Fixing 9" Ford Pinion Leaks: - Ford Muscle Forums : Ford Muscle Cars Tech Forum
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post #1 of 5 (permalink) Old 03-31-2009, 05:28 PM Thread Starter
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Fixing 9" Ford Pinion Leaks:

Nothing is more annoying than a nasty oil spot on your clean driveway or garage floor. In this case a newly rebuilt 9" centersection in our project Bronco started seeping oil almost as soon as it was filled with oil.

Here is the annoying spot on the shop floor:

A little investigating led me to determine the oil was leaking out of the pinion or seal area:

I started the process by removing the pinion nut using my 18 volt Craftsman cordless impact wrench. If you have never used a cordless impact wrench, you are missing out because I cannot live without mine:

I had replaced the pinion seal, but I re-used the pinion yoke even though there were a few small grooves in it. It was most likely the culprit. A call to Randy's Ring & Pinion got me a new yoke, pinion seal, and pinion nut. There are repair sleeves for the yokes, but they are only $5.00 cheaper than a whole new yoke, which cost me about $50.00:

I cleaned the splines on the pinion with some brake cleaner to remove any remaining oil:

I next smeared some silicone on the inside of the yoke as I have seen the yokes leak through the splines:

I did the same on the pinion nut:

Some bearing grease was smeared on the sealing surface of the yoke to keep the seal from burning up from being dry:

I didn't replace the pinion seal because it had just been replaced, and the vehicle did not run at all. I placed the yoke back on the pinion and seated it as far as it would go by pushing on it:

The pinion nut was then replaced and threaded on by hand:

There are different ways of making sure that the pinion bearing has the correct amount of pre-load such as counting threads, or turns of the pinion nut. I have a different method: While tightening the pinion nut with the impact wrench, I pull on the yoke to see if there is any play on the assembly. I slowly keep tightening the nut until a slight amount of resistance is felt, and then I go 1/16th of a turn more which is the correct amount of pre-load on the pinion bearing. The cordless impact WILL NOT crush the crush sleeve any further than it is. I have used this method on dozens and dozens of 9" centersections and I have never had one fail yet:

The best part of the whole process is the clean floor.

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Last edited by F15Falcon; 03-31-2009 at 08:12 PM.
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post #2 of 5 (permalink) Old 04-01-2009, 03:02 AM
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Re: Fixing 9" Ford Pinion Leaks:

I've successfully used this method many times too with no ill effects (although most recommend not to do it without a new crush sleeve.) Glad that you mentioned the silicone on the splines as I found that to be a problem also.

Now when I rebuild a 9", I use shim washers instead of the crush sleeve and really don't need to worry about crush when doing the above repair.


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post #3 of 5 (permalink) Old 04-01-2009, 05:55 PM
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Re: Fixing 9" Ford Pinion Leaks:

Great, thanks! Didnt know you could do this without pulling the pinion and replacing the crush sleeve.
Mine was leaking through the pinion nut I thought, must have been the splines. Needed rebuilding anyway, hope it doesnt leak now, but if it does I can fix it.

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post #4 of 5 (permalink) Old 04-01-2009, 06:51 PM
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Re: Fixing 9" Ford Pinion Leaks:

Very cool!

Colin Pittsburgh PA
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post #5 of 5 (permalink) Old 02-23-2010, 08:18 AM
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Re: Fixing 9" Ford Pinion Leaks:

Great post. Thanks

I got a buddy who has a leaking pinion. Going to have to give this a try.


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