159600-0420 ZEXEL 9 421 614 100 BOSCH ADJUSTING DEVICE 9421614100 1596000420 1910796511

At operating temperature, the engine coolant is hot and under pressure. Steam can cause personal injury. Check the coolant level only after the engine has been stopped and the fill cap is cool enough to touch with your bare hand. Remove the fill cap slowly to relieve pressure in the cooling system. Cooling system conditioner contains alkali. Avoid contact with skin and eyes to prevent personal injury.
1. Drain the coolant from the cooling system into a suitable container for storage or disposal.2. Remove the hose from the water temperature regulator housing. 3. Remove two bolts (1).4. Remove water temperature regulator housing (2) and the gasket from the cylinder head assembly. 5. Remove water temperature regulator (3) from the cylinder head assembly. The following steps are for the installation of the water temperature regulator.
If the water temperature regulator is installed wrong, it will cause the engine to overheat.
6. Put water temperature regulator (3) in position in the cylinder head assembly.7. Install a new gasket and water temperature regulator housing (2).8. Connect the hose to the water temperature regulator housing.9. Fill the cooling system with coolant to the correct level. See the topic "Cooling System" in the 3114 & 3116 ATAAC Diesel Truck Engine Operation & Maintenance Manual, Form No. SEBU6723.