I just got my engine back from the machine shop, but I’m going out of town for a few weeks. I was thinking on soaking every thing with WD40 before I leave so it won’t rust. Will the WD40 harm anything?

 

It would be fine, but it's probably already pretty well oiled up from the shop.

 

not a big deal

but if its going to get wet or something somehow then wipe the cylinders with engine oil and cover it up

it will be fine

 

Got back, got sick, and had a bad allergic reaction to the medicine the doctor gave me so I have been sick for along time. Also monsoons have started here and the air is very humid but none of the parts but the cam have been in water. Yesterday I finally got to start working on the engine and I noticed some small dark spots on the cylinder walls, not many and they are very small. I did whip oil in them before I left. I also sprayed the crank down with WD-40 but I see very, very small dark spots on the journals. Now the cam, this rust was rough to the touch but really wasn’t too bad but, I sanded off the rust spots on the cam and got it smooth to the touch and you can still see where the rust was is that going to be a problem? Also what should I do about the crank and cylinder walls? The spots are not rough to the touch. I have an idea of sanding off the spots with the very fine grit sand paper but I don’t know if that would cause a worse problem. So I decided to ask here first. Sorry for the long post...

 

Bump.

 

I wouldn't worry about rust stains, and most sandpaper is not a very good thing to use on a cam journal or a cylinder wall. Maybe 1200/1500 grit would be ok, still I'd be very careful when using it.