05-13-2026, 05:40 AM
Mark, thanks for that info.
Seriously, Thanks! You helped me gain an understanding of a long journey I had with the yanmar/kohler genset in coach 512. I won’t drag everyone through the story, but after years of inability to cure a smoking generator, the solution was to replace the valves and valves seats. Years of carbon buildup had pitted the valves and seats beyond lapping. I always thought the gen ran cold, but the tstat was stamped 160 and the engine ran at 160. I never cross referenced the Kohler number to the tstat installed.
In reflection, I remember that Tuga, a previous owner, complained about the gen running hot. I never had that issue. Apparently one of the solutions was to put in a lower temp tstat.
The long term problem that caused was the engine would load up with carbon.
Thank you again. I will reach out to the new caretakers of 512 with this info.
Seriously, Thanks! You helped me gain an understanding of a long journey I had with the yanmar/kohler genset in coach 512. I won’t drag everyone through the story, but after years of inability to cure a smoking generator, the solution was to replace the valves and valves seats. Years of carbon buildup had pitted the valves and seats beyond lapping. I always thought the gen ran cold, but the tstat was stamped 160 and the engine ran at 160. I never cross referenced the Kohler number to the tstat installed.
In reflection, I remember that Tuga, a previous owner, complained about the gen running hot. I never had that issue. Apparently one of the solutions was to put in a lower temp tstat.
The long term problem that caused was the engine would load up with carbon.
Thank you again. I will reach out to the new caretakers of 512 with this info.
Richard and Rhonda Entrekin
95 Newell, 390 Ex caretaker
99 Newell, 512 Ex caretaker
07 Prevost Marathon, 1025
Maverick Hybrid Toad
Inverness, FL (when we're home
)