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Old 12-04-2019, 08:04 PM
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Join Date: Nov 2002
Location: San Diego
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250SE Coolant System Routing?

Hey guys, I'm wondering if someone on here could shed some light on some cooling system routing for a 250SE? I had some replacement coolant pipes fabricated for my 250SE that has been sitting for years. It has been awhile since the cooling system was disassembled and I don't remember all of the details about what goes where.

There is a hard cooling pipe that routes around the front of the oil pan and goes over to what looks like an expansion tank on the driver side of the engine bay. There is a nipple on the top of it. Can anyone tell me what attaches to that point?

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Old 12-05-2019, 11:08 AM
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Speaking from experience with a 250S I'll tell you what I remember. The car has a heat exchanger to the driver side of the engine, water goes in it and oil goes in it. I don't remember the plumbing for it except that I needed the setup (putting a 280 engine in a 250, the 280 has the oil cooler next to radiator) and it involved stuff coming from the oil filter and going god knows where. Wish I could remember. If I have a pic I'll post it...
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Old 12-05-2019, 11:12 AM
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oil cooler for 250S

I found some pictures. This is a 280S engine using a 250S oil cooling system. Sorry, they aren't pretty, but may answer a few questions.
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250SE Coolant System Routing?-oilfilteroilcooler1.jpg   250SE Coolant System Routing?-oilfilteroilcooler2.jpg   250SE Coolant System Routing?-oilfilteroilcooler3.jpg   250SE Coolant System Routing?-oilfilteroilcooler4.jpg   250SE Coolant System Routing?-oilfilteroilcooler5.jpg  

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Old 12-05-2019, 11:13 AM
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last ones.
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250SE Coolant System Routing?-oilfilteroilcooler6.jpg   250SE Coolant System Routing?-oilfilteroilcooler7.jpg  
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Old 12-05-2019, 11:46 AM
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Join Date: Nov 2002
Location: San Diego
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Quote:
Originally Posted by ScooterABC View Post
I found some pictures. This is a 280S engine using a 250S oil cooling system. Sorry, they aren't pretty, but may answer a few questions.
That first picture is the trick! Now my car has that nipple on the left side, but it appears blocked? I just assumed it wasn't used. I guess I will investigate and see if its plugged or what the status is.

Side note, just found out cylinder 4 has 75% leak down with burnt exhaust valves. Ugh, guess the head is now coming off.

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