ScubaPro Mk2-- Black mushroom shim under spring- Is this just an IP shim?

[beanojones]

ScubaPro Mk2-- Black mushroom shim under spring- Is this just an IP shim?

It seems like some have them and some don't and they do not seem to appear in schematics.


Any insight from an SP god?

 

[redacted]

It looks like it is part of the T.I.S. on Mk2 Plus. First Stage

Click on name below the Mk2 Plus picture and you will get a schematic. Note that the spring is different also.

 

[Zung]

I think it's there to keep the spring from moving about. I've got a MK5 with a bottom shim that's completely torn and chewn.

 

[beanojones]

It looks like it is part of the T.I.S. on Mk2 Plus. First Stage

Click on name below the Mk2 Plus picture and you will get a schematic. Note that the spring is different also.

Thanks for that.

Do you know what difference there are with the spring?

 

[redacted]

Thanks for that.

Do you know what difference there are with the spring?

I just noticed the different part numbers for the springs but the pistons are the same. That TIS piston has to be a bit shorter.

 

[beanojones]

Well a vinegar soak just proved to me that the TIS spring is coated with something that reacted to vinegar.

 

[redacted]

Well a vinegar soak just proved to me that the TIS spring is coated with something that reacted to vinegar.

I guess that means that for now on it will have to have the good sense to stay out of cold water.

 

[beanojones]

It also made it really easy to remember which spring was which, since I am rebuilding one TIS and one not TIS apparently.

I just noticed the different part numbers for the springs but the pistons are the same. That TIS piston has to be a bit shorter.

I am a little confused about that. The pistons are the same AFAICT. Why do you think the TIS piston would need to be shorter?

EDIT: That sounds like I am doubting you, but I got these mk2's used and it is entirely possible that a previous 'underhaul' put the wrong parts back in.