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Ahubbard

Porch Pup
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Ahubbard last won the day on January 10

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About Ahubbard

  • Rank
    Old Iron Expert
  • Birthday 10/20/1983

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  • Website URL
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Profile Information

  • Gender
    Male
  • Location
    Finger Lakes Region, Ny

Previous Fields

  • Make
    Mack
  • Model
    RD688s
  • Year
    1999

Recent Profile Visitors

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  1. This may be out of my price range... Sent from my iPhone using Tapatalk
  2. Exhaust manifold on my 1994 e7 pln mechanical is leaking again. Number 4 flange and also between the turbo and manifold. Few years ago i had it off for leaks and took it to the local machine shop. They put it on a big belt sander and trued up the flanges best they could for me. Then when I switched turbos this past spring I broke a turbo mount stud. Long story short that one got a helicoil and bolt put back in it after a long day of swearing and breaking drill bits. (Was not my day for sure that day) Also this “fix” is probably a big contributor to the leak at the turbo gasket. Anyway, I am at the point that if she’s leaking again, I think it’s time for a different one to go back in it’s place. The one in place on the motor has long bosses where the studs come through. I have one on my old parts etech that would use Short studs instead. Any reason I can’t put short studs on the pln motor and use the manifold off my old etech? Or any reason I wouldn’t want to? I haven’t done a search yet. Maybe the old longer style are readily available as good used parts still. Not sure what new from Mack would be $$$. Trying to keep it a budget project but get myself back to a good sturdy non-leaker Sent from my iPhone using Tapatalk
  3. I put a clutch in three weeks ago. That thing started making a bunch of chatter under there. Worn all to hell around those torsion springs when I got it out. That was old too... but this summer of running the truck this way didn’t do me any favors there I suppose. Sent from my iPhone using Tapatalk
  4. Hey I have somewhat of a conclusion to this thread. I traded the injection pump in for a reman one this week-Finally had some down time. This fixed the problem with my gallop at 1200 rpm. Haven’t had a load on yet but the test drive seemed to go fine. So I don’t know what specifically was the problem in the pump... probably something in the governor. Thing was worn out either way. Almost 26,000 hours on her. So I am a happy camper. I still have a bit of a shake/ vibration in the engine overall. Not sure what. It’s not bad but noticeable. Nothing that more time and $$$ can’t fix I suppose. I just wanted to follow up so the guys who were helping me diagnose could know that my gallop problem was in the injection pump. Resonant ride, worn parts, high speed and overload are my conclusion. Thanks again everyone Sent from my iPhone using Tapatalk
  5. I mounted my ball valve to the engine side of the firewall. I took the handle off first and mounted it at a spot with a hole. Then I put the handle back on in the cab side of the firewall. Still have to turn it in and off on a cool morning ... but I don’t have to pop the hood. I just reach down under the dash above the throttle pedal. Works like a charm. Sent from my iPhone using Tapatalk
  6. Here is a picture from the book. I imagine that one that is underlined is yours. I don’t have the book in front of me right now for any torque numbers. This was a picture I sent my buddy last winter. If you need anything else I can look it up in a bit. Sent from my iPhone using Tapatalk
  7. I appreciate all the help guys. We will get this fixed!!! I would love to get any info people have on a fix to this resonant ride problem... makes it easier when I talk to pump shop if I have an understanding about things. Sent from my iPhone using Tapatalk
  8. My problem definitely isnt under load. It actually does it most prominently when I rev the motor up past 1200 and then let it back to 1200. Or for example when I come to a 35 mile per hour zone and don’t downshift if my foot is lightly pushing the pedal as i coast through it starts the gallop. Is there potential for this condition to damage anything if I run it? I am hoping to get through my busiest season and get to October/November before I take the pump off and send it to the shop. Sent from my iPhone using Tapatalk
  9. Yes I will get that feeling when I drive. Almost feels like the spring is too light on the throttle return even though it’s not. I will let my foot of the throttle some and lay back in to correct that sometimes. When this does it at 1200 it almost is like a horse galloping. Rhythmic and kinda shakes the motor. Sent from my iPhone using Tapatalk
  10. Like governor fluctuating at this rpm? Sent from my iPhone using Tapatalk
  11. I am not sure what this means Sent from my iPhone using Tapatalk
  12. Ok... here we go. I took a trip to Antrim Diesel today. Kevin checked my injectors and didn’t find one good one. Lol. MAYBE number 6 was decent but still bad. #1 and #2 were terrible. Think just streaming fuel on the pop tester. Yikes. Guess I got my use out of those. Traded them in for a reman set he had on the shelf that have a little better flow. Came home this afternoon and installed them. That solved my return fuel problem. Nice clear fuel with no bubbles in the return line. Took that running out of fuel sound away. But I still have the shake/chug at 1200 rpm. That’s a little frustrating. Can’t figure out why it is at only one specific rpm. Smooth as silk at idle. And smooth above that..even at 1250 for example. Wonder if this could be in the pump. Someone else suggested a cracked line between the pump and injector somewhere. I didn’t have them totally out I just backed the nuts out and pulled then back an inch to clear the injectors when I switched them. I should have picked kevins brain a little more about it at Antrim. But with a 4 hour ride one way I guess I got a little hurried to get home and install my new toys. I wish I could post a video here so you could hear it. On the bright side the new injectors are great! Test drive shows a noticeable power gain and I feel like (other than 1200 rpm) the engine has less vibration. Took my turbo boost pressure from about 28 psi to 35. Gotta watch the pyro harder now!!! Probably will have to get a bigger turbo... might as well have the pump worked over while they check it..... lol ANY MORE IDEAS?! I am going to work the truck tomorrow. Gonna have to keep running it. I am just not sure where to go from here. Sent from my iPhone using Tapatalk
  13. I think I am pretty set that I have a problem there and I should pull injectors and see what’s up. They do have 25,000 hours on them. I just didn’t want to jump to conclusions and not diagnose. I feel like if taking that return line off the head eliminates the air cycling around my injection pump then I probably have narrowed it down to injectors. Too bad...I should have planned ahead. Last winter would have been a good time to do injectors. Dump truck suppose to be running in summer!!!! Thanks for the help I will keep you posted what I find. I figured I had a lot of information but I didn’t know exactly how to use it. Guys in here always seem to know their stuff!! Sent from my iPhone using Tapatalk
  14. Just now I pulled the return line off my head. I put my thumb over the line to keep fuel from feeding back from the pump. It cleared up the air in that lower line. I am getting no fuel out of the front head. There is pressure there when I put my thumb over but no fuel. I took the little crossover to tube off from between the heads. Ran truck with it off. Back head consistently spills fuel out and front head has nothing. Unless I put my thumb over it then I get a big shot of air and a small surge of fuel when I let my thumb off. Is it possible to have a bad injector or cup that is letting compression in the system causing my air problem in the return lines and pump? Sent from my iPhone using Tapatalk
  15. After further inspection that 2 prong banjo fitting just has a small orifice behind it. Nothing seemed blocked there. I looked harder at the return line from the head and am not really getting any fuel coming back through that line. Just the first couple inches have fuel in it. But that lower line flows a ton of air through it. I ran the suction line into a pail of diesel and then also ran it with the outlet line from the lift pump direct to the injection pump. No change either way. Is my lift pump or flowing enough or should I be thinking something with the injection pump? Sent from my iPhone using Tapatalk
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