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MK1 EOCT Propulsion Machinery > Troubleshoot and Repair a Propulsion Transmission > Flashcards

Troubleshoot and Repair a Propulsion Transmission Flashcards

1
Q

Transmits power from the driving unit to the driven unit.

A

A MARINE PROPULSION UNIT

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2
Q

Terms used to describe gear type mechanisms.

A

Speed Ratio and Gear Ratio

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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

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4
Q

Force that causes a rotational movement of a object.

A

Torque

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5
Q

The ____ of an engine supplies the rotation to the gears and shafts that transmit power to the driven unit.

A

crankshaft

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6
Q

What increases and decreases torque?

A

GEARS, the higher the gears ratio, the greater the torque difference

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7
Q

A drive mechanism that changes speed and torque and is common in marine engine installations.

A

INDIRECT DRIVE

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8
Q

______ are commonly used where engines furnish power for auxiliaries.

A

DIRECT DRIVES

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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
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10
Q

_____ operate most efficiently in a relatively low RPM range.

A

Propellers

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11
Q

Designs for efficient diesel engines operate at a relatively _____ rpm range.

A

High rpm range

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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
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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

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14
Q

Most commonly used method for backing down power; accomplished by reversing the direction of the propeller shaft rotation.

A

REVERSE GEAR

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15
Q

Used in mechanical drives to disconnect the engine from the propeller shaft.

A

CLUTCH

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16
Q

Arrangement of the drive mechanism components.

A

TRANSMISSION

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17
Q

The reduction gear consist of three major subassemblies:

A
  • Forward clutch group
  • Reverse clutch group
  • Output shaft group
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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

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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

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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

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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
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22
Q

The ____ group has a short, rigid shaft straddle-mounted on antifriction bearings.

A

OUTPUT SHAFT GROUP

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23
Q

Connecting output member of the reduction gear.

A

OUTPUT FLANGE

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24
Q

Two ____ are installed on the bearing retainer and seal around the flange hub.

A

OUTPUT FLANGE OIL SEALS

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25
Q

Spur-tooth gear that meshes with both the forward and reverse pinions.

A

OUTPUT SHAFT GEAR

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26
Q

The largest bearing in the reduction gear.

A

TAPERED ROLLER BEARING

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27
Q
  • 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
A

Parts that make up the forward clutch assembly

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28
Q

Gear and sleeve that fits around the forward/reverse clutch shaft but doesn’t make contact with the shaft.

A

FORWARD PINION

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29
Q

Internal gear teeth that mesh with the sintered-metal clutch plates.

A

CLUTCH SPIDER

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30
Q

Installed on the hub of the CLUTCH SPIDER.

A

CLUTCH SPIDER BALL BEARING

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31
Q

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.

A

FORWARD CLUTCH SHAFT

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32
Q

Mounted on the manifold end of the forward clutch shaft and held in position by the lock plate.

A

FORWARD CLUTCH SHAFT BALL BEARING

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33
Q

Seven steel clutch plates with internal gear teeth are the driving plates of the clutch.

A

CLUTCH PLATES

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34
Q

Mounted on the piston carrier and installed so the piston is in direct contact with the clutch plates.

A

CLUTCH PISTON

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35
Q

The stationary member of the clutch and installed ion the forward/reverse clutch shaft.

A

PISTON CARRIER

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36
Q

Keyed in position on a tapered area of the forward/reverse clutch shaft.

A

HUD AND BACK PLATE

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37
Q

Installed on the reverse driving gear for the FORWARD CLUTCH ASSEMBLY or the reverse driven gear for the REVERSE CLUTCH ASSEMBLY.

A

REVERSING DRIVING GEAR ROLLER BEARING

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38
Q

Keyed to a taper on the forward/reverse clutch shaft.

A

REVERSE DRIVING GEAR

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39
Q
  • 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
A

Parts that make up the REVERSE CLUTCH ASSEMBLY

40
Q

Mounted on the manifold end of the REVERSE CLUTCH SHAFT and held in position by the shroud nut.

A

REVERSE CLUTCH SHAFT BALL BEARING

41
Q

Input end is tapered and keyed to the reverse driven gear.

A

RESERVE CLUTCH SHAFT

42
Q
  • 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
A

SELECTOR VALVE ASSEMBLY

43
Q

High-quality casting that contains four drilled holes for installation on the manifold.

A

SELECTOR VALVE BODY

44
Q

Designed with channels and ports that alignwith siimilar ones in the SELECTOR VALVE BODY.

A

SELECTOR VALVE STEM

45
Q

Installed on the SELECTOR VALVE STEM.

A

SELECTOR VALVE STEM BALL BEARING

46
Q

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.

A

O-RING SEAL

47
Q

It may be operated manually at the reduction gear location or from a remote location by the installation of linkage.

A

SELECTOR VALVE LEVER

48
Q
  • 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.
A

THREE HOLES OF THE ORIFICE PLATE

49
Q

Contains passages and ports for the transmission and direction of pressurized oil within the hydraulic system.

A

SELECTOR VALVE ASSEMBLY

50
Q

Its function is to reduce the propeller rpm while permitting the high engine rpm require for operation of engine accessaries.

A

TROLLING VALVE ASSEMBLY

51
Q
  • Trolling valve body assembly
  • Trolling valve stem
  • Trolling valve piston and spring
  • Trolling valve lever
  • Oil seals
  • Detent
A

TROLLING VALVE ASSEMBLY PARTS

52
Q

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.

A

OIL PUMP ASSEMBLY

53
Q

Maintains the oil in the sump of the reduction gear at the proper temperature.

