This DC submersible motor safe?

This is a DC submersible motor. I used it couple of times years ago and it had been unused since then. I need to use it again for a sprinkler project. When I took it out of my almirah today, I discovered this long crack on the motor's body. Do you think it is safe to use this motor anymore?

It's only low voltage, so not a safety issue - but presumably the crack means water will get inside, where it's not supposed to, and the motor will probably die after a while.

In short term, the motor may be water cooled - but that is not of any advantage unless it's feed with more than rated power.
In longer term - even if the housing isn't submerged, it seems to be open for dust getting in to the motor itself - that of course being depended on the environment where you plan to put it to use.

[edit]
Wait a minute! You said "sprinkler project" - as in fire extinguisher system ??

Well, in that case - no f... way I'd agreed to use components holding that low of a standard. You need a system that you can actually trust, this motor at the picture can fail at any moment.

After well dried, wrap in many turns of tight vinyl insulating tape and test. It is broken, cannot break it more. If works for a while, great.

Wrap if gkass cloth, and then coat with fibreglass resin as used in covering water craft etc.

You can sacrifice a soldering iron tip or wood burner tip or, if you have an iron nail and a candle or torch, you can thermal stake it. Just drag (poke) your soldering iron or nail across good area and into the crack. Poke into the crack first, (blue arrows) if the resin melts reasonably well - then do the crisis-cross as in second photo.