1991 90HP does it need oil besides the gas mix?

[iflooru]

I recently purchased a pontoon with a 91 Mercury engine, serial number OD013333, it only has about 100 hours on it. I do not have an owner's manual for it and have a couple newbie questions that I was unable to find doing a search. On the side of the engine is a site glass which is supposed to indicate what I am assuming is oil level. I am wondering if this needs to be filled along with the gas mix or wheter this is a direct injection model or both. If it needs separate oil, what type and how do I fill it, I see no fill cap? Does the engine cover had to come off? It has a Quicksilver console and was wondering what the beeps indicate? I get a continous beep with the trim fully down but it turns off if I give it just a bit of trim...oil warning or overheating? Finally does Mercury offer their owner's manual online in PDF format or must I buy one? The out of state marina I bought the boat from took me for a test drive and went over the boat with me and purchase but never made mention of this resevoir. TIA<br /><br />Geo in Cleveland

 

[Spidybot]

Re: 1991 90HP does it need oil besides the gas mix?

Hey Geo!<br /><br />You open the cover (cowling) by pulling the left side (viewed from the boat, facing the motor) of the hinged front-cover with the Merc. decal. Then release the spring-loaded lock. Now you can turn both halves of the cover away (and even lift them off.<br /><br />The oil reservoir is to be kept full.<br /><br />Use two-stroke oil with TWC-3 rating, preferably of a known brand.<br /><br />The alarm sounds a self-test when key is turned. After that it indicates low oil or heat warning. When it start beeping for oil you have sufficient for about an hour at full speed.<br /><br />The motor is running on plain unleaded 87 oct fuel without oil. It simply adds oil (from the reservoir) as needed (variable range 80:1 to 50:1) when it runs.<br /><br />The original owners manual is pretty good but I'd suggest an aftermarket manual (link on this page) as it goes more into detail and is explanatory.

 

[iflooru]

Re: 1991 90HP does it need oil besides the gas mix?

Thanks for the quick reply, when I had it at the gas dock they put 2 things of oil in the gas tank and then added about 12 gallons of gas. So you are saying that I do not need to add oil to the gas tank and instead just run plain gas and keep the oil in the engine resevoir? What is it's approx capacity...quart, gallon, pint?

 

[Spidybot]

Re: 1991 90HP does it need oil besides the gas mix?

Then the gas-man made you run double oil rate.<br /><br />You're right: Oil in the oil reservoir ONLY an plain fuel in the fuel tank ONLY. The motor mixes by itself by blending the two.<br /><br />Only thing to do currently is top her up with fuel only whenever you can, to thin out that excess oil in the fuel tank.<br /><br />I do not have the manual with me just now, but there is a measure on the reservoir. I always carry a spare bottle, but if you fill it up every now and then you'll be fine. The reservoir holds enough for several tanks of fuel.

 

[CARLOS]

Re: 1991 90HP does it need oil besides the gas mix?

YOUR ENGINE 0D013333 IS A 60HP YEAR 1992, 3 CYL... MODEL: 1090412LD.<br />USE ANY OIL TCWIII, QUICKSILVER, CASTROL, ETC<br /><br />REGARDS<br /><br />CARLOS