bubbamobilin Posted January 7, 2017 Share Posted January 7, 2017 2004 Vision with an AC 460 came into my shop about a week ago with a broken rocker arm on the #5 exhaust valve. Replaced rocker and adjusted valve because the whole top end was out of adjustment. Now it's with another broken rocker. I'm betting #5 exhaust. This truck is equipped with a Jacobs engine brake. It is also not the original engine. Original engine threw a rod on #5. After discussion with my Mack dealer we think this engine was equipped with a Power Leash instead of Jacobs. We are trying to cross reference some numbers. Has anyone else experienced anything like this? Quote Link to comment Share on other sites More sharing options...
fullfuel01 Posted January 7, 2017 Share Posted January 7, 2017 call Harold at Nortwest truck center. 800-665-9248 he got me in the right way more then one time. really really good Mack guy. 1 Quote Link to comment Share on other sites More sharing options...
Mackpro Posted January 7, 2017 Share Posted January 7, 2017 5 hours ago, bubbamobilin said: 2004 Vision with an AC 460 came into my shop about a week ago with a broken rocker arm on the #5 exhaust valve. Replaced rocker and adjusted valve because the whole top end was out of adjustment. Now it's with another broken rocker. I'm betting #5 exhaust. This truck is equipped with a Jacobs engine brake. It is also not the original engine. Original engine threw a rod on #5. After discussion with my Mack dealer we think this engine was equipped with a Power Leash instead of Jacobs. We are trying to cross reference some numbers. Has anyone else experienced anything like this? You might be onto something, I have a chart at work with all the camshaft part numbers for the ASET engines. I know the powerleash has its own camshaft . However I don't know if it is compatible with the Jacobs brake 1 Quote Link to comment Share on other sites More sharing options...
Mackpro Posted January 9, 2017 Share Posted January 9, 2017 Look at the top of page 6 of this Bulletin. Some camshafts that came in some AI engine cant be used with the Jacobs brake/J-tech brake sb213035 E-tech camshaft.pdf 1 Quote Link to comment Share on other sites More sharing options...
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