MTU Detroit Diesel 183 Series Technical Publication page 556

Group 20
Subgroup 2470b
Page 2
20080/1 E 98-12
Removal
Remove hex screws and remove thermostat housing.
Remove thermostat elements from coolant distributor
housing.
Remove O-rings from coolant distributor housing.
Check
Secure thermostat insert on a wire in a container filled
with water; thermostat insert must not contact
container.
Heat water with suitable heat source.
At approx. 8 °C below opening temperature (depending
on design), the heating speed must not exceed 1-2 °C
per minute.
Start-of-opening temperature is stamped on thermostat
insert.
Note:
Never use a welding torch or soldering lamp to heat the
coolant thermostat element.
Part is hot. Risk of injury!
Handle part only when wearing gloves.
Stir coolant to achieve uniform temperature and check
thermostat element start of opening.
Replace thermostat insert if results of check are
negative.
Task Description
Notice!