Madbull XMPB4 maintenance

[slink182]

One of my shells developed a leak. After reading some and piecing the various maintenance discussions together, I think I have an order of operation, but just want to make certain. If folks can correct me when/where I'm wrong, that would be great.

I assume I will require some 15-20 wt silicon oil and maybe a few dabs of ultralube.

1) Remove the fill valve and unscrew the "shell" from the "base". Separate the o-rings out.
2) Remove the firing pin assembly, setting aside pin, spring, 4 bearings and lock valve (sorry, don't know the actual name). Again, separate the o-rings out.
3) Inspect o-rings for tears and replace if necessary. I don't know if a warped o-ring needs to be replaced.
4) Soak the o-rings in silicon oil for several hours (1, 2, 6, 12, 24? not sure).
5) Remount o-rings. Small dab of ultralube/silicon grease on the bearings (?) and set back into the lock valve. Save oil for future soakings.
6) Reverse assembly. Perform gas seal check (shell in a ziplock bag looking for bag inflation).

Am I doing this right?

Thanks in advance.

[coach]

Originally Posted by slink182

One of my shells developed a leak. After reading some and piecing the various maintenance discussions together, I think I have an order of operation, but just want to make certain. If folks can correct me when/where I'm wrong, that would be great.

I assume I will require some 15-20 wt silicon oil and maybe a few dabs of ultralube.

1) Remove the fill valve and unscrew the "shell" from the "base". Separate the o-rings out.
2) Remove the firing pin assembly, setting aside pin, spring, 4 bearings and lock valve (sorry, don't know the actual name). Again, separate the o-rings out.
3) Inspect o-rings for tears and replace if necessary. I don't know if a warped o-ring needs to be replaced.
4) Soak the o-rings in silicon oil for several hours (1, 2, 6, 12, 24? not sure).
5) Remount o-rings. Small dab of ultralube/silicon grease on the bearings (?) and set back into the lock valve. Save oil for future soakings.
6) Reverse assembly. Perform gas seal check (shell in a ziplock bag looking for bag inflation).

Am I doing this right?

Thanks in advance.

- Don't remove the fill valve unless it's leaking. The stock ones tend to break when manipulated too much. They are fine if you leave it alone.
- you don't need to remove the oring from the valve unless you notice damage and need to replace it. A drop of oil on it is all you need. Use your finger to spread it around.
- only time I replace the oring is when there is physical damage. Warped or out of round when removed is fine. key is that it looks right when installed.
- don't need to soak them just rehydrate them. Soaking them will cause them to become engorged and potentially become damaged when you fire the made as it will be too large.
- use something like sticky G oring grease to hold the bearings in place.

Ziplock? Sheesh, just use your ears. If CO2 is going to leak, you will know.

[slink182]

Coach, thanks for the corrections. 'Nade is back together and holding gas.