A

HEAT EXCHANGER or MARINE GEAR COOLER

54
Q

What happens if there is to little oil in the reduction gear?

A

Bearings run hot

55
Q

What happens if there is to much oil in the reduction gear?

A

Excessive pressure causes leak at oil seals

56
Q

What happens if oil is too cold in the Red Gear?

A

Results in insufficient oil flow

57
Q

What happens if oil is too hot in the Red Gear?

A

Some lubricating capacity is lost.

58
Q

Abnormal noises and vibrations must be _____.

A

investigated and corrected immediately

59
Q

What engine oil is recommended to use in reduction gears?

A

SAE-API service class CD engine oil which is certified to pass TO-2 or C-3 test specifications

60
Q

Another approved oil for reduction gears is _____.

A

CC engine oil and MIL-L2104B

61
Q

DO NOT use ______ multiviscosity oils in twin disc transmissions.

A

10W-40 etc….

62
Q

What must happen if there is too much oil in the sump?

A

Engines must be slowed or stopped until excess oil is removed and normal condition restored.

63
Q

When should the reduction gear be overhauled?

A

At the same time the engine is overhauled

64
Q

How often should you conduct an oil and strainer change on a reduction gear.

A

Every 1000 hrs

65
Q

How often should you check the oil level of a reduction gear?

A

Daily with an oil gauge

66
Q

How often should you remove OIL BREATHER ASSEMBLY and flush with clean diesel fuel?

A

Every 500 hrs and with oil changes

67
Q

Maintenance of gears and bearings requires the lubricating oil to be clean and free of:

A
  • WATER
  • METAL
  • DIRT
68
Q

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:

A
  • Become imbedded in the bearing metal
  • Cause wear on the bearings and journal
  • Remove metal from teeth
69
Q

What must happen at the first sign of emulsion?

A

Stop the plant and change the oil

70
Q

The following is a list of periodic inspections that should be performed:

A
  • Reduction gear mounting parts
  • Heat exchanger connecting lines
  • Rubber blocks
  • Pressure gauge assembly
  • Zinc electrodes
71
Q

CAUSES OF LOW OIL PRESSURE

Partially clogged oil strainer

A

Remedy: Remove and clean oil strainer

72
Q

CAUSES OF LOW OIL PRESSURE

Stuck pressure regulation piston in selector valve assembly

A

Remedy: Remove selector valve assembly, then disassemble the valve and clean the piston

73
Q

CAUSES OF LOW OIL PRESSURE

Broken piston rings in clutches

A

Remedy: Remove the manifold and disassemble the clutch. Replace the broken piston

74
Q

CAUSES OF LOW OIL PRESSURE

Come-home setscrew loose or missing

A

Remedy: Remove the come-home access pipe plugs and tighten loose setscrew by turning countwise or replace missing setscrew.

75
Q

CAUSES OF LOW OIL PRESSURE

Damaged or worn oil pump.

A

Remedy: Replace damaged or worn oil pump assembly

76
Q

CAUSES OF LOW OIL PRESSURE

Incorrect linkage installed on selector valve assembly

A

Remedy: Adjust the linkage so that the selector valve stem is indexed properly by detent

77
Q

CAUSES OF LOW OIL PRESSURE

Clogged or plugged orifice in orifice plate of selector valve assembly.

A

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
Q

CAUSES OF NO OIL PRESSURE

Low oil level or empty sump.

A

Remedy: Check for leakage and repair, then refill with oil

79
Q

CAUSES OF NO OIL PRESSURE

Fully clogged oil strainer.

A

Remove and clean oil strainer

80
Q

CAUSES OF NO OIL PRESSURE

Damaged or worn oil pump assembly.

A

Remedy: Replace damaged or worn oil pump assembly

81
Q

Steel ball in selector valve not seated properly

A

CAUSE OF HARSH ENGAGEMENT

82
Q

CAUSES OF HIGH OIL PRESSURE

Stuck pressure regulation piston in selector valve assembly

A

Remedy: Remove slector valve assmbly , disassemble the valve and clean the psiton

83
Q

CAUSES OF OVERHEATING

Insufficient heat exchanger capacity

A

Remedy: Install heat exchanger of sufficient capacity

84
Q
  • 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
A

CAUSES OF OVERHEATING

85
Q
  • worn splines between reverse driving and driven gears and clutch shafts
  • bearing failure
  • worn or damaged rubber blocks
A

CAUSES OF EXCESSIVE NOISE

86
Q

Clutch plates warped

A

CAUSE OF NO NUETRAL

87
Q

The following are potential cause of propulsion gear failure:

A
  • Poor teeth contact
  • Inadequate lubrication
  • Foreign objects
88
Q

______ can result from errors in parallelism between the mating gears which may be caused by an incorrectly supported gearcase or a failed bearing.

A

POOR TEETH CONTACT

89
Q

Spotting gear teeth is done by coating the teeth with ______ and then jacking the gear in its ahead direction or rotation.

A

PRUSSIAN BLUE

90
Q

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.

A

Tooth Bearing

91
Q

INADEQUATE LUBRICATION is a common cause of scoring or wear and may result from the following conditions:

A
  • Low lube oil pressure
  • Restrcited or misdirected oil spray
  • Water in the gearcase oil
92
Q

First, a normal operating temperature should be established for a bearing by taking ______.

A

Periodic Readings

93
Q

What is the best indicator of bearing health?

A

The running temperature of the bearing

94
Q
  • 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
A

Bearing inspections at other than scheduled intervals

95
Q

These bearings must be completely removed for inspection.

A

SLEEVE BEARINGS

MK1 EOCT Propulsion Machinery (3 decks)

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