Scubapro mk10 piston wall damage.

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p_kos

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I have polished a similarly “pitted” MK20 with the @rsingler recommended micromesh (few minutes spinning it around in there with a finger) and it came out perfectly smooth and works without leaks. I have also assembled a couple regs with the same level of wear without polishing and they too work just fine. Without polishing, even if it works fine, I suppose the oring may be prone to failing sooner running over a rougher surface but I have no long-term data/experience to confirm this.
 

rhwestfall

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I've got a mk-20 with a bit of crud on the wall. It seems to have some drift. Wondering if it is the cause. Need time to work on it...
 

Can't Talk ... Diving

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I've got a mk-20 with a bit of crud on the wall. It seems to have some drift. Wondering if it is the cause. Need time to work on it..
Pretty sure drift/creep is related to the HP seat and the piston edge. The wall damage would let air pass by the main piston o-ring and bubble out of the body. Easily evident.

Drift isnt uncommon with SP pistons - not a huge deal if they lock up reliably.
 
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Tr4lover

Tr4lover

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Got the 108hp all ready for Mexico this weekend.
 

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