1983 Merc 120: Oil Vent Location?

[BarryBob]

I have a 1983 Glastron with a 120 Mercruiser. I have found the bottom oil fill and have located a "oil vent" up high, above the steering pistons.<br /><br /> I filled the lower hole with a squeeze tube (1 qt. bottle) but nothing came out the top vent hole. Newer Merc owners say their oil vent hole is no more than 10" from the bottom hole. <br />Do older Mercs have the vent higher or is there another vent hole closer to the bottom? <br /><br />Thanks, <br /><br />Barry

 

[rodbolt]

Re: 1983 Merc 120: Oil Vent Location?

hello<br /> wow took me a moment to figgue that out.<br /> you have not added enough oil. it holds about 40 ounces.<br /> the vent on your drive is about 3 inches below the top of the housing. the drain is at the bottom forward on the lower. fill slowly from the bottom till it oozes out the top.<br /> buy the 6 dollar qt bottle pump from wally world. it works great. replace the drain and fill gaskets as well.<br /> good luck and keep posting

 

[DHPMARINE]

Re: 1983 Merc 120: Oil Vent Location?

BarryBob, The "newer" Merc owners have outboards if the top plug is no more than 10" above the drain plug.<br />Mercruiser 120/140 drives are about 33 or 34 inches tall.Drain is in the front lower side of the "bullet" or "torpedo".Fill from there until gearlube comes out the upper plug,about 3 inches below the top of the drive (as previously answered)<br />DHP