The Lisle funnel is an amazing tool to bleed air from a cars cooling system. It comes with several attachments so it can fit almost any radiator.

But none of the attachments fit the popular aftermarket Koyo aluminum radiator for our cars. But I found a workaround.

This is the Lisle attachment that is closest to fitting:



But notice that by itself it sits too low for the cap attachment to fit: (shoulder that Lisle cap attachment is supposed to press down on to seal sits is well below top of filler neck)


Yes, its a Koyo radiator. I painted it black.

The workaround is to take the gaskets off two of the other attachments, the smallest available: (use all these pieces. This yellow fitting, this cap attachment, the two additional gaskets borrowed from the other yellow fittings)



Put those other two gaskets in first, then the yellow piece. Now it shoulder sits higher than filler neck, so cap attachment is going to work:



Cap attachment installed:



Funnel installed: (doesn't leak despite the tripled up gaskets)



The larger of the two gaskets barely fits, so when its time to remove, you'll need a pick tool to get it out, as its too slippery when wet for your fingers:

 

nice write up. done this a few times but not as obvious to some.

 

When its your project car, you often want to take advantage of 'while you're in there...', and making everything just so, then things take way longer than they would on a car that's just a car. The result is its often a long day and we're tired by the time we get to the last parts of the task.

Often then not as easy to think straight and see the obvious. I think even just knowing ahead of time you can make this work would be helpful. One more tool in the aresenal.

 

use to be that way, now i have my own garage, i can have projects last a few weeks. my roll bar was 2-3 weeks on and off,

 

I picked one up a few years ago (the funnel) anticipating changing the S coolant. It took a few years before I actually performed the task. I tore off the cellophane and discovered they gave me 2 of one kind of adapter and none of the ones that fit the Honda OEM radiator.

Oh well.

 

Buy a new one, return the old, unused one?

 

Odd. The kit I got from Amazon had more than 2 adapters. One fit fine. They must have sent you an incomplete kit.

 

yeah mine came with a pile of adaptors including the one that fits our OEM radiator. I think that must have been an incomplete kit

 

They did. Got 2 of one adapter instead of one of five. It had been 3 years or so. Gave up. Changed the coolant without it following Billman's advice so it is unlikely I will ever need that one very small adapter again!

 

The popular EP Auto on on Amazon works with the Koyorad using a combination of gaskets as well.

Take the gasket off the red attachment and squeeze it into the radiator fill hole > use the blue attachment on top of that > and use the green cap. I had no leaks.