Automotive Technology: Principles, Diagnosis, And Service (6th Edition) (halderman Automotive Series)
6th Edition
ISBN: 9780135257272
Author: James D. Halderman
Publisher: PEARSON
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Textbook Question
Chapter 27, Problem 1RQ
How can a thermostat fail?
Expert Solution & Answer
To determine
Explain how a thermostat can fail.
Explanation of Solution
A thermostat can fail in the following four ways.
- Stuck open.
- Stuck closed.
- Stuck partially open.
- Skewed.
Stuck open:
A thermostat can fail when open or partially open because the normal temperature of the engine will be higher than the operating temperature.
Stuck closed:
The thermostat can fail when closed or almost closed because the engine will start to overheat.
Stuck partially open:
The thermostat can fail when partially open because the engine will start to warm up gradually indicating that the coolant temperature of the engine will not attain the desired temperature.
Skewed:
The thermostat can fail when skewed because the engine could overheat or function cooler than regular, or even perform both.
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motor supplies 200 kW at 6 Hz to flange A of the shaft shown in Figure. Gear B transfers 125 W of power to operating machinery in the factory, and the remaining power in the shaft is mansferred by gear D. Shafts (1) and (2) are solid aluminum (G = 28 GPa) shafts that have the same diameter and an allowable shear stress of t= 40 MPa. Shaft (3) is a solid steel (G = 80 GPa) shaft with an allowable shear stress of t = 55 MPa. Determine:
a) the minimum permissible diameter for aluminum shafts (1) and (2)
b) the minimum permissible diameter for steel shaft (3).
c) the rotation angle of gear D with respect to flange A if the shafts have the minimum permissible diameters as determined in (a) and (b).
Chapter 27 Solutions
Automotive Technology: Principles, Diagnosis, And Service (6th Edition) (halderman Automotive Series)
Ch. 27 - How can a thermostat fail?Ch. 27 - How can a water pump fail, requiring replacement?Ch. 27 - Prob. 3RQCh. 27 - Why must timing belts be replaced?Ch. 27 - Why is it important that the READY light be out on...Ch. 27 - Prob. 1CQCh. 27 - Coolant drained from the cooling system when...Ch. 27 - A water pump can fail to provide the proper amount...Ch. 27 - A defective thermostat can cause the powertrain...Ch. 27 - Intake manifold gaskets on a V-type engine can...
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