TB 48 - Jake Brake Flashcards
(20 cards)
What are the advantages of the jake brake?
Increased performance
Safety
Versatility
Cost-effectiveness
Diesel engines have substantially less retarding effect than what engines?
Gasoline
The retarding effect on Diesel engines is less than gas engines due to lack of restriction in what due to butterfly in carburetor creating a vacuum?
Intake manifold
The jake brake is what type of attachment to the engine which alters the engine exhaust valve operation?
Hydraulic
The jake brake converts the Diesel engine into what?
An air compressor
The retarding of the engine by use of jake brake is accomplished by prematurely opening what valves near the top of the compression stroke releasing the compression to exhaust?
Exhaust valves
The jake brake may be used for what?
Descending grades
In city traffic
Approaching stop lights
Whenever retarding required
What will continually absorb and dissipate the heat generated by the jake brakes continual use?
Engines cooling system
The jake brake will activate and deactivate in less than what of a second?
1/4
As far as temperature, the engine should be fairly what before engaging the jake brake?
Warm
What attachment to the engine is sufficient to keep the engine warm?
Preheat water temperature
What are the 3 positions of the jake brake (1-3 position switch)?
Minimum - 1
Moderate - 2
Maximum - 3
When the jake brake switch are used on Detroit engines with automatic transmission, the single 3 position switch will have what positions?
Off
Low
High
Use of the jake brake on the freeway or similar open road should be dictated by traffic conditions and who’s good judgement?
Operator
When driving through light traffic conditions, which setting of the jake brake should be applied?
Minimum
When driving through medium traffic conditions, which setting of the jake brake should be applied?
Minimum to moderate
When driving through heavy traffic conditions or emergency responses, which jake brake setting should be applied?
Maximum
You should not engage the jake brake when streets are what because the additional braking effort on the drive wheels can cause them to lock up and into an uncontrollable skid?
Wet streets
Possible engine and component damage and engine stalling when jake brake is engaged during what operations, you should not engage during these operations?
Pumping or aerial operations
The jake brake is automatically deactivates with an automatic transmission at what RPM above idle? (Old not in TB)
150 RPM
