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Smoking 1995 Mercury 150 Carburetor Two-stroke
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ContinuousWave Whaler Moderated Discussion Areas
ContinuousWave: Whaler Performance
Smoking 1995 Mercury 150 Carburetor Two-stroke
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| Author | Topic: Smoking 1995 Mercury 150 Carburetor Two-stroke |
| Kurt Gett |
posted 05-15-2007 12:52 PM ET (US)  
My [1995] Mercury 150-HP 2.0 litre smokes like it is being fogged when you first start it and at lower RPM. Motor has less than 100 hours on it, only a few of them by me. At [engine speeds above] 3,000-RPM there is no evidence of excessive smoke. If you are cruising, then stop and restart the motor, it smokes like its being fogged. It does not matter if it is warm or cold. I am not sure as to what type of oil is in it, or how old it is. Could this make a difference. The motor sat unused for a few years before I bought it and the orig is dead, so I have no past history. I have not done a compression test because other than the smoke it runs great up to the top RPM and doesn't miss a beat, cough or sputter. Does anyone know what could be causing this condition and what the corrective action is? Any recommendation for troubleshooting this condition? I appreciate the advice Best Regards, Kurt kurtgett@optonline.net |
| gss036 |
posted 05-15-2007 08:37 PM ET (US)
It could be several things. What year/model is the engine? Are you running the orginal gas? Could have been premixed (50-1) and are you using the onboard 3 gal oil supply tank? This would double the amount of oil as it should be set to feed 50-1 mix. Could be one of the 2 psi check valves, depening on the engine there are 3-4 at different locations. The onboard tank is pressure fed from the 3 gal tank. The onboard oil tank under the cowling gravity feeds the oil pump. Where is the oil pump set? So, as you see, you need to post a lot more info and if you are planning on keeping the motor, buy an OEM manual. |
| Kurt Gett |
posted 05-15-2007 10:00 PM ET (US)
The year is indicated in the topic... its a 1995. Observations were taken while running fresh 89 octane, not pre mixed fuel. I have read the CW data on the merc oil injection and it does not talk about smoking problems. I have the clymer shop manual also and do not see anything on smoking in there as well. However, upon careful review for the umpteenth time of the shop manual, it appears as though my oil pump linkage adjustment is completely out of wack. The Clymer shop manual is not very descriptive in this area so I am a bit apprehensive of making the adjustment that I think is neccesary (it so far out of alignment it scary). The Shop manual talks about a stamped mark on the control lever lining up with a mark on the oil pump body. To do that I have to move it over 90 degrees... I guess thats why it smokes like its being fogged. Does anyone have experience in this area? To adjust, should I disconnect the control lever linkage at the carb or the oil pump? I hope after I make this adjustment I dont start getting those annoying alarms... Thanks, Kurt |
| jimh |
posted 05-16-2007 12:10 AM ET (US)
Read my comments in Latency in Oil Mixing Systems This may account for some of the behavior you see from your Mercury. My observation of Mercury engines is that they do seem to produce more smoke at idle speeds than some other outboard motors. The oil mix ratio used by the Mercury may be lower (that is, a richer oil mixture) for low speed settings than on other brands like Yamaha Precision Blend or Evinrude OMS. |
| Tom W Clark |
posted 05-16-2007 12:34 AM ET (US)
Kurt, Yes, in my experience, the Mercury 150s smoke a LOT. But you may have an exception situation. I have two 2.0 liter Mercury 150s. I also have the factory shop manual and the Seloc manual. While it may be they do not talk about excessive smoking, per se, it is understood that the smoke is unburned oil in the exhaust of the motor. If the motor is adding too much oil to the fuel mixture then you will see and smell more smoke. Both manuals describe the correct way to determine if the mixing ratio is correct and how to adjust it if it is not. |
| Kurt Gett |
posted 05-17-2007 09:23 PM ET (US)
I adjusted the linkage to the oil pump to the specs in the shop manual and all seems well. No tool required either. Just pop it off, turn the control rod to the proper adjustment, and pop it back on. Much less smoke than before, no buzzers or bells... The amount of smoke is equivalent to what I am familiar with on the OMC's I've owned. I have to get out and see how she runs at higher RPMs under load. Thanks for the reply's Regards, Kurt |
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