Injector jam nut size?

[S/V Selene]

Hello all.


I have a 1982, Perkins 4-154 62hp motor in my Morgan OI 416 and I wish to purchase a "jam nut valve adjustment tool." See attached image.



I have scoured my shop manual and owners manual bur there is nothing that indicates size of the jam nut.


Does anyone KNOW the size? Yes I could remove the cover but I would prefer to not get that involved until the time comes to remove it to do actual work at which time I would like to already have the proper tools.


Thank you in advance.

[deblen]

Try https://www.foleyengines.com/brands/...nes-and-parts/


https://www.kp44.org/ftp/Perkins_4-154_Shop_Manual.pdf


Typical adjustment using box end wrench & screwdriver.

https://www.youtube.com/watch?v=LAK3vr-jov4&t=72s