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Old 06-08-2001, 04:59 AM
450 SLC 5.0
Posts: n/a
I was wondering if water pumps ever go Ďbadí by the impeller not functioning as well as when new; either through corrosion of the blades or by mechanical separation from the shaft (like spinning on the shaft)?

The reason that Iím asking is my friendsí 300D (1983). The cooling system checks out OK, thermostat is new (and tested) hoses are new, radiator is only 8 months old, belts are snug, header tank cap is holding pressure, proper antifreeze mix, the auxiliary fan is working Ė so everything seems to be in order. But the car runs at about 87-89 degrees (Celsius, obviously) without A/C on, and at 95+ with the A/C on. This is during driving at air temperatures of 70-85 degrees, and at pretty much all speeds between 30 & 70 MPH, so the ram air effect should eliminate the fan clutch from the equation.

I have researched previous threads, but I canít find any that seem to be the same problem. This is assuming that it *IS* a problem. In previous threads, it seems as though the 123 cars run a little hotter than the 126 cars with the same engine; at least thatís my impression based on the reports from other people. The only other thing that I can think of is if the gauge is not calibrated accurately.

Any ideas?

Thanks In Advance!
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Old 06-08-2001, 05:38 AM
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Join Date: Jun 1999
Location: Los Angeles, Calif, USA
Posts: 521
I had seen blades spinning on the shaft, MB cars.

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Old 06-08-2001, 09:10 PM
RunningTooHot's Avatar
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Join Date: Aug 2000
Location: Here
Posts: 832
I just bought an 84 300D and it seems to run just about like yours. I am completely new to diesels, so I cannot vouch for these being normal temperatures. It has me a bit concerned, as I am used to the V-8 engines, which if they were running this hot, something would definately be wrong. Perhaps some of the more knowlegable people out there might pipe in on this?
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Old 06-08-2001, 10:45 PM
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All Things Wear

Brother of The Benz 450 SLC 5.0,
If the proper concentration of coolant and water has been maintained, I don't believe the impellar would wear enough to be measured.
The temperatures you are experiencing are quite acceptable considerring the cooling system is pressurized to at least 13 psi.
The pressurized system has a higher boiling point as does the coolant mixture.
The higher the engine coolant can run the better it is for your engine. The engine lubricant is cleaned better in the filtration unit and any condensed fluids in the crankcase are evaporated at these higher temperatures.
I'll take an engine running at 85-90 or even 100 C. over one at a less temperature. After all 100 C is only 212 F.
You may be able to see the circulation of the coolant in the upper tank.
Keep maintaining the proper mixture of coolant for you have already done your preventative service and watch for any radical temperature changes.
All prudent Benz owners do this as routine instrument scanning.
Happy Trails Beep Beep from The Spiderman in Houston!!!
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Old 06-09-2001, 02:42 PM
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Attaway, Donkey

Brother of The Benz, Donkey.
You should bet a big atta boy.
If more of us would use their grey matter more often as you did, more of us would keep our beloved Benz out of the clinic.
I've never had to go to the Car Wash for such drastic surgery, just the garden hose and nozzle squirted from the fan side to the front with every wash job. Get those squished bugs off and you shouldn't have to use a bug screen.
Happy Trails Beep Beep from The Spiderman in Houston!!!
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Old 09-05-2001, 12:59 AM
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Join Date: Oct 2000
Location: Columbus, Ohio, USA
Posts: 72
Me too

450 SLC,

I too, have witnessed the same effects that you have. I have had my 84 300D since practically new and I noticed the temperature gauge was solid at 80 all the time, winter or summer, AC or no AC. After about 12 years or so, I began to notice the gauge fluctuating more than usual with readings on a hot day and with AC and going up a hill, I could hit 115. The point is now my front crankshaft seal needs to be replaced and I am wondering if I should do the water pump, hoses, belts, and thermostat at the same time. I think I will for piece of mind, but I always wondered about the impeller degrading over time. I will let you know what I find out.

Best regards,
'06 E320 CDI 51K miles
'02 VW Jetta GLS TDi 120k miles
'99 Ford E350 7.3L Powerstroke 200k miles -sold
'84 Euro 300D 5 spd manual 317k miles - sold
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Old 09-05-2001, 02:02 AM
Posts: n/a
Re: Me too

[QUOTE]Originally posted by Gray Market Survivor
I am wondering if I should do the water pump, hoses, belts, and thermostat at the same time.

I am a remodeling contractor. I have customers ask me similar questions. My answer "now would be the time". It might cost a little more in parts and labor but as long as you have everythig ripped apart it just makes sense. To do it later would require ripping it appart again. Even more cost and mess and aggrivation and inconvienience. Use your judgement as to what actually needs replacement..
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