Cylinder Head Gasket, Check for Leaks (CO 2 in Cooling System) Using Tester MKM-601 and indicator fluid, leaks of the cylinder head gasket or cylinder head can be detected easily. The function of the tester is based on the blue indicator fluid turning to yellow in the reaction vessel, caused by combustion gas entering the coolant circuit. Before performing the leak test, check cooling system for brittle and loose coolant hoses and other damages. Release pressure in cooling system by opening of closure cover on coolant compensation tank.
 Remove, Disconnect Place Adapter KM-471 (1) on coolant compensation tank. Insert universal plug (2) from Tool Set MKM-601 in KM-471 and fix universal plug in opening by pressing down both levers simultaneously (see illus. I). Attach connection piece (3) to universal plug and couple CO 2 tester (4) to adapter (illus. II). To avoid incorrect diagnosis, blow through connection piece and CO 2 tester before usage with compressed air. | 
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 Install, Connect Unscrew reaction vessel from CO 2 tester, fill to mark (arrow, illus. I) with blue reaction fluid and attach to CO 2 tester.
 Inspect Start engine and warm up to maximum operation temperature (until fan motor switches on). After build-up of pressure in the cooling system, let gas bubbles pass through blue indicator fluid for approx. 5 minutes. If indicator fluid turns yellow, the cylinder head gasket may be defective or the cylinder head damaged. Turning green or fading of blue colour is without significance. When in doubt about the colouring of the indicator fluid, carry out the following test for checking: Fill some blue fluid into the reaction vessel and breathe into it once or twice (CO 2 !). Close vessel with hand and shake vigorously. The fluid must clearly turn yellow, otherwise change indicator fluid.
Remove, Disconnect Remove CO 2 tester (1), adapter (2), universal plug (3) and adapter and close off compensation tank. Rinse tester with water after use (see illus. II). | 
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