300SD W126 water pump leak?

[92300SE]

Hi,I have a question on my new(for me) 82' 300SD,w126.
I recently purchased this car(very cheap),it runs great,just,I
think the water pump gave up.I found antifreeze under the car
only after I shut the engine for a couple of hours(over night),
dripping down from under the water pump,it does not leak
when engine is running?,no bearing noise from water pump,
normal operating temp.,just a half quart of antireeze every
morning under the car,coming from behind the cooling fan right
where the water pump is bolted in the block with 6-8 bolts.Is it
possible to be something else?,all the water hoses are new.

[WANT '71 280SEL]

It is probably leaking from the w/pump weep hole, most common leak on the pumps. Only fix is to replace the pump. I think that is usually the reason to replace a waterpump, a leak there.
Thanks
David

[pwogaman]

Sounds exactly like how my water pump went. Sort of all of a sudden it was leaking out of the weep hole. It wasn't too hard to change out the pump myself and was also, fortunately, comparatively cheap. If you're a dyi'r just order one on line, but also change out your belts at the same time since you have to remove them anyway.

[WANT '71 280SEL]

Isn't the waterpump belt the closest to the engine? If it is, then definitely get all new belts since the other ones will be off too. Actually, the P/S pump may be the furthest back. let me know on yours.
Thanks
David

[greybeardmike]

I wanted to have a spare water pump on hand and it seems there are two water pumps a long and a short. One is listed as 3 1/2 inches with 5/8" hub. is this the long or the short? Can anyone list the dimensions for both of them?

[SD Blue]

greybeardmike,
We won't be able to help much unless you give us a model and year.

(Hint: to make it easier in the future, go to "UserCP" and edit your signature to include year and model.)

[greybeardmike]

Sorry about that, it is a 1982 300SD, 917.951 engine. I see water pumps with 3 1/2" hub height and 5/8" hub thickness. Other places want to know if it is short or long. Can't measure what I have right now, I'm at work. Anyone know the actual dimensions for the short and long?

[rrgrassi]

Originally Posted by greybeardmike

Sorry about that, it is a 1982 300SD, 917.951 engine. I see water pumps with 3 1/2" hub height and 5/8" hub thickness. Other places want to know if it is short or long. Can't measure what I have right now, I'm at work. Anyone know the actual dimensions for the short and long?

Are you sure about the engine #. IIRC that car should have the 617.952 engine.

[tangofox007]

Originally Posted by rrgrassi

Are you sure about the engine #. IIRC that car should have the 617.952 engine.

YDNRC.

[rrgrassi]

Originally Posted by tangofox007

YDNRC.

You Do Not Remember Correctly...Figures. Hmmm I wonder if I can use the "I Don't Remember" line when I get to go to Vegas...

[greybeardmike]

Your right it is the 617.951 engine.

[jimandsuzy]

Auto Zone about $45, life time warranty. They didn't ask me about a long or short and the one I got fit.

[SD Blue]

The best bet is click on "Buy Parts" at the top of the page. It is listed there for about $50, from someone that knows your car, supports this forum (where you find answers) and I would lay odds, noting where you live, that Phil could have the part sitting on your porch the next day.

BTW, the website shows 4-hole long for your car.

[toomany MBZ]

Former indie mechanics don't care much for chain parts, (Advance Auto Zone) I'd go with one from here or elsewhere that deals with MB parts.

[Jim Taylor]

i was wondering if anybody had a 6.9 starter motor for sale that works . I live in sydney. nsw. australia