Heavy hood, how can I make it easier to open?

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Loaderlou, Sep 27, 2021.

  1. Loaderlou

    Loaderlou Medium Load Member

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    Not a bad idea 88. I would think the pistons on a cab over are heftier than a hood piston. I’ll look into that today. I probably have most of the stuff available for airlines and splitter valves. Just a matter of figuring out which size pistons I would need
     
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  3. Rideandrepair

    Rideandrepair Road Train Member

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    Before changing springs for stronger tension, or shorter springs. You should look at the brackets, and locations on both ends. I’m not familiar with 359’s. Doesn’t matter. Same principles apply. When hood is closed, springs are stretched out to their fullest length. Sometimes they get put back in the wrong spot, after a repair. If You can lengthen the distance between both ends of the spring, where it’s attached, so the spring stretches out more, when closed. It will open easier. If you can’t increase the distances, another way, though less desirable,( more of a quick fix ). Would be to bind a few coils (however many it takes) together on each spring, on one end, both ends, in the middle. Whatever seems to work best. Don’t want to stress the ends too much, and have them break. Could be dangerous, if it hits you. A few inches in the distance makes a big difference. Ideally, they should be stretched enough to open easily, and still fully close. Post a picture if possible, with hood open, and each end of spring where they’re attached. Might be a simple fix.
     
    Last edited: Oct 1, 2021
  4. Loaderlou

    Loaderlou Medium Load Member

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    I understand what you’re telling me but how would you suggest I bind the coils together? And if that works for me, and my parts shop has a spring close or exactly to that length, wouldn’t that be a safer choice. I have a 379 exhd and it calls for the blue springs. I’ve changed the springs, studs on both ends and replaced all the rollers and rubber firewall pads. Other than the J hinges it’s all there but heavy.
     
    Rideandrepair Thanks this.
  5. Rideandrepair

    Rideandrepair Road Train Member

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    I didn’t know you already replaced everything with new. I thought of binding them with a couple SS hose clamps temporarily.Then with something stronger. Little U bolt things from Hardware or TSC I also thought they were old and weak though. Not sure how prone Pete’s springs are to breaking. My WS would break every few yrs. sometimes doing slight damage under the hood. Bad design. My Freightliners are 20 yrs old original. I was just trying to throw some ides out there. I considered putting a couple garage door springs inside of my WS springs, same length. Wish I knew more about the Pete’s design. I always thought the Pete’s aluminum hood was a lot lighter than other fiberglass hoods. If so, had to be something you can do.
     
  6. Rideandrepair

    Rideandrepair Road Train Member

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    0169436D-57D3-49B7-BC9C-8D6DC29DB63F.png I was thinking something like these. 2 on the ends of each spring.
     
  7. wore out

    wore out Numbered Classic

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    There is an art to adjusting a Pete hood. Most put it too far back which is actually set by the rubber mounts on the J brackets. The side rollers you just want snug. It should also sit square when open and not hang off 1 cable so to speak.


    You can modify springs add #### what ever till hell comes home. You may make it easier to open but you still haven’t corrected your major concern. Proper adjustment is the life of a Pete hood. Once they start shaking apart there is no reversal and it gets spendy.
     
    Tug Toy, Oxbow and Rideandrepair Thank this.
  8. Loaderlou

    Loaderlou Medium Load Member

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    Hey R&R I see what you mean now with the clamps. I was researching the length of the springs. The blue ones are 21” and the black ones are 20”. After I change the J brackets and hardware I think I’ll try the shorter springs along with a proper adjustment as per woreout. I have a gap of about 3/4” to the firewall when the hood is closed and a pinch lower than the firewall cowl. I’m sure with the new parts it will be different but what is the proper gap between hood and cowl
     
    Rideandrepair Thanks this.
  9. wore out

    wore out Numbered Classic

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    I’ll get you a measurement
     
    Rideandrepair Thanks this.
  10. Rideandrepair

    Rideandrepair Road Train Member

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    I have no idea. I’ve never had a 379. Just trying to throw some ideas out there.
     
  11. Loaderlou

    Loaderlou Medium Load Member

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    Thanks fellas I appreciate your help and advice
     
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