Propulsion Flashcards
Where do you measure plastiguage
Widest part
How many rotations of crankshaft for plastigauge to work
None
What is happening if you have a fine mist coming oil of your red gear
Mist eliminator is full
Main gear on a reduction gear is what type
Helical
Radial shaft bearing prevents what
Radial bearings support the shaft
Whipping of the bearing happens when?
Lack of oil, poor bearing contact, pinched bearing or insufficient clearance
How long must ship be in water before taking shaft readings?
2 days minimum
Cpp oil should be tested for water when?
Weekly
What happens to a new stern tube bearing at low speeds?
Gripping
Space of gear tooth of a red gear to the area in which it mates is called what?
Backlash
Most likely cause of a crankcase explosion with no indicators is what?
A cracked or blown piston
How is TIN measured in a spectrometeric oil analysis?
Ppm
What does SSS clutch stand for?
Synchro self shifting
what do you do about minor scratches or scores?
Grinding and lapping
What supports rudder shaft?
Bearings
What type of o-ring offers the very best in leakage control?
SAE flat face o-ring
What do you grease when replacing a lower unit on 225 outboard?
Shift rod, shaft splines, and water tube seal
Rudder stock is supported by what?
Bearings
On larger diesel engines improper main bearing bore alignment may be found using what?
A crankshaft deflection gauge or by indications of wear in the main bearings
What helps with instantaneous crankshaft load change?
Fly wheel
Best o-ring for petroleum
Nitrile of fluorocarbon rubber
How is a mechanical seal held in place?
Mechanical force
What is a gland when it pertains to a sealing device ?
A cavity of a stuffing box, which surrounds and supports the sealing device
What type of coolant is used for a keel cooler
Commercial anti-freeze
What is a rudder attached to on a cutter
Rudder post
Mist emitting from a reduction gear
Bad precipitator or mist eliminator
Demps stands for what and what are the readings?
Diesel engine maintenance programs
Cylinder compression pressure, cylinder firing pressure, cylinder exhaust pressure, crankcase vacuum, intake manifold pressure , and lube oil consumption
What do chrome plated cylinder liner and rings need to better brake-in/seat?
They require higher cylinder pressures for successful ring seating
Five sections of a turbine?
Compressor, combustion chamber, gas generator turbine, power/free turbine, and accesory drive
Reduction gear oil change intervals?
1000 hrs for oil, 500 hrs for oil breather, and 100 hrs for output flange seals
What is done by coating gear teeth with Prussian blue?
Spotting
Satisfactory tooth bearing is what percentage of working space?
80%
What temp is the hot oil flush on a newly overhauled engine?
175-190F
What vibration dampener is the best at all speeds?
Viscous type dampener
(Reduces stresses created throughout the whole speed range of the engine)
You see small rubber pieces coming out the shaft seal this is caused by what?
Overheating
Shaft bearings prevent what kind of play?
Side-side
What type of cylinder does not have coolant flowing around it?
Dry cylinders
At what point does the power stage start on a two stroke engine
After TDC
How many turns on a crankshaft to complete a whole cycle on a 2 stroke?
1
What is the main gear on ships shaft
Bull gear
What is done to valve seats to make sure they seat properly
Grinding/lapping
Most common contaminants piston rings face are dirt and ?
Water
If you have a high exhaust temp on one cylinder but the rest are normal what is your problem?
Bad injector
What type of filter lies between the pump and engine?
Full-flow
Cutters equipped with jacking gear should have it in what position when not in use?
Disengaged
All anti-friction bearings have what in common?
Rollers
What temp increase of jacket water across a CAT engine?
10-12 degrees
What position is the crankshaft in when you have a positive deflection reading?
Position 1
Your ship must be what before taking shaft readings?
Waterborne for 2 days minimum
What is the minimum crankshaft diameter required to perform web deflection?
4in
After oil and filter change how many hrs minimum before sampling?
25hrs
What happens when oil reacts with heat and air?
Oxidation
Sodium intake valves and exhaust valves help with what?
Heat dissipation
What is not a symptom of a failed bearing?
Oil leak
What is the max play in RBM reversing bucket bushing?
None MPC says to replace if any play is found
45 RBM how much oil in the bearing housing?
.48 gallons
