83 240D IP Primer Pump Assembly
05-21-2014, 10:24 PM
#1
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1983 Mercedes 240D
83 240D IP Primer Pump Assembly
HI All,
My new project is giving me fits. I have an 83 240D that won't start. I've taken care of all the power issues (new starter, battery, wires). The problem is that it's not getting fuel. The tank screen is clean, the hoses look good. I think the issue is with the pump. I unhooked the injector rail and no fuel is coming out of the ip when the car turns over. It is pushing fuel backwards through the return line when I use the hand primer.
The hand primer has no leaks, but I took the primer pump assembly off to take a look and I found something strange. Instead of the roller ball i am used to, there is a pin with resistance.
Attached are some photos of my IP and my primer pump assembly that was on the car (with a rod) and what I am used to seeing with a roller.
Since I have no way of knowing if this part was swapped out, does this setup even look right???
My new project is giving me fits. I have an 83 240D that won't start. I've taken care of all the power issues (new starter, battery, wires). The problem is that it's not getting fuel. The tank screen is clean, the hoses look good. I think the issue is with the pump. I unhooked the injector rail and no fuel is coming out of the ip when the car turns over. It is pushing fuel backwards through the return line when I use the hand primer.
The hand primer has no leaks, but I took the primer pump assembly off to take a look and I found something strange. Instead of the roller ball i am used to, there is a pin with resistance.
Attached are some photos of my IP and my primer pump assembly that was on the car (with a rod) and what I am used to seeing with a roller.
Since I have no way of knowing if this part was swapped out, does this setup even look right???
05-27-2014, 06:48 PM
#5
Out Of Control!!
From the VIN, I believe your 616.912 engine number 089720 injection pump is 616 070 68 01---the manual pump number is 000 090 88 50 as pictured in your first post,third picture--left side-----I have no idea where the non manual fuel pump pictured on the right came from!!
05-27-2014, 07:01 PM
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1983 Mercedes 240D
The pump on the right is one with the primer removed. The pump on the left is the one that was on the injector. The confusion for me is that I am used to the roller type that is shown in the right side. The pin one in the left side of the photo is one I have not seen on a diesel mercedes, only nissan diesels. I was wondering if the pin type is supposed to even be on the pump because it is just pressing inside the pump near the groove, not inside the groove like the roller would be.
The thing is I got this car not running. So I am trying to eliminate the buggering that happened to it before i got it. I hate going back over something someone else has worked on.
I think I will just exchange the ip. As difficult as it is, it seems easier than trying to figure out the mess that is already there. I have two spare working injection pumps that I can put one of them to use.
The thing is I got this car not running. So I am trying to eliminate the buggering that happened to it before i got it. I hate going back over something someone else has worked on.
I think I will just exchange the ip. As difficult as it is, it seems easier than trying to figure out the mess that is already there. I have two spare working injection pumps that I can put one of them to use.
05-27-2014, 07:46 PM
#7
Out Of Control!!
Well we are coming from very different perspectives. I, and I am talking about MB and MB only(from MY80) have never seen the fuel pump plunger(post type) be anything other than that.
Very simple the in out pump action is result of the spring loaded plunger riding on an eccentric
Very simple the in out pump action is result of the spring loaded plunger riding on an eccentric
