ONAN
10
11
12
Matching: For items 5 through 8, match the cooling system component in column 1 to its function in column 2 |
Selections in column 2 may be used only once After the corresponding item number on the answer sheet, blacken the
appropriate circle |
Column 1 Column 2
Component Function
Water pump a Controls coolant flow
Radiator b Stores coolant and dissipates
Fan heat
Recovery System | c Circulates coolant through the cooling system
dad Prevents loss of coolant caused by expansion
e Draws air through the radiator
When the engine is cold, the coolant circulates within the
until the opens
a radiator, sending unit b radiator, pressure cap c engine block, thermostat ad engine block, pressure cap
On the M939 series vehicles, the controls the air
pressure to the fan drive clutch assembly
a hydraulic actuator c fan clutch solenoid
b air actuator dad bimetallic spring
On the HMMWV, the fan clutch solenoid opens a (an) which supplies hydraulic pressure to activate the fan a hydraulic control valve
b fan control switch c fan clutch solenoid ad bimetallic spring
The viscous clutch uses a (an) to control a gate valve that provides fluid to engage or disengage the
fan |
a hydraulic actuator c fan clutch solenoid
Trang 213 14 15 16 17 18
The device designed to energize the fan control valve ata predetermined temperature on the LVS is called a (an) a hydraulic actuator Cc b fan control switch da Matching: fan clutch solenoid bimetallic spring
For items 14 through 17, match the component in column 1 to its inspection procedure in column 2 Selections in column 2 may be used only once After the corresponding item number on the answer sheet, blacken the appropriate circle | Column 1 Cooling System Component Fan belts a Radiator Radiator hoses b Fan _ C da e Column 2 Inspection Procedure
Inspect for clogging, bent fins, leaks, and debris Inspect for proper
connections, bare wires, and leaks
Inspect for proper tension, tears, or glazed surfaces Inspect for cracks, bent blades, and missing or loose rivets or bolts
Inspect for firmness, cracks, swelling, and collapsing Which components require testing to determine their
Temperature sending unit, thermostat, surge tank serviceability?
a Surge tank, fan, and radiator cap b Radiator cap, shroud, and fan belts C
Trang 319 20 21 22 23 24 25 26
Matching: For items 19 through 22, match the component in column 1 to the test equipment that is used to determine its serviceability in column 2 Selections in column 2 may be used only once After the corresponding item number on the answer sheet, blacken the appropriate circle
Column 1 Column 2
Component Yest equipment
Thermostat a Tension gauge
Fan drive solenoid b STE/ICE or Multi-meter
Radiator cap c Radiator pressure tester
Fan belts ad Strobe light
e Thermometer
What kind of test is used to determine the serviceability of the thermostat?
a Resistance c Continuity
b Temperature ad Pressure
The fan drive solenoid on the HMMWV is tested by performing a test
a resistance c continuity
b temperature dad pressure
What kind of test is performed to isolate a problem with the fan control valve on the HMMWV?
a resistance c continuity
b temperature ad pressure
What safety procedure must be taken before removing a radiator cap?
a Open all drain cocks
b Run cold water over the radiator
Trang 427
28
29
30
What is the possible harmful effect of not correctly depressurizing the cooling system?
a The sudden change in pressure will damage the radiator b The vacuum created will prevent proper draining
c The sudden release of pressure may cause coolant to boil over resulting in severe burns
ad The pressure will crack the engine block
Listed below, in scrambled order, are the steps required to safely depressurize the cooling system
(1) Slowly turn the radiator cap counterclockwise to the first stop
(2) After the pressure has escaped, remove the cap (3) Allow the pressure to slowly release
(4) Cover the radiator cap with a heavy rag
Identify the proper sequence in which the steps above should be performed
,1 b 4,1,3,2
„2 d 1,3,2,1
Listed below, in scrambled order, are the steps for flushing the cooling system after it has been depressurized
(1) Start the engine and run it at fast idle
(2) Flood the cooling system (3) Open all draincocks
(4) Add clean water through the radiator filler neck (5) Continue flooding until clear water runs from all
drains
(6) Place all heater controls on hot or high position
Identify the proper sequence in which the above steps should be performed
What action should be taken if normal flushing doesn't properly clean the cooling system?
