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Author Topic:   Mercury oil switch
MilwaukeeWhaler posted 01-28-2002 03:30 PM ET (US)   Profile for MilwaukeeWhaler   Send Email to MilwaukeeWhaler  
I have heard that there is a switch on my 1995 Mercury 90 that leans out the oil mixture when my break in period is over. I used a ton of oil last year and I am wondering if the switch was ever made. The owners manual mentions this in passing however no diagrams. Any thoughts?
Clark Roberts posted 01-29-2002 06:46 AM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
Look at the oil pump and move throttle and you will see the actuating rod move a small disc shaped (about the size of a quarter) piece on which there are two scribe marks. At idle/neutral throttle position one of these marks will align with a fixed scribe mark. Adjust so that alignment is with the other mark.. easy to do once you focus your eyes... oops dropped that screw drive again!!! your local mechanic can do it in about a minute!!!! Happy Whalin'... Clark...Motorpool Div of Spruce Creek Navy
MilwaukeeWhaler posted 01-29-2002 09:02 AM ET (US)     Profile for MilwaukeeWhaler  Send Email to MilwaukeeWhaler     
Much obliged!
linhans posted 04-01-2002 02:14 PM ET (US)     Profile for linhans  Send Email to linhans     
My nearly new 1999 Mercury 90 has also a high oil consumption. I can not find the oil switch as discribed for the 1995 model. How does this work for the 1999 model?
Clark Roberts posted 04-02-2002 07:23 AM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
Linhans, the 99 model is same! Look at the oil actuating rod (as described above) and the adjustment will be obvious and if not I suggest you grab a maint/repair manual for that series engine (borrow one from local mech. if you can) and study up on the whole system. If you're not sure about the adjustment I suggest you not attempt but take to mech and have it adjusted from "break-in" position to "run" position. Good luck and happy Whalin'... Clark... SCN

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