Crosman 766 Multi-Pump Pneumatic Air Rifle - Fault Diagnosis & Repair - Part Two

[@MrFactotum]

Practice makes perfect as the saying goes Alan, nice one👍👍👍👍👍👍 atb Kev

[@RetroSteamTech]

Thanks Kev. I was just glad I was able to get it working 🙂🙂

[@nobbysworkshop]

That’s a very familiar story Alan. Taking something apart and taking ten times longer to put it back together again. I wonder how many times that happens to us? 😂 Cheers Nobby

[@RetroSteamTech]

If my experience is anything to go by Nobby, all the time! Cheers, Alan.

[@SteamEngines-Jim]

I'm aways careful with springs Alan, I wouldn't like to count up the hours I've spent on hands and knees looking for springs that have shot out.

[@RetroSteamTech]

I know Jim, I've been there myself 🤣🤣

[@Xynudu]

Hi Alan. Strange they don't include that small green "O" ring in the kit. Green "O" rings are made from hydrogenated Nitrile. They are high temperature and pressure variation capable. Ducati use a few green ones for specific oil galleries on the cylinder head/barrel faces, so I'm familiar with them. I expect green ones would hold their shape longer than plain black in your application. Black rings tend to crush over time. I hope this helps. Cheers Rob

[@RetroSteamTech]

Thanks Rob. I should have realised it was probably Nitrile. I do have a box of assorted Nitrile O rings but unfortunately didn't have one the right size for this. I'm fairly sure the one I used will last a reasonable amount of time as the rifle will only get used occasionally. Cheers, Alan.

[@Xynudu]

@@RetroSteamTech Hi Alan. Yes. I expect it will be OK for quite a long time. I wonder how many PSI that chamber pumps up to ? Cheers Rob

[@cal2299]

800-1500psi​@@Xynudu

[@RetroSteamTech]

@@Xynudu Not really sure on the PSI, generally the manufacturers only give feet per second info on their air rifles and as far as I know there is no direct correlation between PSI and FPS.

[@Xynudu]

@@RetroSteamTech Hi Alan. The reason I asked was to determine how much pressure that "O: ring will be subject to. We will be talking big numbers I expect. Cheers Rob

[@robertcalvin5701]

I have one like that I having the same problem can you fix mine?

[@RetroSteamTech]

I only work on my own air guns. It is fairly easy to do though. Just follow what I do in the video.

[@robertcalvin5701]

@RetroSteamTech where you get the replacement parts?

[@RetroSteamTech]

@@robertcalvin5701 The parts came from ebay. I can't place a link here but the seller was 'AlchemyAirWerks'.

[@robertcalvin5701]

@@RetroSteamTech thanks