OC12 injectors

[DannyPlant]

Hi. I have spoken to Nigel Collins father who is rebuilding an OC12 and he has given me some more imformation about the tractor. Nigel has already sent a messge asking if anybody can give him the correct break off pressure for the injectors. They are American Bosch injectors with the number. AKB25R769-55 or AK825R769-55. I believe it has a Roostamaster pump on this machine. I hope this can be of some help. If antone can give me the break off pressure it would be grateful. Thanks DannyPlant.

[cletracboy]

1650 I think but I can check it up soon.

[John Schwiebert]

Without checking for me too does it make a difference if they have the model A Roosa or the model d Roosa pump

[cletracboy]

Hello

I'm affraid I don't know the answer to John's question, but the very last of the Oliver BD's had the Roosa pump on the DJXC engine.  My manual is from December 1958 and gives the pressure as 1650 pounds.  I hope this helps you.  Sam

[DannyPlant]

Thanks a lot for your help, i will relay the message. The injectors are running between 1200 and 1600 at the moment when they were tested, so your imformation is a great help. I will let you know how he gets on. Thanks again DannyPlant.