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Year

Johnson 150 (V6) has oily plugs

rbonser Hello;
I have a 1995 Johnson 150 V6.
At startup, the engine smokes alot until warmed up. After a day of running, at least one spark plug is fouled (rpm drops from 5500 to 4800).
When I check the plugs, all of them are wet with oil.
I took the boat to the local Johnson dealer.
They changed plugs and said everything is fine. They also said to be glad it smokes a lot at startup.
I have done a compression check, and all cylinders measure between 100 and 110 psi of compression.
Can anybody help with why this engine may be over-oiling the fuel.
p.s. there are no adjustments (oil, carbs, anything) to make on this engine.
Thank you very much.
2000-12-10
Fitch They had some carb problems that year that cause a rich mixture problem. This would sometimes cause a flooding problem and would foul a plug. Does the engine seem to be using a lot of oil? 2000-12-10
rbonser Hello Fitch;
Thanks for your reply on my oily plug problem. The engine does seem to use more oil than I would expect. I would estimate it uses about a gallon of oil for every 40 gallons of gasoline. Also, the two exhaust ports (at the bottom of the powerhead, staddling the flushing port inlet) are the darkest (oily deposits) I've seen on any outboard.
Does this still sound like faulty carbs?

I sincerely appreciate your help.
Ralph

2000-12-11
ICEMAN Another possibility is you have an air leak in the fuel system before the VRO pump, this could cause the Fuel side of the VRO pump to pump faster, this would increase oil consumption. 2000-12-12
MERCMAN VRO HAS INTERNAL CRACK BETWEEN THE FUEL PASSAGE AND OIL PASSAGE NEED NEW VRO PART # 438400 SEE YA 2000-12-26
Capt DHD Hello;
Before purchasing a $225.00 VRO pump, either you or your dealer, should hook a fuel vac***e gauge to this engine. An air leak in the system could cause the problem you describe, but excessive vac***e could as well. If either is present, it will show by hooking up a gauge.
The ratio you describe is aprox 32/1 a little rich I'd say!
Your problem may well be your pump but make sure before you fork out $225 bucks.
Good Luck, Rob
2000-12-27
lake_time If you are after a new VRO pump, check out E-bay. In the last 2 weeks they have had 4 from used to new in box. All have sold for under $50 (even the new ones) Could be a cheep way to see if that is the problem.


Dave

2000-12-27

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