Scubapro Mk5 old 2 LP turret

[mick allein III]

All I just got the necessary tools and service kit for the SP MK 5. I'm looking to clean and service it. Eventually I want to use in my pony.

Any advice on doing this. Anything in particular I should be looking out for?


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[SeaCobra]

As I recall, one thing to watch for is on some of the older ones that only had 2 lp ports, the swivel was held in place by a clip. This clip could wear over time and I think the recommendation is to replace the swivel with a new one.

 

[redacted]

Older Mk5s can be a problem. It can be very hard to find 4LP or 5LP port turrets if 2 is not enough (or you can add an extender. They usually have the light yoke which may not handle 3000psi but that can be replaced. They also usually have a single 3/8" HP port which may require an adapter to accept a modern HP hose. When I purchase one of these, I will not pay more than about $10 and then put it in my spare parts bin.

If you are looking for a good pony regulator, you would probably be better off with a Mk2/3/200 from a reliability, weight and hose routing standpoint. You still need to watch the yoke and size of the HP port. They are not too hard to find and usually a little cheaper than a good Mk5.

 

[mick allein III]

Awap this is very helpful. I had read about the yoke thing. Can you explain this further? What happens to the MK5 when on 3000psi? How would I know if I have a light yoke? I'm assuming the MK5 is a later model than MK 2. Did the MK2 have the same yoke problem? I'd send you pictures but I'm out of town.


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[redacted]

Awap this is very helpful. I had read about the yoke thing. Can you explain this further? What happens to the MK5 when on 3000psi? How would I know if I have a light yoke? I'm assuming the MK5 is a later model than MK 2. Did the MK2 have the same yoke problem? I'd send you pictures but I'm out of town.


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Over time, Scubapro produced 3 yokes. Early production was a light yoke with 3/8ths inch screw. Tank pressures then were less than 2500 psi. Some folks still use that yoke on 3000 psi tanks but I doubt it will handle much more. The problem is the yoke frame may distort resulting in a leak.

Then there is an intermediate yoke with a 7/16th inch yoke screw. It is about the same shape but b bit heavier. The base of this yoke is stamped with "3000". Scubapro says it should not be used above 2475 psi but I still use mine on a 3000 psi pony.

This is a pic of the intermediate version: Scubapro Mark V MK5 109 Brass Pressure Gauge Vintage Tech Wreck Regulator | eBay

This is the light version: Scuba Diving Regulator Scubapro MK5 Just Serviced Nice Read Details | eBay

And the heavy version: Scuba Diving Regulator Scubapro MK5 Just Serviced Late Model Read Details | eBay

The Mk2 and Mk3 went through the same evolution.

 

[mick allein III]

Thanks. Very helpful


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[NotSure]

Early two port MK5's had a clip retaining the turret and later ones had the same turret bolt as all later MK5 versions. If your regulator is the E-clip version make sure you reinstall the clip with the sharp edge of the clip facing the balance chamber.