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  1998 Mercury 75 HP 2 Stroke Oil Inj. Adjustment

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Author Topic:   1998 Mercury 75 HP 2 Stroke Oil Inj. Adjustment
Andy Holmes posted 07-08-2002 02:59 PM ET (US)   Profile for Andy Holmes   Send Email to Andy Holmes  

It seems that about a year or so ago, there was a post on here about there being a factory setting on the oil injection for break-in, that you could re-set after the break-in period. My engine is running a little rough at idle and smokes quite a bit. I checked the service manual (factory manual) and there is nothing in it about break-in at all. I have about 40 hours on it now, and suspect that it is pumping too much oil. Any thoughts would be appreciated.


Andy Holmes

jstachowiak posted 07-09-2002 07:17 PM ET (US)     Profile for jstachowiak  Send Email to jstachowiak     
You need to talk or look at two different sites regarding outboards and repairs.
Look at forums about outboards. You will read on several posts that oil injection units are historically unreliable and most people disconnect them and mix their fuel and oil 50:1.

I have a 1979 90HP merc on my renovated 1979 Newport 17 and I mix the oil. I had oil injection on my 40HP 1992 Johnson and never had a problem, but it did smoke alot, but did not use much oil.

Remember at 50:1 that is a little less than a quart every 10 gallons.

Clark Roberts posted 07-10-2002 08:23 AM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
Andy, the posts you reference are from me so here goes again! BTW, I have owned maybe 50 oil injected Mercs and have never had a single problem and believe the gear driven, positive displacement pump to be highly reliable! Here's the scoop on the oil ratio adjustment... there are two (some may have 3) scribe marks on the actuator body (mounted to pump at end of actuator rod) and there are two scribe marks on the pump. Align the left-most marks on each and this is the correct position for lowest oil consumption... I'm looking at a picture of this at present in an "Service Manual" for 70-115hp Mercs... The only routine maintenace that I do (on any of my currently 5 Mercs)is to check, about once a year, the plastic hoses connecting internal oil tank to pump. I believe that these hoses can fail with age although have never had one go bad. Get your hands on a service manual and check it out.. the whole system is really very simple! Happpy Whalin!... Clark... Spruce Creek Navy
PS> E-mail me if you want more info

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