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Clean cylinder-1 piston with coolant loss

Tags: #diagnostics · #unresolved

Symptom pattern. On inspection, the 1st cylinder's piston was clean (no carbon deposits), while the other cylinders showed normal brown/tan deposits. No oil consumption evident at the spark-plug well, no cold-start detonation, exhaust smell normal — but coolant level was dropping. This pattern points toward a head-gasket issue rather than a ring/valve-seal problem specifically on cylinder 112345678910111213141516171819202122232425262728.

Engine context. The engine is Mazda-based (closely related to a Mazda/Ford design) with an aluminum block. The owner reporting this case planned to observe the vehicle through the following spring for a more definitive diagnosis before committing to a repair; this case is unresolved and left open as a diagnostic pattern worth cross-referencing if a similar symptom set (clean single-cylinder piston + coolant loss, no other consumption signs) appears elsewhere.

Sources

This page is compiled from 28 community messages. Every fact carries a numbered reference to its original author and message.

Last updated: 2026-07-24

  1. Валерий (7161884851) · FAW X80 🚘🛠🛞 · 2025-12-14 · original message · ru ↩

  2. Unknown (5265219211) · FAW X80 🚘🛠🛞 · 2025-12-14 · original message · ru ↩

  3. Валерий (7161884851) · FAW X80 🚘🛠🛞 · 2025-12-14 · original message · ru ↩

  4. Валерий (7161884851) · FAW X80 🚘🛠🛞 · 2025-12-14 · original message · ru ↩

  5. Unknown (5265219211) · FAW X80 🚘🛠🛞 · 2025-12-14 · original message · ru ↩

  6. Валерий (7161884851) · FAW X80 🚘🛠🛞 · 2025-12-14 · original message · ru ↩

  7. Валерий (7161884851) · FAW X80 🚘🛠🛞 · 2025-12-14 · original message · ru ↩

  8. Валерий (7161884851) · FAW X80 🚘🛠🛞 · 2025-12-14 · original message · ru ↩

  9. Валерий (7161884851) · FAW X80 🚘🛠🛞 · 2025-12-14 · original message · ru ↩

  10. Unknown (5265219211) · FAW X80 🚘🛠🛞 · 2025-12-14 · original message · ru ↩

  11. Валерий (7161884851) · FAW X80 🚘🛠🛞 · 2025-12-14 · original message · ru ↩

  12. Валерий (7161884851) · FAW X80 🚘🛠🛞 · 2025-12-14 · original message · ru ↩

  13. Unknown (5265219211) · FAW X80 🚘🛠🛞 · 2025-12-14 · original message · ru ↩

  14. Валерий (7161884851) · FAW X80 🚘🛠🛞 · 2025-12-14 · original message · ru ↩

  15. Unknown (5265219211) · FAW X80 🚘🛠🛞 · 2025-12-14 · original message · ru ↩

  16. Unknown (5265219211) · FAW X80 🚘🛠🛞 · 2025-12-14 · original message · ru ↩

  17. Валерий (7161884851) · FAW X80 🚘🛠🛞 · 2025-12-14 · original message · ru ↩

  18. Unknown (5265219211) · FAW X80 🚘🛠🛞 · 2025-12-14 · original message · ru ↩

  19. Валерий (7161884851) · FAW X80 🚘🛠🛞 · 2025-12-14 · original message · ru ↩

  20. Unknown (5265219211) · FAW X80 🚘🛠🛞 · 2025-12-14 · original message · ru ↩

  21. Валерий (7161884851) · FAW X80 🚘🛠🛞 · 2025-12-14 · original message · ru ↩

  22. Валерий (7161884851) · FAW X80 🚘🛠🛞 · 2025-12-14 · original message · ru ↩

  23. Валерий (7161884851) · FAW X80 🚘🛠🛞 · 2025-12-14 · original message · ru ↩

  24. Unknown (5265219211) · FAW X80 🚘🛠🛞 · 2025-12-14 · original message · ru ↩

  25. Unknown (5265219211) · FAW X80 🚘🛠🛞 · 2025-12-14 · original message · ru ↩

  26. Валерий (7161884851) · FAW X80 🚘🛠🛞 · 2025-12-14 · original message · ru ↩

  27. Unknown (5265219211) · FAW X80 🚘🛠🛞 · 2025-12-14 · original message · ru ↩

  28. Валерий (7161884851) · FAW X80 🚘🛠🛞 · 2025-12-14 · original message · ru ↩