Please can you speak to Phaisan and discuss this problem with Reinhard?
From the photos, an exhaust valve on cyl #20 has failed (burnt), you can also see additional damage on other areas of the valve and seat.
The deposits on the piston are from the valve / plug.
In my experience, burnt valves can be caused by:
• Cooling problems in the cylinder head (buildup of scale due to incorrect coolant and inhibitors), leading to poor cooling of exhaust valves and overheating
• Deposits in the combustion area, leading to hot spots in the cylinder
• Deposits or damage on the valve seat, preventing correct closing of the valve
• Incorrect valve adjustment
• Excessive valve recession
• Incorrect oil – too low ash content, leading to excessive valve wear
• Incorrect fueling, leading to high exhaust gas temperatures
• Dirty gas mixture, causing wear on seat / valve leading to poor sealing
Once the exhaust valve starts to leak (poor seal), the hot exhaust gases of the combustion process will continuously flow past the valve, creating more and more damage. This causes a larger leak, which increases the problem – leading to a complete failure very quickly…..
The first sign of a problem is elevated exhaust gas temperatures….
I need to provide a report to TBEC, please can you discuss with Reinhard and ask for his opinion and what was observed at site on the 15th?
Do we have any access to the winserver logs?
We should also be very careful of the other cylinders…… would not be surprised to see additional problems on this delightful engine!