ICE Flashcards
In a four stroke gas engine where is the fuel air mixed?
Carburetor
The amount of fuel injected by a fuel system is determined by adjusting What?
fuel rack
Min cetane for MTU and PAXMAN?
45
In a 2 stroke how do exhaust gasses exit the cylinder?
through the cylinder wall
Shaft taper %?
80%
Keel coolers use what?
ANTIfreeze
What size cutters are required to carry lube oil viscosity comparators?
All cutters and boats that use 9000 & 2104 series lubricating oil
What does consistent lifting of a cylinder relief valve indicate?
Weakened spring, early fuel injection, faulty fuel injector
How to treat small burrs on a piston pin?
Replace it. Under no circumstances are pins to be cleaned with sandpaper or emery cloth per NSTM 233.5.11
what ensures oil is dispensed on oil bearing walls
oiler rings
A thrust bearing supports what type of movement?
axial
Engine sampling Jacket water
Monthly?
When crank deflection readings all read +(plus) the crank is said to be?
Convex Upwards
What type of engine has a wet type oil sump?
4 stroke
If a full load is applied to an engine with new rings or liners what should happen?
too much load-galling pistons, scoring liners or piston seizure
To little- cylinder surface will glaze and wear, rings will cease
Pistons rings are subjected to extreme heat, dirt, & marginal lubrication as well as_____?
Pressure loading
How many compression strokes for on a 4 stroke engine?
4 strokes: Intake, compression, power, exhaust.
2 complete cycles/ revolutions
1 compression stoke
What methods are used for checking piston rings?
visual inspection and operational parameters
. 2 stroke how many revolutions
one
The cutters in the CG fleet are equipped with what to aid in the engaging and disengaging of the power from the engines to the red gears
Hydraulic multi disc and overrunning clutches
What are the two types of screw extractors?
straight flute and spiral taper
Type of cyl liner that doesn’t come in contact with jw?
Cast
After flushing an engine how long do you run the engine before your first viscosity test?
15 min
What does the MPU-23 card exhibit what color lights when operating normally
Green yellow yellow
Center section overhauls shall be done based on the ?
condition of the engine not solely based on engine hours
If cylinder liners are to be reused, they should be inspected for wear, cracks, and _____ at each overhaul?
Corrosion
What helps steady engine RPM’s after a sudden load change?
flywheel
Defective pistons and excessive carboning of rings would indicate a problem with what?
Vacuum system
What tool is used to measure journal bearings?
Micrometer Plastigauge
CHP for an engine overhaul is what chapter in the NSTM
NSTM ch 233 diesel engine
NALFLEET is ?
Used to prevent corrosion in engines with dissimilar metals
What is a rudder stock supported by?
a bearing
Stave bearing measurement how far do you go?
4-6 inches
A rule-of-thumb used for deflection is ______ inch for each inch of engine stroke other than the last throw on the flywheel end?
0.0001
in a diesel 4 stroke engine what is the term for the timeframe which both the exhaust and intake valves are open?
valve overlap
Cylinder liners wear at the greatest rate in an area ____ degrees to the crank and in the direction of the piston thrust?
90 deg
Crankcase explosions most likely caused by what?
cracked pistons
When is the cutter engineering report due?
No later than Jan 31 unless at sea then report at next port
When new rings are installed how should you measure the gap?
feeler gauge
Corrosion resulting from loads applied by mounting bolts, in-service conditions, or even mfg processes?
Stress corrosion
Pneumatic clutches
Eaton Airflex
What occurs between the end of the compression cycle and the beginning of the power cycle in a diesel?
Fuel Injection
how often are edge type disk strainers rotated
one complete revolution per hour
Torsion couplers
Geisler and bvulker Reto S
Flexible couplers
What causes oxidation in oil?
temperature rise
What factors must be observed to determine if piston rings are setting in?
Crank PSI, exhaust color, compression & fire psi, & lube oil consumption
In a propulsion plant the higher the gear ratio the ? the torque?
greater
What supports shafting inside the skin of the ship?
Line shaft bearings
What does the cage NOT do in roller bearings?
Help carry the load.
How can a 2 stroke diesel engine be identified?
Cylinder ports
How do you dress slight scoring on a crankshaft bearing surface?
oil stone
On ICU if a full load is applied to quickly to an engine having new liners installed there is a risk of what?
Galling pistons, scoring liners, or even piston seizure
Crankshaft question with a + sign for web deflection
Slowly turn crankshaft in the direction of rotation and stop when the crankshaft deflection is in the #2 position(inboards). Record any changes in pointer deflection as a + or -.. Closing of the web is a negative - value. Opening of the web is a positive value +.
