Mercedes Benz repair: fuel leak, banjo bolt, thread sealant

Question
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Followup To
Question -
I have been trying to solve the problem of extremely rough idle and excessive smoking on a 1984 300 SD Benz.  I have replaced all the injectors and by pass hoses, still rough/smoking problem.  Smoothes out at higher rpm but still smokes.  I noticed a small leak around the injector insert (threaded part in the block that holds the injector)between the block and this threaded insert.  Can I fix this by removing and using some thread sealant?  What does it take to remove the insert, special tool?  Thanks.
Answer -
Did you install new heat shield/crush washers on each new injector?

Yes, and I made sure to get the right side up.  Except I did drop one and cuoldn't find it so I reused an old one.  Not on the cyl. that is leaking.






The following links should help.
Especially the last massive one, which is a fifteen year old young man, first car, and major smoke = five acre smoke cloud in moments, every possible issue is covered in depth, at some point.

OM603 ALDA removal instructions
http://www.mercedesshop.com/shopforum/showthread.php3?p=431887#post431887

ALDA R&R disassembly, cleaning.
http://www.mercedesshop.com/shopforum/showthread.php3?p=777546#post777546

Injector testing
http://www.mercedesshop.com/shopforum/showthread.php3?t=131328

Injector R&R thread.
http://www.mercedesshop.com/shopforum/showthread.php3?t=86332&highlight=DIY

I installed my new Injectors and now I need help.... PICS
http://www.mercedesshop.com/shopforum/showthread.php3?p=638976#post638976

OM 603 Injector heat shields
http://www.mercedesshop.com/shopforum/showthread.php3?p=622159#post622159

Leak near injectors - '85 300D T
http://www.mercedesshop.com/shopforum/showthread.php3?p=721444#post721444

Banjo Bolt
http://www.mercedesshop.com/shopforum/showthread.php3?p=733935&posted=1#post7339

wont start for anything!
http://www.mercedesshop.com/shopforum/showthread.php3?t=104222&page=41&pp=20


PART NUMBER SEARCH RESULTS WITH PRICES
Vehicle 1984 Mercedes Benz 300SD
Part: Injector Heat Shield
 Note:  7.5mm orifice
D1010-21025 Injector Heat Shield Goetze IN STOCK $2.35  

http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=merc

Answer
Thread sealer can NOT be used.
Never reuse heat shield/crush washers.
The leaking injector may have a flawed or flipped over heat shield/crush washer.
Remove the leaking injector, install another new heat shield/crush washer, and be sure to torque the injector to 70-80 N-m (which is 51-60 foot pound).