1958 evinrude

[steeliebug]

can some one tell me what kind of lower unit oil to use on a 1958 7.5 hp evinrude? next to the fill plug it says to use hypoid oil only. I have no idea what that is. Also i noticed when i drained the old oil that it was really thick and i can tell water is getting into it because of the brown color. Is there a seal that i can replace easily first and see if it helps before takeing it to a repair center? Thanks for any help givin.

 

[Paul Moir]

Re: 1958 evinrude

Hypoid oil's are for hypoid/helical cut gears. Since just about every modern outboard uses hypoid cut gears, any modern outboard gearcase oil is hypoid oil. Usually you can tell if it's hypoid oil 'cause it stinks. <br />Interesting, huh? ... No? Well then, just use any 90 weight outboard gearcase oil. OMC/BRP HiVis is the proper stuff from the dealer if you shop there. Water intrusion makes the lower unit oil look grey or brown like coffee with cream, depending on the brand of oil. Black or black coffee colour is good - just used. <br />If you've got water intrusion, start by changing the nylon gaskets on the fill and drain screws. By far, it's through these these that water usually comes in through. They ought to be replaced every time you refill the l/u. Just check it again after you use it some to see if the lube gets contaminated. Only then start worrying about seals.<br />Even if the seals are leaking, it's pretty simple to work on that gearcase yourself. No special tools are needed other than a manual. And basic mechanical skills naturally.<br /><br />Hope this helps!

 

[kevin500]

Re: 1958 evinrude

Greetings.<br />(I was employed by an oil company as a lubes guy) Make sure you use outboard gear oil. Outboard oil has a water emulsifier in it that allows it to perform with up to 10% water, to get you home, so you repair it. If you are in a store looking at automtotive gear oil, it may be cheaper, it may be hypoid, but it can handle only up to 2% water. These percentages are approximate, but they give the general idea. The extra few percent could mean the difference between motoring and paddling, so pay the extra, happy trails!.