Engine Descaler

[satellite]

I am getting ready to flush my engine with a descaling agent with a closed loop circulation pump set up. I understand that some newer engines with flush ports do not require you to remove the thermostat in order to ensure complete solution penetration throughout engine. However I am wondering if I should remove thermostat during the process. Or maybe it is not necessary. I wil not be running the engine during this process. Any input would be greatly appreciated. 2007 DF150 490 hrs.

Mark

[Solarman]

If not running the motor, thermostat would stay closed, possibly causing flush to miss some areas. Yes, remove t'stat to let fluid flow freely throughout the block.

Good luck.

[satellite]

thanks so much for your reply. I will post pics of process and results. Have not had any overheating issues, however i live in southwest florida. I only have well water to flush with, which is loaded with calcium and salt. Not the best option for engine flush. So this is pretty much a maintenance precaution.

[ChrigelKarrer]

As long you don't have problems with overheating or clogged water passages i would not use preventive descaling agent or stuff like this.
There are millions of outboards they get flushed with questionable (dirty flush tanks at dealerships for example) fresh water once a year and they are fine.
Use the flush port and you don't need to have the engine running.
Chris