TM  10-3930-643-34 ENGINE,  FUEL,  EXHAUST  AND  COOLING  TROUBLESHOOTING  AND  MAINTENANCE.  (cont) 4-4. Cylinder Head Assembly with Valves. (Sheet 2 of 18) EQUIPMENT   CONDITION References Condition   Description TM  10-3930-643-20 Thermostat,  housing  and  by-pass  valve removed. Engine  water  temperature  sender removed. Engine  water  temperature  switch removed. Paragraph  4-6 Valve cover and rocker arm assembly removed. Paragraph  4-11 Manifolds  removed. Paragraph  4-12 Fuel injectors removed. Paragraph  4-15 Turbocharger  removed. Go to sheet 3 4-30