OMC Cobra Outdrive

[Blackbirdtrev]

I have an OMC Cobra 3.0l engine and matching outdrive. I have changed the circ water tube on the leg and have changed the oil in the top gearbox. The problem is there is no drain plug or filler / level plug on the lower gearcase? How can i change the oil or does the bottom drive shaft run dry? I have been a marine engineer for 38 years and have never come across a lower gearcase on either an out drive or outboard without a drain plug. Am i missing something? Thanks.

 

[211libwtfo]

What year.

 

[Scott Danforth]

from the stickies https://forums.iboats.com/forum/eng...oard-engines-outdrives/342742-omc-information

 

[Blackbirdtrev]

I could not find out what year on the leg it has got Mod No 985684 and Serial No T0631213 but could not find out from these the year or anything. Help Needed.

 

[Blackbirdtrev]

from the stickies https://forums.iboats.com/forum/eng...oard-engines-outdrives/342742-omc-information

Like i said the lower gearcase does not have the drain and fill plugs. I say again i have been a marine engineer for almost 40 years and i know where the drain plug and fill plugs should be on a leg and an outboard. But let me repeat there is not drain or fill plug on the lower gearcase of this OMC Outdrive.

 

[Lou C]

Well I don't know what you have but that is not right at all. Maybe the drain and fill plugs have been painted over so many times you can't see em. The OMC Cobra has a drain plug on the lower fwd starboard side of the lower unit and the fill plug also on the starboard fwd side is up by the upper edge of the lower unit. There is no 'upper' or 'lower' reservoir for gear oil, it flows between the 2. And if you don't put enough in, you will toast the upper gears for sure. Most take a bit more than 2 qts.

http://www.crowleymarine.com/support/tech_articles/omc-cobra-outdrive-lubricant-filling.html

 

[Blackbirdtrev]

Well I don't know what you have but that is not right at all. Maybe the drain and fill plugs have been painted over so many times you can't see em. The OMC Cobra has a drain plug on the lower fwd starboard side of the lower unit and the fill plug also on the starboard fwd side is up by the upper edge of the lower unit. There is no 'upper' or 'lower' reservoir for gear oil, it flows between the 2. And if you don't put enough in, you will toast the upper gears for sure. Most take a bit more than 2 qts.

http://www.crowleymarine.com/support...t-filling.html

I agree. I cannot think of any outboard or leg that has no fill or drain plug but believe me this has neither. Will get photo tomorrow if i get chance. Its a real misnomer. I have had a scratch about where they are meant to be and defo not painted over. I sucked the oil out of the top g/box today and cannot find anyway that the oil would get from there to the bottom onless it goes down under the gearwheel. Its hard to see from a schematic.

 

[Scott Danforth]

the Volvo legs have the drain behind the prop forcing you to pull the prop for anode inspection, spline grease and seal inspection.

 

[Blackbirdtrev]

the Volvo legs have the drain behind the prop forcing you to pull the prop for anode inspection, spline grease and seal inspection.[/QUOT
The drain plug on the Volvo dp280, dp290 and the sx and any other volvo out drive i have worked on are all on the side the lower gearcase.

 

[Blackbirdtrev]

https://www.youtube.com/watch?v=_QgZ3BH-rHA

 

[Scott Danforth]

the Volvo legs have the drain behind the prop forcing you to pull the prop for anode inspection, spline grease and seal inspection.[/QUOT
The drain plug on the Volvo dp280, dp290 and the sx and any other volvo out drive i have worked on are all on the side the lower gearcase.

the DP-S drives have the drain behind the prop. different than the SX and old AQ series.

 

[Lou C]

Post a pic of what you got, I can't wait to see a Cobra with no drain/fill plugs!

 

[HT32BSX115]

Post a pic of what you got, I can't wait to see a Cobra with no drain/fill plugs!

Must be the secret Prototype: "No Oil Change for Lifetime" drive then?