Complete ScubaPro MK2/R190/R380 Repair Steps/Parts List...

[Zung]

All yokes are a bit loose, and the dust caps somewhat make them feel a bit sturdier. Once pressurized, it should be OK.

The washers should be replaced. I use originals that somehow appear by magic in my stash, but there's no good reason why you couldn't make them yourself out of plastic packaging material. Check your local supermarket and indulge yourself with some candies or pies.

The IP is a bit low. I'd rather see it at 140 with a full tank, dropping to maybe 120 when empty. Fix the washers, let it settle for a day with air on and re-test.

 

[ams511]

All yokes are a bit loose, and the dust caps somewhat make them feel a bit sturdier. Once pressurized, it should be OK.

The washers should be replaced. I use originals that somehow appear by magic in my stash, but there's no good reason why you couldn't make them yourself out of plastic packaging material. Check your local supermarket and indulge yourself with some candies or pies.

The IP is a bit low. I'd rather see it at 140 with a full tank, dropping to maybe 120 when empty. Fix the washers, let it settle for a day with air on and re-test.

Thanks for the reply. I do have other regs to check this against but it does seem loose. Because it was an eBay regulator and my parts schematic was old, so I did not know if perhaps there was a part missing. I will check the PSI in the tank, I think it is around 1,000 PSI. I can redo the check on a full tank.

---------- Post added March 16th, 2013 at 12:35 PM ----------

All yokes are a bit loose, and the dust caps somewhat make them feel a bit sturdier. Once pressurized, it should be OK.

The washers should be replaced. I use originals that somehow appear by magic in my stash, but there's no good reason why you couldn't make them yourself out of plastic packaging material. Check your local supermarket and indulge yourself with some candies or pies.

The IP is a bit low. I'd rather see it at 140 with a full tank, dropping to maybe 120 when empty. Fix the washers, let it settle for a day with air on and re-test.

Thanks for the reply. I do have other regs to check this against and it does seem a bit loose. Because it was an eBay regulator and my parts schematic was old, so I did not know if perhaps there was a part missing. The dust cap does not fit the body of the regulator properly, It could be din cap. I will check the PSI in the tank, I think it is around 1,000 PSI. I can redo the check on a full tank.

 

[Couv]

Hi AMS, the washer you mention that is broken, do you mean washer part number 01060101? It is actually a spring shim used to increase the IP. It is the same p/n as the MK 5/6/7/9/10 etc.

Re the loose yoke, as Brother Zung pointed out they do tend to be rather loose, but some of the newer model diagrams (i.e. MK 2 Plus) also show a spacer, part number 10044021, between the yoke and body.

As the MK 2 is an unbalanced piston the IP will be affected by tank pressure. (lower tank pressure=lower IP) Per the 2003 SCUBAPRO MK 2 Plus First Stage Repair Guide: "Intermediate pressure should be 125psi – 145psi at 3000psi and 300psi supply pressure."

 

[ams511]

Yes Couv, I am talking about part number 01060101, the parts schematics call it a "washer". Would a Mk 5/10 kit have these washers included? I am not home at the moment so I cannot check.

As mentioned , the reg appears to be a current model MK-2+ (shiny rather than matte chrome). It does have a spacer (part #8) between the yoke and the body. The parts schematic and the repair manual are vague (and out of date) so it is hard for me to tell the proper assembly. However the spacer is smooth on one side and has ridges or "teeth" on the other. The teeth point down, so I assume they should grip the dust cap. However, the dust cap is rather beat up and I am not sure if it is correct part. This was a beat-up eBay reg so I am not sure that it was assembled correctly (it did work though) when I received it.

If I had to guess I would estimate the tank had less than 1000 PSI in it. I will check the IP pressure using a full tank when I get home. Again I am not 100% sure my gauge is accurate. I probably should have invested in a better IP gauge.

This was my first attempt at rebuilding a regulator and I am fairly satisfied with the results. Next step is a MK-5. Thanks to both of you for your help.

 

[halocline]

If the IP was about 125 PSI at less than 1000 PSI supply pressure, it's about right. The MK5 washers are bigger I believe, the MK10 washers might fit perfectly, but they do not come in the rebuild kits.

 

[Couv]

......The MK5 washers are bigger I believe, the MK10 washers might fit perfectly, but they do not come in the rebuild kits.

Darn professors-always giving me more research.

The MK 5, MK 10 & MK 2 all use the same IP spring shim p/n 01-060-101, however the MK 2 Plus also has an additional washer that goes on the piston head side of the spring p/n 01-060-104. An older version of the MK 2 (not Plus) diagram dated 12/97, shows the same shim p/n 01-060-101 on both sides of the spring.

A few moons ago I mic'd all of my spare spring shims. Due to use, there was a slight thickness range from .010 to .015 inches. If you want to kill yourself modifying life support equipment, you could probably get plastic or Teflon shim stock from McMaster Carr and make your own. http://www.mcmaster.com/#ptfe-flat-washers/=lx0o22

But if you do that and get bent so badly that you lose use of both of your legs, don't come running to us for help.....you've been told.

 

[halocline]

I know I've seen two different size washers. Maybe one of them was not a SP part. Maybe the other size is for the MK15/20/25.

---------- Post added March 17th, 2013 at 08:23 AM ----------

But if you do that and get bent so badly that you lose use of both of your legs, don't come running to us for help.....you've been told.

Good one!

I looked up numbers, the MK15 washer is 01 060 218 and the MK 20/25 is 01 060 219. So those must be the different sized ones.

 

[ams511]

If the IP was about 125 PSI at less than 1000 PSI supply pressure, it's about right. The MK5 washers are bigger I believe, the MK10 washers might fit perfectly, but they do not come in the rebuild kits.

The IP is 120 or so on a tank with 500 psi of air and 135ish on a tank with 3000 psi of air. I used the "ish" because after a breath it settles at 135 or so but has a 3-5 psi creep which I assume is do to the regulator not being completely cycled.

I am cruising the Aldi looking for imported Swiss cakes and candies packaged in shim stock, but alias, I cannot seem to find any.

 

[halocline]

The IP is 120 or so on a tank with 500 psi of air and 135ish on a tank with 3000 psi of air. I used the "ish" because after a breath it settles at 135 or so but has a 3-5 psi creep which I assume is do to the regulator not being completely cycled.

I am cruising the Aldi looking for imported Swiss cakes and candies packaged in shim stock, but alias, I cannot seem to find any.

That's a little low, but it'll work. One shim would bump it up about 5-7 PSI which would put it right in the best range for a MK2.

Oh yeah, I've been meaning to mention this, but IMO the SP shims are nothing to write home about. A harder plastic or even SS shim of an appropriate size might be perfect.

 

[Zung]

... I am cruising the Aldi looking for imported Swiss cakes and candies packaged in shim stock, but alias, I cannot seem to find any.

Support America, buy domestic!
Another possible source is the transparent plastic "box" Samsung used to package their harddisks with, but of course, that's imported too.
Go thru your junk box: the plastic cover for the current SP service kits is about .26mm and should work as well.