A vacuum test is also needed; unit will never see 30 psi inside, in service, (but it will see a vacuum as it is cooling off,immersed in the water, that is also when water gets in); 15 psi max is recommended for testing, too much pressure may damage the seals lip.
Thats good information. I'm always open for learning. Thanks for your input 30psi will force a failure correct. Weakest link will be exposed. We do have a vacuum tester and I will implement it from here on out. Thanks again 👍
@@hotheadzmarine i would not worry about that air leak on top at 20 psi, it lies inside the bellows where no water can get in; that seal is designed to not seal totally,in order to allow some retraction from the top after the air inside expanded from heat, and avoid water getting in from some of the bottom seals; if it sealed totally, it would overheat and destroy the lip,that top is out of the water and it gets REALLY hot at speed,burns your hand; some use (i do) drive showers on top
do you have a video on how you replaced the driveshaft seals? I replaced the two upper seals on my gen 2, but air gushes out when trying to pressure test.
@@hotheadzmarine the seals that came in my kit were double lipped and not the same as the original ones. I ordered the OEM ones and installed them with no problem.
Could u tell me what would cause gear oil to fill up inside here? Pulled it to replace the u joints and about half a quart of gear oil came out with it.
Oil was in the bellows? U joint bellows? If so upper gear box drive shaft seal is bad and shaft seal area may be pitted as well. If your bellows has been or is bad and water has intruded it will rust the shaft and the seal will fail
This job was combined and I do not have access to the records but 3-500 for a reseal job on an alpha is reasonable these days. Dealers charge WAY MORE...
I had this same seal blow out on my dad's 1975 mercruiser. The drive would not even hold any pressure at all. My only question is I don't see how this seal would instantly contaminate the gear oil just by running it a minute. Unless it was ran in the water and the failed bellows was filling that cavity and letting water in? That is exactly what my dad's boat was doing but it took a few outings to show any water contamination.