What size journal is included in the cutter engineering report?
4 inches or greater
How many DEMP readings are required?
7
on a 225 what is the spark plug gap and L/O pressure
.28-.23 23 PSI for L/o
What chapter covers Jacket water?
233 NSTM Internal Combustion Engines
Corrosion with tiny pin holes?
Pitting
What tool is used to measure journals?
micrometer
What is the allowable deviation from round and smooth shaft journals
Slight circumferential grooving is acceptable
What do you do if the coolant nitrite level is below 100PPM
Add one gallon of NALCOOL for each 100 gal capacity
What is a governor controlling the flow of oil to or from the power cylinder assy?
pivot valve
How long may sea trials last to demonstrate proper operation of an overhauled engine?
4-6 hours
What type of material; do we use for an o-ring?
nitrile and Buna s
How far do you rotate the shaft when using plastigage?
Do not rotate the shaft
what are the two types of bearings used on engines
anti friction and friction
What do chunks of rubber from the shaft bearing mean?
overheating
how do filters flow
outside to inside (reusable type)
what ARE THE TWO TYPES OF PNEUMATIC CLUTCHES USED IN THE cg?
disc type and drum type
How often do you take readings on a newly rebuilt engine?
15 min
ODR readings and recorded data will be sent back to 87’s on what basis?
monthly
When do you use FOP brake?
in emergencies only
For the shaft rudder what is stick slip and how do you fix it?
Chattering or Squealing caused by the hydrodynamic water film not yet fully developed/ loosen staves
What type of coupling utilizes oil dampened steel springs?
Torsion damping couplings
Glass or plastic shaft cowling is inspected
every regularly scheduled dry dock
what corrosion inhibitor is used on most 87s
glysacorr G93
Corrosion that takes 6 months to surface?
Crevice
. what connects the cam follower to the valve?
rocker arm
What controls the engines fuel rack on a internal combustion engine?
the governor
Diesel engine reading shall be taken every ___ min during break in.
15 min
two inspections for a piston or cylinder]der liner?
visual inspection and operational parameters
What device applies air pressure to the intake of an operating diesel engine?
Blower
Who can perform calibration of diesel injectors
only qualified shops and facilities
how much power does a turbo add to a naturally aspirated engine
50%
How to clean a plate cooler?
Fiber brush, never steel or steel wool
After freshly filling or treating coolant when do you check it?
24 hours
Monthly
in accordance with planned maintenance
What causes low compression in the cylinders?
Poorly seated or worn rings
CG filters
2types- disposable and reusable
Chrome plated piston rings require ______ for successful seating in?
Higher cylinder PSI
What do you need to properly seat a piston ring?
high cylinder pressure
Suction strainer will usually be?
100 to 200 wire mesh
What type of R/W system has to be closed in order to clean?
Simplex strainer
What causes high oil consumption on a new engine?
Ring seat
When a contractor finds heavy corrosion in a jw system they should descale with what?
Hydrochloric Acid
What tools do you use to bearing shells?
Depth Micrometer
Upon completion of an overhaul, the supervisor will ensure the completion is documented in what two reporting systems?
Next cutter engineering report, and CM plus
What temp do you maintain an engine at during run-in to check bearings?
120 F
What is the proper pressure drop across each piston ring?
½ the pressure above each ring
JW sampling after treatment?
24 hours
What are the three methods of connecting a piston to a conn rod?
Fixed, semi floating, and floating
Chrome plated rings or liners require what for successful ring seating?
Higher cylinder pressures
Demps doesn’t read?
Intake Air temp
What are the advantages of sodium filled valves?
Provides a more rapid heat transfer
What are the two methods for cleaning the engine block and parts?
soaking and flushing
Soaking is when an engine is dipped in an alkaline solution
Flushing is hot clean oil flushed through entire system
What do you do is the oil cooler on a CAT engine fails
replace oil cooler
A drop in the exhaust temp and firing pressure only would indicate a problem with?
fuel system
What removes/controls the amount of oil film on cylinder
walls
wiper rings
Three basic purposes of piston rings?
Seal, heat transfer, lubricate
How many compression strokes for on a 2 stroke engine?
2 strokes: suction, and exhaust or power
1 complete cycle, 1 revolution
What are the two basic rudder bearings used on small boats?
Stave and smooth
What part of the governor positions the fuel rack of the engine?
servo motor
Crankshaft counterweights will vary depending on what?
number of cylinders
If chloride concentration exceeds 100 PPM
Dump the entire system
Crankshaft counterweights are always found in ?
pairs
