Thread size of rear diff breather? - Subaru Forester Owners Forum
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post #1 of 10 (permalink) Old 07-18-2006, 01:31 PM Thread Starter
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Thread size of rear diff breather?

I figure that somebody here must have a rear differential sitting around on a workbench. If so, could you measure the thread size for the little breather that is mounted on top of the diff housing?

The breather looks like a small thimble on top, with a hex base for using a wrench on it. I'm guessing it is a tapered pipe thread, but I need to know the thread size.

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post #2 of 10 (permalink) Old 07-18-2006, 03:36 PM
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My old breather is at home - it's a plastic piece that is pushed in; no thread at all. I can measure it tonight.

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post #3 of 10 (permalink) Old 07-18-2006, 04:38 PM Thread Starter
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Hmm, that would be good. Could you take a photo? When I was feeling around it, there seemed to be a hex portion at the base (like on a Toyota Tacoma, nee Hilux), but it was difficult to tell.

Here is what a Tacoma breather looks like:
http://www.wattora.com/mods/diffbreather/
The "union" is also available with a 90* angle, so I was hoping that would fit. But it won't if the Subie is a push-in style.

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post #4 of 10 (permalink) Old 07-18-2006, 07:24 PM
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Yep - I'll post a pic as well. When I installed my extended breather I used a rubber sleeve from a steam iron lead - you know - used where the electric lead attaches to the iron.

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post #5 of 10 (permalink) Old 07-18-2006, 08:18 PM
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yall goin swimming wit the forester or somthin?

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post #6 of 10 (permalink) Old 07-19-2006, 04:12 AM
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Originally Posted by BenMara
yall goin swimming wit the forester or somthin?
Absolutely!
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post #7 of 10 (permalink) Old 07-19-2006, 04:15 AM
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Breather

Here it is MB (pic is upsidedown):

The top (cap) section is 17mm diameter & 12mm high

The middle section is 14mm diameter and 7mm high

The end section is 12mm diameter and 8 mm high

The clips are 3 mm long

Gives a total length of 30 mm

The inside is hollow
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post #8 of 10 (permalink) Old 07-19-2006, 07:57 AM Thread Starter
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Thanks Kevin!

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post #9 of 10 (permalink) Old 07-22-2006, 08:06 PM
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So kevin, did you just attach the new "fitting" onto the stock brether (minus the cap) or did you stick the new hose into the diff.

I am thinking of just buying some fuel line and ataching it to the stock breather with a hose clamp. Of course I would take the cap off. Where did you run your extension to?

Hi to everyon by the way. Its my first post, I own a outback. I have a snorkel in the making and plan on adding a extension to my diff. Then I am going swimming.

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post #10 of 10 (permalink) Old 07-23-2006, 04:26 AM
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Welcome to the forum fnlyfnd.

The "cap" doesn't come off. I pulled the OEM out and inserted the tapered rubber electric lead tube (with its small end cut at an angle) into the diff breather hole. It's a good tight fit. Out the end I used some plastic tubing and ran it into the cabin - there's a rubber plug just to the RH side at the front of the spare wheel near the strut tower. Then up inside the strut tower covering and into the rear quarter panel upper frame. The insert into the diff I cut to probably about 40mm / 2 in

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