little puppy Posted January 17, 2018 Share Posted January 17, 2018 2011 mp8 def motor. 395k mls. Question ? If I already have the stainless/ conical injectors and seals, then if my motor runs good, why should I need to replace all the injectors? Can't I just do the cups? Thanks for any input. Quote Link to comment https://www.bigmacktrucks.com/topic/52230-cup-seals-injectors/ Share on other sites More sharing options...
Mackpro Posted January 18, 2018 Share Posted January 18, 2018 If you have the hard start problem but engine run fine , the sealing surface on the injectors sealing surface to the cup could be pitted to the point that it wont reseal with just a new cup. Mack has guide lines on this. Pretty much , if the sealing surface is pitted you replace the injector. Quote Link to comment https://www.bigmacktrucks.com/topic/52230-cup-seals-injectors/#findComment-389964 Share on other sites More sharing options...
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