MTU Detroit Diesel 183 Series Technical Publication page 510

Group 20
Subgroup 1030
Page 2
Degreasing, removing rust
B Leak Check
See Operating Instructions
20080/0 E 98-04
Note:
The cooling system must always be degreased before
decalcifying even if there is no visible oil fouling.
After rinsing for a second time during degreasing, fill the
cooling system with a 10% solution (100g/l) of water
and citric, tartaric or oxalic acid (available through
regular chemical-trade outlets), whereby preference
should be given to citric acid.
Run the engine at medium speed up to a temperature
of approx. 80 °C and retain this temperature for approx.
10 minutes.
Switch off the engine and allow to cool to approx. 50 °C.
Drain decalcifying solution completely
Rinse the cooling system at least 3 times with fresh
water and run the engine each time for approx.
5 minutes.
Install coolant thermostat (20-2470).
Fill cooling system with prescribed coolant and check
for leaks.
Note:
For decalcifying and removing rust, commercially
available products containing the above-named acids
can be used.
For environmental reasons, chromic acid or other
products containing chromium cannot be used.
Task Description