Okay guys, how does the injector pump work?? I think I either need to replace or repair the injector pump or the electric fuel pump on my car. Is the IP belt operated?? How does it work??

If you have a 300D unless someone added one to you Car there is no Electric Fuel Pump.
There Mechanical Fuel Pump is on the side of the Fuel Injection Pump.

You might explain what symptoms your Car is having and let the Members see if they can identify what is causing the problem.

A rebuilt Fuel Injection Pump can cost between $1200-$1500.
And, the Fuel Injection Pump seldom causes problems.

Explaining how the whole Fuel Injection Pump Works is complicated.

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84 300D, 82 Volvo 244Gl Diesel

These links should have all the data you need.

http://www.peachparts.com/shopforum/diy-links-parts-category/142405-diesel-injection.html

http://www.peachparts.com/shopforum/diy-links-parts-category/142399-fuel-delivery.html


.

The Chilton's Repair Manual that came with the car says that all MB diesels come with an electric fuel pump located underneath the rear floor pans.


Now I am really confused. Please clarify someone!

Chiltons is wrong, you have a pure mechanical system, the only electrical needed is a starter..


All GASOLINE Mercedes through at least 1991 did have one or two pumps located there.


.

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I have a Chilton Manual and it also covers the Gasoline Engined Models. Believe it or not the people who write the Manuals may not know that much about Diesel powered Cars.

While the pic is for a 4 cylinder Fuel Injection Pump from a 240D the Fat Blue Arrow points to the Fuel Supply/Lift Pump.
The Blue X makes an old Style Hand Primer Pump (You un-serew the Plastic Knob and pull it up and push it; when done push it down and tighten it firmly but not hard). Or, you may have a newer style that is covered with Black Rubber that you simply push down on and release to make it Pump.

I will explain in a general way how the Fuel Injection Pump Works.
Inside of the Fuel Injection Pump is a Camshaft.
Part of the Camshaft pushes on the Fuel Supply Pump and works the Piston and Spring inside so that it Pumps Fuel. On the side of the Engine Fuel Injection Pump is a Fuel Pressure Relief/Overflow Valve the controls the Fuel Supply Pressure inside of the Fuel Injection Pump Housing.
However, that does not create the High Pressure for Fuel Injection.

The Camshaft pushes on Tappets with Rollers and they intern push on Spring Loaded Plungers (Mercedes calls them Elements).
When the Plungers go up the Fuel is Pushed through the Steel Fuel Injection Hard Lines to the Injectors.
The Injectors are sort of like Spring Loaded Relief Valves that are set to relieve at a certain Pressure. So the Injectors hold back the Fuel until the Plungers inside of the Fuel Injection Pump rise enough and create enough pressure to open the Fuel Injector and the Fuel is injected into the Engine.

I will let you read up on how the Governor and your Foot on the Accelerator Pedal adjust the amount of Fuel that is Injected.

Attached Thumbnails

 

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84 300D, 82 Volvo 244Gl Diesel

Roy gave you plenty to read, keep you busy for quite a while.
There will be a test at the end of the week.

Throw the Chilton on the next Ice Burg floating away from Alaska,.

Start searching on E-bay for a set of paper MB FSM. they are not real plentiful, but come up from time to time. Vol 1 & 2 W123, engine manual 617.95 engine, AC heat climate control manual for the type I, II & III systems used in the 123. and then the Electrical trouble shooting manual, covers 83 to 85.

There is the manuals on CD as a second choice. and then the Haynes manual, a good guide, but seems more for the UK models. shows the old iron box 4-spd trans, but not the later all one piece 4-spd. says it goes to 85,but lacking in this area too.

Also start searching in the search tap above in the google part for what ever you need info on. there is a wealth of info in the archives on this forum.
And the DIY Links and Articles.


Charlie

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there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works

Thank You, yeah the Chilton's was very reliable for the starter replacement, and it came with the car. It was also very reliable with the transmission service, so I assumed it would work for the fuel issue. Thanks!

Yeah, I think that the Chilton's is going to go into the fireplace. I had called Mercedes-Benz and they sent me to the link to the online manuals, but my computer wont let me see them!

Thank You again!!

All above info is spot on and helpful. I must add that to best utilize this resource (the forum and its members), it is helpful to clearly state your issue and what you are working on. When someone eludes to the fact that they have no idea how something works, and in turn comes up with their own diagnosis out of no where...they are clearly not utilizing this resource at all. (Never mind using the search function).


May I suggest opening the hood and spending some time investigating.

Perhaps take a logical approach like this:
You put fuel in at the door in the rear. Where does it go? (investigate).
So the tank is somewhere in that region, how does the fuel get up front? (surely not magic). Look for tubes or pipes. Being from alaska, pipelines must come to mind.
Once you find the tubes under the car that "might" transport fuel, where do they go?
You find 2 lines that go forward to the engine bay under the driver. Looking under the hood you notice those lines have rubber hoses attached and one has a plastic looking thing that has liquid in it. Both go to the motor.
Looking carefully you find the funny looking thing with metal lines coming out, maybe that thing is important.

....and so on.


Just by investigating on your own, you would effectively learn more than just posting a shout out on the internet asking a series of questions that can be answered with simple research.

I love these:
Let me google that for you

Here is a little more info about the injection pump. The OM603 is highlighted.
Mercedes-Benz OM603 - Wikipedia, the free encyclopedia


Dont take this the wrong way as my comments could be construed as being cheeky. Just trying to offer a better solution to the knowledge you seek.

Think of this: You can give someone a bite to eat and they will be fed for a day, teach them to create their own food and they can be fed for a lifetime.

Best of luck and enjoy the MBz family of diesels they are fantastic.

__________________
83 300TD (need rear wiper assembly dead or alive)
84 300SD Daily driver
85 300TD almost 400k miles and driven daily.
98 E300D *sold
86 300SDL *sold and made flawless 10 hour journey to new home.

Cheers does the 1987 300 SDL IP have it's own separate oil ??,, or is it shared with the engine,, if it has it's own oil,,, may change it out this week end ty

Slightly off topic....

The 87 W126 with OM603.___ should use share oil with the motor unless I am remembering incorrectly.

Good question.

__________________
83 300TD (need rear wiper assembly dead or alive)
84 300SD Daily driver
85 300TD almost 400k miles and driven daily.
98 E300D *sold
86 300SDL *sold and made flawless 10 hour journey to new home.

I think when we have a problem under the Hood we often suspect the Component that we understand the least.

If we have a loss of Power we expect that the Fuel Injection Pump is not putting out enough Fuel when it is most often (like 96% of the time) a plugged up Fuel Tank Screen/the Fuel Filters or Air getting into the Fuel Supply to the Fuel Injection Pump.

When the Glow Plugs are having a problem we suspect the Glow Plug Regulator when it is most often some Glow Plugs have gone bad.

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84 300D, 82 Volvo 244Gl Diesel

IP's aren't driven by belts. Belts are for Honda's and washing machines... The IP is driven off a gear which is driven by the timing chain (again, chain..belts are verboten on interior engine mechanicals..

Good luck!