80hp Mercury

[Russell48]

I have a 1980 80hp long shaft that I got on my 24ft pontoon,,An I just check the oil in the lower unit an it is a lite brownest color,, I think it means that the water is getting in there an going to have to tear off the lower unit an put new seals in it,, Can anyone help me with this,, I am deaf an can't hear for anyone to tell me so I found this forum an hopen to get help,, I was hopen to find a digram with the unit taken apart but didn't,, I am very good with doing stuff like this if I can see it done or if it wrote down,,, I am new to this forum an hope to get help,,, Thanks,,,

 

[Dreworr123]

Re: 80hp Mercury

http://www.mercruiserparts.com/SelectProductLine.asp
That site helps me a lot. You just need the model and serial number off the engine

 

[Russell48]

Re: 80hp Mercury

Oh ok,, Thanks,, I will get the number,, Then look at the site you sent me ,,, Thanks,,

 

[Russell48]

Re: 80hp Mercury

Man O Man,,lol,, That sure looks like a very good site,, Now I got to try an find out how much the seals are for what I have before I take mine apart,,, Has anyone had to put in the seals to keep the water out of the lower unit??

 

[Russell48]

Re: 80hp Mercury

An one more thing I like to ask,,, When my motor is idleing low then my water pump is not pumping that good but if I give it just a little gas then it is just fine So should this be noarmal,,??? I put this motor on my pontoon by myself an had to hook up the cables an all an they seem to be ok,,

 

[Chris1956]

Re: 80hp Mercury

No, you should have a good telltale at all times. Make sure the telltale is clean as they clog easily. Sounds like you need to install a new impeller gaskets and wearplate.

BTW - Some of the gearcase seals are pretty tough to install. I recommend you install the easy ones and retest. Replace the waterpump base. It will come with a new driveshaft seal. Make sure the driveshaft is clean and well lubed, befor you try to install the new waterpump base. Replace the washers on the drain and fill plugs, fill with new gear lube and retest.

 

[SeaKaye12]

Re: 80hp Mercury

Here's a good chance for one of the pros here to do a "sticky" on the procedures involved in testing and replacing the seals on popular Mercury engines....

Will someone step up to the plate? Maybe an accompanying video and/or lots of pictures?

Maybe it already exists on the site someplace...but I've been looking and haven't found it.

Chuck

 

[Mi duckdown]

Re: 80hp Mercury

Russel48 Your best bet is to buy an OEM MERC manual, (not seloc/clymer) for that motor. you must have serial number to buy the correct manual. About 100 bucks new,can be ordered from a merc dealer, Or @ Mecury Marine .com, I think. There are pleny OEM manuals on ebay for half the the price. but you will need serial number also, for the correct one.
I hope this helped.

 

[Russell48]

Re: 80hp Mercury

Sure thanks guys,, An is it bad when ya have black oil like come out the prop,, I have been told that it is just the oil an gas mix an was just wondering,,, Thanks again,,