MBE 900 – Section 3.6 Heat Exchanger

Section 3.6
Heat Exchanger

‪

Section 3.6.1
Heat Exchanger Removal

Remove the heat exchanger as follows:‪

HOT COOLANT ‪
To avoid scalding from the expulsion of hot coolant, never remove the cooling system pressure cap while the engine is at operating temperature. Wear adequate protective clothing (face shield, rubber gloves, apron, and boots). Remove the cap slowly to relieve pressure.‪

1. When the engine is cool, drain the coolant from the radiator.

   Note: If the cooling system is rusty, it should be flushed.

2. Remove the oil filter cap. See Figure "Heat Exchanger Assembly (typical)" . Inspect the seal for damage and replace if necessary.
   

   1. Oil Filter Housing‪	8. Seal‪
   2. Oil Filter Element‪	9. Screw Plug‪
   3. O-ring‪	10. Housing Cover Bolt‪
   4. Oil Filter Cap‪	11. Housing Cover‪
   5. Wiring Harness‪	12. Housing Cover Gasket‪
   6. Gasket‪	13. Heat Exchanger‪
   7. Oil-Water Heat Exchanger‪

   Figure 1. Heat Exchanger Assembly (typical)

3. Remove the air cleaner hose.
4. Cut the wiring tie strap at the vent line.

   PERSONAL INJURY ‪
   To avoid injury from the sudden release of a high-pressure hose connection, wear a face shield or goggles.‪

5. Remove the vent line from the connection at the coolant pump to cylinder head, and from the oil separator.
6. Disconnect the wiring connector from the oil temperature sensor.
7. Disconnect the oil pressure line from the oil filter housing and the turbocharger.
8. Remove the seal plug and seal from the heat exchanger. Discard the seal. Drain the oil into a suitable container.
9. Remove the heat exchanger from the cylinder block. Discard the gasket.
10. Remove the housing cover and discard the gasket.

Section 3.6.2
Heat Exchanger Installation

Install the heat exchanger as follows:‪

1. Install the housing cover and a new housing cover gasket on the heat exchanger. Do not tighten the housing cover bolt at this time.
2. Install the heat exchanger and a new gasket on the cylinder block. Tighten the mounting bolts 25 N·m (18 lb·ft).
3. Tighten the housing cover bolt 25 N·m (18 lb·ft).
4. Install the screw plug with a new seal. Tighten the plug 20 N·m (15 lb·ft).
5. Attach the oil pressure line to the oil filter and the turbocharger.
6. Connect the wiring harness to the oil temperature sensor.
7. Attach the vent line to the connection at the coolant pump to cylinder head, and to the oil separator.
8. Using a new tie strap, attach the wiring harness to the vent line.
9. Install the air cleaner hose.
10. Install the oil filter cap. Replace the O-ring. Tighten the cap 25 N·m (18 lb·ft).
11. Fill the cooling system.
12. Fill the engine oil circuit.

    PERSONAL INJURY ‪
    To avoid injury before starting and running the engine, ensure the vehicle is parked on a level surface, parking brake is set, and the wheels are blocked.‪

    PERSONAL INJURY ‪
    Diesel engine exhaust and some of its constituents are known to the State of California to cause cancer, birth defects, and other reproductive harm.‪ Always start and operate an engine in a well ventilated area. If operating an engine in an enclosed area, vent the exhaust to the outside. Do not modify or tamper with the exhaust system or emission control system.

13. Start the engine. Check the gauge for the correct oil pressure; check the lubrication system for leaks.