NP231 Tools Required For Rebuild - Types and Sizes

Hello folks,

Well after a fruitless search here and the net, I am still at a loss for What Size and Type Tools I will need for an NP231 rebuild.

I have a good selection of tools in my garage, but I have seen references to needing a 28mm deep socket, 10mm 12 point socket, oil seal puller and of snap ring pliers (in and out?).

Can someone in the know please enlighten me exactly what I will need?

I have named this thread so the next person searching for it can find these postings too! Thank you.

I don't remember needing a socket that size, 28mm. If you have a good selection then you'll be fine. A bearing puller would be beneficial. Specifically a pilot bearing puller. So that and the snap ring pliers are the only special tools. Look up some of the 242 rebuild threads. Can't be that different

1990JEEPXJ said:

I don't remember needing a socket that size, 28mm. If you have a good selection then you'll be fine. A bearing puller would be beneficial. Specifically a pilot bearing puller. So that and the snap ring pliers are the only special tools. Look up some of the 242 rebuild threads. Can't be that different

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Thanks for the info - well the new rear yoke nut is smaller than 1 1/8" and bigger than 1 1/16" and too big for my 27mm - that was where I was thinking 28mm. I have the FSM but it only lists special tools, not whatever shop tools are used. Since I want to torque everything to spec I was trying to avoid having it apart and needing to go get a tool!

The only special tools you'll need are ring pliers. You'll need the kind with flat jaws for spreading a ring (like this), and another for internal/external snap-rings (like these).

ehall said:

The only special tools you'll need are ring pliers. You'll need the kind with flat jaws for spreading a ring (like this), and another for internal/external snap-rings (like these).

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Ahh, I have the second one actually, but not a beefy set like the first, I'll remedy that. Thank you! :star:

I used an 1/18" on my yoke nuts

a seal puller is handy, but not do or die.

an impact gun makes the yoke nuts easy

snap ring pliers are a must (in and out)

a little RTV and some brake-clean and thats it

FYI, I used electrical tape to cover the snap ring groove on the main shaft so I could drive the seal past it without folding it over...took me a couple tries to figure that one out.

rockclimber said:

I used an 1/18" on my yoke nuts

FYI, I used electrical tape to cover the snap ring groove on the main shaft so I could drive the seal past it without folding it over...took me a couple tries to figure that one out.

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Whoa a couple of sweet tips there, Thanks!