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  #16  
Old 08-15-2011, 10:50 PM
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Quote:
Originally Posted by tangofox007 View Post
Considering that a properly operating thermostat only begins to open at 80 degrees and does not fully actuate until the coolant temp reaches 94 degrees, there is no basis for that claim.

Except the two I have owned stayed at 80

Given the design of the thermostat housing, that would be quite a feat.
It will bolt right up backwards

OP: Follow this
http://www.dieselgiant.com/thermostatreplacementandmodif.htm

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  #17  
Old 08-16-2011, 03:41 AM
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Quote:
Originally Posted by draaronr View Post
thoughts ideas?
I already answered your question, yes, thats very high. You still have air in the system.
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  #18  
Old 08-16-2011, 04:02 PM
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Which water pump did you install? When I had to replace mine, I discovered there are at least three different water moving fins designs -- some looked more efficient than others to my unknowledgable eye.
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  #19  
Old 08-16-2011, 05:00 PM
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Is your system holding pressure?
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  #20  
Old 08-16-2011, 05:42 PM
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Quote:
Originally Posted by ashedd View Post
It will bolt right up backwards
Sadly I can second that observation
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2002 e320 4matic estate│1985 300d│1980 300td
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  #21  
Old 08-17-2011, 12:07 PM
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yup holding pressure, not sure on the brand would have to check box, but it is circulating. I am going to pull radiator and have the flow tested, it looks fine but guessing it is blocked or something, or guess I should say hoping it is
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  #22  
Old 08-17-2011, 10:26 PM
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I have the plastic fan on my 1978 300SD, I beieve it is from a later 617. I am using it in place of the aluminum 5-blade fan my car came with.

Right now, we are using an 80C thermostat. The car runs 180F all the time and never goes over 190F even when sitting in the drive-through. On the freeway, with the A/C on in 100F+ weather, the temp will creep down to about 175F and then come slowly back up to 180/185F once you get back in town....Robert

P.S. Those readings are taken with a mechanical guage for accuracy
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Did you just pass my 740 at 200 kmh in a 300SD?????

1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013



100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership
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  #23  
Old 08-22-2011, 03:52 PM
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Quote:
Originally Posted by draaronr View Post
81 300sd, just replaced the water pump as it was failing all else seems normal. temps were seemed to be climbing and I could hear the pump beginning to fail, but after change of pump it still seems kind of high, this is driving for 10 minutes and getting up to 75mph for 5 minutes. outside temperature is 90 and ac was on, thoughts ideas?
I will assume you have heeded the advice of others here and checked to be sure you have removed all the air from the system. Have you tried running without the thermostat for test purposes only???

Let me give you an example of what a stock, correctly functioning cooling system on a 300SD should be capable of.

My 1978 300SD has the stock radiator, which has been cleaned once since I have owned the car. I am using the 11 blade plastic fan (later model) with the stock thermostatic clutch. I use 40% coolant to 60% distilled water here in Central California.

My engine produces 14.5 lbs boost at WOT in second gear and the ALDA is backed all the way out, CCW. The engine is internally stock with the exception of Gapless Piston Rings (custom by Total Seal) and the later '05' camshaft.

I am running both the factory gauge in the instrument cluster and a Stewart-Warner machanical temperature guage, both tapped into the cylinder head.

For testing, I take an old thermostat and remove the valve, so the only thing I am installing is the thermostat body.

If you refer to the attached image, you will notice I am running 144F @ 75 mph (about 3200 rpm) at 95F ambient with the A/C on. The 144F reading is based on the mechanical gauge, which is close to what the factory gauge is reading.

The second photo will show you my stock radiator. There is no trick core here, or aluminum replacement, just a 1978 radiator that has been cleaned and resoldered.

Climbing the Grapevine south of Bakersfield in 95F to 100F temperatures, the coolant temp will come up to about 177F to 180F and stay there, again verified by the mechanical gauge.

This should demonstrate what the cooling capability of a properly functioning, stock system can do.

With an 80F Whaler Thermostat, my temperatures run about 180F at cruise and won't go over 190F under load, or during periods of extended idle. My auxilliary fan will only come on at 100C, and I have had to block the radiator with a blanket to push the heat up far enough to test the circuit. The car will not get over 190F on its own, under any conditions.

My wife just returned from a trip to Hesperia in the High Desert and all her passenger's remarked on how cool the engine ran and how cold the A/C was.

At night, you can watch the thermostat cycle. The temps will drop down under 175F, and then come back up to a little over 180F, then drop back down again. You can set your watch by the movement of the factory and aftermarket (mechanical) guages as they rise and fall in unison.

Aside from air, I have seen a restriction in the radiator cause the lower hose to try and collapse at higher rpm and I have also seen thermostats that will only open partially at their rated temperature.

I would suggest testing the system without a thermostat and verifying your in-dash gauge with an underhood or in-car mechanical guage.

I hope this helps....Robert
Attached Thumbnails
is this temperature too high?-142-degrees-95-degrees-ambient.jpg   is this temperature too high?-mbz-007.jpg  
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Did you just pass my 740 at 200 kmh in a 300SD?????

1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013



100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership
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  #24  
Old 08-22-2011, 04:44 PM
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yeah gonna inspect the radiator next week and test it for flow it's 30 so I hope that's the problem.
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  #25  
Old 08-22-2011, 05:36 PM
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Good luck with that!!!!!!!
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Did you just pass my 740 at 200 kmh in a 300SD?????

1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013



100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership
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  #26  
Old 08-24-2011, 07:07 PM
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Here is what my temps look like with the 80C thermostat installed on a 100F+ day at idle with the A/C on. Mechanical gauge says 182F...Robert
Attached Thumbnails
is this temperature too high?-182-degrees.jpg  
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Did you just pass my 740 at 200 kmh in a 300SD?????

1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013



100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership
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  #27  
Old 08-24-2011, 09:09 PM
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Exactly where it needs to be.


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