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Seanwade

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Reply with quote  #1 
Hey fellas can I get some advice on the white steam coming from the back of my 2015. 115 hp e-tec. I no some people say this is normal but I am talking about a lot of it. No alarms and seems to run great. Steam is very visibale while running as gets worse after slowing up. This is not smoke. Also happens in summer and winter and every trip I live in nth qld so ambient temp is not too cool.
muskiemouth

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Reply with quote  #2 
Quote:
Originally Posted by Seanwade
Hey fellas can I get some advice on the white steam coming from the back of my 2015. 115 hp e-tec. I no some people say this is normal but I am talking about a lot of it. No alarms and seems to run great. Steam is very visibale while running as gets worse after slowing up. This is not smoke. Also happens in summer and winter and every trip I live in nth qld so ambient temp is not too cool.


The steam is normal. The steam comes out of the muffler as the exhaust is cool with water that is sprayed into it. It's generally more noticable when coming off plane.

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seahorse

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Reply with quote  #3 


Steam coming out if the idle relief port
The steam you notice is a normal occurrence on most outboard motors. The exhaust gases exiting the engine block may reach the 1200-1500°F range when under heavy load. They are directed down an exhaust chamber inside the midsection and out the propeller hub. Some of the cooling water from the engine is directed to quiet and cool the exhaust gases as well as surrounding the exhaust chamber, further silencing the motor. At higher speeds the exhaust chamber becomes very hot internally and the cooling water injected into it turns to steam and is expelled through the propeller hub while the boat it underway. When you slow down by pulling the throttle back, the pressure and the volume of exhaust is greatly reduced, yet high temperatures remain inside the chamber and the steam then exits through the idle relief port. That is the whitish gray vapor that you see coming out of the back of the motor and is perfectly normal. As the motor idles, the exhaust gas temperatures subside and the visible steam practically disappears. In cooler humid weather, you may notice it more, just like out of the exhaust pipe of your vehicle on a cold day.

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Seanwade

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Reply with quote  #4 
Thanks for the reply. But while I am on the plain the steam from the exhaust is excessive. Thick enough to block the view of the water. Even at high speed. Get worse when I pull up. Not all e-Tecs seem to do it. My mates motor same year and hp doesn’t do it. We fish often together in 2 boats and is not comparable
steelhead

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Reply with quote  #5 

Has this problem existed since boat/motor new?

Salt water or fresh only?

What' the motor temperature gauge read when "steaming exhaust"?
If no motor temperature gauge, please post recent EMM Engine Report.

What is the WOT rpms?  Analogue or digital tach?

Any recent decrease in WOT rpms?

Boat and normal loaded total weight of all?

The V4 motors are unique with their long tuned exhaust system in the inner exhaust housing with exhaust valve.  When one comes off plane above approx 4500, exhaust valve dumps hot wet exhaust loaded with water into the longest runner section which is bone dry and super hot from being sealed off by the exhaust valve from any cooling exhaust water.  Water flashes to super hot steam.

Last water pump, thermostats and PRV valve service/replacement?  Thermostats are critical for sufficient cooling water flow since the PRV shuts off completely on throttle down below 1500 rpms.
Last time block and heads reverse flushed through thermostat ports?

Motor water pressure gauge and readings?

What prop and hub diameter?
A hub exhaust ring used?

Water passages in the heads partially blocked by sand, seaweed, marine bivalve growth can cause super hot exhaust water that flashes to steam quickly

Use infrared heat gun and shoot each head in several same general places and record temps while on plane at +4500 rpms

Huey

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Reply with quote  #6 
As mentioned normal and hard to comment without seeing the amount of steam on your boat, will be different from your mates boat, you refer to. If the engine is not going into SAFE mode it is not hot and if you are worried about it, make sure the dealer fits the lighter PRV spring and also if a L/S V4 get them to fit the V6 water pump housing, glue the cup in and seat the impeller.
Seanwade

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Reply with quote  #7 
Thanks for reply. Motor is used in salt water. Serviced by e-tec dealer every 100 hrs Water pump and total service just done still steaming. This is a new power head with 120 hrs on it serviced twice. Original power head had many issues and was replaced under warrenty. It also steamed a lot. I have asked about a bigger water pump to no avail. Have taken to 2 e-tec mechanics to no avail. One said a faulty egr vaulve. The other checkered it and said no issue with it. Don’t no where to turn but am disappointed with so many problems
Huey

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Reply with quote  #8 
I gave you a solution to a problem you think you have even though it is not getting too hot and you still want to complain? Nothing more we can do on here if you do not want to take this advice
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