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Author Topic: Some questions about the cooling system  (Read 4678 times)

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Offline Stoebel

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Some questions about the cooling system
« on: July 30, 2013, 12:43:35 PM »
Hello guys!


1) I don't completely understand the way the water cooling system works.

What I know:
The water pump (= rotor) moves the cooling liquid around the engine.
From what point to what point does the water flow?



2) There's a leak in the cooling system. Attached are some pictures of the tube that is leaking. I wrapped it with some yellow tape. The tube starts from the bottom of the radiator and goes to a black box between the air inlet and a tube going to the interior of the car. Could you tell me what the function of the "black box" is please :)


thanks a lot!

Offline Stephen Dietrich

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Re: Some questions about the cooling system
« Reply #1 on: July 30, 2013, 01:41:33 PM »
It looks like the hose going to the heater core is leaking. The tube going into the car is part of your heating system. When you turn on your "heater" for the car, hot water goes through the heater core and the gets blown into the car. I hope this helps. Stephen
Stephen Dietrich
1952 MBZ 170Da OTP
1952 MBZ 300 Cabriolet
1978 Porsche 911SC Targa
1962 Porsche 356B Super

Offline Stoebel

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Re: Some questions about the cooling system
« Reply #2 on: July 30, 2013, 04:42:32 PM »
Thank you for your reply Stephen. I thought the 170S came with and without a heating system. Are cars without a heating system missing the "black boxes"?

thx

Offline Stephen Dietrich

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Re: Some questions about the cooling system
« Reply #3 on: July 30, 2013, 05:23:07 PM »
Those without do not have the large black conduit and also do not have the black "box" where the heater core is located. As with mine, I have a heating unit located within the car. Stephen
Stephen Dietrich
1952 MBZ 170Da OTP
1952 MBZ 300 Cabriolet
1978 Porsche 911SC Targa
1962 Porsche 356B Super

Offline roadster36

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Re: Some questions about the cooling system
« Reply #4 on: July 30, 2013, 07:35:08 PM »
I explane it in Dutch to Stoebel because i dont know al the exact technical words in Englisch , sorry for that.


Stoebel,
De waterpomp pompt inderdaad het koelwater rond.
van de cilinderkop door thermostaat de radiateur in en gaat naar beneden (en word dan dus gekoeld door de rijwind en fan)
Komt onder de radiateur weer uit .
Gaat naar de bocht onder het in het motorblok dan door het motorblok weer naar boven naar de cilinderkop.
Zo werkt de koeling van je motorblok.

nu de kachel.
Als het goed is zit er op je cilinderkop een spruit die naar je thermostaat en radiator gaat
Boven op die spruit moet als het goed is een koperen kraan zitten met 2 uitgangen een links en een rechts.
onder in je radiateur moet ook zo`n koperen kraan zitten, echter zonder spindel , deze staat altijd open.
vanaf de kraan op je cilinderkop gaat er een slang naar de bovenste aansluiting op je kachelradiator en van de onderste aansluiting op je kachelradiator gaat er een slang naar de kraan onder op de radiateur.
Wil je de kachels buiten werking hebben zet je de kraan boven op de spruit gewoon dicht.
Ik hoop dat je hier wat mee kan.
gr Jan


« Last Edit: July 30, 2013, 07:48:37 PM by roadster36 »

Offline Stoebel

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Re: Some questions about the cooling system
« Reply #5 on: July 31, 2013, 04:51:43 AM »
thank you Stephen

Roadster36 bedankt voor de info! Ik zit dus met een lek naar één van de kachels. Heb jij een idee of ik die dan tijdelijk zou kunnen uitschakelen om de leiding te vervangen of moet ik eerst alle koelvloeistof "verwijderen".

Bedankt!

Quick translation in English just so you know what we're discussing:

Thanks for the info Roadster36! So I'm having a leak in a tube going to one of the "heaters". Do you know whether I can temporarily close this tube to replace it or do I have to drain all the cooling liquid.

Are these tubes easy to get in a store where they sell car parts?

