Motor Bulkhead/Cylinder Union Leak

[He Who Shall Not Be Named]

Hi all, after inability to negate the leak, Bob offered to take a look at it. I also had him ship back a new mini pump as the original rusted from the leak and was no longer functioning. Bob applied 2 Teflon wraps and a new O Ring, water testing was successful. I am now swapping the pumps. I did not realize the new pump did not include the outer board where power and servo is connected. Pain the butt, but it is working. My question is I assume I need to drill the two holes in the new pump which are present in the old pump? I assume thats how the pump gets air from within the cylinder to blow ballast?

Back a few years ago the producer of those pumps tightened their QA and they stopped leaking past the pump proper. Those holes were weep-holes to carry away water from a leaking pump body. No longer needed on the improved product. Don't sweat it.

David

[biggsgolf]

Hi all, after inability to negate the leak, Bob offered to take a look at it. I also had him ship back a new mini pump as the original rusted from the leak and was no longer functioning. Bob applied 2 Teflon wraps and a new O Ring, water testing was successful. I am now swapping the pumps. I did not realize the new pump did not include the outer board where power and servo is connected. Pain the butt, but it is working. My question is I assume I need to drill the two holes in the new pump which are present in the old pump? I assume thats how the pump gets air from within the cylinder to blow ballast?

[biggsgolf]

There are no cracks, I wrapped teflon tape around the encap, inspected the new O Ring, silicone greased the O Ring, Installed the O Ring into the channel. Still getting a small leak thru the O Ring...... what are my options? Getting tired of this constant issue.

[biggsgolf]

[biggsgolf]

Can anyone confirm the size O Ring is as pictured below? I replaced the original O Ring in may

[biggsgolf]

Thanks Trout, Dave I will examine closely upon return to home base.

[trout]

Thanks Tom, so you put the teflon under the O Ring?

Yes. From your video, It looks to me that your assessment that the air is getting past the o-ring is correct. If your o-ring does not have any nick or cuts in it and it did seal originally, it might be the resin shrank just a little and now the seal is not being made. Wrapping 4 - 5 times around the bulkhead o-ring channel with Teflon tape should tighten up that seal. Do not forget to re-grease your o-ring with silicon.

[He Who Shall Not Be Named]

And on the inside of tube

shallow scratches the O-ring can handle. Are you confident they are not fractures the extend to the outside of the cylinder? Look at these 'scratches' from all angles with a bright, single light source -- refraction will tell you if its a crack or scratch.

David

[biggsgolf]

And on the inside of tube

[biggsgolf]

There are a couple scratches that I can feel while running a flat blade across them and yes they extend across the O Ring.

[He Who Shall Not Be Named]

Dave, sorry, yes the O Ring seems to have a thin black bead all the way around, I was confused

The video was useful. Yes, looks to be loose. But, again -- look at the cylinder over the O-ring: are there any cracks?

David

[biggsgolf]

Dave, sorry, yes the O Ring seems to have a thin black bead all the way around, I was confused

[biggsgolf]

Here is leak video uploaded to youtube

https://youtu.be/imxrHgfJsTM

[biggsgolf]

Hahaha, one of my most favorite quotes!

[He Who Shall Not Be Named]

Guys, just occured to me I should call it the motor housing cap, not bulkhead?

Motor bulkhead, damnit!... motor bulkhead!

https://youtu.be/3bQnxlHZsjY