FL5 Coolant Reservoir Leak

[timestamped]

Just a PSA to rinse out a coolant expansion tank before installing, I think these are styrofoam fibers that worked their way in during shipping:

Sponsored

 

[evlsmurf]

Just to confirm, the Mishimoto expansion tank is the same for the FL5 that fits the FK8. Mishimoto could not confirm it fit, which is odd.

 

[timestamped]

I used a flashlight and mirror to see the coolant level reach the sight glass while pouring:

 

[earfejj]

Dang! I just hit 1000 miles. I wonder if there is anything that you can do before hand to prevent this from happening? I wonder if it's from vibration or just a crappy seam?

From what I understand, it's a manufacturer defect but who really knows. I had it replaced and am now at 6500 miles with no issues.

 

[TW00Si]

So far the radium tank with hondabond is holding up. After one track day, no leaks.

 

[Jester04]

So far the radium tank with hondabond is holding up. After one track day, no leaks.

That thing will never fail. The hondabond you placed that day can never be undone.

 

[ToddR]

I'm not really interested in the Mishi tank, so I'm considering the Radium or the new 27Won expansion tank.

I'm familiar with Radium, but not 27Won as a manufacturer. About the same price; which would you choose?
https://store.27won.com/upgraded-coolant-expansion-tank.html

 

[TW00Si]

That thing will never fail. The hondabond you placed that day can never be undone.

Yeah I hope not. So far each time I check under the hood, no blue coloration on the hood or anywhere on/near the tank. I didn’t think I put too much but clearly I put too much when I had to scrape off from the inside. Thanks again for telling me to do that.

 

[Jester04]

Yeah I hope not. So far each time I check under the hood, no blue coloration on the hood or anywhere on/near the tank. I didn’t think I put too much but clearly I put too much when I had to scrape off from the inside. Thanks again for telling me to do that.

That is what we are here for my friend! And thank you for everything!

 

[pigfacedalarm]

I'm not really interested in the Mishi tank, so I'm considering the Radium or the new 27Won expansion tank.

I'm familiar with Radium, but not 27Won as a manufacturer. About the same price; which would you choose?
https://store.27won.com/upgraded-coolant-expansion-tank.html

27Won. It’s a solid single piece, radium is two pieces and prone to leaking at the seal unless you use RTV sealant. 27Won is a big Honda vendor- I have their rear motor mount and it’s a perfectly machined piece.

 

[fenix-silver]

27Won. It’s a solid single piece, radium is two pieces and prone to leaking at the seal unless you use RTV sealant. 27Won is a big Honda vendor- I have their rear motor mount and it’s a perfectly machined piece.

yeah, 27won usually puts out some top-notch stuff. had their exhaust on my 10th gen Si and the build quality was superb

 

[katch922]

Why not mishi? It’s a solid piece, I have no issues with mine. I wouldn’t go with radium, either mishimoto or 27won.

 

[Doskiller]

Peeps seem to worry about the sight glass leaking. Here's a thought ........ just don't fill it up all the way to the sight glass in the first place if nervous ................ ;-)

 

[evlsmurf]

Peeps seem to worry about the sight glass leaking. Here's a thought ........ just don't fill it up all the way to the sight glass in the first place if nervous ................ ;-)

Have there been issues with the glass leaking?

 

[TW00Si]

Have there been issues with the glass leaking?

Not sure. Mine hasn’t. And it’s filled halfway. The threads comes pretreated. I have not seen any leaks so far. It was my concern with the radium tank. But seeing how you can use sealant on it, I was willing to take chance since I didn’t like the looks of the other options currently available.

Sponsored