It is quite involved to rebuild these diesel engines and the parts cost much more than say a U.S. small block. New turbo pistons cost ~$500 each, so most go with a used set. When my 1985 engine failed at 330K, I found a used engine on craigslist for $300. I was taking a chance, but lucked out. In my car now, and I see no blowby at all. The cam looks new. I made a stab at rebuilding my 85 engine, mostly for fun. So far I installed new cylinder liners (see post), a step which few have conquered. Haven't taken the block in for machine work yet.