MTU Detroit Diesel 183 Series Technical Publication page 550

Group 20
Subgroup 2470
Page 2
20080/1 E 98-12
Check
Secure thermostat on a wire in a container filled with
water; thermostat 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.
Note:
Never use a welding torch or soldering lamp to heat the
coolant thermostat.
Part is hot. Risk of injury!
Handle part only when wearing gloves.
Stir coolant to achieve uniform temperature and check
thermostat start of opening.
If result is negative, replace coolant thermostat.
Continue to heat coolant to full-opening temperature.
Full-opening temperature = 94 °C
Thermostat insert must be completely open after
approx. 6 to 8 minutes.
Measure coolant thermostat stroke travel.
Travel must be at least 8.0 mm; otherwise replace
coolant thermostat.
Installation
Check sealing and mating faces.
Grease new O-rings with petroleum jelly and insert in
housing cover.
Insert coolant thermostat, with vent notches (arrows)
facing upwards, into crankcase.
Install housing cover with hex screws.
Task Description
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