Hi-
Got my 1960 190 diesel running. I replaced the injectors with Monark injectors. the Kit came with heat shields. I put them in and torqued to 60 pounds. Started up and the injector cavity of the head has diesel in it.
My question is - are the Monark steel heat shields the right part?
I read the early mercedes used copper heat shields or seals.
anyone got any ideas? Thanks Angus

I think there might be some missing info.

Are the replaced monarks whole new Injectors or did you only swap new Monark Injector Nozzles into your Injectors?

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84 300D, 82 Volvo 244Gl Diesel

More questions. When the Injector is installed on top of them is there a Brass Banjo held on by a Nut that the injector fuel return goes through and then the Fuel Injection Hard Line goes on after that?


At this site at the very bottom of the site is a pic of the Engine and you can see one Injector at the rear of the Engine. Do your Injectors look like the one pictured or do your Injectors use rubber hose on all of the fuel return Lines?


1953 to 1962 Mercedes-Benz 120 and 121 series

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84 300D, 82 Volvo 244Gl Diesel

Yes, they are.

Hi -
Thanks for answering. Sorry about the lack of info. The new Monark injector nozzles are fit into my existing Bosch injector housings. My engine is about a 1958 model with the brass "banjo" fittings for the return lines. (Not the newer method of return lines through rubber hoses). I don't see any leakage from the body of my housings. When I fit the new nozzles into the injector housings, I was pretty careful about cleaning everything.
I suspect that the steel heat shields or (some call them seal rings) did not compress when installed causing leaking. What do you think? Thanks Angus

60 pound per sq. inch is very untight! (it is approx. 7 Nm).
You should torqed injectors tighter with 70-80 Nm.

He likely meant 60 ft-lbs, which is just over 80 Nm.So the op torqued them fine.

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1968 220D, w115, /8, OM615, Automatic transmission.
My 1987 300TD wagon was sold and my 2003 W210 E320 wagon was totaled (sheds tear).

Just swapping the new Nozzles into used Injectors without lapping the Parts can result in the Injectors leaking about the Nut that holds the new Nozzles on.

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84 300D, 82 Volvo 244Gl Diesel

thanks for the reply- I'll lap the injector housings and let you know how things go. thanks again Angus

http://www.peachparts.com/shopforum/diesel-discussion/385438-diesel-injectors.html#post3701245


There is a part inside that if you do not put it back where it came from correctly when you torque the Injector Nut you break off part of the Nozzle Pintel.
The part listed in the pic as the spring seat is the part and I circled it in red. You should see the wear mark where the spring rubbed on it so you no which way it goes.


The plate with the arrow also has to go a specific direction. The smaller end goes against the Injector Nozzle.


The 2 parts that make up one Injector Nozzle are mated together and should not intermixed with parts from other Nozzlles.

Attached Thumbnails

 

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84 300D, 82 Volvo 244Gl Diesel

Thanks for the picture. I got the parts put together exactly the way you show. I didn't lap the bottom of the threaded surface (as you show) . I found a you tube that shows the lapping ( https://www.youtube.com/watch?v=Ub-2RGeZCag) procedure.
In it the guy basically polishes the bottom surface with 2000 grit abrasive paper and a little oil. What about the bottom surface of the female part? What he shows is not lapping. To lap you need to get some paste compound and screw the two parts together with the compound on the surfaces. This way you can ensure the two surfaces match one another. I don't think the injector housings are made of any exotic materials probably mild steel so lapping should be pretty easy. What do you think? thanks so much for your attention