For those of you who have hand pumps that you think have actually failed due to overheating. How hot do you think you got it before it actually went bad?
Silicone has about the same high temperature rating as Viton but it also has very poor abrasion and tear resistance. Not a good material for this application.
Agreed, silicone oil for the dynamic O-rings of a high pressure pump. Oil, not grease. 30W works well.
https://www.amazon.com/gp/product/B0006MZSRW
It is also sold as treadmill lubricant. Just read the description carefully to be sure whatever you get is silicone and silicone only. Most will be.
Healthservices
Thank you for watching video, much easier to discuss and understand. I don't recall Coby Leo ever mentioning "automotive" coolant, he just called it coolant. You are correct, when I tilted my pump to empty coolant into cup, like Coby Leo, nothing came out. NO COOLANT installed. You are also correct that the coolant system is a totally separate and contained chamber, not able to add moisture to compressed air. Antifreeze and mineral oil are both good replacements for coolant, but you can always re-use coolant. Like dizzums said, periodic breaking down, cleaning and lubing will help it last years. Not sure if you've had your pump apart yet, but watching Coby Leo's video a few times gave me confidence to go ahead. Now I laugh at my hesitancy, seems so easy now. As always, we're here to help,
WM