Mcmastercarr inner coolant seal
Mcmastercarr inner coolant seal
I am going to order the rotary aviation kit but as I was researching I noticed a lot of complaints about the inner coolant seals being a pain. Some suggested using the mcmaster carr part #9319k239 for the inner seal. Is this a good option or is there something better? Also keep in mind of price the mcmaster o rings which are only about 40 for an engine.
I installed those very same McMaster-Carr o-rings in my 2nd gen back in 2005 and they have performed very well. The only thing with these seals is that the plastic lining doesn't allow for them to seal perfectly so you will get a tiny bit of leakage into the combustion chamber over time. Nothing bad but, I had to top of my coolant system very month or so. I just considered it continuous water steam cleaning. 
There pretty durable too. One time this engine only had water in the cooling system and my radiator froze over night. I jumped into the vehicle not knowing the rad was frozen because the engine fired up just fine. While on the interstate my temps started getting really high then all of a sudden I had a huge plum of white smoke exit the back. I thought I had blown the coolant seals. The white smoke only lasted a couple seconds and went away. After I pulled over, that's when I discovered that my rad was frozen. The frozen radiator didn't allow for circulation so the water inside the engine started boiling. I left the car and came back later when it warmed up. Added some water and was surprised not to have ANY cooling seal problems. No smoke! The engine ran just fine and has since.
The white smoke turned out to be a combination of things. The boiling water and high water temps caused way too much pressure in the cooling system. The coolant seals themselves acted like a pressure relief valve which is why I had only a moment of white smoke. Once the pressure dropped, the seals where able to properly seal again. The stock coolant seals (though they seal perfect) would have NEVER survived a situation like that. Once the stock seals start leaking, their done.
There pretty durable too. One time this engine only had water in the cooling system and my radiator froze over night. I jumped into the vehicle not knowing the rad was frozen because the engine fired up just fine. While on the interstate my temps started getting really high then all of a sudden I had a huge plum of white smoke exit the back. I thought I had blown the coolant seals. The white smoke only lasted a couple seconds and went away. After I pulled over, that's when I discovered that my rad was frozen. The frozen radiator didn't allow for circulation so the water inside the engine started boiling. I left the car and came back later when it warmed up. Added some water and was surprised not to have ANY cooling seal problems. No smoke! The engine ran just fine and has since.
The white smoke turned out to be a combination of things. The boiling water and high water temps caused way too much pressure in the cooling system. The coolant seals themselves acted like a pressure relief valve which is why I had only a moment of white smoke. Once the pressure dropped, the seals where able to properly seal again. The stock coolant seals (though they seal perfect) would have NEVER survived a situation like that. Once the stock seals start leaking, their done.
Have had them installed since 2008. I did some comparisons between the two in this post: https://www.rx7club.com/showpost.php...5&postcount=70
I haven't had any problems. I had one overheat where temps reached at least 260F. No sign of coolant loss or seal failure.
I haven't had any problems. I had one overheat where temps reached at least 260F. No sign of coolant loss or seal failure.
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ZaqAtaq
New Member RX-7 Technical
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Sep 5, 2015 08:57 PM
