MK A School Flashcards
*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)
2-stroke steps
Intake
[compression , power]
Exhaust
Scavenging
Intake and exhaust done by blower
Prevents air or fluid from entering/exiting pump stationary seat, rotary seal, spring
Inspect with gloves
CLEAN before installing
Mechanical seal
Water flinger use, process, type
If water leaks by seal it prevents stuffing box water from entering bearing housing
Spins, shoots it out
Is rubber grommet or gasket goes inside pump
Sits inside pump casing
Push all the way in
Held in pump by rubber cap or “seal seat”
Stationary seat
Attaches to shaft. Seals up. It rotates. Make sure to inspect them
Rotary seal
What is the bore?
ICE
The DIAMETER of the engine’s cylinder
Definition of stroke?
ICE
DISTANCE piston travels from [TDC to BDC] top of cylinder to the bottom
How is power rated?
ICE
In units of Horsepower
What is indicated horsepower?
Power transmitted to the pistons by the gas in the cylinders & is mathematically calculated
What is Brake horsepower?
Amount of usable power delivered by the engine to crankshaft
Definition of torque
Measure of engine’s ability to apply the power it is generating
Compression stroke?
Where engine compresses cylinder full of air into much smaller volume before fuel injected and combustion occurs
What is the portable de watering pump is primarily designed for what?
De watering
What GPM and at what foot suction lift is P-6 capable of?
Delivering over 250 gpm at 12 foot suction lift
Complete dewatering kit weight?
Less than 120 lb
Contents inside p-6 pump can
- P-6 portable dewatering pump
- Removable portable fuel tank (2.5 gal) (4-6 hours of operation)
- 15 ft long, 3 in. Diameter suction hose w/quick disconnect fitting (black)
- 20 ft long 3 in. Diameter fiber reinforced discharge hose w/quick disconnect fitting (blue)
- spare pull rope for starting engine w/o recoil starter
- flashlight
- laminated instruction card in 4 languages
- an operation and maintenance manual
P-6 fuel tank gallon amount, type of fuel, and typical running time
2.5 gallons
Unleaded fuel
4-6 hours
Throttle opening position when first starting p-6 pump?
Position at 1/3
What to do with choke once p-6 pump starts
Shut off
Limit you can operate p-6 pump w/o water
don’t operate for more than 2 minutes
What to do when pump is running but no water flow
Operate hand primer until water is flowing from the discharge hose
How long to flush P-6 with fresh water when shutting down pump
Approximately 5 minutes
How often P-6 should be inspected/test run
Once a month
What does P-6 initial 20 hour maintenance entail
Replacing engine fuel filter
Replacing engine oil
Do not use P-6 where
Below decks or in confined spaces-due to CO poisoning
PPE required when operating the pump
Hearing protection
Class ; maximum safe voltage ; label color for CG approved insulating gloves
MK3 UNIT 3. Electrical & electronic
3-1-10
Class 0 = 1,000 volts = red label color
Class I = 7,500 volts = white label color
Class II = 17,500 volts = yellow label color
Class III = 26,500 volts = green label color
