Is there a way to bench test an injector pump? Also, is the IP for an '82 300CD different from an '82 300CD Turbo?

If you can fashion a fixture to drive the pump, have a set of injectors connected via the hardlines, you could observe the spray patterns, watch if there are drip problems etc. If you have a set of hardlines to sacrifice, bend them (with heat then clean well) so the injectors can be mounted horizontal, use the starter motor to drive the pump. Anyone see any problems doing this?

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I have quick tested my injectors this way. You want to shoot down (like in the engine) not horiz. I plan on making getting a gauge with a top pressure needle just for this purpose as a cheap DIY pop tester. However, it does put additional wear on all the parts involved...

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the 300CD N/A engine pump is different from the 300CD Turbodiesel pump

Shooting down is better, but shooting horizontal is OK. I was talking about bending a set of injector lines and have all injectors connected to the IP while mounted to the engine. If the lines are long enough and there is sufficient clearance to point the injectors down, do that by all means. If not, then horizontal is fine. At 2000+ psi, the spray pattern is not going to be affected by much whether the injector is horizontal or vertical. Make sure you put a clear jug on each injector and don't shoot any fuel into your skin.

ps what is a "gauge with a top pressure needle"?

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85 300D turbo pristine w 157k when purchased 161K now
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked

No, it's not possible to bench test an injection pump at home. It has to be done at a diesel injection shop.

The liquid filled gauges with pop pressure needle. If you search around here for DIY pop tested you'll find it it.

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1995 E420 Schwarz
1995 E300 Weiss
#1987 300D Sturmmachine
#1991 300D Nearly Perfect
#1994 E320 Cabriolet
#1995 E320 Touring
#1985 300D Sedan
OBK #42

an 82 300cd IS a turbodiesel. so the pumps would be the same. only euro's had N/A motors in 82, and they did not make any euro CD's

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I would suggest home testing is limited to tests with the pump on the engine. Volume output per element is a standard test that is valid. Proper sequential output could be determined by careful milli volt testing as well for example. Or perhaps by degree wheel on the crank.
You could determine that delivery valves might need cleaning perhaps as well. Or a before and after test Or if one element has a problem. The real problem is to properly rectify the fault but at least you are then cetain you have one. Once identified it will in most cases require precision equipment we do not have ourselves to correct the situation.
As to why the application of these various fairly simple tests is important. Simply expressed you can determine if the pump really needs go to a shop or not.
The vertical position of the injectors during testing allows beter volume flow tests in comparison to the other pump elements. You have to estblish equal flow over time per element before seriously looking for a sequential timing problems. In my opinion an additional set of injector lines bent to allow testing can be worthwhile if you are doing quite a few older mercedes diesels over time.

"per sequential output could be determined by careful milli volt testing as well for example. Or perhaps by degree wheel on the crank"

Can you give a quick description on how this works? I thought the 617 IP's are entirely mechanical? How is this milli volt signal obtained?

"In my opinion an additional set of injector lines bent to allow testing can be worthwhile if you are doing quite a few older mercedes diesels over time."

Once you have a set of hard lines bent, swapping it out should not take more than 10 to 15 minutes. Then you can connect up a set of injectors and see if all cyylinders are pumping, you can see the spray patterns of the injectors, you can swap injectors around. you can see if any of the injectors drip. You won't be able to measure anything but just being able to see the items mentioned is incredibly useful IMO.

Anybody have an extra set of hardlines they are willing to part with? I'd post photos when I'm done.

__________________
85 300D turbo pristine w 157k when purchased 161K now
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked

Ah pop pressure tester. I know what they are. I have one. I was thrown off when you said "gauge with top pressure needle".

I thought the gauges used are just high pressure glycerine filled gauges. The glycerine dampens the vibration of the needle when pop testing and makes reading the gauge easier. I ddn't know they were called gauges with pop pressure needle.

__________________
85 300D turbo pristine w 157k when purchased 161K now
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked