95 E300D (606.910) Fuel Lift Pump Rebuild Question - PeachParts Mercedes-Benz Forum

tankowner · #1 10-03-2010, 06:00 PM

Hey All:

I am in process of trying to replace the seals in the lift pump of my 95 E300 and I have some questions. The first attachment is the EPC exploded view of the lift pump - I have added in the EPC labels and part numbers. The second attachment is my exploded view of my lift pump - taken off the IP and disassembled. The two don't really jive - in fact, I have only found one o-ring on my lift pump - #276 on the EPC diagram (presumably this is the o-ring for the screwed in fitting that it is directly below it in the diagram but not shown as a seperate fitting). Anyway, the main question right now is - where are these other o-rings?

Are all the orings internal to the lift pump, or are some supposed to be visible on the exterior of the pump once you remove it from the IP? Let me know if I need to clarify anything or take any other pics to help explain. Thanks!

Diesel911 · #2 10-03-2010, 07:59 PM

Quote:

Originally Posted by tankowner

Hey All:

I am in process of trying to replace the seals in the lift pump of my 95 E300 and I have some questions. The first attachment is the EPC exploded view of the lift pump - I have added in the EPC labels and part numbers. The second attachment is my exploded view of my lift pump - taken off the IP and disassembled. The two don't really jive - in fact, I have only found one o-ring on my lift pump - #276 on the EPC diagram (presumably this is the o-ring for the screwed in fitting that it is directly below it in the diagram but not shown as a seperate fitting). Anyway, the main question right now is - where are these other o-rings?

Are all the orings internal to the lift pump, or are some supposed to be visible on the exterior of the pump once you remove it from the IP? Let me know if I need to clarify anything or take any other pics to help explain. Thanks!

Pull the Central Pin/Rod from the Threaded piece that the Arrow points to. I believe there is a Tiny O-ring inside of there.

Diesel911 · #3 10-03-2010, 08:21 PM

I have been looking at a cross section pic of the Lift Pump. I am going to try top post a pic but I bought a new computer and my Old 32 Bit Photoshop program will not even attempt to load on it. So I am having trouble sizing the photo. so a pic may not be in this post.

Inside of the Pump Piston there is a Valve.
What Seals that?
There is also another valve at the Pump Outlet what Seals the bottom of the Valve against the Pump Housing?
I am thinking they might use O-rings.

tankowner · #4 10-03-2010, 09:13 PM

Quote:

Originally Posted by Diesel911

Pull the Central Pin/Rod from the Threaded piece that the Arrow points to. I believe there is a Tiny O-ring inside of there.

Bingo. That would be #270 (023 997 86 48). As seen in the attached pic.

Good call Diesel911.

The search continues. Thanks for the diagram.

Edit: That one is kind of a booger to get out - I used a dental pick, it worked well.

JimmyL · #5 10-04-2010, 12:25 AM

I hope you have pics of the removal of the lift pump!!

tankowner · #6 10-04-2010, 02:07 AM

Quote:

Originally Posted by JimmyL

I hope you have pics of the removal of the lift pump!!

Indeed Jimmy. I will piece togther DIY once its all said and done. I thought it would be fairly straight forward - and it is for the most part, I just got hung up on these o-rings. Once I get everything figured out, I will post it all together.

tankowner · #7 10-07-2010, 10:51 PM

Okay. So I needed to order another o-ring and while I was at it, I thought I would order the two valves for replacement in the fuel lift pump. Has anyone ever replaced these things (see picture)? These things seem to be pressed in and I can't figure out how to go about replacing them. I the process of trying to press one out I think I mucked up the housing

! This thing is turning into a PITA. Anyone ever replace these things? They are listed in the rebuild kit, so I figured that it was doable. I think I should have just left them alone. Any advice or insights would be appreciated right now.

See the pic which shows one new valve and the housing that still contains an old valve. This piece is internal to the pump. The other valve is in a screw on fitting on top of the pump and I think I might have killed that one.

ROLLGUY · #8 12-15-2010, 01:05 AM

Quote:

Originally Posted by tankowner

Indeed Jimmy. I will piece togther DIY once its all said and done. I thought it would be fairly straight forward - and it is for the most part, I just got hung up on these o-rings. Once I get everything figured out, I will post it all together.

I would be interested in a DIY as well. One day I may need to do the pump in my E300. Do you have a part number for the kit? Do you know if that is the same pump used in all the 60X engines? I had a 190D 2.2 and the pump looks the same. I have an extra and thought I would rebuild it for the E300 (assuming it is the same) so I would have it on hand if/when the pump goes bad.

tankowner · #9 12-15-2010, 11:55 AM

Quote:

Originally Posted by ROLLGUY

I would be interested in a DIY as well. One day I may need to do the pump in my E300. Do you have a part number for the kit? Do you know if that is the same pump used in all the 60X engines? I had a 190D 2.2 and the pump looks the same. I have an extra and thought I would rebuild it for the E300 (assuming it is the same) so I would have it on hand if/when the pump goes bad.

I did do the DIY write-up, you can find it here:

OM606 Fuel Pump Rebuild

I'm not sure if member DIY articles ever get posted to the Wiki DIY page anymore or not.

ROLLGUY · #10 12-15-2010, 07:51 PM

Quote:

Originally Posted by tankowner

I did do the DIY write-up, you can find it here:

OM606 Fuel Pump Rebuild

I'm not sure if member DIY articles ever get posted to the Wiki DIY page anymore or not.

Yes, thank you. I found that thread after posting on this one.

Lowflyingbird · #11 01-04-2011, 10:15 PM

I have a 96 E300, Would you know if it's the same?

ROLLGUY · #12 01-18-2011, 11:07 PM

Quote:

Originally Posted by Lowflyingbird

I have a 96 E300, Would you know if it's the same?

I would think it is the same if you have the 606XXX engine.

J-P · #13 07-27-2019, 02:51 PM

Old thread, but in case you’re reading, do yourself a huge favor and just buy a whole new unit with the kit that includes the gasket and o-ring. Too much risk and time for too little reward.

Diesel911 · #14 07-27-2019, 07:52 PM

Quote:

Originally Posted by J-P

Old thread, but in case you’re reading, do yourself a huge favor and just buy a whole new unit with the kit that includes the gasket and o-ring. Too much risk and time for too little reward.

Please explain the risk in more detail.