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Anyone interested in heavier duty hydraulic head button retaining clips?

DavidWymore

DavidWymore

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Got test piece from waterjet, I'm liking it. Forms/bends well and is nice and strong even before heat treat. Going to have him add some more meat to the O.D. and then we'll make the forming jig.
 
DavidWymore

DavidWymore

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Update: Have a trial run of 10 pcs waterjet cut and need to get in the machine shop to make the bending/forming jigs, but we are overbooked for a while. Having a hard time finding good manual machinists.
 
Floridianson

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Hope all works well. Would be interesting if the button retainer tabs could be longer and extend under the plunger spring locking it in place instead of a friction fit. As the threads have talked about I believe the clip was designed just to hold the button on long enough to install the Head. With button/plunger installed and always in contact with the tappet it makes no sense why we loose them. Just had a thought on the wear of the button could it wear out enough to allow a gap between the it and the tappet? That meaning if the button clip falls off we need a new clip and button.
 

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rustystud

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Floridianson said:
Hope all works well. Would be interesting if the button retainer tabs could be longer and extend under the plunger spring locking it in place instead of a friction fit. As the threads have talked about I believe the clip was designed just to hold the button on long enough to install the Head. With button/plunger installed and always in contact with the tappet it makes no sense why we loose them. Just had a thought on the wear of the button could it wear out enough to allow a gap between the it and the tappet? That meaning if the button clip falls off we need a new clip and button.
Click to expand...
I believe it has more to do with a weak spring allowing the plunger valve to "bounce" on the piston.
 
orren

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I would like to see someone try back cutting the three notches in spring retainer; even if
things get a little too wobbly the over bend in the clip's three prongs would still hold enough
especially with these new heavy duty clips.

Comments ???



rustystud said:
I believe it has more to do with a weak spring allowing the plunger valve to "bounce" on the piston.
Click to expand...
 
rustystud

rustystud

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Floridianson said:
Hope all works well. Would be interesting if the button retainer tabs could be longer and extend under the plunger spring locking it in place instead of a friction fit. As the threads have talked about I believe the clip was designed just to hold the button on long enough to install the Head. With button/plunger installed and always in contact with the tappet it makes no sense why we loose them. Just had a thought on the wear of the button could it wear out enough to allow a gap between the it and the tappet? That meaning if the button clip falls off we need a new clip and button.
Click to expand...
I have come up with a new theory as to why we loose the clips. When the deuce is allowed to set for long periods the old diesel fuel gets gummy and causes the plunger to stick in the bore. Then when you go to start it up, the first time the plunger hits the top of it's bore it sticks and looses contact with the cam piston allowing the clip to fall off. I have found this in several of the injection pumps I tore down.
 
DavidWymore

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rustystud said:
I have come up with a new theory as to why we loose the clips. When the deuce is allowed to set for long periods the old diesel fuel gets gummy and causes the plunger to stick in the bore. Then when you go to start it up, the first time the plunger hits the top of it's bore it sticks and looses contact with the cam piston allowing the clip to fall off. I have found this in several of the injection pumps I tore down.
Click to expand...
Agree. I think that's why mine wouldn't start after sitting 20 years. I recommend soaking with kroil or whatever before startup.

But why do they sometimes fall off when the truck is being driven regularly? Debris in fuel? Chunk of filter media or even fibers maybe could wedge the plunger.
 
rustystud

rustystud

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DavidWymore said:
Maybe the plunger sticks up and the next time the cam comes around, it hits the button on the side and knocks it off.
Click to expand...
That is about the only thing that would do it. Under normal operation, that button never leaves the cam piston. The plunger spring keeps constant pressure on it. So if the plunger sticks or gets sticky and allows the button to loose contact with the piston it could fall off.
 
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