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#1
11-16-2012, 04:40 AM
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Oil cooler issue
So after a good drive i open my hood while the engine is running and notice my oil cooler is stone cold! Im used to it being about as hot as the radiator. it is in the 50's here in texas. my oil pressure is perfect and the oil cooler has always been hot. I have heard there is some type of thermostat for the oil cooler? what temp should it open at? I have an IR thermometer and the side of my filter housing is about 80 celcius and the cooler is the same as ambient temp.
 I dont get it! Im going out of town for Thanksgiving and dont want my engine oil getting so hot that it looses its ability to lubricate well. Any help would be great! 
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#2
11-16-2012, 09:58 AM
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Yes, there is a thermostat in the oil filter housing. Controlling temperatures are listed in a thread on here somewhere but I can't remember the figure. Search on 'oil thermostat'. I think it's just not hot enough for the thermostat to open. I don't think you have to worry about driving this time of year. Lots of these engines were sold without oil coolers. Driving across Texas in midsummer at 120mph with the AC on might be another issue.
__________________
1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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#3
11-16-2012, 11:50 AM
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You show a 1983 Mercedes 300cd in your profile.
A turboed Engine should have a working Oil Cooler. Likely OK for driving around Town till fixed. Locate a place to get the Part first. The Oil Filter Housing has to come off to get at the Thermostat. The Stock Block to Housing Gasket is really nicely made. There should be pics of the Gasket in the below thread. Fuel Injection Pump Removal with the Oil Filter still on 617.952 Fuel Injection Pump Removal with the Oil Filter still on 617.952
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84 300D, 82 Volvo 244Gl Diesel
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#4
11-16-2012, 12:41 PM
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I doubt there is anything wrong with your thermostat in the oil cooler. It has a wax pellet inside of it and is controlled by the temp of the oil.
Starts to open at 110C 230F, and fully open at 123C 253F + -. Get an IFR lazer pointer temp thermometer and check the temp of the oil filter housing after a drive when you feel the oil cooler is not warm enough. Charlie
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there were three HP ratings on the OM616... 1) Not much power 2) Even less power 3) Not nearly enough power!! 240D w/auto Anyone that thinks a 240D is slow drives too fast. 80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works
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#6
11-16-2012, 12:55 PM
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For winter driving I agree you shouldn't have any issues.
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#7
11-16-2012, 03:56 PM
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Ok, how can i heat up my oil to test this? After a good drive on the highway (going 75) i quickly exited and checked my oil filter housing temp and it was 83 celcius. The oil cooler was still stone cold! hmm...
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#10
11-16-2012, 04:10 PM
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or put a piece of cardboard in front of the radiator. Or build a fire under the engine before going for a drive
__________________
1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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#11
11-16-2012, 04:16 PM
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Ok, i like the fire idea
 After hearing 110C is when the thermostat opens up, im not too worried anymore. I just remember in the summer after every drive the oil cooler would be too hot to touch. I will keep checking the temp of my filter housing though. Thank you all for the help!
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#13
11-16-2012, 04:48 PM
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Quote:
(nudge-nudge)  I have a nice reman Bosch on my car at the moment, but I still like to read about this stuff.
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- K.C.Adams '77 300D Euro Delivery OM617 turbo / 4-speed swap 404 Milanbraun Metallic / 134 Dattel MB-Tex Current status: * Undergoing body work My '77 300D progress thread
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#14
11-16-2012, 08:11 PM
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Quote:
The above means that He checks that once in a while (something I don't do) and I believe His symptoms. But, it does call for a more conclusive check. Another Member mentioned the Wax Pellet inside of the Oil Cooler Thermostat. That is similar to how the Coolent Thermostat and they fail sometimes; so the same can happen to the Oil Temp Thermostat.
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84 300D, 82 Volvo 244Gl Diesel
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#15
11-16-2012, 08:14 PM
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So would i post it like how i did this one? I did a lot of research here on the forum but have not seen a GM alternator installed. I needed higher amperage for stereo, 100/80w hella and i just ordered some HID bulbs and 5 3/4 Hella e code reflectors to replace my yellow fog lights
I could just start an electrical upgrade/ modification thread?
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