KParr Posted 7 hours ago Share Posted 7 hours ago I just changed the rocker arms shaft and bolts on my 2006 MR688S because two of the bolts snap. Now there’s a ton of white smoke coming out of the exhaust and I have no throttle response. Does anyone know what would cause this. Quote Link to comment https://www.bigmacktrucks.com/topic/75493-kevin-parr/ Share on other sites More sharing options...
Joey Mack Posted 6 hours ago Share Posted 6 hours ago Was the valve adjustment done according to the book ? Mack engines are done differently, and if you have powerleash engine brakes, its even a bit more different. Be careful. You have ceramic lifters, and they dont respond well to shock loads at all. Quote Link to comment https://www.bigmacktrucks.com/topic/75493-kevin-parr/#findComment-575190 Share on other sites More sharing options...
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