OM606 prechamber leak

[mwoodland]

Greetings. I pulled the '95 OM606 apart to clean / pop test injectors, ream the glow plug chambers, and found #6 heat shield burned on the bottom. The prechamber was burned where the heat shield seated. I made a lapping tool from a new heat shield and lapped the seat with 400 grit sandpaper, wet. [IMG][/IMG]
Bottom of heat shield

s983.photobucket.com/user/dcmew074/media/Mobile%20Uploads/image-1.jpg.html][/URL]
Burned Prechamber seating area for heat seal.


After lapping.
If you zoom in, you'll see that the seat cleaned up but the surrounding surface appears to be heat checked.
Should I use or replace? Any BTDT advice would be appreciated.

[Diesel911]

Assuming the Heat Shield was installed properly to begin with and it had previously been torqued down the likely cause of the burned heat shield and other local damage is a dribbling Injector. Instead of the Fuel being sprayed away from the Injector when the Injector dribbles some of the liquid Fuel gets on the Metal Parts and later that Fuel burns right against the Parts and eventually burns that area.
Keeping that in mind the damage is localized and you are fixing your Injectors.

I think that means you would be OK reusing the Pre-combustion Chamber and just see if it leaks or not.

If it does not leak leave it alone. If you like somewhere down the road you can pull the Injector and take a look at the Heat Shield and seating area and see if there is any more damage going on.
Anyway that is what I would do.

If you just don't want to mess with it any more after it is assembled get a good used Prechamber or a new one.

[gsxr]

I had a much worse issue on my OM602 and it sealed fine... yours looks perfect compared to mine!