What Am I Looking At Here? - PeachParts Mercedes-Benz Forum

coldwar · #1 04-12-2005, 12:50 PM

Attached is a photo of my fuel filter. I want to change it, but it seemingly has no resemblance to what everyone else here describes as a "spin-on" filter. It has a Bosch part # D450101011, but it also has that dashpot thingey attached to it. Is anyone familiar with this setup, and do I have to buy the filter along with the other thing, whatever it is? How do you get all the lines and hoses off? To me it doesn't look like a 15 minute job.

Dave 1976 300D W115

Palangi · #2 04-12-2005, 02:11 PM

Going strictly from memory (I had a 200D with that kind of filter about 30 years ago).

The bolt near the bottom is the drain. By the way, I like the idea of being able to drain the water and krud out, something you can't do with the spin on filters. Frankly I wish the newer models had this kind of fuel filter.

After you drain it, undo the center bolt. That should allow you to lift the cap off and replace the filter element. Replace the the element. You might want to partially fil the filter with clean fuel to reduce the need for hand pumping. Secure the cap. Loosen the bolt on the edge of the cap. That will be the bleed screw. Put a rag over it so it doesn't squirt on you. Pump it up with the hand pump until fuel comes out of the bleed screw. Secure the bleed screw and start her up.

PM me with your E-Mail address. I will scan a picture of the parts diagram.

coldwar · #3 04-12-2005, 03:33 PM

Quote:

Originally Posted by Palangi

Pump it up with the hand pump until fuel comes out of the bleed screw.

My engine does not have the hand pump.

Dave

P.E.Haiges · #4 04-12-2005, 06:35 PM

Palangi,

Why do yuo think the fuel return line is attached to the fuel filter? It is because there is a bleed hole in th etop of the filter to get the air out. Therefore, you don't have top loosen any thing to bleed the air out of the fuel system.

Coldwar,

I also liked the old style filters for the same reasons as Palangi. MB actually recommended cleaning instead of replacing them and had a tool to do it. The tool held the filter and pumped solvent thru the filter in reverse.

If your engine develops full power on a hill, the filter doesn't require cleaning or replacing. Just remove the lower bolt to let any water or dirt out.

You also have an inline filter. The filter is inside an aluminum can with a screw on top to hold it close. The filter screws out of its seat.

Are you sure you don't have a primer pump? I thought all the MB Diesels built before 1986 had a primer pump.

P E H

Palangi · #5 04-12-2005, 08:48 PM

PEH, As I said, I am going by dim memory from a long time ago, however I distinctly remember following the instructions in the manual and getting seltzered by the bleed screw first time I tried it.

Coldwar, that thing's gotta have a hand pump adjacent to the injection pump someplace.

coldwar · #6 04-13-2005, 07:32 AM

Quote:

Originally Posted by P.E.Haiges

You also have an inline filter. The filter is inside an aluminum can with a screw on top to hold it close. The filter screws out of its seat.

Are you sure you don't have a primer pump? I thought all the MB Diesels built before 1986 had a primer pump.

P E H

I recently begn using B20 fuel, and from what others have written about how it loosens old diesel crud, it would be a good idea for me to change my filters, or at least have new ones in the trunk ready to use.

Would the inline filter happen to be the round aluminum disk shaped thing I referred to as a "dashpot thingey" in my original post (with photo of same)? It has a screw on top as you describe.

Attached is another photo showing my injection pump. There is no handpump, unless I'm totally looking in the wrong place. There is an engine driven lift pump below the injection pump, not visible in my photo, so I presume a filter change operation would involve filling the can up with fuel, as Palagi said. Then when cranking, the lift pump would do the rest.

Dave

mdisav · #7 04-13-2005, 07:56 AM

The dash pot thingy is the hand pump. Push hard to bottom it out and let it go. It is a semi-vigorous activity. Do it repeatedly until you hear the injector pump hiss a few times. Then you are ready to start her up.
If you want to change the inline filter too it is located kind of below the power steering pump resovoir againtst the inner frame/fender. It is probably clear or milky plastic.

coldwar · #8 04-13-2005, 08:44 AM

Quote:

Originally Posted by mdisav

The dash pot thingy is the hand pump. Push hard to bottom it out and let it go. It is a semi-vigorous activity. Do it repeatedly until you hear the injector pump hiss a few times. Then you are ready to start her up.
If you want to change the inline filter too it is located kind of below the power steering pump resovoir againtst the inner frame/fender. It is probably clear or milky plastic.

Well stuff my mouth with cod oil!!! I never would have thunk it! When someone mentions the hand pump, I've always pictured something a lot bigger and more obvious for some reason. And that in-line filter- I just went out and looked and yeah now I see it. Looks terribly hard to get at though.

Thanks everyone for your help.

Dave- less mystified

engatwork · #9 04-13-2005, 09:39 AM

Here are some underhood shots of the 190D. I guess these are my fuel filters?

What are the items on the firewall?

tia

coldwar · #10 04-13-2005, 10:01 AM

Quote:

Originally Posted by engatwork

Here are some underhood shots of the 190D. I guess these are my fuel filters?

What are the items on the firewall?

tia

I'm guessing the ceramic part with the metal cover would be a series dropping resistor for your glow plugs- or perhaps the inline 60 amp fuse holder for the glow plugs. The cylindrical parts- no idea. One of them appears to have electrical and vacuum connections- cruise control?

Noticed on your second photo there is a round black plastic knob- now THAT is what I was expecting to see for a hand pump. Mine is so totally different than that, I had no idea it was staring me right in the face!

Dave

diametricalbenz · #11 04-13-2005, 11:23 AM

Quote:

Originally Posted by engatwork

Here are some underhood shots of the 190D. I guess these are my fuel filters?

What are the items on the firewall?

tia

I believe the item in the center is actually the windshield washer pump. My w115 has one that looks just like it although it is right behind the battery tray as opposed to the firewall.

Palangi · #12 04-13-2005, 03:54 PM

The ceramic thingy is the glowplug resistor. From the looks of it, it needs a good cleaning to remove the corrosion buildup. (Be careful, it's not hard to crack it). I bet the electric washer pump is an add-on. The original washer pump was a foot pedal, whose bladder parts are NLA. I have no idea what the white cylinder is, but I doubt if it is original.

Kool car, I love the red interior and the barber pole speedometer.