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Author Topic:   Mercury Engine with Removed Oil Mixing Loses Acceleration, Leaks
slyclops posted 04-12-2015 07:17 PM ET (US)   Profile for slyclops   Send Email to slyclops  
[This thread was appended to an old thread discussing a reference article about the Mercury oil system. This article changed the topic to discuss problems associated with modification of an engine to remove the oil system. This different topic is now its own thread--jimh]

I removed all oiler parts from my [outboard engine, which is apparently a Mercury of unspecified age and horsepower--jimh]. It seems to run fine with two exceptions:

--seems to have lost some [acceleration from a standing start]; it used to jump damn near straight up, and now it take three to five seconds to get up to plane;

--after a 10-mile high-speed run, there is oil leaking out from under the cowling that appears to be burned 50:1 two-cycle oil, and it is coming from the carburetor area. All oil tanks have been removed.

What might cause the loss of acceleration and the leak of oil?

jimh posted 04-13-2015 01:25 AM ET (US)     Profile for jimh  Send Email to jimh     
I believe the same problem is causing both symptoms: something in the method you employed to remove the components of the oil mixing system has caused the problem.

The loss of power for acceleration could be due to having too much oil in the fuel. That could also lead to problems with oil coming out of the fuel-air mixture and collecting in the air silencer around the carburetors, eventually leaking out of the air silencer.

What make, model year, and horsepower is your engine?

jimh posted 04-15-2015 10:37 AM ET (US)     Profile for jimh  Send Email to jimh     
If there is any air leak into the fuel system from the old components removed, this could also affect the engine operation.

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