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Author Topic:   OptimMax 225-HP: Carbon Deposits on Propeller Hub
Milepost43 posted 05-20-2005 09:28 AM ET (US)   Profile for Milepost43   Send Email to Milepost43  
I notice some very black, hard deposits of carbon just inside the exhaust hub of my 2004 225-HP OptiMax outboard motor. I talked to Mercury technical support, and they said [it was] probably no problem. The motor seems to run fine during two weeks of use on Lake Erie. I seldom run slowly with the motor--no trolling. Have others seen these deposits? What should be done? Thanks.
bluewaterpirate posted 05-20-2005 10:33 AM ET (US)     Profile for bluewaterpirate  Send Email to bluewaterpirate     
I have some [hard, black carbon deposits on the inside of the exhaust hub] on [my Optimax 225-HP] after 650 hours [of use]. Not a [problem]. Tom
LHG posted 05-20-2005 11:54 AM ET (US)     Profile for LHG    
Be sure you are using QuickClean.
lakeman posted 05-20-2005 01:56 PM ET (US)     Profile for lakeman  Send Email to lakeman     
I had a talk with a knowlegable Mercury representative last week. I brought up carbon in the conversation, and he said that Mercury, for some reason or another, has never had a great deal of carbon problems. He did recommend Quickleen, as mentioned above, about every other tank full. I use a product in my OptiMax called PRI-G; so far, so good. I also ocassionally use it in my wife's Corvette and in my truck.
bluewaterpirate posted 05-20-2005 06:17 PM ET (US)     Profile for bluewaterpirate  Send Email to bluewaterpirate     
I need to clarify my above post. I have the normal black soot from the exhaust. I use Quickleen all the time. I still have the original plugs. The 225-HP Optimax is still running great. It has been a terrific motor. Cheers, Tom
Milepost43 posted 05-20-2005 08:21 PM ET (US)     Profile for Milepost43  Send Email to Milepost43     
Thanks for the replies. My [very black, hard deposits of carbon just inside the exhaust hub] are definitely more than soot. Some are spherical and about 1/3 the size of a pea. I haven't been using QuickClean. I will now. Maybe that is the problem. Thanks again.
dhlaw posted 05-20-2005 08:22 PM ET (US)     Profile for dhlaw  Send Email to dhlaw     
I have had the same deposits on my 2000 225's and never had [a problem]. I also run the OptiMax oil. I usually make it a point to scrub out the hub after running. I think you are fine.
jimh posted 05-22-2005 08:07 AM ET (US)     Profile for jimh  Send Email to jimh     
My seat-of-the-pants theory: the amount of soot on the exhaust hub is indicative of how the engine is running, and how well matched the propeller and boat. A great deal of soot build-up on the propeller exhaust hub is an indication of perhaps too much propeller pitch, which, in turn, has been lugging the engine and causing it to have a smokey, sooty exhaust.

Using Quickleen tends to produce more smoke in the exhaust. This additive is a solvent which dissolves carbon and other deposits in the cylinders. The material is flushed out the exhaust. If anything, it would seem that Quickleen would increase the amount of carbon in the exhaust, not reduce it.

jimh posted 05-22-2005 08:12 AM ET (US)     Profile for jimh  Send Email to jimh     
The choice of oil may affect the amount of soot in the exhaust. I believe one of the properties of the OptiMax-grade oil is better tolerance for high temperatures. I believe the low-emission two-stroke engines, like the OptiMax, have higher temperatures in the combustion chambers. The higher temperatures require an oil with better properties at those high temperatures.

Has the OptiMax engine with the hard, black, granular carbon deposits on its propeller exhaust hub been run with OptiMax-grade oil?

handn posted 05-22-2005 08:32 PM ET (US)     Profile for handn  Send Email to handn     
I had similar deposits with my 225 Optimax using Optimax oil.
Milepost43 posted 05-22-2005 08:51 PM ET (US)     Profile for Milepost43  Send Email to Milepost43     
Always have used Optimax oil but no QuickClean.
dauntlass 18 posted 05-23-2005 04:36 PM ET (US)     Profile for dauntlass 18  Send Email to dauntlass 18     

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