Much easier to pull the injectors if you unbolt the entire rocker shaft and get it out of the way.
American Diesel has all the parts including copper injector seals, copper fuel return line (leak-off) seals, and rubber injector seals. They can provide exchange injectors so you can pull the old ones, install the new ones with all new seals, and just send the removed injectors back.
Yes, you can anneal the copper seals but I don't think it's worth it.
Yes, I have pulled the injectors. Not a bad job, no special tools except a torque wrench. Give yourself a day for the first engine.
After you reinstall the rocker shaft do a cold valve adjustment, then start the engine, warm it up and do a warm valve adjustment.
PM me with a phone or email if you have questions.
still wondering why some remove the rocker assembly and some don't...
It takes only a few minutes to unbolt and remove the rocker shaft. Then you have easy access to the leak-off tube bolts, it is easy to remove the leak-off tube itself, and then you have wide-open access to the injector bolts and injectors for removal and reinstallation.
After reinstalling the injectors and leak-off tube it only takes a few minutes more to reinstall the rocker shaft, and if it's time to do injectors it is also probably time to do a valve adjust anyway.
The fuel pipes are easily obtained from American Diesel.Its easy, Stretch, no special tools, don't take off the rocker arms, you can anneal the copper washers and re-use them. Take the injectors to a farm shop, same injectors as used on some combines and tractors; don't take them to a "marine" specialist and pay double. Good time to check the cyl head torque and re-set the valves (if memory serves the engine has to be operating temperature?). If you haven't done this for a while the rubber seals on the side of the head might be stiff or brittle, but they should be easy to replace if they are. They don't have to be too tight.
When I put my new injectors in, I didn't need to bleed them, the old dear just started right up. i did undo each injector in sequence to make sure they were all working (I did find one injector that was dead after servicing!) and then I put the valve cover back. She's even noisier with the valve cover off, don't forget ear protection and some sort of goggles for the oil.
Be very gentle with the fuel pipes as they are expensive and a bit rare.
still wondering why some remove the rocker assembly and some don't...