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#1
11-02-2023, 11:09 PM
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Radiator replacement question 240D: Oil cooler
The JB weld repair did not work, so i ordered a new radiator, and not sure what to do about the oil cooler on the driver side of the radiator. There is a very inaccessible bolt at the bottom of that oil cooler.
The alternative seems to be to undo the hoses leading to this oil cooler. Then when the radiator/oil cooler are out, that bolt will be much easier to get at. Am i missing something here? Thanx for any advice or encouragement. a 
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#2
11-03-2023, 09:31 AM
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Yes remove the radiator and cooler as an assembly IF the oil cooler lines will break loose. If they are seized I'd try to leave the cooler lines connected and try to move them enough to access the bolt.
__________________
"Rudeness is a weak man's imitation of strength" - Eric Hoffer
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#3
11-03-2023, 11:13 AM
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I believe you should pursue leaving the oil lines attached to the oil cooler. The cooler is very thin aluminum and is very easy to break. Take your time and be patient and gentle.
__________________
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.  [SIGPIC]..I also have a 427 Cobra replica with an aluminum chassis.
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#4
11-03-2023, 11:21 AM
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X2 on tw's advice.
__________________
"Rudeness is a weak man's imitation of strength" - Eric Hoffer
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#5
11-03-2023, 05:06 PM
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Lower oil cooler bolt will not go back in
Got that lower oil cooler bolt out, but no way it is going back in. Spent nearly 2 hours twisting the bottom of the oil cooler this way and that. Cussed my lung out. NO WAY. So the oil cooler will be hanging by the top crimps.
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#6
11-03-2023, 07:02 PM
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Keep watch on the cooler hoses for leaks and cuts from the belts. I'm thinking that if they show signs of leakage you'd run less risk for engine damage by bypassing the cooler altogether. Many Benz diesels have met their demise due to oil cooler hoses failure.
__________________
"Rudeness is a weak man's imitation of strength" - Eric Hoffer
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#7
11-04-2023, 12:20 AM
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How do you bypass the oil cooler?
Seems like at least for the cool season, i could get by w/o that oil cooler. There is no A/C.
How would you bypass it?
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#8
11-04-2023, 01:51 PM
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If you live in a moderate to warm climate I think you'd be OK all year without the cooler if you use good oil and filters with regular oil changes. Living in the desert with constant high speed driving maybe not so. 220D's with OM615 power didn't have coolers and they ran forever and ever. Seasonal swapping from cooler to no cooler will create leaks and is messy.
To bypass the cooler a hose or pipe made at a hydraulic shop would loop the two connections at the oil filter housing together. Capping the oil filter housing oil cooler inlet and outlet should work too; but, I'm not 100% certain.
__________________
"Rudeness is a weak man's imitation of strength" - Eric Hoffer
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#9
11-04-2023, 08:30 PM
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Thanks!
I will give that bolt one more try, but if no success, i will try the bypass.
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#10
11-05-2023, 07:01 PM
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Suck cess!
Got the oil cooler bolt in today!
When i was struggling with it the other day, i was bending the bracket more and more with each unsuccessful attempt. I took the radiator out yet again, and bent that bracket so things could at least have a chance to line up. Then i found a tiny gap where i could actually see the bottom of the bolt thru the welded nut, so i was able to jostle the oil cooler just right to get it started. Tomorrow's project is to try to flush as much of the old antifreeze out of the block as possible, and fill with the right Zerex.
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