W128 220SE Injector Pump Oil - Mercedes-Benz Forum

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post #1 of 11 (permalink) Old 10-04-2016, 05:53 PM Thread Starter
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Vehicle: 2007 SL550, 1996 E300 Diesel, 1959 220SE, 1965 Unimog 404.115-Sold
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W128 220SE Injector Pump Oil

I just purchased a 1959 220SE with the early fuel injection. I was looking at all the serviceable items to see the condition and was checking the oil for the injection pump. The manual states there should be a dip stick on the oil cap for the pump but mine has no dip stick so I have no idea how much oil should be in the pump. I am hoping someone can measure the length of the dip stick for me. I can see oil in the pump but it is near the bottom of the pump and I believe it should have more oil in it. Thanks

2007 SL550
1996 E300 Diesel
1965 Unimog 404.115
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post #2 of 11 (permalink) Old 10-07-2016, 09:39 AM Thread Starter
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Wow no response?

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post #3 of 11 (permalink) Old 10-07-2016, 10:25 AM
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I think this thread may have just been moved here. I don't recall seeing it here before.

I think this may be a tough question, but ironically I was talking to a friend in the Chicago area last night who apparently rebuilds these pumps. I will see if he has an answer on this and if he will chime in here.

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post #4 of 11 (permalink) Old 10-07-2016, 10:59 AM
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You have to look real close at the rear of the pump. Sometimes the 'T' handle has broken/lost and has been replaced with a cap, but it has to be there.
The oil line you see if a feed for the oil seal only. The pump has its own oil res cavity/sump.
try a mirror...
You can be assured it has an oil res b/c of the OEL fill vent cap.. The force feed/crankcase pump that supercedes res pumps do not have OEL cap/vent. That is always the first thing to ID a res pumps at a glance. So, OEL cap equates to oil res... look at rear of pump for dip...some of them had a screw head dip vs a T handle one.
Does that help?
Bob
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post #5 of 11 (permalink) Old 10-12-2016, 09:26 AM Thread Starter
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Originally Posted by Fonzi View Post
I think this thread may have just been moved here. I don't recall seeing it here before.

I think this may be a tough question, but ironically I was talking to a friend in the Chicago area last night who apparently rebuilds these pumps. I will see if he has an answer on this and if he will chime in here.
Hi, No the thread was started here. I did find another service manual that showed the T handle dip stick in the rear of the pump and after digging through all the sludge I found the dip stick. The original manual shoed the dip stick as part of the red fill cap. When I pulled the dip stick out it started spilling lots of oil on the ground. Apparently the previous owner had been over filling it. Now I am trying to remove some of the oil. The car runs good but it seems to be running rich and I may need to rebuild the injector pump. Does your friend sell rebuild kits?

2007 SL550
1996 E300 Diesel
1965 Unimog 404.115
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post #6 of 11 (permalink) Old 10-12-2016, 09:30 AM Thread Starter
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Location: Oakdale, California
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Originally Posted by BARON YOUNGMAN View Post
You have to look real close at the rear of the pump. Sometimes the 'T' handle has broken/lost and has been replaced with a cap, but it has to be there.
The oil line you see if a feed for the oil seal only. The pump has its own oil res cavity/sump.
try a mirror...
You can be assured it has an oil res b/c of the OEL fill vent cap.. The force feed/crankcase pump that supercedes res pumps do not have OEL cap/vent. That is always the first thing to ID a res pumps at a glance. So, OEL cap equates to oil res... look at rear of pump for dip...some of them had a screw head dip vs a T handle one.
Does that help?
Bob
Thanks for the response Bob. I have found the dip stick. I am hoping the pump is still working as it had been over filled and was spewing oil from the back side.

2007 SL550
1996 E300 Diesel
1965 Unimog 404.115
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post #7 of 11 (permalink) Old 10-12-2016, 09:31 AM
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Sorry I do not... I can say Black Forrest in Wisconsin or Pacific Fuel Injection in San Francisco, but big $. Maybe contact Joe Alexander (see the sl113.org site) he might be cheaper alternative. I just repair/ rebuilt the short bosch mercedes fuel pumps from 1967 to 1972, not the fuel injection pumps.
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post #8 of 11 (permalink) Old 10-12-2016, 11:12 AM
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If the car runs "good," why rebuild the injection pump" There are many things that may contribute to an overly rich condition, all of which should be eliminated before "rebuilding" the pump. Let's start with the basics and identify which pump we are discussing. Unless removed, all Bosch pumps have an identification tag that specifies the model. Share that number with us so that further assistance may be forthcoming.
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post #9 of 11 (permalink) Old 10-12-2016, 11:34 AM
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Fairchild here in California used to be where I sent the injection pump for my '55 SL many years ago. Don't know if they till exist. If yours is anything like the gullwing pump you can forget about doing that job yourself....
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post #10 of 11 (permalink) Old 10-12-2016, 04:51 PM
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Don't rebuild your injection pump if things are running right. Get the oil at the correct level. If there is gasoline in the injection pump oil then you have an internal leak in the pump -- I once had a car where the oil level kept rising but it was because gas was getting into the oil system of the pump - not a good thing.

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