Is it critical to have an oil cooler for a turbo engine? I just recently installed a turbo 602 and i'm in the process of finalizing essential stuff. There are 2 lines that have been temporarily closed coming out of the oil filter housing, I'm guessing it's for an oil cooler. Do I have to have one installed immediately? Thanks

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85 190E 2.3(SOLD)
86 230E (-->300D) sold
87 300D (-->300TD) sold
68 250S w/ a 615 and manual tranny (RIP)
87 300TD (SOLD)
95 S280 "The KRAKEN" (Turbo 2.9 602 transplant) traded
86 190E 2.3... current project

Anyone?

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85 190E 2.3(SOLD)
86 230E (-->300D) sold
87 300D (-->300TD) sold
68 250S w/ a 615 and manual tranny (RIP)
87 300TD (SOLD)
95 S280 "The KRAKEN" (Turbo 2.9 602 transplant) traded
86 190E 2.3... current project

The engine oil lubricates the engine and takes away heat from the combustion process and friction from the moving parts. also removes heat from the pistons with the oil squirters and the oil that lubricates the turbo bearing.


there is a thermostat in the oil filter housing to control the flow of oil to the oil cooler to cool it, the same way the engine has a thermostat to control the the temp of the coolant via the radiator.

so yes it is a good idea to add the oil cooler.


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

Especially with a turbo making tons of heat, but it's always a good idea to have a cooler...

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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

I am pretty sure (but unfortunately unable to verify for certain) that my 4 cyl diesel does not have an oil cooler. Later 220Ds got them, but not my car. Your turbo engine will have more fuel burned per cylinder volume than a NA engine, and adequate cooling is always important, but if it is a temporary thing, I bet using an oil cooler is unnecessary. Just change the oil a little sooner than you normally would, and call it a day.

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1968 220D, w115, /8, OM615, Automatic transmission.
My 1987 300TD wagon was sold and my 2003 W210 E320 wagon was totaled (sheds tear).

While it is not "critical" to have oil cooling, it is desirable, particularly for a boosted diesel. But what IS critical is that the two oil fittings that go to and return from a cooler, MUST be connected to each other with an appropriate hose in lieu of a cooler installation. The oil thermostat in the filter base closes off the cooler bypass connection when the connection to the cooler is opened. Hence, if the cooler fittings are blocked when the thermostat opens to the cooler circuit, the oil supply to the bearings, etc., will be interrupted.
NOT GOOD!!

IIRC, you can block the cooler lines and oil will bypass into the filter housing. I am not aware of any cooler that uses 'proprietary' oil pressure for circulation...Robert

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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

Oil temp and coolant temp run about the same in the car.
So if your coolant system is excellent and you're not running hot chances are your oil is cool enough. Ambient temp and engine load would have big weight in making this decision. If you live in Arizona and frequently tow up hills... Well.. Put the cooler in.

I live in Canada and block my rad with cardboard in the winter... I also block my oil cooler with a piece of cardboard. I am pretty sure I can get away with no engine oil cooler. Also don't really need AC up here except for maybe 3 weeks of the year.

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Cheers!
Scott McPhee

1987 300D

MB manuals warn of the very problem which I described. The alternate solution, which is described in the FSM, is to remove the thermostat entirely, in which case the cooler fittings may be blocked.

Which FSM are you getting this from? I have the FSM for the 617.95 Turbo Engine, and don`t see a reference you mention.

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

Oil Cools the Turbocharger and Oil sprays up into a Chamber inside of the Piston Head to cool the Pistons. The Engine Coolant does not cool either the Turbo or the Piston heads and the heat that the Oil removes from them has to go some where.

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84 300D, 82 Volvo 244Gl Diesel

If you end up doing without the oil cooler, I recommend installing an oil temperature gauge and keeping an eye on it. The sender could fit in place of the oil drain plug so you don't have to drill any holes. While this may not be the ideal (hottest) place for the sender, it's easier, making it more likely that you'll actually do it. Additionally, you're really looking for a relative indication comparing "normal" temperatures in mild weather with no load to high-speed driving uphill towing a trailer in 100F summer heat. Clearly the latter situation mandates use of an oil cooler and Mr. McPhee's situation doesn't. Where do you draw the line? A temperature gauge may help you with that decision.

Jeremy

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970

In post #10, charmalu fairly asks for the source of my warning about blanked oil cooler circuits. My citation is from the FSMs for M110, and for M116/117 engines, Section 18. Neither, of course, is for the OM602 which is the subject of this thread, but then neither is the OM617 cited by charmalu!

Draw??

The description of the oil thermostat operation in the 617.95 engine manual would appear to support the argument against obstructing the design oil cooler flow. Which may or may not have any application to the subject engine.

In concept, blocking the oil cooler hoses on a 617.95 engine would be similar to blocking the radiator hoses, but leaving the bypass thermostat in place.

If you don't use the Oil Cooler loop the Hoses together so that Oil flows through the Hoses normally.

I don't know about in PI but if there is room one of those Generic Oil Coolers would work. However, you would need to modify your Hoses and of course find a place to mount it.

You never said what happend to the Original Oil Cooler. If we knew someone might be able to recommend a repair.

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84 300D, 82 Volvo 244Gl Diesel