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 https://www.bigmacktrucks.com/topic/48270-ac-460-broken-rocker-arm/ 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 https://www.bigmacktrucks.com/topic/48270-ac-460-broken-rocker-arm/#findComment-357431 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 https://www.bigmacktrucks.com/topic/48270-ac-460-broken-rocker-arm/#findComment-357461 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 https://www.bigmacktrucks.com/topic/48270-ac-460-broken-rocker-arm/#findComment-357709 Share on other sites More sharing options...
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