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  #61  
Old 08-06-2015, 11:18 AM
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Quote:
Originally Posted by funola View Post
When are you going to replace the T stat?
Not entirely sure - probably this fall. I'm not terribly concerned about the situation based on the likely frequency in which these things fail open, with no reported negative effects. Probably before the next road trip to Chatanooga in October.

I'm also keying on what our friends in the aircraft industry see as "normal oil temperature" where their operating conditions are even more critical than ours.



Also kind of waiting to see what your results are... Can't say I'm looking forward to pulling the filter housing to replace it.

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Oil Cooler Thermostat Replacement-image.jpg  
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  #62  
Old 08-06-2015, 11:32 AM
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I am not looking forward to replacing mine either. I am not going to do the job until I see at least one car where it passes the FSM oil cooler T stat test. From studying the T stat on my spare filter housing, my current opinion is that the slow warm up of the oil cooler on my 85 is consistent with how I think it should operate. That's why I want to see a car that operates per the FSM test so I can change my mind.
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  #63  
Old 10-23-2017, 04:59 PM
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Any chance if anyone knows if the 617 part is the same for the 603 oil thermostats.
My dealer says 6031800075 and 603180007581 are not in stock anymore anywhere.
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  #64  
Old 04-29-2018, 07:53 PM
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Old thread...going back to my only summer car once again.
My question: Can the oil thermostat be removed and operate just fine without it?
This car will not be seeing winters and only operate in warm weather.
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87 300SDL
87 190D 2.5NA 5sp
90 300GD with 606 turbo!
08 GL320 CDI
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Past rides:
82 300SD - the one that started it all!
81 240D
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  #65  
Old 04-29-2018, 09:22 PM
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Quote:
Originally Posted by bentrod View Post
Any chance if anyone knows if the 617 part is the same for the 603 oil thermostats.
My dealer says 6031800075 and 603180007581 are not in stock anymore anywhere.
You might look on eBay or UK eBay.
Get a whole Oil Filter Housing from the Junk Yard or on ebay.

Section 18-005 Oil Circuit and pressure in the service manual has pics of the oil flow.
I don't know if this site still works or not.
W123 Service Manual
https://www.startekinfo.com/StarTek/outside/12265/?requestedDocId=12265

On the surface it looks like if you remove the thermostat oil flows into the oil cooler but at the same time is will also be going directly to the Oil Filter. But, it is hard to tell.
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  #66  
Old 04-29-2018, 09:44 PM
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Do you actually have a problem?
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  #67  
Old 04-29-2018, 09:46 PM
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Quote:
Originally Posted by Diesel911 View Post
On the surface it looks like if you remove the thermostat oil flows into the oil cooler but at the same time is will also be going directly to the Oil Filter. But, it is hard to tell.
That is exactly what I'm trying to figure out, the flow characteristics.
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---------------------------------
87 300SDL
87 190D 2.5NA 5sp
90 300GD with 606 turbo!
08 GL320 CDI
12 ML350 Bluetec
---------------------------------
Past rides:
82 300SD - the one that started it all!
81 240D
87 300SDL - the first one.
92 300D 2.5 Turbo
99 E300 Turbodiesel
07 E320 Bluetec
12 S350 Bluetec
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  #68  
Old 05-01-2018, 12:19 PM
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I wonder if there is an external oil thermostat that could be fitted? When someone adds an external oil cooler to (for instance) a race car, do they also add a thermostat?
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  #69  
Old 05-01-2018, 12:20 PM
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Sure enough, Prof. Google know all....

https://www.summitracing.com/search/part-type/remote-oil-thermostats
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'87 124.193 (300TD) "White Whale", ~392k miles, 3.5l IP fitted
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'73 Balboa 20 "Sanctification"
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  #70  
Old 05-01-2018, 02:18 PM
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Considering the below comment from another forum: "Oil Cooler Thermostat helps your engine's oil come up to temperature quickly and holds it at the right temperature. Cold oil does not flow and does not lubricate correctly. Plus, moving cold oil robs power. This thermostat is designed to bypass the cooler until the oil reaches 215°. At 215° water condensation in the oil will evaporate and the oil will be warm enough to flow and lubricate properly.. "

Please disreguard the temp in the above paragraph. I say that because the Oil Cooler on my Chevy van runs through the Radiator meaing the Oil Temp is controled by the Coolant temp wich is around 180 degrees F.

