Is this pinion as bad as I think it is?

[superj]

That looks like a slinger. Can you put it on a piece of wood and straighten it with a ball peen by tapping it out?

 

[JPNinPA]

Okay got the opinion out. It didn't take much effort for my impact to pull off that pinion nut.

To my untrained eye, the pinion gear itself looks good but the bearing and races looks cooked

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Yep. Thats your pinion opinion.



Never look down on anyone unless you are helping them up - Jesse Jackson

 

[TerryMason]

Things were going good today for a while, I had my backlash dialed into 10,000s and everything looked good. I decided to run a pattern before I buttoned everything up. From what I gather this is a pretty bad pattern. I applied way too much of the paint but the drive side looks pretty bad.

I'm not sure if I need to change the backlash by removing carrier shims or if I need to change the pinion shim. I'm open to any ideas.

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[TerryMason]

I'm trying to decide if it this scenario is the green or the blue.

I tried to shortcut things, and just went full send with a crush sleeve, locktite, etc. I assumed that since I was just changing the two pinion bearing and races I'd be fine. Now I need to pull it apart.

I'll try moving the carrier shims first, and if that doesn't change things the I'll pull the pinion gear out and change it's shims.

 

[superj]

I would say you got the blue outlined marks

 

[JPNinPA]

Here is a diagram… if it helps.




Never look down on anyone unless you are helping them up - Jesse Jackson

 

[JPNinPA]

And i was thinking green. From the coast side looks thin and deep towards the center and wider to the outside.

Im no expert on this.


Never look down on anyone unless you are helping them up - Jesse Jackson

 

[TerryMason]

I'm still plugging away at this. Definitely learning a lot from this process.

I think I've got the carrier shims dialed in and I'm clocking about 9 thousands of backlash which is good.

I went ahead and made set up bearings which entails hollowing out the same brand Pinion bearing that I will eventually use. That way I can change the pinion shim without having to press on and ruin the bearing every time.

I think my latest set of marks indicate that I still need a thinner pinion shim.

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[TerryMason]

This is what I'm getting with a 0.010 inch pinion shim

Coast side

And drive side

Leaving this here mainly so I can keep track of which shims look best


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[TerryMason]

0.012 inch pinion shim

Coast side

Drive side

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[TerryMason]

Pinion shim of 0.023 (this was the factory shim)
This much of a change ended up changing my backlash to about 0.05, and it should be between 8 and 12. I ran the patterns anyway just to see what they look like


Drive side

And Coast side

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[TerryMason]

Pinion shims of 0.030

This gave me zero backlash which will have to be fixed, but I think the patterns look better overall.

Coast side

And drive side

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[JPNinPA]

If i interpret the pattern diagram the left side marked drive side has the center of the ring gear to the right and outer to the left. You are looking at the pattern of the retrograde angle or backside of the teeth.
In the diagram right side marked coast side, the center of the ring is to the left and outer to the right. Here you are looking at the sloped side of the teeth.
Being the top row of the chart is desired. The marks should be centered and somewhat rectangular.

If correct 0.010 and 0.012 are like row 4.
0.23 looks close
0.30 looks like row 3


Again im no expert. Have you considered reaching out to currie enterprise?? They may be able to provide sound advice maybe even face-time or teams to review your pics…


Never look down on anyone unless you are helping them up - Jesse Jackson

 

[TerryMason]

I'll agree that 23 looked good, but only on the coast side. From what I read, I should focus on the drive side primarily.

I think I'm on the right track now. This time around I kept the 0.030 pinion, but went back to the factory carrier shims. These are way too loose and my backlash was only five, but I think the pattern is on the right track now.

Now I think I'll play around with the carrier shims, adding a bit more on the left / driver in order to increase the backlash.

Pinion shims : 0.030

Coast side

Drive side

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