I have a leaking injector(#2) where the two injector parts screw together. Can I try to tighten the halves by tightening the top halve while the injector is still in the engine block. I would first loosen the fuel line. Any down side to try this before pulling the injector?

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Paul 1987 300 SDL; 2000 ML; '69 MGB; '68 VW Fastback

I strongly recommend attempting to get a wrench on both halves before attempting to tighten it up.

first though, I would verify it is leaking, and not just the return lines. sometimes it's hard to tell.

if you are sure it's the halves, be GENTLE with it! only tighten it SLIGHTLY. if it does not seal up, the body needs to be lapped for flatness, and reinstalled. this will require a new heat shield.

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

I would remove the injector before doing this.

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CENSORED due to not family friendly words

If you remove the Injector look for a hariline crack on the lower half. It seldom happens but looking is easy.

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84 300D, 82 Volvo 244Gl Diesel

Tightened the injector while still in the head, top half maybe moved 1/16 of an inch. About 90+ percent of the leak stopped. I can live with that. So far so good after about 2 months driving. Best thing is there is no diesel fuel odor.

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Paul 1987 300 SDL; 2000 ML; '69 MGB; '68 VW Fastback

I think unscrewing a Bosch injector from the head is fundamental..(outside on the bench).Once there, all can can fully clean and or rebuild the injector! WARNING: India made rebuild parts....are inferior...really terrible...really.....bad...but today...there are no choices...Bosch no longer make them, and the aftermarket India-made....are worse than if you just clean and replace!