- Messages
- 17,535
- Reaction score
- 9,781
- Location
- Somewhere between here and there
- # of dives
- 2500 - 4999
Then I will add some to my order.
Scubapro G250 can't be serviced??
- Thread starter SlyStrat
- Start date
Please register or login
Welcome to ScubaBoard, the world's largest scuba diving community. Registration is not required to read the forums, but we encourage you to join. Joining has its benefits and enables you to participate in the discussions.
Benefits of registering include
- Ability to post and comment on topics and discussions.
- A Free photo gallery to share your dive photos with the world.
- You can make this box go away
Then I will add some to my order.
- Messages
- 17,535
- Reaction score
- 9,781
- Location
- Somewhere between here and there
- # of dives
- 2500 - 4999
I've encountered the odd G250 that has given me trouble, gremlins.
- Messages
- 17,535
- Reaction score
- 9,781
- Location
- Somewhere between here and there
- # of dives
- 2500 - 4999
The only real "flaw" in the G250/V/156 you are at the mercy of getting within range of just the right specs/tolerances on all parts or you can have trouble.
Would you say your uncompressed spring is approximately 26mm in length?So, I switched balance chambers to see what the difference in minimum cracking effort was (knob fully out position). The difference in base height as measured by @Open Ocean Diver was 0.024"/0.6mm. That's less than a half turn on the knob. I started with the old style, shorter base chamber and a cracking effort of 1.05". Sure enough, when I put the taller base balance chamber in my G250, the min cracking effort went from 1.05" to 1.12" measured with the precision cracking effort pump. It all makes sense, if not really significant. On the other hand, I'd rather be able to get 1" min on my G250 than 1.1", so there's that.
As for which balance chamber clears the wiper o-ring, here's a picture:
View attachment 651929
As you can see, in my reg, there's 79.5mm clearance from the knife edge of the orifice to the locking pin hole in the barrel.
When the pieces are set out at that distance with the old balance chamber, the wiper o-ring is just inside the crown, and thus performing its function. More surprising is the amount of compression on that poppet spring. It's fully 1/3 compressed in its least compressed position.
My conclusion? For the G250 at least, it doesn't matter which balance chamber you use, unless you want below spec cracking effort (which I do).
One of these days I'll take a look at the G260...
About. My bag of used ones varies.
That might explain that low cracking effort...
I'd put it on the BC side. There's a little more room to have the spring stay centered.
Not much room here...
Similar threads
