How to clean engine parts covered with black burnt on oil??

[Adoom]

Greenleaf bioclean.
They have changed the label from the one pictured.
I AM AMAZED at how awesome this stuff is!
Some before pistons at the back there.

After soaking for a couple of days.






There are another 4 that I put back in cause there's some black left in the ring groves

[Dell'Orto]

It's pretty amazing stuff huh...expensive way to do it, but it cleans like nothing else I used and doesn't ruin your hands either

[Adoom]

It's pretty amazing stuff huh...expensive way to do it, but it cleans like nothing else I used and doesn't ruin your hands either

Hmmm, I don't think you want to get it on your skin too much. Pretty sure the MSDS said something about "defatting" and "dermatitis". I wore gloves.
I don't know what else I could get for $41 that could get 12 pistons this clean with almost no effort. And I think it's probably still good so I put three sets of rods and the main caps in.

[Dell'Orto]

Oh no I definitely wouldn't soak in it but it doesn't appear as lethal as other chemicals that don't strip oil half as well

[Adoom]

I bought a couple more bottles of this stuff and finally got around to starting on the head last weekend, I just leave the stuff soaking for days and give it a scrub every couple days if the crud is thick.

Here are some cams and cam caps. All of them were black with tar like oil.



The cams quickly started getting some surface rust as soon as I rinsed them in hot water, so they have a bit of clean oil on them in the photos.