170k on this 1992 2.5 turbo (OM602)... last week it started smoking white/grey out the pipes and knocking. It isn't black or blue. It burns the eyes. I'm talking smoke like I'm doing a tire burnout!

Anyway, I was due to put in new injectors anyway so I had Monark nozzles put into my injectors by a Bosch certified shop. Prechambers looked fine and had the ball inside still. Torqued the injectors back to 59 ft lbs and had new brass crush washer in (the correct orientation too). It made no change.

I have no water on the dipstick, and no oil in my coolant reservoir.

Any ideas? One shop looked at it and the knock and smoke and said it seems like something internal. They didn't want to touch it. Another shop just by a discussion with them said perhaps a hole in the piston? They also said that a head gasket replacement would be more expensive than the motor they have lying around with 210k miles on it. It has had the top end replaced and has rebuilt valves, seats, etc. Expensive, but heck most people have $450 a month car payments and this would pay for it in like 3 months.

Only thing I did was the day before this happened put some Lucas injector cleaner in. I have flushed the tank and run it on new diesel, no change.

Perhaps I can get a video with sound of it running and throw a Youtube link on here, but with the knock and smoke I hate to run it for long. It's 75 degrees here now so everyone's got their windows open in the neighborhood and I can't crack one injector open at a time while this thing smokes my street.

A vacuum pump was installed by a shop 2 weeks prior. The grommet for the stop lever was replaced, and of course injectors. Also, a little 2 inch vacuum line was replaced (the one that goes into the top of the white plastic stop valve) with a slighter smaller diameter hose.

Any ideas? Can't they do a compression test and put a scope inside the prechamber holes to look at the pistons, etc?