M11 Series – Service Manual – 007-003   Lubricating Oil Cooler

NOTE: Do

not attempt to repair a defective oil cooler. A defective oil cooler

must be replaced.

Some applications can require turbocharger removal.

Refer to Procedure 010-033.

Drain the cooling system.

Refer to Procedure 008-018.

Remove the turbocharger oil supply line from the lubricating oil filter head.

Remove the turbocharger drain line from the turbocharger. Remove the support bracket capscrew.

Remove the four oil cooler thermostat housing flange capscrews.

Remove the four oil cooler mounting capscrews, oil cooler, and gaskets.

Remove the oil cooler water inlet and outlet tubes and the mounting flange.

NOTE: Do

not allow dirt to enter the oil passages when cleaning the oil cooler.

Use solvent to clean the oil cooler. Dry with compressed air.

Use lubricating oil cooler pressure test kit, Part No. 3376861, to seal the oil passages.

Install pressure test plate, Part No. 3376889, on one of the two oil passage openings.

Attach an air pressure line to the test plate, and blow the oil from inside the oil passages.

Install the other pressure test plate to seal the oil passage openings.

NOTE: Both oil passage openings

must be sealed before cleaning the water core of the oil cooler.

Use a water system cleaner, attached to the water outlet side of the housing, to clean the water core.

Install the two test plates and gaskets from lubricating oil cooler pressure test kit, Part No. 3376861, to the oil passage openings of the oil cooler housing.

Install a regulated air pressure line to test plate, Part No. 3376889, and apply air pressure.

Install the oil cooler in a tank of heated water and inspect for leaks.

If leaks are found, the oil cooler

must be replaced.

Remove the oil cooler from the water tank.

Dry the oil cooler with compressed air.

Remove the pressure test equipment.

Install two new o-rings on the oil cooler water inlet and outlet transfer tubes.

Lubricate the o-rings with clean 15W-40 engine oil.

While holding the mounting flange in place, install both transfer tubes into the oil cooler as far as possible. The straight sides of the transfer tube flanges

must face each other when installed.

Install two new o-rings on the ends of the oil cooler water transfer tubes.

Lubricate the o-rings with clean 15W-40 engine oil.

Install two new gaskets on the lubricating oil filter head.

Install the oil cooler on the engine, and tighten the mounting capscrews.

Install the four oil cooler thermostat mounting flange capscrews. Tighten the capscrews alternately and evenly.

Install the turbocharger drain line and support bracket.

Install the turbocharger oil supply line to the lubricating oil filter head.

Fill the cooling system.

Refer to Procedure 008-018.

Operate the engine to normal operating temperature and check for oil and coolant leaks.