Trang 531
32
What are the three purposes of antifreeze?
a Protect from freezing, increase boiling point, protect against corrosion b Protect from freezing, decrease boiling point, protect against corrosion c Protect from freezing, decrease boiling point, lubricate water pump |
dad Protect from freezing, increase boiling point, pressurize the cooling system
Using the ethylene glycol antifreeze protection chart below, compute the number of pints of antifreeze required to
provide a protection level of -30°F for a cooling system with a capacity of 11 3/4 gallons a 42 b 38 Cc 56 äd 47 Ethylene Glycol Antifreeze Protection Chart Protection Level Pints of Antifreeze per Gallon of Solution +10°F 2 -0°F 2 3/4 -20°F 3 1/2 -30°F 4 -50°F 4 1/2 33 34 What two types of antifreeze are authorized for use in motor transport equipment?
a Ethylene glycol and alcohol b Ethylene glycol and arctic c Ethylene glycol and permanent
dad Ethylene glycol and general purpose
Trang 635 36 37 38 39 40
What level of ethylene glycol antifreeze protection is illustrated in the chart? a +20°F c +10°F b +25°F d +15°F BATTERY — +21) +32 ———— +32 °F ETHYLENE | PROPYLENE GLYCOL | GLYCOL METHOXY PROPANOL ANTIFREEZE PROTECTION
What are the four functions of lubricants?
a Reduce friction, pressurize, clean, and cool b Clean, cool, pressurize, and seal
c Cool, reduce friction, clean, and seal
ad Reduce heat, reduce friction, seal, and pressurize Matching: For items 37 through 39, match the climatic
condition in column 1 to the appropriate lubricant viscosity or viscosity rating in column 2 Selections in column 2 may be used only once After the corresponding item number on the answer sheet, blacken the appropriate circle
Column 1 Column 2
Climatic condition Viscosity\viscosity rating
Desert | a high viscosity
Winter b 10W4O
Both desert and winter c Low viscosity
da GO 90
Grease Automotive Artillery (GAA) is suitable for use where temperatures range between
a O°F and 180°F b -54°F and 180°F
Trang 741 42 43 44 45 46 47 48 49 50 Grease General Purpose (GGP) can used in which temperature range (s) ? a O°F to 177°F b all Cc 32°F to 110°F d below +32°F
The chemical make-up of GAA and GGP prevent these two lubricants from being used
a in desert climates b together
c in wet climates dad in cold climates
Matching: For items 43 through 46, match each component in column 1 to its primary lubrication system listed in column 2 Selections in column 2 may be used more than once After the corresponding item number on the answer sheet, blacken the appropriate circle
Column 1 Column 2
Component Primary lubrication method
Engine a Dip feed
Automatic transmission b Full-force feed
Manual transmission c Gravity feed
Transfer case dad Splash feed e Splash/dip feed
Matching: For items 47 through 50, match each component listed in column 1 to its function in column 2 Selections in column 2 may be used only once After the corresponding item number on the answer sheet, blacken the appropriate circle
Column 1 Column 2
Component Component function
Oil pump a Delivers the lubricant under
Oil pressure relief pressure
valve b Provides accurate reading of
Oil filter oil pressure
Oil sending unit c Removes small particles from
and gauge | the oil
ad Limits maximum oil pressure e Provides a passage for the
Trang 8Refer to the following situation and the lubrication order on page R-10 to answer items 51 through 59 Read the situation
carefully, then answer the items |
Situation: Your shop chief has directed you to drain and replace the lubricants in the LVS as required The
lubricants are now in accordance with the lubrication order for the below O°F range The expected temperature will be
above 32°F
Matching: For items 51 through 54, match each component listed in column 1 to its recommended lubricant in column 2 Selections in column 2 may be used more than once After the corresponding item number on the answer sheet, blacken the appropriate circle | Column 1 Column 2 Component Recommended lubricant 51 Engine a OE/HDO10
