S2000 Under The Hood S2000 Technical and Mechanical discussions.

TCT leak even after gasket replacement

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Old Jan 17, 2026 | 11:12 AM
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Default TCT leak even after gasket replacement



Noticed a very small amount of leaking on the bottom side of the OEM TCT where it meets the engine block. No leaking anywhere else but ended up replacing all gaskets just in case. All OEM gasket with of course the exception of the top VTEC solenoid gasket, which I used the Kraken brand one. Oil sensor was also replaced with OEM.

Followed DIYguys tutorial on the TCT and the VTEC solenoids and torqued everything to spec.

The same are is still leaking a little… see the picture for reference.

Could this be a bad TCT? Car drives great and engine runs great otherwise.

Last edited by Yshin123; Jan 17, 2026 at 11:30 AM.
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Old Jan 17, 2026 | 11:29 AM
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Whose TCT is this? (I can't see that surface on mine without removing things.)

-- Chuck
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Old Jan 17, 2026 | 11:30 AM
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Sorry, the this is the stock TCT. Just edited.
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Old Jan 17, 2026 | 12:11 PM
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The OEM TCT is a known failure point. Billman's replacement TCT is seemingly bulletproof and you'll be better off with anyway so I'd try that.

-- Chuck
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Old Jan 17, 2026 | 06:10 PM
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Originally Posted by Yshin123
Could this be a bad TCT? Car drives great and engine runs great otherwise.
The OEM TCT is not a strong team player. Billman makes a terrific TCT that is better than the original. I put his in around 35K miles years ago and have never looked back. Don't even look at Ballade or something else.

https://www.s2ki.com/forums/s2000-un...193325/page67/
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