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Old 05-31-09, 09:32 AM   #1
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Koyo radiator drain plug replacement
Hi guys,

I broke the drain plug on my koyo radiator for an S4. I'm looking for a replacement. Do you know where I can find these? I have done all local part store and I was not able to find it. I have searched the forum and someone told that the stock S5/FD drain plug should fit but he didn't seem to be sure. Can someone confirm this?

Thanks
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Old 05-31-09, 11:04 AM   #2
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The used Koyo I bought for my FD came with no plug, so I used the one out of my stock radiator.

That was an FD radiator, though...give it a try anyway!
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Old 05-31-09, 11:35 AM   #3
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stock one should work.
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Old 05-31-09, 02:28 PM   #4
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btw- auto zone told me it was a dealer only item
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Old 05-31-09, 03:06 PM   #5
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as far as I know, all koyo radiators re use all stock parts. so just try stock plugs
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Old 05-31-09, 04:17 PM   #6
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Thanks guys.

Do you know if s4 and s5 plugs are the same?
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Old 05-31-09, 05:51 PM   #7
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The drain plug on my koyo is m10x1.25, but its the u-flow model.

Not sure if s4 and s5's are the same.
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Old 05-31-09, 06:01 PM   #8
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I got my replacement at bennett auto supply it is just like the one it comes with koyo
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Old 05-31-09, 06:07 PM   #9
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a brass plug would be good, this plastic plug sucks

I just ordered 2 replacements, now I will keep track and after I remove it a few times im going to change it out
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Old 06-02-09, 07:36 PM   #10
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N326-15-203 does not fit my Koyo, I ordered one from Mazdatrix on Sunday and one picked one up from my local dealer today because I could not wait, they are too large!

I ended up with a 10x1.5mm bolt for now.
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Old 06-02-09, 08:08 PM   #11
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The new Koyos come with aluminum drain plugs (or at least mine did). But I haven't seen any place that will sell just the plug by itself.
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Old 06-02-09, 08:59 PM   #12
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*****, I wil find one, this I vow
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Old 06-02-09, 08:59 PM
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10x125, 1993, 93, archives, drain, drainage, fd, koyo, oldsmobile, petcock, plug, radiator, replacement, replacements, rx7

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