52 Transfer case b OE/HDO30
53 Axle shift unit c OE/HDO5O
54 Axle No 3 dad GO 80W90 —
e GO 85W140
55 What is the oil capacity of the nose box?
a 13 quarts b 7 pints
c 40 pints ad 33 pints
Trang 9KEY EXPECTED TEMPERATURES LUBRICANTS CAPACITIES | Above 32°F 50° to O°F O° to -50°F INTERVALS (Above 0°C) | (0° to -18°C} | (-18* to -46°C) Lubricating Ou | | | Engine ~ Engine 24 Qt OE/HDO30 | OE/HDO30 OEA OC-On Condition OE/HDO (22.7 Lì
_ tMIL-L-2104) W Filter -D-Daily (Operator)
o Transmission 36 Qt OE:HDO10 OE/HDO 10 OEA OEA l W-Weekly (MIL-L~46167) 96-30 ‘Fil WiFilter M-Monthly Transfer Case 10 Qt OE:HDO5O OE/HDOSO OEA 19.5 L) Q-Quarterly Months Hydraulic Reservoir 95 Qt OE:HDO30 OE:HDO 10 OEA (3 Months) (90 L) S-Semiannuan W'FiNer -Semiannually (6 Months)
Heavy Duty Winch 13 Qt OE:HDO50 | OE'HDO5O OEA
Gear Case (12.3) A-Annually Axle Shift Unit Fill 10 plug OE/HDO10 OE/HDO10 OEA
B-Biennially
opening
(2 Years)
Exposed Wire Rope OE/HDO10 OE'HDO 1Ô OEA
Oil Can Points _OE/HDO10 | OE/HDO10 OEA
Anti-Freeze _ Radiator 27 Gal AFC AFC 2- 2,000 Miles
Coolant AFC (102.6 L) Ethylene Glycol Ethylene
(MIL-A-46 153) Glycol 3- 3,000 Miles
Arctic
(MIL-A-117§5) 6- 6,000 Miles Lubricating Oil, Exposed Wire Rope CW CW
Chain Wire iVV-L-751) | (VV-L-751) 12-12,000 Miles Rope Gear Oil Above 10°F | 30°to-15°F | -15* to -50°Ƒ - ° -49 fe ° ° e GO (Above-12°C) |(-1° TO -26°C) | {-26° TO -46°C) 1 Hour MIL-+L-210 5Ì Axles No 1, 2, and 4 33 Prt GO 85W140 | G60 80W90 GO 75W 5- 5 Hours (15.6 LỊ 10- 10 Hours les No.3 1 25- 25 Hours
Trang 1060 61 62 63 64 65 66 67 68
What are the three major sources of oil contamination? a Improper storage, improper handling, blown head gasket b Improper storage, dirty containers, improper handling c Component contamination, improper storage, improper
handling |
d Component contamination, dirty containers, improper handling
PFC Jones says the best way to keep dirt and water out of stored oil drums is to keep them sealed when not in use LCpl Green says that dirty tools are a major contributor to dirt and water contamination of oil Who is correct?
a PFC Jones b LCpl Green
c Both Jones and Green d Neither Jones nor Green Matching: For items 61 through 65, match the cause of
contamination listed in column 1 to the type of contamination in column 2 Selections in column 2 may be used more than once After the corresponding item number on the answer sheet, blacken the appropriate circle
Column 1 | Column 2
Cause of Contamination Type of Contamination Defective air cleaner a Fuel in oil
Worn piston rings b Water in oil
Leaking fuel injector c Dirt in oil
Blown head gasket Cracked block
What three benefits are achieved from using the Joint Oil Analysis Program as a part of your preventive maintenance program?
a Reduced downtime, reduced maintenance costs, and
increased unit readiness |
b Saving oil, reduced downtime, and reduced maintenance costs
c Reduced scheduling requirements, saving 011, and reduced maintenance costs
ad Establishing oil use records, reduced maintenance costs, and increased unit readiness
What publication provides a list of equipment and components_ that require oil sampling? >
a TM 4700.15/_ _ b TM 9-800
ec TI 4783-12/1 d TI 4731-14/1
Trang 1169 What are the two methods used to obtain oil samples? a Drain pan and sampling valve
b Sampling valve and sampling pump | c Siphon and sampling pump
d Drain pan and sampling pump
70 Leakage of enough fluid to form drops that fall from the item being checked or inspected is considered a class
leak
a I b TT
c III | a IV
Item 71 refers to the following situation Read the situation carefully, then answer the item |
Situation: You are an organizational mechanic working in the motor pool An operator has just told you that he has found a leak at the rear of the engine on his vehicle
71 As an organizational mechanic, what action are you required to take?
a Deadline the vehicle |
b Verify the classification of the leak and determine if the equipment can be operated safely
c Instruct the operator to continue operating the equipment until the next PM
ad Restrict the vehicle to local runs only
72 What parts or areas are the most likely to leak ona vehicle?
a Water pump, gaskets, oil coolers, hose connections, plugs/fittings, and seals
b Fuel tanks, oil coolers, hose connections, plugs/fittings, and gaskets
C Hose connections, plugs/fittings, gaskets, and seals d Water pump, gaskets, fittings, and seals
73 What one item of test equipment can be used to conduct both electrical and oil pressure tests on the lubrication system? a Multi-meter b Flow meter
Cc VAT 40 da STE/ICE
74 What publication provides instruction for testing and repairing the lubrication system at the organizational level?
a TM -20 series b TM -34 series
Cc TM -20P qd TT 4731-14/1
Trang 1275 76 77 78 79 80 81
What fault could easily cause enough excessive pressure to build up within a transmission to make gaskets and seals start leaking?
