Hello,

I will be attempting the replacement of the waterpump in my 190e. Would there be any helpfull tips or issues that I should be aware of? I have read a post on how to do a 300e. Would this be the same procedure?

Thanks You,

Walter

Yes, I believe they would be the same. Someone can correct me though.

__________________
Michael LaFleur

'05 E320 CDI - 86,000 miles
'86 300SDL - 360,000 miles
'85 300SD - 150,000 miles (sold)
'89 190D - 120,000 miles (sold)
'85 300SD - 317,000 miles (sold)
'98 ML320 - 270,000 miles (sold)
'75 300D - 170,000 miles (sold)
'83 Harley Davidson FLTC (Broken again) :-(
'61 Plymouth Valiant - 60k mikes
2004 Papillon (Oliver)
2005 Tzitzu (Griffon)
2009 Welsh Corgi (Buba)

The 260(2.6litre) and the 300(3.0litre) are both M103 motors. The former simply has a smaller bore. The differences you'll encounter will have more to do with how the water pump is secured. Some use a combination of allen-head and hex-head. Benzmac has had alot to say about this subject. There is a tool made by Snap-On and if my memory is correct, it's called FLX-13 or FLX13. You might want to do a search on this tool number.

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Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
"Fräulein"

Thanks for your help! I have found the thread by Benzmac and I'll be picking up one of those FLX-13s tomorrow. Wish me luck!

Regards

Walter

I did my 1990 190 2.6. I didn't need special tools. I would get a new serpentine belt, a new belt tensioner along with tensioner shock and threaded tensioner rod. I removed the radiator power steering pump and belt tensioner. Don't count on doing it Benzmac's way, hes a pro. You are working blind on the two rear water pump bolts. You should have the replacement there to look at so you have an idea where the bolts are.
The biggest problems I have were with the allen head bolts on the pipe that goes to the water pump tothe auxilliary water pump on the timing chain cover the bolt would not budge. Also you may find a combination of regular hex bolts and allen bolts. Be happy if you have hex head bolts.3 and one allen.
Also the allen bolt on top requires an allen. I had to use an allen socket held in with force with a screwdriver and turned with a box wrench. Good luck. You can E-mail me with questions.

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1990 190E 2.6
1996 Grand Voyager 3.3
1985 Mustang GT 5.0 5 SPD
1982 Suzuki GS 750T

Thanks for the info JDUB. I have a new serpentine belt as well as a thermostat. I am surprised that the waterpump is this hard of a job on this car. Why would you replace the belt tensioner, and would there be any other service that I should do at the same time?

The belt tensioner is a classic problem on the M103 190E. When mine went bad, the A/C compressor would turn off intermittently because the compressor relay was detecting belt slippage. Expensive part, too--but you can share the labor with the water pump replacement. Cheers, Andrew Seidel.

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86 560SEC
85 500SEC Lorinser
83 300D Turbo
75 240D

Check the bearings on the serpentine belt tensioner pulley and the fan pulley as soon as you have the belt off. It might take time to get replacements and you don't want to have to take everything apart again to change those pulleys. On my car, the fan pulley is part of an assembly that includes the base that bolts to the front of the engine.

Another good measure item is that stubby hose that goes between the thermostat housing and the head.

Sixto
91 300SE
81 300SD

gl1200 hows the water pump replacement going? Haven't heard from you. Hope your not having problems. Hope your having fun. Let us know how it turns out or if you need help.

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1990 190E 2.6
1996 Grand Voyager 3.3
1985 Mustang GT 5.0 5 SPD
1982 Suzuki GS 750T

Hi JDUB,

It's done! No leaks and the temp is running slightly over 80C. It was a lot harder than I thought, and took over 8 hours. The problems were with the hex bolts... one of the allens snapped and was stuck inside the bolt. Nothing would take it out, finally we cut the bolt and replaced them with hex bolts. Putting the whole thing back together was a snap once you know what you're doing. I replaced the serpentine belt and the thermostat along with the water pump. The tensioner and shock seemed fine. The only problem now is the coolant light remains on, I suspect the sensor. The coolant level is well above the sensor and the light is still on. Thank you for all of your help!

Walter

My mistake!

I meant allen bolts in the previous post, regarding the allen breaking.

Sorry

Good job! I knew you could do it. It feels good when this job is complete. A lot of pros that don't work on 103 engines would give upon this one.

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1990 190E 2.6
1996 Grand Voyager 3.3
1985 Mustang GT 5.0 5 SPD
1982 Suzuki GS 750T

I see you have a Gold Wing. I just junked my Kz650 it needed too much stuff. I stripped off the parts and gave the to my buddy. My Suzuki 750T is in exceptional condition. It does have a minor oil leak but I'm not tearing it apart yet. I live in Chicago and the motorcycle season is not long. It runs good and I'm too busy with income tax season to take on any big projects.

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1990 190E 2.6
1996 Grand Voyager 3.3
1985 Mustang GT 5.0 5 SPD
1982 Suzuki GS 750T

Hi JDUB,

Here in Toronto the weather was 6C and sunny today so I took mine out for a ride. The forecast for the week is sunny and warm, I can't believe its January... Only a couple of months to go and I'll be riding again every day. My bike is in mint shape 40,000 miles and runs like a swiss watch. This was the first year of the 1200's and the last year of the standards. I'm not crazy about the big GW's, I'm still a little young for one of those! Thanks for your help.

Walter