Replacement Injection Pump '87 300D

[arnoneh]

I need a new injection pump for my '87 300D turbo. My mechanic checked the local wrecking yard and found none. The dealer sells factory refurbished ones for $2,200 (!!) yikes! Can anyone point me to a possible source of used ones? (I did just e-mail Phil at MercedesShop.com). Any leads are welcome.

THanks for the help -Harv

What makes you believe the pump is bad?

[arnoneh]

The valve sockets/housings are stripped.

[barry123400]

Put an add in our parts wanted/for sale section. There should be some good used out there. Just have to connect buyer and seller..

[Diesel911]

Originally Posted by arnoneh

The valve sockets/housings are stripped.

Please explain what the valve sockets are. Are they part of the Delivery Valves or is it the pressure relief valve on the side of the pump?
How many of the valve sockets are stripped and are you talking about the exterior splines or threaded areas inside of the pump?
Are the valve sockets on your pump threaded into the aluminum pump housing?

[arnoneh]

I'll check out the parts for sale section. I actually never noticed it was there before. Thanks.

The inside thread are shot on the first (of six) delivery valve. I don't think this can be repaired....but I'm open to any creative/good ideas on it. Otherwise, I think I'm still in the market for a new IP per the two different Mercedes mechanics I'm friends with.

Thanks -Harv

J-B Weld.

[Jeremy5848]

I have a used one available. I bought it from someone on the forum, I think, who had it overhauled and then the car was wrecked. He pulled the IP and saved it, had only a few thousand miles since the overhaul. I bought it 'cause I thought my '87 had an IP problem (which turned out to be something different). Your cost $400 plus shipping.

Jeremy

[Diesel911]

I am not entirely sure what your fuel injection pump looks like but I believe that the pic below is close enough.
The part that I labeled “Steel Ring” inserts into the aluminum IP housing and is the part that has the internal threads that the part labeled “Delivery Valve Holder” threads into.
I am not sure but I believe the Steel Ring is what the tech uses to adjust the fuel quantity ; so it should not be rotated or moved. On the 617 type IP there are 2 nuts with studs that hold in place.
Copy down the pump info from the little tag that is on the IP.
I would go to a local Bosch authorized fuel injection shop (if you can drive the car there even better) and tell them what the problem is and if you can print the pic show it to them. Ask them for an estimate as to the cost to replace the Steel Sleeve and Delivery Valve holder and their related seals. An estimate will not cost you anything.

Another possibility is that the Delivery Valve Holder (buy a new one) is usually made of softer metal that the Steel Sleeve. It may be possible with the correct size Bottoming Tap to go in remove the Delivery Valve Holder and the Delivery Valve body (valve and spring also). Put some heavy thick grease in the grooves of the tap (The purpose of the grease is to trap the metal chips in the grease so that they do not fall inside the IP). Align the tap so that in goes in properly and go in and restore the threaded area as best you can being careful not to run the tap down onto the top of the Element (Plunger and Barrel). Clean up the area and assemble with new seals and Delivery Valve Holder (turn it in by hand most of the way so that you know it is aligned correctly) and torque properly.
It is important to flush out the IP just incase some chips or dirt got inside. To do this remove the pressure relief valve on the side of the fuel injection pump (if you have a hand primer use that) start cranking the engine and push a lot of fuel out of the hole where the Pressure Relief Valve was. After you feel you have pushed enough fuel through the clean it out; reinstall the Pressure Relief Valve.

Originally Posted by Diesel911

I am not sure but I believe the Steel Ring is what the tech uses to adjust the fuel quantity ; so it should not be rotated or moved.

No, the M-pump has that adjustment internally. The external steel clamps only keep the delivery valve holder from vibrating loose.

[arnoneh]

Thanks for the responses. It did need to be replaced and I was fortunate enought to find one for a very reasonable price at a local shop. Alls well that ends well. Thanks again. -harv