Alpha 1 gearcase pressure test / vacuum test

[lenny2113]

After replacing water pump impeller, I pressure tested gearcase by pumping air into it through the vent screw openning. It held 15psi for 24 hours. So, I think it's fine. <br /><br />Question: Is vacuum test important? If someone could, please explain why should I do both - vacuum test and pressure test???<br />Thank you. <br /><br />Happy 2004 Boating year to all, <br /><br />Lenny

 

[rattana]

Re: Alpha 1 gearcase pressure test / vacuum test

I would think that pressure test pushs the seals in one direction, the vacuum test pulls the seals in the other direction.

 

[crazy charlie]

Re: Alpha 1 gearcase pressure test / vacuum test

Do both tests Len.Pressure will let you know if it will leak and vacuum will let you know if it will suck up water if it does leak.Charlie

 

[lenny2113]

Re: Alpha 1 gearcase pressure test / vacuum test

Thanks for the info. <br />I did pressure test myself. <br />How do I do vacuume test? Is there a gauge and a vacuume tool to use? <br /><br />Lenny

 

[lenny2113]

Re: Alpha 1 gearcase pressure test / vacuum test

I mean vacuum

 

[OBJ]

Re: Alpha 1 gearcase pressure test / vacuum test

Lenny....I got a cheap little auto A/C vacuum tester from NAPA that works just fine. Gauge is built right in. All you need to do is fit a threaded fitting to the hose so it will screw snuggly into the vent hole.