MK A School Flashcards
(51 cards)
*F / * C conversions
- F= (1.8 x *C) + 32
* C = 0.55 x (*F - 32)
Laws of heat flow
- flows from warmer to cooler substance
- must be a temperature difference for heat to flow, heat will continue to flow til temperatures equalize
- greater the temperature difference the faster the heat will flow
represents what when referring to crankshaft
Actual degree location relative to 0 degrees or TDC (top dead center)
What is air called that’s forced into a cylinder? And what are the ports through which it enters called?
Scavenge Air.
Scavenge ports
In many applications what does a turbo or blower assist in?
Intake process by providing positive pressure to the cylinder
What may be necessary when the are dirty vs when they are clean for torque wrench reading?
A higher torque wrench reading in order to reach required tension
What does excessively worn or scored piston skirts rings or cylinder liners indicate?
Abnormal maintenance or operating conditions and should be corrected to avoid a failure.
Jacking concerns
It is very hard on the the starting motor
Not an accurate way to position the crankshaft
Why barring is recommended prior to starting large Diesel engines
To prevent hydro-lock due to to possible accumulation of fluids in combustion chamber
When is crankshaft removal and when is it not needed
Removal is needed for replacement ONLY
Not needed for inspection
Removing all journal bearing caps will damage crankshaft why?
Due to bending or dropping of it.
Best engineering practice for caps
Mark caps to proper location for re-installation
How to prevent crankshaft damage when installing bearings and cap
Install in same location
When should crank web deflection readings only be taken with cutter?
In water
Where to record readings for Engines with crank journals of 4 inches or more?
Readings are to be recorded in machinery history + reported in cutter engineering report
When are web deflection readings normally taken?
When it is cold
Not all components are used on what types of engines?
Engines with overhead camshafts
What may be linked to the turbocharger?
Air cleaner and the air silencer
What will intake system have either/ or but not both?
An after cooler or an inter cooler
Who normally sets the pressure differential limits for changing elements?
By the manufacturer of the engine
Rotate cleaning devices only in what rotation?
In a clockwise rotation. Reversing can damage the element
What cylinder liner types are there?
Dry
Wet
Water-jacketed
Types of bearings?
Anti-friction
Roller type
Friction
4-stroke steps
Intake (suck)
Compression (squeeze)
Power (bang)
Exhaust (blow)
