Anyone ever reseal a water pump or know if it can be done? I was just thinking that since it has a weep hole there is probably some internal seal that can be replaced.

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1990 190E 3.0L

It's not just a simple seal, and the shaft is pressed together. Its not worth the effort to even try. 103 pumps are cheap enough.

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90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff

Ok, thanks. I guess I'll get a new pump when the time comes and just experiment with the old one to see what makes it tick.

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1990 190E 3.0L

Ismalley, best to buy a reconditioned water pump at your local MB dealer. Turn in your old water pump to avoid paying the core charge.

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Fred Hoelzle

I bought a reconditioned pump from Mercedes. The casting was badly corroded before the re-build. The pits were filled with a compound that came out after a year in service. The corrosion was not adequately removed so it continued to corrode.
A recon is OK if you are lucky enough to get one made from a good core but I will no longer buy anything but 100% new from a reputable manufacturer.

MB likely contracts with an outside supplier for rebuilt parts. ( in fact very little of a car is made directly by any car maker. ) In the US the rebuilder is likely Cardone as few rebuilders exist these days.

I've rebuilt water pumps on industrial engines, not hard. The only real tools you need is a small shop press and a measuring device. Obtaining parts to rebuild an automotive pump could prove more difficult.

Water pumps can come apart two ways, bearing out the front ( drive side ) or bearing out the rear ( seal side ) Sometimes the seal is a smaller diameter than the bearing so pressing in that direction won't work. In that case, the bearing must exit from the front, this can damage the impeller.

Haven't tried it - but looks like MB sells the seals (items 8 and 20 in attached image) for rebuild - atleast for the M103 engine and the rebuild instructions are in the shop manual. See attachments.

Attached Thumbnails

   

Attached Files

20-2250.pdf (77.9 KB, 159 views)

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1986 300E (3/2002) Rear ended and totaled (10/2009)
2000 Xterra (5/2000)
1992 400E (11/2009) -Sold
1986 300E (12/2009) - Sold
2004 E500 Wagon (6/2013) - Sold

The hard part would probably be getting the impeller pulled off without damaging it. Instructions show a specialized puller.
Chances are that you would get the seal changed and the bearing would go next. Best to replace the entire pump.

The procedure neglects changing the bearing. When the seal leaks, water can enter the bearing even with a weep hole.

For this pump, the bearing is pressed out towards the front. For water pumps in general, many times the impeller is damaged in the process since special tools are not available or even possible.

I bought a reman pump from the dealer for my 190D 2.5 NA. I guess because of the rarity of the part, the casting was completely new, only used bit was the pulley face. My water pump wasn't leaking but was starting to make some noise so I replaced it. Not bad for a 320k mile part.

Buy a good German brand for the pump, should last a long time if you do.

The last water pump I installed was a Graf brand on July 24, 2010 about 120,000 ago.My pump is still going strong, but when it goes I'll try to find that same brand.

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1990 190E 3.0L

Perhaps the quality of reconditioned MB water pumps has diminished over the years. Thinking back it was 15 years ago that I last purchased a reconditioned MB water pump, but it is still going strong.

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Fred Hoelzle

How many miles are on that car?

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Current: 1975 450SEL, 83 300D, 88 Yugo GVX, 90 300D OM603 swap, 91 F150 4.6 4v swap, 93 190E Sportline LE 3.0L M104 swap, 93 190E Sportline LE Megasquirt, 03 Sprinter, 06 E500 4Matic wagon.

381057 miles.

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1990 190E 3.0L

381059.....just got to work

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1990 190E 3.0L