Sherwood Reg Help

[Jonny Wishbone]

Hey Guys, working on a Sherwood Oaisis (SRB 7700) for a family member. I need to obtain some of the "spring shims" to raise intermediate pressure. It already has the maximum of 3 shims which are the pink ones. Im not sure which colors are thicker than the pink ones but I am in search of some if anyone has some they would sell or direct me to where I can buy them. Already looked on ebay...Thanks and have a great Dive...

 

[Ghetto Diver]

What is the IP at now?
I have diy'ed shims using SS washers or plastic washers from hardware store.
If you have access to other springs, swap one out and see what happens. Older springs will sag.

 

[Jonny Wishbone]

Hey Getto Diver, yeah the hardware store was plan B. I always strive to use the correct stuff at least at first. Im working on 2 identical regs and both show the same IP. The IP is supposed to be 135 to 150 psi. I have a liquid filled higher end gauge that I use for IP which shows the regs are between 130 and 135. Even though I have a higher end gauge, I know that there is a little room for slight inaccuracy. I just want to put them both at 140 and call it good. They were not exhibiting any symptoms but it was time to go through them to clean and lube.

 

[fmerkel]

Personally I would not sweat 130-135. Should work fine. Just tune the 2nd stage to work with it.

 

[divezonescuba]

McMaster-Carr for stainless shims. Worked for an Sr1, your dimensions may be different, so you would have to check sizes.

McMaster-Carr

 

[ams511]

The IP is supposed to be 135 to 150 psi. I have a liquid filled higher end gauge that I use for IP which shows the regs are between 130 and 135.

In general, the IP of a first stage is supposed to be set at 135 +/- 15 PSI, this would be a range between 120 - 150 PSI. Your regs are right where they should be at. If the second stages are properly tuned to the first stage the breathing performance is fine.

 

[Jonny Wishbone]

yeah thats what i sorta figured. the service manual does say 135 to 150 so I figured I'd just put em in the middle and go.I'll tune what I have and see what they are like. Like I said earlier, there were no issues or symptoms, it was just time to go through them to clean/lube.....Thanks Guys

 

[KeithG]

yeah thats what i sorta figured. the service manual does say 135 to 150 so I figured I'd just put em in the middle and go.I'll tune what I have and see what they are like. Like I said earlier, there were no issues or symptoms, it was just time to go through them to clean/lube.....Thanks Guys

This is newer than my regs, but my service manuals says no more than 3 shims. It does not explain why.

I also do not think that 2 thicker shims will meet the intention.

Maybe at 3 standard shims the spring is now considered out of limits and needs to be replaced?