not fitted with a pressure sensor. Use of the second pump improves the accuracy of oil distribution to the cylinder sleeves.

Evinrude has published a recorded presentation on youTube that describes these changes and identifies component locations.

I have posted this to the PERFORMANCE discussion because that is where most outboard engine related discussion occurs.