Preheater - Function And Leak-Tightness Check - MTU 16V4000M73 Operating Instructions Manual

8.17.11 Preheater – Function and leak-tightness check
Preconditions
☑ Preheater is switched on.
Checking operation
Note: The coolant temperature must be within the range of the thermostat when the preheater is ready for opera-
tion.
1. Check coolant preheating temperature.
2. Set the thermostat to the relevant temperatures if they are out of range.
Checking heating element(s) (electrical)
u
(→ Page 255)
Checking for leaks
1. Check leak-tightness at coolant inlet and outlet.
2. Tighten any leaking unions.
254 | Coolant System, General, High-Temperature Circuit | MS150123/01E 2017-05