How do I do a pressure test to see where outdrive is leaking?

[natispotatis]

Hi, I have an 3.0 litre '85 OMC Stringer Sterndrive and I noticed the oil was milky when I checked the level on the dipstick (on top of the outdrive when in down position). I've read some threads about doing a "pressure test" to see where the leak might be coming from. How do I perform this test? Do I simply unscrew the fill screw and stick a blower attachment from my air compressor in there and shoot some air in? Do I have someone squirt some soapy water around the other two screws to see if it's leaking there?

 

[Nivekt]

Re: How do I do a pressure test to see where outdrive is leaking?

Hi, I have an 3.0 litre '85 OMC Stringer Sterndrive and I noticed the oil was milky when I checked the level on the dipstick (on top of the outdrive when in down position). I've read some threads about doing a "pressure test" to see where the leak might be coming from. How do I perform this test? Do I simply unscrew the fill screw and stick a blower attachment from my air compressor in there and shoot some air in? Do I have someone squirt some soapy water around the other two screws to see if it's leaking there?

The best way is to build your own. Check this video to see how this guy did it: http://www.youtube.com/watch?v=t5JHNy53uk0

And then check my post #4 on this thread for more info: http://forums.iboats.com/showthread.php?t=563132&p=3866949#post3866949

The only reliable way is to remove the drive and then pump it with air, submerge drive in water and check for the air escaping. If you are going to go through the trouble of removing the drive, you might as well just buy a new upper seal kit.