Pressure Testing HPDI lower unit

[WWDIII]

I have a 300 HPDI, I am planning on taking my lower unit off and sending to HydoTech to have some work done to get my water pressure up. While I have it off I am going to replace my water pump and reseal.

Last time I change my lower unit lube, the lube was mikly, drain plug was hand tight. Not sure if I have a bad seal or if the guy that replaced my prop shaft didnt tighten it drain plug. I will drain it this weekend and see what I have. Just want to make sure I do not have a leak, if I do its very small.

I swear its getting to the point if you want someing done you do it yourself.

I donot have a service manual, but will get one.

Do you pressure test with prop on or prop off, I would think off.

I figure I can use a brake bleeder, I have a fitting that screws in the bottom drain. I've read where you pressure test at 14.2 pounds.

comments.

[Charlie206]

I test at 3 lb and see if it holds. Prop on or off shouldn't matter.

[Neilslure]

I would think if your plug was loose thats probably where you got your water from. I would change the fluid and check it again after a few trips to the lake.

[WWDIII]

I'm hoping when I check it this weekend it didnt leak. As loose as the drain plug was I would have thought it would have leaked lower unit lube, but it didnt, or at least if it did I didnt notice.

[toledo freak]

does not matter with prop? and you screw the tester into the top hole and pressure to 12lbs

[WWDIII]

How long should it hold on the leak down test.

Thanks, Billy