Can a pressure test be performed on an Alpha 1 Gen II while it’s still on the boat

Rick Stephens

Admiral
Joined
Aug 13, 2013
Messages
6,118
Merc engineers were *brilliant* when they did away with the spring loaded method and went with a fixed lash. Needs more tools to set up properly but is mechanically much more reliable.
 

Skidude17

Petty Officer 1st Class
Joined
Jul 10, 2014
Messages
225
I’ve got the 2 halves back together. I put 10 psi of pressure on the drive last night. After 10 minutes and with spinning prop shaft and changing gears no change. After 12 hours I had 5 psi. I’ve checked through the exhaust opening with soapy water, and where the oil path goes between the drives. Where else should I be looking?
 

alldodge

Moderator
Staff member
Joined
Mar 8, 2009
Messages
42,591
There might not be a problem, temps change at night. Could also be the gauge and/or fittings used may have the leak. That said I've never let one sit all night, after an hour I'm good and fill it back up.

How did the vacuum check out?
 

Rick Stephens

Admiral
Joined
Aug 13, 2013
Messages
6,118
There might not be a problem, temps change at night. Could also be the gauge and/or fittings used may have the leak. That said I've never let one sit all night, after an hour I'm good and fill it back up.

How did the vacuum check out?

Agree. Hour or two, golden.
 

Skidude17

Petty Officer 1st Class
Joined
Jul 10, 2014
Messages
225
I’m doing the vacuum right now. I was waiting to figure out the pressure test first.
 

achris

More fish than mountain goat
Joined
May 19, 2004
Messages
27,468
Pressure and vacuum test only need to be held for 15 minutes. Any longer than an hour and you're going to get 'false failures'...Like you have.

Chris.....
 

Skidude17

Petty Officer 1st Class
Joined
Jul 10, 2014
Messages
225
Pressure and vacuum test only need to be held for 15 minutes. Any longer than an hour and you're going to get 'false failures'...Like you have.

Chris.....

Good to know. Thanks for all the help everybody! I’ll be filling the drive and putting it back on tonight.
 
Top