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Old 11-27-2001, 12:14 PM   #1
skidplatez
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Default Size of the factory option Oil temp drainplug?

I have the Subaru optional Guage pack that includes oil temperature. The temperature is measured through the pan drain plug. Do any of you guys know the actual size of this drain plug. It is a lot bigger than the standard one.

I am currently using a 1 1/16" wrench but I assume it's not quite right since it's not metric. Anybody know for sure?
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Old 11-29-2001, 12:37 AM   #2
Peaty
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I'm using a 1 1/16" too I don't have a metric open end big enough myself. It seems to work fine actually.
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Old 11-29-2001, 12:51 AM   #3
Eric SS
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1 1/16"= 1.0625"
A quick conversion nets that 27mm= 1.06299"
Since 27mm is only .00049 bigger, I'm guess that it is the right size

That wasn;t so hard

Eric
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Old 11-29-2001, 01:33 AM   #4
iodine23
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As it would have it, I replaced my standard plug with a Fumoto valve a few weeks ago. I just tried my standard plug and it fits a 17mm socket.

Measuring the diameter of the threads it looks like I get 2cm or 20mm.

That sounds about right, I think I was looking at a drain plug guide at PepBoys and it said somenewer subies had a 20x1.5 metric drain plug. I think there were a few older ones with 16x1.5, and the newestones weren't listed. But withthis quick measurement and that book, I'd bet that we have a 20x1.5 drain plug.

It sounds like your factory plug head is bigger by quite some margin. I'm guessing the threads are still the same, otherwise you'd need a whole new pan and not just a new plug.
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Old 11-29-2001, 07:11 AM   #5
Peaty
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Quote:
It sounds like your factory plug head is bigger by quite some margin. I'm guessing the threads are still the same, otherwise you'd need a whole new pan and not just a new plug.
You are correct, the head part is bigger to accomidate the thermocouple for the oil temp but the threads are the same.
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Old 11-29-2001, 10:54 AM   #6
skidplatez
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Well that's so close I guess I'll stick with my 1 1/16" !
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Old 11-29-2001, 11:15 AM   #7
iodine23
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Woops, I thought you were looking for the thread specs of the plug, not the head size.
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