Drop in piston upgrade for c362

[Spacebus]

My C362 developed a leak shortly after I got it when I left it up in the attic without any pumps for a few weeks over the winter. It won't hold air over night and the velocity goes down if I wait after pumping. I want to tear it down and fix it, but if I'm going through that much trouble I'd like to upgrade some parts. I already have the MAP transfer port which I bought when I upgraded to an aluminum upper from Baker.

Is there a drop in/off the shelf piston upgrade? There seem to be options for the valve, but all the pistons I see are for the 13xx.

Not looking to build a crazy high power MSP, especially since I don't usually pump this thing up very high. I just hate reinstalling OEM parts if there are upgrades available.

[Spacebus]

Is it worth getting a different hammer and/or spring?

[Back_Roads]

 Hammer and spring are fine, polish the area that the hammer slides, open barrel port to max .180 ish. the piston and pump cup are fine also, just replace the cup if there is leaking past that while pumping.
 I did a flat top piston valve had to cut drill and thread part of the piston and screw the FT into the OE part, not sure if anyone has come up with a drop in kit yet, but OE works just as well IMO.
 Hogging out the valve gives more air volume but needs more pumps to get the gain.

[Spacebus]

Hammer and spring are fine, polish the area that the hammer slides, open barrel port to max .180 ish. the piston and pump cup are fine also, just replace the cup if there is leaking past that while pumping.
 I did a flat top piston valve had to cut drill and thread part of the piston and screw the FT into the OE part, not sure if anyone has come up with a drop in kit yet, but OE works just as well IMO.
 Hogging out the valve gives more air volume but needs more pumps to get the gain.

I'm betting it's a leaky poppet rather than a leaking check valve since I stored it without air and the hammer resting against the valve. Should I just get an OEM piston and valve from Crosman? I never have good luck getting a poppet to seal after it starts leaking. I'm also doubtful that both the piston and check valve are getting leaks. Maybe I should have used a water test before I took it apart 😂

[Back_Roads]

 Be cheap and simple, can always try other things later, if it shoots good after. or save up and get the anniversary wood edition next

[Spacebus]

Be cheap and simple, can always try other things later, if it shoots good after. or save up and get the anniversary wood edition next

I would soon as rather just get a DF MKII over the wood C362. However, I'll be happiest with just getting my 362 holding air! Maybe I should just do the old alcohol flush before I take out roll pins.

[19Sheridan57]

   Have you oiled it to see if it would come back to life ?

[Wayne52]

Dang Dj mine has been up in the attic all winter too, I better go up there right now, bring it down and see how it's doing

[Spacebus]

   Have you oiled it to see if it would come back to life ?

Yes, but maybe I should try some "secret sauce" instead of silicone oil.

[Wayne52]

Well I just went up there brought it down, put 3, 5 and 8 pumps through it and it seems to be right up to snuff with the wadcutters

[Wayne52]

I used pellgun oil in mine, I've probably put no more than 10 drops through it since I've owned it.

[Wayne52]

I've researched pellgun oil and it's actually a special blend of diesel engine oil, from what I remember it's made in Australia. You can buy it but
be ready to buy no less than 50gallons of it if you want it.

[MI Yeti]

I've researched pellgun oil and it's actually a special blend of diesel engine oil, from what I remember it's made in Australia. You can buy it but
be ready to buy no less than 50gallons of it if you want it.

yeah its MONOLEC GFS SAE 30 weight

[ray1377]

https://f.hubspotusercontent00.net/hubfs/8151552/msds/SDS-PELLGUNOIL.pdf

Yep, just straight 30 weight "NON-DETERGENT" motor oil made in TEXAS
Thx
Ray

[MI Yeti]

https://f.hubspotusercontent00.net/hubfs/8151552/msds/SDS-PELLGUNOIL.pdf

Yep, just straight 30 weight "NON-DETERGENT" motor oil made in TEXAS
Thx
Ray

Pellgun oil/ monolec gfs 30 oil has a very high level of detergent in it.

[Spacebus]

I used pellgun oil in mine, I've probably put no more than 10 drops through it since I've owned it.

I thought you were supposed to put in a few drops every hundred shots?

[7624452]

https://f.hubspotusercontent00.net/hubfs/8151552/msds/SDS-PELLGUNOIL.pdf

Yep, just straight 30 weight "NON-DETERGENT" motor oil made in TEXAS
Thx
Ray

Pellgun oil/ monolec gfs 30 oil has a very high level of detergent in it.

I was under the impression that it was the "detergent" in oil that was bad for o-rings.  Is this incorrect ??

[MI Yeti]

https://f.hubspotusercontent00.net/hubfs/8151552/msds/SDS-PELLGUNOIL.pdf

Yep, just straight 30 weight "NON-DETERGENT" motor oil made in TEXAS
Thx
Ray

Pellgun oil/ monolec gfs 30 oil has a very high level of detergent in it.

I was under the impression that it was the "detergent" in oil that was bad for o-rings.  Is this incorrect ??

it dose not do anything to o rings that I have noticed. I have used standard motor oil in my crosman pumpers for years.

[Spooner]

I am a bit surprised that by this point someone hasn't offered an adjustable FTP setup. With the new wood versions coming out, and interest still there for this platform, I would have thought folks like Alchemy Airwerks, Alliance Hobby, or Mellon would have taken some interest it?

[threesuns]

I think the problem is the predecessors that used the same pump rod. The 766, 2100 and 2200 were not easily flat topped due to the valve design. Drilling and tapping the OEM piston sounds like the best option.