Is there any procedure to testing an injection pump on the om60x series engines? Mercedes manuals list a procedure, but it requires one of their tools that are NLA.

Is a fuel pressure test adequate testing to confirm an injection pump?

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Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k

Testing in general is limited to seeing if the injection pump has problems or not. Some tests are doable. Like establishing there is no or substantially less output of a pumps element. In comparison to the others. Some by replacement of things like delivery valve seals. Or the delivery valves themselves.


Even if you could locate a physical problem inside an injection pump of this style. The re calibration after the repair is generally a specialized purchased service.

In general though with most things that go wrong they will require a good specialized service shop. Making sure there is feed fuel pressure present with no air is more an operational requirement that a pump test. If you suspect the injection pump has a problem. What is it?

Not sure what it is you want to test.

On the Fuel Injection Pump there is a Fuel Supply Pump. On the earlier Models there is some specs as to pressure of the Fuel Supply Pump at idle and at I believe it is 3000 rpms. There is also a Flow test.

However, on the older models like mine if you hook up a fuel pressure gauge even with a liquid filled gauge the needle bounces around a lot. There is some threads on how to deal with that but you need to fabricate what is needed yourself.
I don't know to specs for yours.

Note that the Fuel Supply brings Fuel into the Fuel Injection Pump Housing at specific pressures and volumes and then it exits by way of the Fuel Pressure Relief/Overflow Valve which is actually what controls the pressure. But, that is not the pressure of the Fuel Injection.

Fuel amount of Fuel Injected is controlled by the Elements in the Fuel Injection Pump in conjunction with the Governor and the pressure of the Injected fuel is controlled by the opening/pop pressure of the Injectors.
Testing the Elements for how much Fuel they put out is done on an expensive calibration machine.

If you were speaking of the timing of the Fuel Injection Pump there is an electric device called an A&B Light and there is a Mechanical Tool called a Timing Locking Pin that can be used to check the timing.
You can also get an aproximate of the timinging if you can view the port that the timing locking pin goes into.

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84 300D, 82 Volvo 244Gl Diesel

Can I time the pump without that A&B light? I've drip timed a pump before, but I don't want to if I don't have to do that.

Is a fuel pressure test enough adequate enough to tell if you have a bad IP or not? I'm just asking out of curiosity. No real reason.

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Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k

No. Too many variables may make it look like a bad injection pump. Remember this is just my opinion. For a simple item as one example. A bad set of injectors.


Even when just doing a base fuel pressure test. You have to make sure no air is getting in as well.

On the plus side, very similar Bosch IP's were used in many vehicles and farm equipment, and there are Bosch facilities that will test & rebuild them. But, not cheap.

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1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans

On mine on the emission sticker is the type of timing methods that can be used. As far as know there is no drip timing spec for the 6 cylinder Diesels.

The Fuel Injection Pump Timing Locking Pin is about $37.
You should be able to line up the pointer on the Crank Dampener rotating the Engine past top dead center to 15 degrees after top dead center.

Then unscrew the Plug to uncover the port for the Tool Screw in the Tool and there is a notch in the tool that nees to be turned till it is orizontal.

Then loosen up the Pump Flange Nuts (I don't know if yours has the support bracket in the rear but if it dose the Nut on that has to also be loosened) advance the fuel injection pump till the Tool catches it and tighten up the Nuts.

Remove Fuel Injection Pump Timing Pin and place the plug you removed.
The test for the Fuel Supply/Lift Pump only tests the Fuel Supply/Lift Pump and the Fuel Pressure Relief/Overflow Valve.

How about telling us what problem you think the Fuel Injection Pump is causing.

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84 300D, 82 Volvo 244Gl Diesel

Post #3 has a pic of the Tool.
http://www.peachparts.com/shopforum/diesel-discussion/368158-amateur-adventures-om617-injector-pump-replacement.html

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84 300D, 82 Volvo 244Gl Diesel

Thanks diesel911, I was asking in a hypothetical manor out of curiosity most likely. I may be adjusting the timing on my om602, it is out of timing on my motor. Chain stretch is ok. I've drip timed an om617 after replacing the timing chain. It threw the pump out of time.

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Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k

If it is now out of time you most likely have to pull of the Fuel Injection Pump and re-insert it with the correct timing.

That Timing Locking Pin is designed to hold the Fuel Injection Pump in time while you are inserting it.

There should be some threads in the repair links.

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84 300D, 82 Volvo 244Gl Diesel