4-16 SHB 28Z3 EN – Edition 2.0 * 28z3s410.fm
Engine
4.14 Oil pressure switch
☞ Remove the cable connection from the oil pressure switch (in the area of the cutoff
solenoid)
☞ Start the engine, check for correct idling speed
☞ Measure the resistance of the oil pressure switch as shown by means of an ohmmeter.
➥ Oil pressure switch OK: infinite resistance
➥ The oil pressure switch is defective if the oil can pass
The oil pressure can also be measured with a mechanical dial gauge
☞ Remove the oil pressure switch and replace with the dial gauge
☞ Start the diesel engine and measure the oil pressure
➥ Replace the oil pressure switch if defective or determine the cause for insufficient oil
pressure
4.15 Checking the coolant circuit
Leakage check
☞ Fill up the radiator completely
☞ Mount an adapter on the radiator as shown
☞ Increase the pressure in the cooling system by means of a hand pump to about 1 bar
(15 psi)
➥ Check the lines and the connections for leaks if the pressure drops at the pressure
gauge
Checking the radiator cap
☞ Remove the radiator cap and mount it onto the adapter as shown
☞ Increase the pressure to about 1 bar (15 psi) (stamped onto the radiator cap) with the
hand pump
➥ The radiator cap must open within this pressure range
4.16 Cleaning the cooling water channels
☞ Drain the coolant – see chapter Draining coolant on page 3-23
☞ Fill the cooling circuit with water
☞ Let the engine run at idling speed for about 5 – 10 minutes
☞ Drain the water from the cooling circuit again
☞ Refill the coolant – see chapter Checking/filling up coolant on page 3-22
4.17 Coolant and fuel hoses
☞ Check the coolant and fuel hoses regularly to ensure that they are not kinked, cracked
or damaged
➥ Renew coolant and fuel hoses every 2 years
Fig. 24: Oil pressure switch
Fig. 25: Checking the radiator for leaks
Fig. 26: Checking the radiator cap
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