So I know this topic has come up, and I found a few threads about it but having trouble finding good information. I took my 1984 300td wagon into the shop, and the mechanic has diagnosed that the problem is at the very least coming from the bottom of the engine. I know once he has to go that deep into it can easily top $1,000, so I'm starting to look into the possibility of rebuilding the engine. I don't mind putting the car out of commission for a few months, and I don't mind getting my hands dirty. Have done the normal maintenance like valve adjustments and vacuum system troubleshooting, is it a terrible idea for me to take on the rebuild myself? Aside from the expense and difficulty of having a machine shop rebore piston sleeves, with the right manuals and guidance is it something I could pull off? Are there any the websites, books, or videos that provide some guidance?