LeadTurn_SD
Contributor
DIY Brothers,
Much to my surprise, an eBay Scubapro Mk10 transformed into a Mk5 while in the mail. In my defense, it was listed as a Mk10, and the auction pictures were a little blurry and end-on, not profile… it is in really great shape (spotless, near-new appearance)... To to my embarassment, I only discovered it was not a Mk10 when I began to tear it appart while glancing at couv's wonderful annotated Mk10 diagram (thanks couv!!)... scratched my head, then looked at couv's Mk5 diagram and went "Ah-ha"! Sheesh....
Anyway, I have some questions for the Mk5 gurus. First, please confirm that this is a Mk5 (see picture), then:
1. It appears there are variations in the seat used in the Mk5 (flat and concave), mine is a flat white “puck” type (see picture) below. Were there also different pistons for the Mk5?
2. Have any of you EVER seen the spring painted? Were they color-coded? This spring looks like it had a red stripe spray painted on…? (See picture). Or was this something the last owner did??? Strange….
Initial testing showed a good, quick lockup, no creep, but at a too-high IP of 150 psi. There are no shims.
Based on a sticker on the yolk, the reg was probably last serviced in December 2004.
3. Could the stable, but too-high IP be caused by the lube on the o-rings breaking down (the remaining lube did look pretty “goopy”. I also saw red paint flecks on the piston knife edge, and suspect this might also cause it to lockup at a higher IP…
Thanks in advance for the advice.
Best wishes.
Much to my surprise, an eBay Scubapro Mk10 transformed into a Mk5 while in the mail. In my defense, it was listed as a Mk10, and the auction pictures were a little blurry and end-on, not profile… it is in really great shape (spotless, near-new appearance)... To to my embarassment, I only discovered it was not a Mk10 when I began to tear it appart while glancing at couv's wonderful annotated Mk10 diagram (thanks couv!!)... scratched my head, then looked at couv's Mk5 diagram and went "Ah-ha"! Sheesh....
Anyway, I have some questions for the Mk5 gurus. First, please confirm that this is a Mk5 (see picture), then:
1. It appears there are variations in the seat used in the Mk5 (flat and concave), mine is a flat white “puck” type (see picture) below. Were there also different pistons for the Mk5?
2. Have any of you EVER seen the spring painted? Were they color-coded? This spring looks like it had a red stripe spray painted on…? (See picture). Or was this something the last owner did??? Strange….
Initial testing showed a good, quick lockup, no creep, but at a too-high IP of 150 psi. There are no shims.
Based on a sticker on the yolk, the reg was probably last serviced in December 2004.
3. Could the stable, but too-high IP be caused by the lube on the o-rings breaking down (the remaining lube did look pretty “goopy”. I also saw red paint flecks on the piston knife edge, and suspect this might also cause it to lockup at a higher IP…
Thanks in advance for the advice.
Best wishes.
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