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Thread: Removing, rebuilding, reinstalling Hydraulic Head

  1. #31
    Sergeant
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    Kennys,
    Yes, the bowtie washer (plunger guide) has a lot of slop by design, so you are good to go with the unbroken one you got from Gimp. I doubt there's any advantage to fabricating a tighter-fitting one. And the $15 + shipping price for a new one from Ambac may not be too extortionate considering the small number of these any of us is likely to need in our lifetimes.
    Congratulations on tackling a job that is more intimidating than difficult, and WINNING!
    Richard

  2. #32
    Sergeant Major stevegr's Avatar
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    Kenny,

    Excellent write up! The pics and info you've posted have been very helpfull to me. The plunger in my deuces hh will not retract. I've sprayed PB Blaster tapped it back down, spun the engine over, sprayed PB Blaster, tapped it back down and repeat. I'm hoping to work the plunger free by doing that without having to remove the hh.

    I have a question on the measured height of the plunger in the hh. Did you happen to measure the height of the plunger when it was in the fully up position before removing the hh from the ip? I removed the plunger screw, measured the height with calipers as 1.102" from the top surface of the hh. I can tap the plunger down and get a reading of 1.275" from the top of the hh. I'm hoping someone has measured this that has a good hh with the button intact on the end of the plunger as that might confirm if the button has fallen off of my plunger.

    Thanks,

    Greg
    Greg

    1971 M35A2
    1975 M105A2

  3. #33
    4 Star General kennys@wi.rr.com's Avatar
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    Greg,

    I would guess the button fell off the bottom. If I was you I would remove the HH to make sure you free it correctly. I will offer any help I can to walk you through the process.
    Rebuilding an HH

    1971 AMG Deuce Sold

    1985 AMG M923A1

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  5. #34
    Sergeant Major stevegr's Avatar
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    Kenny, thank you. I might take you up on that offer of help.
    Greg

    1971 M35A2
    1975 M105A2

  6. #35
    4 Star General marchplumber's Avatar
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    Congrats on fixing the "dreaded HH!" Courage isn't the lack of fear, it is goin forward through it! Positive thinking! and leading by example!! Negative thinkin gets ya no where! First Team, Sir!
    God bless,

    Tony

  7. #36
    Sergeant Major stevegr's Avatar
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    Halleluiah and Yee Haw! Fixed the hydraulic head on my deuce yesterday and she's running great. The button, button spring retainer and one valve lock had come loose. Fortunately there were no broken parts and I did not have to lap the plunger or the hole because the plunger was moving freely. Took everything apart including the check valve, cleaned it with carb spray, silicone spray and compressed air. Generously oiled the plunger and all other moving parts, reassembled and reinstalled the hh and my deuce is running great.
    Attached Images Attached Images
    Greg

    1971 M35A2
    1975 M105A2

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  9. #37
    General scrapdaddy's Avatar
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    Steve, can your plunger slide all the way through , when you had it apart or did it get tight at one end. I'm working on a generator, but it's almost the same pump. Moves free and easy until the one end gets to a spot then tightens up. keep checking, prolly my problem.
    Ron
    86 AN/MJQ-18
    71 m35a2 w/w
    51 m37 w/w

  10. #38
    4 Star General kennys@wi.rr.com's Avatar
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    Ron,
    It should be able to move all the way through the bore hole. The best way I can describe the resistance is similar to that of a shock absorber. And it shouldn't all through, that would be too loose.

    Greg,
    Very happy to see you got it working again.
    Rebuilding an HH

    1971 AMG Deuce Sold

    1985 AMG M923A1

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  12. #39
    Colonel merlot566jka's Avatar
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    Very good! I like this thread!

    I often pride myslef on the "un-doable" tasks I seem to accomplish. Thumbs up!

    This plunger...this compresses the fuel and moves it into??? I assume the area where its distributed to the lines, what distributes it?
    How is the quantity of fuel injected determined?
    how is the timing of the fuel injection pulse controlled?


    .... sorry dont mean to hi-jack your thread, just curious.

  13. #40
    4 Star General kennys@wi.rr.com's Avatar
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    As the plunger moves up it also turns. The up stroke is where the preasure comes from to open the injectors. As it turns and moves up it comes into position with two pin holes that lead to two injector lines. When the IP is installed it must be timed with the motor the same way you time a cam shaft. The HH also has a timing mark on it in the form of a scored or red colored tooth. The most common problem I have found is the button on the bottom of the plunger falls off and then the plunger just won't go up and down or it gets jammed into the plunger causing the plunger to get stuck.
    Rebuilding an HH

    1971 AMG Deuce Sold

    1985 AMG M923A1

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