Offline John Ellis

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Re: Some questions about the cooling system
« Reply #6 on: July 31, 2013, 10:09:44 AM »
You will have to replace your radiator fluid.  I would change all hoses at the same time both radiator and heater hoses.  Should be available at your auto parts store.  The radiator hoses are 28mm in diameter and the heater hoses are 12mm diameter.  Buy and cut to length.
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Offline Stephen Dietrich

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Re: Some questions about the cooling system
« Reply #7 on: July 31, 2013, 10:46:01 AM »
This maybe a good time to get your radiator re-cored. Stephen
Stephen Dietrich
1952 MBZ 170Da OTP
1952 MBZ 300 Cabriolet
1978 Porsche 911SC Targa
1962 Porsche 356B Super

Offline Stoebel

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Re: Some questions about the cooling system
« Reply #8 on: August 10, 2013, 02:54:12 PM »
Thank you for the info guys.

I noticed today that cooling liquid was leaking at the waterpump.

It seems like there is a small hole in the waterpump? Is this to make sure cooling liquid can flow away when the pressure is too high (or there is just too much cooling liquid)?

I made a picture before I cleaned the outside of the waterpump so there is some dirt sticking to the hole. I marked the place on the picture where the hole is.

Thank you for the info!

Offline Ted

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Re: Some questions about the cooling system
« Reply #9 on: August 10, 2013, 03:41:35 PM »
no, there is no such kind of valve on the waterpump. I believe this is a point for greasing, just like the one a little bit to the front and on the top  side of the pump.

Offline roadster36

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Re: Some questions about the cooling system
« Reply #10 on: August 10, 2013, 05:21:02 PM »
cooling liquid was leaking at the waterpump.
to bad , but in my opinion the only solution is a new waterpump.

Offline Stephen Dietrich

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Re: Some questions about the cooling system
« Reply #11 on: August 10, 2013, 05:28:39 PM »
You also said there were leaks at the heater boxes. You can take them out, have them repaired and re-cored. Since you will be replacing the water pump, it might be a good time to go through the entire cooling system. Just my thoughts on the subject. Stephen
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1978 Porsche 911SC Targa
1962 Porsche 356B Super

Offline Henry Magno

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Re: Some questions about the cooling system
« Reply #12 on: August 11, 2013, 02:05:34 PM »
Ted, the additional hole is so small amounts of coolant can escape before getting into the bearings. Of course if it leaks a lot, then the pump has to be replaced.

Offline Stoebel

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Re: Some questions about the cooling system
« Reply #13 on: August 12, 2013, 04:58:34 AM »
Ted, the additional hole is so small amounts of coolant can escape before getting into the bearings. Of course if it leaks a lot, then the pump has to be replaced.

Thank you for your reaction everyone.

Could you explain what the function exactly is? Would it leak more if I have added to much cooling liquid? How much cooling liquid do you guys use?

Thank you!

Offline John Ellis

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Re: Some questions about the cooling system
« Reply #14 on: August 12, 2013, 09:39:32 AM »
The cooling system capacity is 10 liters with the heating system
John Ellis
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Offline Henry Magno

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Re: Some questions about the cooling system
« Reply #15 on: August 12, 2013, 11:30:29 AM »
The leaking water pump has nothing to do with how much you fill. It's a bad seal. The radiator has an overflow pipe if you overfill.

Offline jonathan

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Re: Some questions about the cooling system
« Reply #16 on: August 08, 2014, 12:33:09 PM »
The problem with that water pump is a leakage through the packings and bearings.
Few months ago I restored my pump (same problem).
Also the impeller had some serious deposits and rust.


The impeller before


Electrolytic rust removal


Impeller after


Pump renewed with new sealed bearings and packings replaced with modern rubber seals.

Repair it, it's really easy.  ;)

Offline Ziad

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Re: Some questions about the cooling system
« Reply #17 on: August 09, 2014, 08:33:42 PM »

I can make the cooling hoses for you if needed.

W186300@GMAIL.COM