Troubleshoot and Repair a Propulsion Transmission Flashcards
(95 cards)
1
Q
Transmits power from the driving unit to the driven unit.
A
A MARINE PROPULSION UNIT
2
Q
Terms used to describe gear type mechanisms.
A
Speed Ratio and Gear Ratio
3
Q
_____ are determined by dividing the number of teeth on the driven gear by the number of teeth on the driving gear.
A
Ratios
4
Q
Force that causes a rotational movement of a object.
A
Torque
5
Q
The ____ of an engine supplies the rotation to the gears and shafts that transmit power to the driven unit.
A
crankshaft
6
Q
What increases and decreases torque?
A
GEARS, the higher the gears ratio, the greater the torque difference
7
Q
A drive mechanism that changes speed and torque and is common in marine engine installations.
A
INDIRECT DRIVE
8
Q
______ are commonly used where engines furnish power for auxiliaries.
A
DIRECT DRIVES
9
Q
MECHANICAL DRIVES affect the driven unit by:
A
- Reducing shaft speed
- Reversing the direction of shaft rotation
- Permitting quick-disconnect of the driving unit
10
Q
_____ operate most efficiently in a relatively low RPM range.
A
Propellers
11
Q
Designs for efficient diesel engines operate at a relatively _____ rpm range.
A
High rpm range
12
Q
In order to reduce speed of engine shaft to the propeller, many drive mechanisms consist of:
A
- REDUCTION GEAR
- REVERSE GEAR
- CLUTCH
- TRANSMISSION
13
Q
Allows both the engine and propeller to operate efficiently and used to obtain low propeller shaft speed with a high engine speed.
A
REDUCTION GEAR
14
Q
Most commonly used method for backing down power; accomplished by reversing the direction of the propeller shaft rotation.
A
REVERSE GEAR
15
Q
Used in mechanical drives to disconnect the engine from the propeller shaft.
A
CLUTCH
16
Q
Arrangement of the drive mechanism components.
A
TRANSMISSION
17
Q
The reduction gear consist of three major subassemblies:
A
- Forward clutch group
- Reverse clutch group
- Output shaft group
18
Q
- Externally mounted valve selector
- Five spur tooth gears and pinions
- 10 gpm oil pump
- Drive spider group
- Oil strainer
- Oil breather assembly
- Oil gauge
- Gear pan
- Instruction plate
A
Components found on a reduction gear
19
Q
Two gears with identical ratios mounted on the right or left hand side rotation engines with one gear forward and the other gear in reverse to obtain opposite rotation of propellers.
A
TWINNING
20
Q
The Twin Disc is completely hydraulic; all bearings are oil lubricated, both clutches rae engaged by high-pressure oil and both clutches are cooled and lubricated by low pressure oil. A mechanical lockup or _____ is provided for clutch engagement in the event emergency perations are necessary.
A
COME-HOME FEATURE
21
Q
The MANIFOLD is a multipurpose component that provides a mounting surface for:
A
- SELECTOR VALVE
- OIL PUMP
- TROLLING VALVE ASSEMBLIES
- PROTECTIVE COVER FOR CLUTCHES
- COME-HOME ACCESS PIPE PLUGS
- OIL RETURN PIPE ASSEMBLY
22
Q
The ____ group has a short, rigid shaft straddle-mounted on antifriction bearings.
A
OUTPUT SHAFT GROUP
23
Q
Connecting output member of the reduction gear.
A
OUTPUT FLANGE
24
Q
Two ____ are installed on the bearing retainer and seal around the flange hub.
A
OUTPUT FLANGE OIL SEALS
25
Spur-tooth gear that meshes with both the forward and reverse pinions.
OUTPUT SHAFT GEAR
26
The largest bearing in the reduction gear.
TAPERED ROLLER BEARING
27
* FORWARD PINION
* FORWARD PINION ROLLER BEARING
* CLUTCH SPIDER
* CLUTCH SPIDER BALL BEARING
* FORWARD CLUTCH SHAFT
* CLUTCH PLATES
* CLUTCH PISTON
* PISTON CARRIER
* HUB AND BACK PLATE
* REVERSE DRIVING GEAR ROLLER BEARING
* REVERSE DRIVING GEAR
Parts that make up the forward clutch assembly
28
Gear and sleeve that fits around the forward/reverse clutch shaft but doesn't make contact with the shaft.
FORWARD PINION
29
Internal gear teeth that mesh with the sintered-metal clutch plates.
CLUTCH SPIDER
30
Installed on the hub of the CLUTCH SPIDER.
CLUTCH SPIDER BALL BEARING
31
Input end is spline-connected to the spider. The reverse driving gear is keyed to a tapered area of the shaft is at this end.
FORWARD CLUTCH SHAFT
32
Mounted on the manifold end of the forward clutch shaft and held in position by the lock plate.