a Damaged "0" ring _b Plugged oil filter
c Plugged breather valve @ Damaged oil pump
How do you test the operation of the oil pump on the transfer case of the LVS?
a Conduct a filter pressure test b Check for pump back pressure
c Remove one of the oil feed lines and check for oil flow ad Check the pump windings for continuity
Testing the pump on the number 1 axle assembly of the LVS is performed by watching oil flow from the feed line that you must disconnect from the
a axle shift unit b lockout chamber
c sliding clutch cover d differential carrier cover What is done just before actually draining lubricant from a major component?
a Operate the vehicle at high idle for 30 minutes before draining
b Operate the vehicle for a short period of time c Remove the oil pick-up screen
ad Remove all breather valves
What is used to clean metal parts such as wheel bearings?
a Brake fluid c Soap and water
b Diesel fuel ad Non-petroleum based solvent
What is used to clean rubber parts such as seals and "oO" rings?
a Petroleum-based solvent b Soap and water
c brake fluid
Before installing a drain plug that has a copper gasket, you should replace the gasket What should be done to a plug that is not equipped with a gasket?
a Install a lock washer
b Coat the threads with pipe sealer
c Replace the plug Don't worry about the gasket ad Throw it away; drain plugs are always replaced
Trang 1382 83 84 85 What is the procedure for installing a spin-on type oil filter?
a Apply a light coat of grease to the seal Tighten the filter by hand as tight as possible, and then, using a crescent wrench, tighten an additional turn
b Apply a light coat of oil to the gasket (seal); tighten | the filter by hand, and then tighten an additional 2/3
turn with a strap wrench
c Clean the grease and oil from the seal and tighten the filter by hand
ad Apply a light coat of oil to the seal, screw the filter onto the adapter until resistance is felt, and then tighten an additional turn
What is the proper procedure for lubricating universal joints?
a Apply grease until all the old grease is pushed out of the cap seals
b Apply four full pumps of the hand grease gun to each
joint |
c Spray the universal joint seals with WD40; most joints have sealed bearings and cannot be lubricated
dad Apply just enough grease to grease the joint; usually one or to pumps of a hand grease gun
Listed below, in scrambled order, are the steps for
servicing wheel bearings (1) Repack (2) Clean (3) Replace (4) Inspect Identify the proper sequence in which the above steps should be listed ;2,1,3 b 1 ,4,1,3 2
What action do you take if you don't know a specific procedure for handling or disposing of oils, greases, solvents, or antifreeze?
a Notify the unit's hazardous waste handler dad Notify your direct support maintenance unit b Contact the nearest environmental agency c Contact the nearest JOAP activity
Trang 14Items 86 through 88 refer to the following situation Read the Situation carefully, then answer the items
86
87
88
Situation: A five ton truck (M923) required corrective maintenance during a field exercise due to a leaking engine oil pan gasket The truck was brought into the maintenance area where the oil pan was removed and cleaned using ary | cleaning solvent and rags The pan was then replaced along with a new gasket
Which procedure must be used to dispose of the used oil
and the cleaning solvent that was used to clean the oil pan? a b d Dispose of the solvent and the oil in the oil collection point
Dispose of the oil at the oil collection point and
dispose of the solvent by diluting it with equal amounts of water and dumping it 50 feet away from the
maintenance area
Dispose of the oil in the oil collection point and the solvent in the separate container marked "solvent."
Dispose of both the oil and the solvent in the hazardous waste container
Which procedure must be used to dispose ot the old oil filter?
a Put it in the scrap metal bin
b Place it in a plastic bag and dispose of it in the solid waste container
c Place it in a plastic bag and dispose of it in the liquid waste container
d Put it in a separate container and dispose of it as hazardous waste
Which procedure must be used to dispose of the solvent- soaked rags used to clean the oil pan?
Dispose of them in the used rag bin
Keep them separate from the other used rags and dispose of them as hazardous waste
Dry them and use them again
Bury them 50 feet from the maintenance area
Trang 15_Ttems 89 through 91 involve environmental violations relating to the figure on page 17 Notice that the figure is divided into three sections labeled A through C Make sure that you refer to the appropriate section when answering the items Review the figure carefully, then answer items 89 through 91
89
90
91
Which practice shown in section "A" is a violation? a Mixing oils in the same drum
b Drums not stored on an oil rack
c Failure to keep POL area clean and orderly ad Drums stored outside
Which practice shown in section "B" is a violation? a Vehicle hood in raised position while on rack b Oil drums loaded in back of vehicle
c Coolant being drained into the stre’m
Which practice shown in section "C" is a violation? a Drums stored too close together
b Antifreeze stored with oil c Drums stored outside
ad Leaking drums