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  #11  
Old 12th May 2019
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Quote:
Originally Posted by rocketmangb View Post
Cut half the step off the pinion
Cut a step in the pump gear the same
Both gears have a half moon on one side that mate/lock together
The combined pinion and pump gear length would then be too short by the depth of your step cuts. You'd need to add a spacer and to check that you didn't create gear tooth engagement conflicts. Not a bad idea. The short key engagement in the pinion has always looked iffy.
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  #12  
Old 12th May 2019
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Create a step on the pump gear without making it shorter
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  #13  
Old 12th May 2019
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just a ?
what is the end game?
taking the load off the chinchy key?
do not have parts in hand but think out the box
there are a couple of more ways to add security.
i know mr. hippy can come up with one for sure.
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  #14  
Old 12th May 2019
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No pressure intended?

If you cut slots in both the pinion and the oil pump drive gear;
You are in fact locking them together.

That may 'help' just a little.
But the problem as I remember is the key on the pinion shaft is pretty short by the time it runs under the pinion gear.
There will still be that weak point there.

If you pulled the gears off, carefully extended the slot in the pinion shaft with a dremil,
You can install a second key under the pinion gear without the need to lock the gears together..
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  #15  
Old 12th May 2019
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Envision if you will
Oil pump gear x section would be like this "L"
Pinion gear x section would be an "L" rotated 180 degrees counter clockwise
Forming a box so the 2 gears cannot spin independently
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  #16  
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You'd have to add a spacer I'd think.
Cutting the fit would mean shortening both gears.
Then you have to fit the length as to not lose mating gear mesh.
I simply used a grid to create this so it's not scaled.
But it is a good representation of about how much length you'd lose.
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  #17  
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You cut both gears
lay it flat and you see a half moon
You would lose some tooth area on the pump gear
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  #18  
Old 13th May 2019
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Wouldn't you also lose some tooth area on the pinion gear?
You can't half moon it without cutting into some of the pinion gear teeth can you?
That takes away from the mesh at the cam.
That portion moves back against the now shorter pump gear leaving less pinion gear out front.. where the cam walks.

Depends on how deep you cut it to be effective... and affective.
Let's see some pics of the destruction if you try it.

Whatever you do to one gear, you have to do the opposite to the other and at the same equal distance inward.
Just as there is a machined flat surface between the 2 of them now.
So .020" length cut in any direction on 1 gear has to match to a .020" cut in the opposite centrifugal direction on the other gear.
That equates to a .040" loss in total length of the two.
Without a spacer, this loss in length will be seen on the gearcase cover side.

Looking at the wear marks on my old pump gear,
You may have remove or at least chamfer the back teeth on the pinion gear to keep the oil pump away from it.

Last edited by Hippysmack; 13th May 2019 at 00:59..
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Old 13th May 2019
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darn no parts on hand when you need them
hippy's like a pit bull, i believe he has this one latched by the yang-yang. logic prevails.
think out the box and come further out.
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  #20  
Old 13th May 2019
Tomcatt Tomcatt is offline
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Quote:
Originally Posted by Hippysmack View Post
Whatever you do to one gear, you have to do the opposite to the other and at the same equal distance inward.
Just as there is a machined flat surface between the 2 of them now.
So .020" length cut in any direction on 1 gear has to match to a .020" cut in the opposite centrifugal direction on the other gear.
That equates to a .040" loss in total length of the two.
It is confusing but in this example the total loss of length is .020".
A full length section of the first gear sits in the .020" cut out in the second gear.
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