FORWARD CLUTCH SHAFT BALL BEARING
33
Seven steel clutch plates with internal gear teeth are the driving plates of the clutch.
CLUTCH PLATES
34
Mounted on the piston carrier and installed so the piston is in direct contact with the clutch plates.
CLUTCH PISTON
35
The stationary member of the clutch and installed ion the forward/reverse clutch shaft.
PISTON CARRIER
36
Keyed in position on a tapered area of the forward/reverse clutch shaft.
HUD AND BACK PLATE
37
Installed on the reverse driving gear for the FORWARD CLUTCH ASSEMBLY or the reverse driven gear for the REVERSE CLUTCH ASSEMBLY.
REVERSING DRIVING GEAR ROLLER BEARING
38
Keyed to a taper on the forward/reverse clutch shaft.
REVERSE DRIVING GEAR
39
* REVERSE PINION
* REVERSE PINION ROLLER BEARING
* CLUTCH SPIDER
* CLUTCH SPIDER BALL BEARING
* REVERSE CLUTCH SHAFT BALL BEARING
* CLUTCH PLATES
* CLUCTH PISTON
* PISTON CARRIER
* HUB AND BACK PLATE
* REVERSE DRIVEN GEAR
Parts that make up the REVERSE CLUTCH ASSEMBLY
40
Mounted on the manifold end of the REVERSE CLUTCH SHAFT and held in position by the shroud nut.
REVERSE CLUTCH SHAFT BALL BEARING
41
Input end is tapered and keyed to the reverse driven gear.
RESERVE CLUTCH SHAFT
42
* SELECTOR VALVE BODY
* SELECTOR VALVE STEM
* SELECTOR VALVE BALL BEARING
* O-RING SEAL
* SELECTOR VALVE LEVER
* PRESSURE REGULATOR PISTON
* PRESSURE RATE CONTROL PISTON
* PISTON SPRINGS
* ORIFICE PLATE
* STEEL BALL AND SPRING
* INDEXING DETENT
SELECTOR VALVE ASSEMBLY
43
High-quality casting that contains four drilled holes for installation on the manifold.
SELECTOR VALVE BODY
44
Designed with channels and ports that alignwith siimilar ones in the SELECTOR VALVE BODY.
SELECTOR VALVE STEM
45
Installed on the SELECTOR VALVE STEM.
SELECTOR VALVE STEM BALL BEARING
46
Installed on the SELECTOR VALVE STEM, between the SELECTOR VALVE STEM BALL BEARING and the SELECTOR VALVE STEM cover. The seal prevents leakage from the SELECTOR VALVE.
O-RING SEAL
47
It may be operated manually at the reduction gear location or from a remote location by the installation of linkage.
SELECTOR VALVE LEVER
48
* Largest hole - Entry port for pressurized oil to the pressure rate control piston.
* Meduim hole - Seat for the steel ball in the valve.
* Smallest hole - Orifice for metering pressurized oil to the piston.
THREE HOLES OF THE **_ORIFICE PLATE_**
49
Contains passages and ports for the transmission and direction of pressurized oil within the hydraulic system.
SELECTOR VALVE ASSEMBLY
50
Its function is to reduce the propeller rpm while permitting the high engine rpm require for operation of engine accessaries.
TROLLING VALVE ASSEMBLY
51
* Trolling valve body assembly
* Trolling valve stem
* Trolling valve piston and spring
* Trolling valve lever
* Oil seals
* Detent
TROLLING VALVE ASSEMBLY PARTS
52
A rotary gear type unit mounted on the manifold and driven by by splined drive sleeve on the reverse clutch shaft. The shaft rotates at all times at engine speed and anti-engine direction.
OIL PUMP ASSEMBLY
53
Maintains the oil in the sump of the reduction gear at the proper temperature.
HEAT EXCHANGER or MARINE GEAR COOLER
54
What happens if there is to little oil in the reduction gear?
Bearings run hot
55
What happens if there is to much oil in the reduction gear?
Excessive pressure causes leak at oil seals
56
What happens if oil is too cold in the Red Gear?
Results in insufficient oil flow
57
What happens if oil is too hot in the Red Gear?
Some lubricating capacity is lost.
58
Abnormal noises and vibrations must be \_\_\_\_\_.
investigated and corrected immediately
59
What engine oil is recommended to use in reduction gears?
SAE-API service class CD engine oil which is certified to pass TO-2 or C-3 test specifications
60
Another approved oil for reduction gears is \_\_\_\_\_.
CC engine oil and MIL-L2104B
61
DO NOT use ______ multiviscosity oils in twin disc transmissions.
10W-40 etc....
62
What must happen if there is too much oil in the sump?
Engines must be slowed or stopped until excess oil is removed and normal condition restored.
63
When should the reduction gear be overhauled?
At the same time the engine is overhauled
64
How often should you conduct an oil and strainer change on a reduction gear.
Every 1000 hrs
65
How often should you check the oil level of a reduction gear?
