O-Rings for injector pump

[Paddy]

Hello all,

I have a leak on my Chinese tractor injection pump, KAMA 454. The leak is on the top side at the delivery valves. There are 3 sizes and a crush washer. I can't get parts for this, just a replacement pump.

Do you trust NAPA O-rings? Do you think just taking measurements will net the correct size? They look to be still soft and flexible.

 

[Sportsman762]

O-rings are a pain to measure. But they will most likely be metric for the Kama. If memory serves me right the napa O-rings are 70 durometer buna. Buna is good for diesel. In theory they should work if you get them measured correctly. I am guessing Kama parts support is non existent?

 

[Paddy]

They sell pumps, but not parts for them.

I found a O-ring calculator at;

Engine Tech | O-Ring Measuring and Material - DSPORT Magazine

There are numerous small components on your cars engine that are always overlooked, and O-rings are definitely on that list.

dsportmag.com

The top O-ring cross section measures small compared to the formula, this likely where it's leaking

 

[Rebeldad1]

There is a pump rebuilder on here somewhere. Try him for parts.

 

[Paddy]

I did contact thepumpguysc, he does not sell parts

 

[STx]

I bought a Viton o-ring set off Amazon to just have them on hand. Not cheap but, best for fuel contact.

Viton O-Ring Kit, Black, Viton, 90A Durometer, 30-Sizes (Pack of 382 Pieces): Amazon.com: Industrial & Scientific

Viton O-Ring Kit, Black, Viton, 90A Durometer, 30-Sizes (Pack of 382 Pieces): Amazon.com: Industrial & Scientific

www.amazon.com