CSF Radiator Drain Plug Extension

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Dec 22, 2020
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Has anyone found a pipe to extend the drain plug on a CSF radiator?

I installed a new one in my 1968 FJ40, and the plug is quite hidden up in the frame.

It appears the thread is a 11 mm by 1.75, just a guess. 1/4 pipe is too large, 1/8 too small, 7/16 - 14 too large.

I rang up CSF, I was told they do not have any technical information, drawings, etc. They would not provide it even if they did as I am a retail customer and they only work with sellers. Seems to me CSF doesn't manufacture, just import and distribute.

The rep. suggested I contact the supplier I purchased from, which I did and they stated they only sell, no technical info.

So if anyone has installed an extension on theirs, I would appreciate the specifics.
 

middlecalf

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Not sure if @ToyotaMatt ’s extension will fit, he can give his specs.
 

GA Architect

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Has anyone found a pipe to extend the drain plug on a CSF radiator?

I installed a new one in my 1968 FJ40, and the plug is quite hidden up in the frame.

It appears the thread is a 11 mm by 1.75, just a guess. 1/4 pipe is too large, 1/8 too small, 7/16 - 14 too large.

I rang up CSF, I was told they do not have any technical information, drawings, etc. They would not provide it even if they did as I am a retail customer and they only work with sellers. Seems to me CSF doesn't manufacture, just import and distribute.

The rep. suggested I contact the supplier I purchased from, which I did and they stated they only sell, no technical info.

So if anyone has installed an extension on theirs, I would appreciate the specifics.
FWIW - last year I installed a new CSF 2888 radiator that had a plastic drain plug. I removed the plug and installed a homemade extended drain line. The plastic plug that CSF uses is a M10x1.5 unit.
 

Skreddy

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I copied GA Architect but haven’t put it in yet. Before installing, I did get a generic m10x1.5 metal drain plug from the auto parts store because I just didn’t trust that plastic one it came with.
 
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When I get out to the shop, I will try a 10 mm bolt. I thought I measured the threads at 1.75 pitch, but will redo when the temps get warmer and I heat the shop.

I tried a 3/8 bolt and it slipped right in. But 3/8 is slightly smaller than 10 mm, so will try a 10 mm. Thanks.
 

GA Architect

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The 50 mm extension looks like what I was thinking. I just need to verify the radiator thread size and pitch.
 

GA Architect

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Here is a good thread about this very subject:


See post #13 & #14
 

GA Architect

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FWIW - Here is my petcock extension & parts I used for my CSF 2888 radiator:

1. Fragola 460410-BL 4AN to 10MM x 1.5 adapter
2. (2) Fragola Pro-Flow AN Hose End -4AN
3. Fragola 480604-BL 4AN Flare Plug
4. Fragola Black Braided Pro-Flow AN Hose -4AN

IMG_8499.jpg


IMG_8503.jpg
 

pbgbottle

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Man I think I just went with the plastic plug that came with it.
 
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Man I think I just went with the plastic plug that came with it.

But when you pull that plug, it will create an epic mess under the truck, as coolant goes everywhere.
 

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