Daily with an oil gauge
66
How often should you remove OIL BREATHER ASSEMBLY and flush with clean diesel fuel?
Every 500 hrs and with oil changes
67
Maintenance of gears and bearings requires the lubricating oil to be clean and free of:
* WATER
* METAL
* DIRT
68
Under normal operating conditions, lubricating oil strainers perform satisfactorily. However, they cannot trap particles of metal and dirt that are fine enough to pass through the mesh. Once through the mesh, these particles may:
* Become imbedded in the bearing metal
* Cause wear on the bearings and journal
* Remove metal from teeth
69
What must happen at the first sign of emulsion?
Stop the plant and change the oil
70
The following is a list of periodic inspections that should be performed:
* Reduction gear mounting parts
* Heat exchanger connecting lines
* Rubber blocks
* Pressure gauge assembly
* Zinc electrodes
71
**_CAUSES OF LOW OIL PRESSURE_**
Partially clogged oil strainer
Remedy: Remove and clean oil strainer
72
**_CAUSES OF LOW OIL PRESSURE_**
Stuck pressure regulation piston in selector valve assembly
Remedy: Remove selector valve assembly, then disassemble the valve and clean the piston
73
**_CAUSES OF LOW OIL PRESSURE_**
Broken piston rings in clutches
Remedy: Remove the manifold and disassemble the clutch. Replace the broken piston
74
**_CAUSES OF LOW OIL PRESSURE_**
Come-home setscrew loose or missing
Remedy: Remove the come-home access pipe plugs and tighten loose setscrew by turning countwise or replace missing setscrew.
75
**_CAUSES OF LOW OIL PRESSURE_**
Damaged or worn oil pump.
Remedy: Replace damaged or worn oil pump assembly
76
**_CAUSES OF LOW OIL PRESSURE_**
Incorrect linkage installed on selector valve assembly
Remedy: Adjust the linkage so that the selector valve stem is indexed properly by detent
77
**_CAUSES OF LOW OIL PRESSURE_**
Clogged or plugged orifice in orifice plate of selector valve assembly.
Remedy: Remove the four hex screws that secure the orifice plate cover,plate cover gasket, the orifice plate and the orifice gasket to the selector valve body.
78
**_CAUSES OF NO OIL PRESSURE_**
Low oil level or empty sump.
Remedy: Check for leakage and repair, then refill with oil
79
**_CAUSES OF NO OIL PRESSURE_**
Fully clogged oil strainer.
Remove and clean oil strainer
80
**_CAUSES OF NO OIL PRESSURE_**
Damaged or worn oil pump assembly.
Remedy: Replace damaged or worn oil pump assembly
81
Steel ball in selector valve not seated properly
CAUSE OF HARSH ENGAGEMENT
82
**_CAUSES OF HIGH OIL PRESSURE_**
Stuck pressure regulation piston in selector valve assembly
Remedy: Remove slector valve assmbly , disassemble the valve and clean the psiton
83
**_CAUSES OF OVERHEATING_**
Insufficient heat exchanger capacity
Remedy: Install heat exchanger of sufficient capacity
84
* insufficient cooling water flow
* clutch slipping
* oil level too high
* improper oil in oil sump
* trolling at too high an engine speed
* clutch plates being warped
CAUSES OF OVERHEATING
85
* worn splines between reverse driving and driven gears and clutch shafts
* bearing failure
* worn or damaged rubber blocks
CAUSES OF EXCESSIVE NOISE
86
Clutch plates warped
CAUSE OF NO NUETRAL
87
The following are potential cause of propulsion gear failure:
* Poor teeth contact
* Inadequate lubrication
* Foreign objects
88
\_\_\_\_\_\_ can result from errors in parallelism between the mating gears which may be caused by an incorrectly supported gearcase or a failed bearing.
POOR TEETH CONTACT
89
Spotting gear teeth is done by coating the teeth with ______ and then jacking the gear in its ahead direction or rotation.
PRUSSIAN BLUE
90
A satisfactory ____ has been obtained when at least 80% of the axial length of the working surface of each tooth is contact, distributed over approximately 100% of the face width.
Tooth Bearing
91
INADEQUATE LUBRICATION is a common cause of scoring or wear and may result from the following conditions:
* Low lube oil pressure
* Restrcited or misdirected oil spray
* Water in the gearcase oil
92
First, a normal operating temperature should be established for a bearing by taking \_\_\_\_\_\_.
Periodic Readings
93
What is the best indicator of bearing health?
The running temperature of the bearing
94
* Bearing is running hotter or noisier than normal
* Evidence of bearing material in the L/O filter
* Necessary to investigate or correct poor tooth contact
* Refitting bearings cleanliness is essential
* Conducting a gear tooth mesh check
* Fitting a new bearing
Bearing inspections at other than scheduled intervals
95
These bearings must be completely removed for inspection.
SLEEVE BEARINGS
