Wits' End- 80 Series Inner Seal Overdrive Tool (1 Viewer)

NLXTACY

Wits' End
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Developed by @Tools R Us and @inkpot

Available to order: 80 Series Inner Axle Seal Offset Driver

There is one thing that comes as a right of passage in owning an 80 Series and that is the rebuilding of our front knuckles. Generally speaking its not terribly technical, just messy and takes along time. Especially the first time.

But there can be hiccups along the way that you may not always plan for and generally you find out the hard way when your weekend project starts leaking within 5000 miles. Nothing breaks your heart more.

There are quite a few things that could g wrong but there is one that is often overlooked or just not considered and that is the inner seal that rides along the inner axle shaft that is connected to the birf. The OEM seal has been happily riding in its same spot for 100's of thousands of miles. The problem is that the rubber wiper part of the seal WILL inevitably wear a groove into the axle shaft. In time this means the gear oil will start to leak into the knuckle and basically work past the wiper seal and thus coat the backside of your knuckles in Toyota rustproofing.

There are three ways of fixing this:
• Purchase a new axle shaft from the dealer (or @beno)
• SpeediSleeve
• Underdrive or better yet, OVERDRIVE the inner seal

Why overdrive the seal? Simple. The OEM inner seal as a given width. That width is actually narrower than the cavity its being tapped into. By overdriving the seal you are putting the seal's rubber wiper onto an UNTOUCHED portion of the axle shaft.

Currently the easiest method to install the seal is to use a seal driver which is a hockey puck shape of aluminum which is larger than the seal and basically gives you a perfectly flush seal to the knuckle ball. To underdrive it you just...don't drive it all the way in. The issue is making sure its perfectly straight. To overdrive it you are actually driving the seal further into the knuckle ball. But doing this can be nerve wracking because again...how do you know its going it straight AND is the socket you are using deforming the edges of the seal?

This is where the Overdrive Seal Installation Tool comes in. Not only does it capture the seal by having a dowel that matches the seals inner diameter, but it also has a 2mm shoulder that is designed to fit INSIDE of the knuckle ball to overdrive the inner seal STRAIGHT by 2mm.

Very simple and reliable! Eventually this should be your seal driver tool of choice for the inner axle seal for any knuckle service. Brand new axle shaft? Still use it because you are starting the groove 2mm inboard. As you go thru repeated knuckle rebuilds the new seal location will eventually wear its new groove. Now switch back to a standard "flush" seal install and you are on a virgin spot on the axle shaft. ;)

Inner-Sear-Press-Tool-2mm-rear-sm.png
Inner-Sear-Press-Tool-2mm-sm.png


In this illustration you can see the difference between the typical seal driver tool and the Wits' End overdrive tool. The driver itself is designed to work with either the Harbor Freight or the Lisle hand tool.

Screen Shot 2017-11-14 at 8.20.52 AM.png


The application of the seal works the same way as as seal driver tool.

Screen Shot 2017-11-14 at 8.22.07 AM.png
 
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NLXTACY

Wits' End
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Application of the inner seal stays the same. The seal slides onto the driver and the driver is inserted into the knuckle ball cavity.

Screen Shot 2017-11-14 at 8.21.05 AM.png


With the seal firmly placed into the driver there is no worry about the placement of the seal or of it "walking" while driving it in.

Screen Shot 2017-11-14 at 8.21.18 AM.png


In a typical installation tool the inner seal is set flush creating the same leaking issue.

Screen Shot 2017-11-14 at 8.21.38 AM.png


The new overdrive tool sets the inner axle seal 2mm INSIDE of the face of the knuckle ball taking it AWAY from the groove.

Screen Shot 2017-11-14 at 8.21.47 AM.png


Remove the overdrive tool by just pulling it back out. Can't be easier.

Screen Shot 2017-11-14 at 8.21.59 AM.png
 

NLXTACY

Wits' End
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Very cool! Also, I need to ask you about another new product I sent to my wife for my christmas wish list.

80 Series Useless Cubby Insert-base

I was going to have one of these 3D printed for me but I lost my 3d printer hookups. How is this mounted? What kind of weights/loads can you put on this thing. Is it just tied into the dash?

You still can! Brad made something already but I don't really did the 3D look and I needed different functionality.

Its only tied into the dash using the two existing screws. I have the length set in order to take advantage of the cantilevered design BUT it all still is reliant to the strength of the dash.
 
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You still can! Brad made something already but I don't really did the 3D look and I needed different functionality.

Its only tied into the dash using the two existing screws. I have the length set in order to take advantage of the cantilevered design BUT it all still is reliant to the strength of the dash.

So pretty minimal weights, and stability at the end of a 6 inch noga would be modest. hmm. Still looking for a good use of that spot though and this is pretty close to perfect. As a video guy my life revolves around 1/4 20
 

NLXTACY

Wits' End
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So pretty minimal weights, and stability at the end of a 6 inch noga would be modest. hmm. Still looking for a good use of that spot though and this is pretty close to perfect. As a video guy my life revolves around 1/4 20

Ha! I came from the film industry cameras support side and everything was developed around 1/4-20, 3/8-16, 15mm, 19mm and Panavision 5/8". That was my world :p
 

HDJdreams

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Perfect timing, my 80 is on jackstands to start knuckle rebuild. Pulled draglink this morning. Happy to see original rod ends were still full of grease after 30 years and 250k miles!

When are the front knuckle posters coming back in stock?
 

NLXTACY

Wits' End
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Perfect timing, my 80 is on jackstands to start knuckle rebuild. Pulled draglink this morning. Happy to see original rod ends were still full of grease after 30 years and 250k miles!

When are the front knuckle posters coming back in stock?

I have a couple changes to make to the poster before I remake them. My goal is to send v2 out for production by next Monday.
 

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