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About mackrmodel686st

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    Over Drive
  • Birthday 09/02/1980

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    r 686st
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  1. I have a 1999 ch613 Mack with an e7 427 engine that keeps blowing the fuse for the ecu when I turn the key to the run position before I even start it. I'm sure it's a short somewhere, but I don't know where to start looking. Could anyone help me?
  2. Mack rear main seal removal

    Thanks again. I know about the install tool as I said, I've done the install a few times, just never pulled one without pulling the flywheel housing.
  3. Mack rear main seal removal

    I'll give that a try. Thanks.
  4. Mack rear main seal removal

    I have a 1993 ch 613 mack with a 400 engine. I'm replacing the trans and noticed oil in the flywheel housing, pulled the flywheel and sure enough the rear main seal is leaking. How do i remove the old seal, I've replaced a few on the e7 engines, but was always replacing the flywheel housing also. How do i go about removing the old seal without pulling the flywheel housing off?
  5. 2001 Mack cx613 heater controls

    The ch613's we have are the same way, but I think the cx613's are electric.
  6. I've got a 2001 cx613 Mack vision that doesn't switch between defrost, floor, dash and mix. I've replaced the controls but didn't fix the problem. I don't see any burnt or melted wiring. Can anyone point me in the right direction on how to fix this issue?
  7. There are two switches, one for the headlights and markers, one for the clearance lights.
  8. I've got a 2001 Mack cx613 that keeps burning out the headlight switch every few weeks. When it happens the headlights continue to work, but the tail lights, marker lights in the hood and center three clearance lights on the roof don't work. Also the dash lights go out too. I change the switch out and it works fine for a couple weeks, then the lights go out again. Can anyone point me in the right direction on how to cure this problem once and for all?
  9. want to convert from air bag to camelback

    Why would you want to do something so silly? A camel back suspension will add about 1000 pounds to your truck and make it ride rough as hell.
  10. egr delete kit

    You wouldn't happen to have any pictures of what you did.
  11. vmac 1 injection pump diagram

    It boils down to injectors, cam timing, bigger turbo, and computer programming. My boss had it done to one of our 350's and had it converted to a 427. It's expensive but can be done. It would almost be cheaper to find a used 427 and swap it out. Either way it's gonna cost you about 20 grand. As is, your truck has a good, reliable motor that will get decent fuel mileage, it's just gonna be a bit of a dog off the line, excuse the pun.
  12. Engine block E7 E Tech

    Based on my experience, an e7 is an e7, as In all the same. The 300, 350, 427, and 460 are horsepower ratings. They have different injectors, turbos, and cam timing. Oil coolers can be either the cast-iron barrel type or the flat tin type, will have different filter brackets depending but both will work. The manifolds are the same, so are the valve covers, oil pans, flywheel housings and flywheels.
  13. Fan Clutch not working.

    All the e7 air clutches I've worked on at my shop need air to disengage the clutch and let the fan spin free. I have had one get stuck engaged even with shop air. I sprayed some pb blaster in the air fitting and around the clutch assembly and it freed up. Works fine now. Also check to make sure your air solenoid is working. The ones I deal with need 12v power to shut the air off and turn the fan on. I know it sounds backwards, but that how it works. Also, your computer may not be sending power to the solenoid, you can check that too.
  14. I have a 1980 r model with mack axles and a camel hump suspension. I'm gonna be grafting the rear frame from a 1999 ch mack for the air ride suspension onto the r model. I also have the mack axles from a 1993 ch mack to go under the air ride. My question is, will the differentials from the 1980 mack axles work in the 1993 housings? The r model has a maxidyne engine with a maxitorque twin stick trans and don't want to change the axle ratios.
  15. 1981 mack motor

    If it is a mack engine, it's most likely a 300 maxi-dyne. Was the most common engine they made back then. The company I work for has one, and used to have another one.