How can you check the holes of the prechamber with out removing it from the head?

gomerbarkley- you really should pop test when you install new nozzles. I have only ever seen one set that did not need any shimming after a rebuild. The odds are at least one injector will not be popping at the correct pressure after the set is rebuilt.

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine

It might be possible to check the holes in the prechamber with a Bore Scope but they cost>$200 and I have no idea if the can even be rented.

However, you can look at the Ball Pins and see if they are OK.

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84 300D, 82 Volvo 244Gl Diesel