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Old 09-23-2015, 06:54 PM   #1
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Oil lines, tell me what you think

The 310 has an internal Oil and tranny fluid cooler in the Radiator.
Look at these oil lines, they really look a lot worse than they are. Its just the outer real thin rubber layer thats peeling off.
I am torn between rebuild the lines or wait til I add an external and prob more efficient oil cooler. No sign of a leak and i hate mess with stuff thats working despite the horrible appearance.
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Old 09-23-2015, 07:25 PM   #2
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Oil lines, tell me what you think

I'd replace them. Just getting old and brittle. The interior is probably pretty deteriorated as well. Keep in mind the transmission is designed to run near the coolant temperature. The heat exchanger works both ways. It warms up the oil when cold. The clutches tend to slip when the fluid is cold. Doesn't take much on a heavy vehicle to damage them. If you put an external cooler on, put in in series to remove heat from the fluid before the radiator. It will keep your coolant temperature down.
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Old 09-23-2015, 07:31 PM   #3
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Quote:
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I'd replace them. Just getting old and brittle. The interior is probably pretty deteriorated as well. Keep in mind the transmission is designed to run near the coolant temperature. The heat exchanger works both ways. It warms up the oil when cold. The clutches tend to slip when the fluid is cold. Doesn't take much on a heavy vehicle to damage them. If you put an external cooler on, put in in series to remove heat from the fluid before the radiator. It will keep your coolant temperature down.
Thanks for your input, Kota! These are engines oil lines going to the passenger side of the radiator.
The transmission lines are steel running from the Tranny directly to the drivers side of the Radiator.
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Old 09-23-2015, 09:45 PM   #4
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On any older vehicle-first thing you do is change all fluids/filters and rubbers(belts, hoses etc)
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Old 09-23-2015, 11:56 PM   #5
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I had a GMC motorhome with the olds 455 engine. Suddenly, about 10 miles from home one of the engine oil cooler lines broke. All the oil pumped out in a few seconds. I was fortunate to have a pullout right next to where it happened.

It would have totaled the engine had I not stopped immediately. I got lucky.

Replace them now!
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Old 09-24-2015, 08:51 AM   #6
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you guys just don't want to give me a break, just be like that
Perfect hoses...
Whilst I was messing with the fittings by the oil cooler, I found a GM rebuilt label with all 0 over bore. You would think that they would have replaced those hoses at that time...
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Old 09-24-2015, 09:25 AM   #7
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The biggest danger regarding a blown oil hose might be a rapid spray on hot exhaust components maybe resulting in an inferno....

Change the hoses, have some professionally made. There is an excellent place here in Little Rock that will make any hose while you wait for a price that wont break the bank. You should find a similar place.


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Old 09-24-2015, 09:52 AM   #8
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Yep, you need to replace them!

Just wanted to add my $0.02 to the subject
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Old 09-24-2015, 12:33 PM   #9
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FYI - GM oil cooler hoses are the Achilles Heel of all GM vehicles. This is especially true of trucks.

You want NEW. Think of your motor. You want results, not a bargain.

Tom
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Old 09-24-2015, 03:38 PM   #10
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Glad you replaced them.... right answer.
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Old 09-24-2015, 04:12 PM   #11
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99.60 for the 2 hoses, my labor free as usual..
What a pain to get to the 2 fittings by the oil cooler
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Old 09-24-2015, 08:48 PM   #12
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Quote:
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you guys just don't want to give me a break, just be like that
Well, never ask a question to which you do not really wish to know the answer.

Glad you replaced them, it was the right thing to do.
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Old 09-24-2015, 11:13 PM   #13
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99.60 for the 2 hoses
That's cheap at twice the price.

Save the old hoses for spares. You just never know.....

Tom
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Old 09-25-2015, 04:05 PM   #14
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trans lines

Is the radiator new or rebuilt? I would worry more about oil from the cooler leaking into the radiator and water leaking into the transmission fluid. Transmissions are very expensive.
Start twisting the old lines and who knows what you loosen? i WOULD GO WITH A SEPARATE TRANSMISSION COOLER AND NEW LINES
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