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Big Dog
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Posts posted by steeler

  1. 30 minutes ago, fjh said:

    It sure sounds like cups or bad injector 

    cumbustion in the fuel gallery.

    Yup, sounds like the classic cup problem. There is a fuel regulator fitting in the head, the mp7 one is on top of the head, front drivers side. Not sure about the mp8 location, but I doubt that will be your problem.

  2. Not to get off track but I put a basic in last year, fired it up, thump thump instantly. One of the cam rollers had a flat spot. That's when I learned Mack doesn't replace all of the lifters, they just inspect and reuse. No telling what your gonna get anymore I guess.

    Dakota, I don't know what kind of relationship you have with your dealer, but there are plenty that will do everything they can to pin it on you somehow. I'm with fjh, maybe let them take a look. 

  3. I had one years ago that had a similar problem, it was the Jake, even turned off. We pulled the Jake housings off and ran it, problem disappeared.

    In order to do that you would need shorter bolts obviously for the rockers. If it were me, that's the route I would take just to eliminate a Jake problem first.

  4. Ok found the problem. Thanks everyone for the suggestions.

    I started pulling injectors looking for a cracked tip.  The injectors looked awful new so we ran the part number and someone has put mp8 injectors in it. This truck runs all over the country as part of a fleet and rarely had the same driver in it so I guess that's why the company didn't put 2 and 2 together when the smoking started.

    So now I'm putting a cup and injector kit in it.

  5. I know this is old, but check your air compressor. Remove intake pipe from compressor and blow shop air in it with engine oil dipstick removed. See if you are getting air into crankcase. I've seen more than a few compressors with a busted piston do this.

    ETA....Didn't notice this is an mp engine. Might not apply in your case if the compressor intake is plumbed  into air cleaner pipe, and not boosted air.

  6. As 689 said, the old tools with the tap and puller is the only way you're going to get that out. Unless your luck is like mine.

    I broke one off in a d12 because I got lazy and didn't get it tapped all the way through. When I tried to tap it the rest of the way, it fell into the cylinder. Had to pull the head.

  7. Hi all, hoping for a little advise here.

    I'm working on an mp7 with excessive black smoke. Good power, runs fine, no boost leaks, just loads of black smoke under acceleration. Even stomping it in neutral will get a good puff of smoke.

    No dtcs. I've checked egr valve movement with vcads, compared boost, mass air readings to another truck of same engine. All readings are pretty much the same.

    It acts as if the egr valve is leaking/not closing all the way but I was hoping for another opinion or 2. I sure wish there was a way to block the egr off to verify before I go ripping her apart.

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