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6.5L Diesel Engine Discuss the 6.5 GM diesel engine & associated components. Automatic transmission questions & problems belong in the 4L80/85 - 4L60E - 6L90 Transmission Forum

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Old 03-29-2019, 10:10 AM   #1 (permalink)
Greg S
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Oil cooler lines on a 3500HD

These damn things are leaking again. Has anyone successfully flared the aluminum hard lines on these to an AN 37 degree flare with a nut and ferrule. I want to replace only the rubber part - they all leak from the rubber to aluminum crimp.


Thanks




Greg

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Old 03-31-2019, 04:12 PM   #2 (permalink)
MyShibby65TD
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Which cooler lines are you referring to? I don't think the LLY has an oil cooler, just a transmission cooler.


You can replace the transmission cooler lines with some alligator performance AN lines if you'd like. https://www.alligatorperformance.com...-05-gm-duramax

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4" DE, trans cooler & 8AN lines, 10AN oil cooler lines, nylon fuel lines, AD244, LB7 fan, Medallion marine injectors, OPS relay, glow plug override, OPS override
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Old 04-01-2019, 11:12 AM   #3 (permalink)
Greg S
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Quote:
Originally Posted by MyShibby65TD View Post
Which cooler lines are you referring to? I don't think the LLY has an oil cooler, just a transmission cooler.


You can replace the transmission cooler lines with some alligator performance AN lines if you'd like. https://www.alligatorperformance.com...-05-gm-duramax


Duh! I posted this in the wrong forum. This is for a truck at work with the 6.5 Turbo Diesel in it. I was I this forum because my tow rig is a Duramax.


Greg
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PPE tune, AFE Intake, SS Highflow exhaust
Uprated Allison Trans, Kennedy Air springs
55 Gallon fuel tank, Gooseneck Trailer hitch

Last edited by OkDually; 04-01-2019 at 11:28 AM. Reason: mpv
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Old 04-01-2019, 11:30 AM   #4 (permalink)
OkDually
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Thread relocated over to 6.5L
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1996 K3500 6.5L,( "F" Eng #141 cast block) 5 speed manual, crewcab, dually longbed: 208,000mi.
Diamond Eye 4" Turbo Back Exhaust w/2.5" Flo-Pro Crossover
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Old 04-01-2019, 11:41 AM   #5 (permalink)
Greg S
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Thanks, I looked at the FAQ and see the two vendors who make the oil cooler replacement line kits. Des anyone have any drawbacks to going with them? Is it easy enough to secure the hoses so that they don't get damaged or saw through anything on the truck?


Greg
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PPE tune, AFE Intake, SS Highflow exhaust
Uprated Allison Trans, Kennedy Air springs
55 Gallon fuel tank, Gooseneck Trailer hitch
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Old 04-01-2019, 11:44 AM   #6 (permalink)
OkDually
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Quote:
Originally Posted by Greg S View Post
Thanks, I looked at the FAQ and see the two vendors who make the oil cooler replacement line kits. Des anyone have any drawbacks to going with them? Is it easy enough to secure the hoses so that they don't get damaged or saw through anything on the truck?


Greg
Either one mentioned is the recommended kit to use.

There is a thread on the oil cooler lines upgrade with pics listed in the FAQ
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1996 K3500 6.5L,( "F" Eng #141 cast block) 5 speed manual, crewcab, dually longbed: 208,000mi.
Diamond Eye 4" Turbo Back Exhaust w/2.5" Flo-Pro Crossover
AirDog II DF165 w/ tank sock delete - XDP
TD-Max boost controller - Kennedy Diesel
OPS extension hose - Leroy Diesel
Glow Plug Harness- PT Wiring Solutions
Glowshift Maxtow EGT,Boost, Fuel gauges
Boost & Fuel Pressure Bolts - Leroy Diesel
2/0 Battery Cable Upgrade - PT Wiring Solutions
PMD w/#9 resistor and Re-Location Kit, mounted to bumper - Leroy Diesel
GM-5 Turbocharger
4.10 gear ratio
OptiLube summer + Formula


Proud member #1039 of The 3500 Dually Club


Last edited by OkDually; 04-01-2019 at 11:45 AM.
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Old 04-01-2019, 11:46 AM   #7 (permalink)
jnlperformance
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You can make your own lines for much cheaper....

Npt to an -3

Summitracing.com
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Old 04-01-2019, 11:55 AM   #8 (permalink)
jabon056
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What I did...

I used 1/2 compression to male AN fitting. I then made a steel braided hoses, no leaks so far. Mine's a 1994, so I cut the fittings off old lines to the oil cooler, after the 90* bent so I had a straight line and used compression to AN there. On the motor end I installed 2 90* elbows and attached hose. You can cut hard lines and install compression fittings there and make a hose to connect the 2 ends.
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Old 04-01-2019, 05:14 PM   #9 (permalink)
Greg S
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Quote:
Originally Posted by jabon056 View Post
I used 1/2 compression to male AN fitting. I then made a steel braided hoses, no leaks so far. Mine's a 1994, so I cut the fittings off old lines to the oil cooler, after the 90* bent so I had a straight line and used compression to AN there. On the motor end I installed 2 90* elbows and attached hose. You can cut hard lines and install compression fittings there and make a hose to connect the 2 ends.

Similar to what I was thinking of doing. I was going to use a 37 degree nut and ferrule then flare the OEM tubing. Then you can just buy premade hose with male 37 degree ends on them or makeup your own. My issue is always leakage at the crimping on the OEM hoses. I have never had a filure at the block of cooler. The truck has 660,000 miles on Chassis and 396,000 on the motor.
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PPE tune, AFE Intake, SS Highflow exhaust
Uprated Allison Trans, Kennedy Air springs
55 Gallon fuel tank, Gooseneck Trailer hitch
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Old 04-01-2019, 05:15 PM   #10 (permalink)
Greg S
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Quote:
Originally Posted by jnlperformance View Post
You can make your own lines for much cheaper....

Npt to an -3

Summitracing.com

You mean AN 8 or -10 or so, no?

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Uprated Allison Trans, Kennedy Air springs
55 Gallon fuel tank, Gooseneck Trailer hitch
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