Sometimes the engines will develop a very light rusty looking film.

Power Dissolver pretty much eliminates it, removing the light rust.

To make sure there is no scoring of the raceways or ball bearings, you should turn the engine over after the process, and listen/feel for any grittiness. If there is any, the bearings should be changed as they are indeed too rusted and likely scored and pitted by the rust.

However if everything feels smooth, there is no need to. Just carefully check the engine movement.

At worst you'll loose the time spent doing this, but you may just find your engine runs fine without having to do more.


I have a few engines that have been running fine for years now after doing the above, even though I thought the bearings were going to be too rusted to work...

I've been afraid to try Naval Jelly as it is so aggressive attacking rust...