wilbur Posted October 11, 2019 Share Posted October 11, 2019 There was a service bulletin a while back about the actuator pin adjusting screw for the valve yoke on a Jake brake engine . It gave a measurement and said to replace if below that measurement. I had it some where but cant find it. 0.980" comes to mind but not sure. Any body? Quote Link to comment https://www.bigmacktrucks.com/topic/59383-service-bulletin-for-421gc41cm/ Share on other sites More sharing options...
j hancock Posted October 12, 2019 Share Posted October 12, 2019 https://parts.jacobsvehiclesystems.com/files/support/docs-pdfs/sb266017.pdf May help? Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/59383-service-bulletin-for-421gc41cm/#findComment-433803 Share on other sites More sharing options...
wilbur Posted October 13, 2019 Author Share Posted October 13, 2019 It came to my dealer as a service bulletin, and I wrote the dimension in the mack service book but someone borrowed the book and i dont remember who. If anyone remembers the bulletin or where I could find it let me know. Thanks Quote Link to comment https://www.bigmacktrucks.com/topic/59383-service-bulletin-for-421gc41cm/#findComment-433872 Share on other sites More sharing options...
j hancock Posted October 13, 2019 Share Posted October 13, 2019 .960 is indicated in previous conversation here. Your memory is pretty close! https://www.bigmacktrucks.com/topic/14277-jake-brake-problems-also/ Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/59383-service-bulletin-for-421gc41cm/#findComment-433876 Share on other sites More sharing options...
wilbur Posted October 13, 2019 Author Share Posted October 13, 2019 Thanks Jhancock appreciate it, but i wouldnt call 0.020 as being pretty close. Thanks again Quote Link to comment https://www.bigmacktrucks.com/topic/59383-service-bulletin-for-421gc41cm/#findComment-433878 Share on other sites More sharing options...
j hancock Posted October 13, 2019 Share Posted October 13, 2019 Wish my memory was only off by .020! 1 Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/59383-service-bulletin-for-421gc41cm/#findComment-433879 Share on other sites More sharing options...
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