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Here's how the final coolant lines worked out. All lines are 1/2" stainless tubing. Fittings are flareless stainless.

I'm about 3/4 through this upgrade and will say this.... If your level of mechanical expertise is unbolting and swapping another part on, take it to a reputable mechanic who is experienced in custom work. This is not a straight forward swap! I will post pix and a parts list when I'm done.

I think that as Ron alluded to, as long as the plumbing to the coolant ports enters from a lower point and exits to a higher point, termosiphoning will occur. The premise per Garrett is that when the engine is shut down, the turbo housing heat soaks into the CHRA and the oil is no longer...

The center is positioned exactly like the original turbo. This is another CAT unit, made for the 3126. Oil feed and drain are positioned vertical, which puts the coolant horizontal.

That's where the issue may be. Recommended angle of the coolant ports is 20 degrees. Once the CHRA is rotated to match the existing LMTV manifold, oil feed, and drain lines, the coolant ports are near horizontal.

Think about what you wrote there....... The stock 3116 doesn't have water cooled turbo, so the oil still gets cooled by the exact same method. All the data out there points to water cooling primarily working after engine shut down when the turbo experiences heat sink. Proper plumbing allows the...

Again from Garrett: The input water (colder side, from the engine’s cooling system) should be plumbed into the lower of the two ports after the housing is rotated. The hotter output water leading back into the engine’s cooling system should be plumbed into the higher port and allowed to travel...

From the Garrett turbo page: While the engine is running and oil is flowing through the turbo’s bearing system, most of the transferred heat will be absorbed by the oil, preventing damage to the bearings and oil seals.

Does the 1079 have a transmission cooler? I thought that was strictly a 5T thing.

I'm putting in a 350HP marine turbo, governor and injectors. The new turbo CHRA comes with water cooling. Not running anything in there I think would make it prone to failure? I'm also no longer running the original air clutch fan, having switched to a commercial over-the-road electric truck...

Has anyone installed a water cooled turbo on a 3116? Where did you tie into the system? Garrett recommends the heater hoses.... Pics please!