Engine "Hot tank" question

I'm afraid hot tanking has went the way of the dinosaur thanks to all the toxic sludge it produces from it eating the cam bearings and anything else not made of iron or steel out of the block. You may try your local diesel truck shops out to see if they have the ZEP hot water jet cabinet cleaner (AKA he giant dishwasher). If you take everything out of the block before taking it to be washed it works very well providing they keep the wash solution on the rich side with the surfactants and degreasers.