TimberJack Posted October 2, 2016 Share Posted October 2, 2016 Just installed a new rear head on my AC 427. Got it all put back together and was running overhead and had a problem on #4 Jake adjustment, with the screw backed all the way out I could not get my feeler gauge in between actuating pin and the piston. I had no problem with the others. Any help would great. Thanks Quote Link to comment https://www.bigmacktrucks.com/topic/47119-jake-brake-adjustment-problem/ Share on other sites More sharing options...
steeler Posted October 2, 2016 Share Posted October 2, 2016 (edited) You need to install 3 .025 shims under the rocker stands of the rear head. Common issue with a re man head. I can't think of the part number off the top of my head, but your dealer should have them in stock. Reason for this is that your head was machined and now the valves are sitting higher. Shimming up the rocker will eliminate any engine brake clearance issues. Edited October 2, 2016 by steeler Quote Link to comment https://www.bigmacktrucks.com/topic/47119-jake-brake-adjustment-problem/#findComment-347538 Share on other sites More sharing options...
TimberJack Posted October 2, 2016 Author Share Posted October 2, 2016 Ok thanks for the info. Quote Link to comment https://www.bigmacktrucks.com/topic/47119-jake-brake-adjustment-problem/#findComment-347543 Share on other sites More sharing options...
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