Doesn’t multi-viscosity Oil decrease or totally eliminate the detrimental effects of cold Oil?
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Last edited by Diesel911; 05-01-2018 at 02:34 PM.
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  #71  
Old 05-01-2018, 08:08 PM
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Thanks for the replies.
The temperature equation is interesting, but, I'm most concern on flow.
I was looking at this oil filter housing diagram and the directional flow of the oil does not seem so simple.
I'm thinking now if I remove the oil temp stat the oil may go in the wrong direction or not cool correctly.
I'm back at looking for a good price on a complete oil filter housing.
Junk yard ones can be had but a 30 plus year old part might have a bad oil temp stat in it as well and I'll loose more time in labor. I like working on my car but I don't want to install a mystery part and do the job multiple times.
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Oil Cooler Thermostat Replacement-oil_flow_diagram_60x.jpg  
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---------------------------------
87 300SDL
87 190D 2.5NA 5sp
90 300GD with 606 turbo!
08 GL320 CDI
12 ML350 Bluetec
---------------------------------
Past rides:
82 300SD - the one that started it all!
81 240D
87 300SDL - the first one.
92 300D 2.5 Turbo
99 E300 Turbodiesel
07 E320 Bluetec
12 S350 Bluetec
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  #72  
Old 05-01-2018, 09:02 PM
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This is a single poppet thermostat, similar to the coolant thermostats used in traditional American engines. The way it works is that the bypass passage is always open. The primary passage is in the direct line of flow, and is controlled by the thermostat. When the thermostat opens, dynamic pressure tends to force flow preferentially through the primary passage. This increases pressure in the bypass passage (because of return flow from the cooler), which results in most of the flow going through the primary. You wouldn't think it, but it's almost as efficient as a dual poppet design.

The passage sizes are critical for all this to operate correctly. Removing the thermostat is unlikely to yield good results.

Why did you want to do this again?
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Oil Cooler Thermostat Replacement-singlepoppet.jpg   Oil Cooler Thermostat Replacement-housing.jpg  
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  #73  
Old 05-01-2018, 09:33 PM
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Quote:
Originally Posted by Diesel911 View Post

Doesn’t multi-viscosity Oil decrease or totally eliminate the detrimental effects of cold Oil?
Absolutely not. Even with 0W synthetic, oil viscosity is more than ten times higher at room temperature than 180F. Engine wear is minimized at an oil temp of between 170-215F. I think the only reason you would need oil cooling on these piddly engines is that the turbo engines have piston oilers. even then, I would guess that it's not all that important. Nuf said.

https://wiki.anton-paar.com/en/engine-oil/
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  #74  
Old 05-01-2018, 09:53 PM
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Quote:
Originally Posted by Mxfrank View Post

Why did you want to do this again?
I have zero flow to my oil cooler.
Keep in mind I have had a few of these cars and yes I have driven it uphill, fully warmed up.
The entire oil cooler and its hoses are just outside temperature.
__________________
---------------------------------
87 300SDL
87 190D 2.5NA 5sp
90 300GD with 606 turbo!
08 GL320 CDI
12 ML350 Bluetec
---------------------------------
Past rides:
82 300SD - the one that started it all!
81 240D
87 300SDL - the first one.
92 300D 2.5 Turbo
99 E300 Turbodiesel
07 E320 Bluetec
12 S350 Bluetec
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  #75  
Old 05-01-2018, 11:06 PM
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What's the temperature of the cannister? Unless your oil is running hotter than your coolant, the thermostat may never open.

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