PS Magazine Issue 224 1971 Series [224 ed.]

Table of contents :
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Citation preview

FIREPOWE~142~~~a~lors

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37·49 COMMUNICA3~1 ONS AN/ARC44 Gm,"' ""P 37 Shoo'

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GROUND MOBILITY 2-19 Vacuum Gage 2·7 Tracked Carrier Tank & Pump Unit 8-12 Engine PM 13 Filfehfa~f:ment Semitrailer Poop 14 Rear View Mirror Truck Taitglte 15 Horn BultonLube 2Y.j·Ton Tr!I; Winch 15 Turn Signal Cover ~Hon ~eJ:l~c't~o~;aces ~: MIOIAI Trailer

FIREPOWER 20-27 MI07 2G-21 MI4 Extractors M3 / M3Al Sub MG22·23 MlSAI Look-AlihBolls 24 XM454 Info M203 tauflCher 2&·27

COMMUNICATIONS 37-49 MT·I029 Ground Strap 31 AN/ARC44

l~;~i~S-4~lms APII·5 Helmet

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:: R·508 Receiver 49

AIR MOBILITY 50-61 Pilot Checklist 50-61 Nylon Mesh Seat

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SUPPLY

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Us. ,I fet ,"ntlnl .1 tills publica· tI,. bs btu appro.,.' " D.parllllut ,I tilt ArIllJ, 22 January 1971. Hnd~uarttrs.

DISTRIBUTION: In accordance with re· qulrements submiHed on DA Form 12-4.

~~

IN THE HANDS OF A GOOD MECHANIC A VACUUM GAGE. IS LIKE A CRYSTAL BAll ... ESPECIALLy"

WHEN SEARCHING OUT CAUSES OF EXHAUST AIR POLLUTANTS.

the cylinder. The exhaust valve is closed and the intake valve is open-this makes the intake manifold and the cylinder one single chamber. As [pe piston moves downward the area of the chamAnd as it gets bigger. it wants to suck Why the vacuum gage? The reason. is that the vacuum in a in an equal volume of fuel and air mixgasoline engine must behave in a certain ture, but the small opening (venturi) way under certain conditions. Any mis- in the carburetor air h9rn won't let behavior is a clue to trouble-the vac- enough through; only a portion gets uum gage detects misbehavior. through. This reduces the pressure in What's vacuum gOt to do with a gas- the chamber to a point well below atoline engine? Where does it come from? mospheric pressure. Well, vacuum is formed on the down And there you have your vacuum stroke of each piston as it sucks fuel into condition.

the cylinder. The exnaust valve is closed and the intake valve is open - this makes the intake manifold and the cylinder one single chamber. As the piston moves downward the area of the cham-

gasoline engine must behave in a certain way under certain conditions. Any misbehavior is a clue to trouble-the vacuum gage detects misbehavior. What's vacuum got to do with a gasoline engine? Where does it come from? Well, vacuum is formed on the down stroke of each piston as it sucks fuel into

And as it gets bigger. it wants to suck in an equal volume of fuel and air mixture, but the small opening (venturi) in the carburetor air horn won't let enough through; only a portion gets through. This reduces the pressure in the chamber to a point well below atmospheric pressure. And there you have your vacuum condition.

uum. If the air comes through the normal path, that is, through the carburetor throat, everything's OK. But if it's sucked in through any other place, that's bad. Here's where your crystal ball-the vacuum gage-steps in. It'll point to the possible source of leaks and other trouble-which is a lot better than hunting high and low over the engine in a helter-skelter fashion. Your Internol (ombustlon Engine Gage (FSN 49( 0-255·8613) IS In Tool Sets No 1 (ammon - S( 4910 95-CL·AI4 No.2 (ammon - S( 4910·95-CL·A72 No 2 Supp)emenla(- S( 4940·95 CL A08

The natural and expected thing is for outside air to rush in and 611 the vacuum. If the air comes through the normal path, that is, through the carburetor throat, everything's OK. But if jt's sucked in through any other place, that's bad. Here's where your crystal ball-the vacuum gage-steps in. It'll point to the possible source of leaks and other trouble-which is a lot better than hunting high and low over the engine in a helter-skelter fashion.

Your Internal Combustion Engme Gage (fIN 4910 255·86731 IS m Tool Sets No 1 Common -IC 4910·95·(l·A74 No Hammon -IC 4910·95 C[·An No 2Iupp(emenla( -IC 4940 95 (l A08

BEFORE USING YOUR GAGE There are a couple of things you've got to do otherwise the gage readings won't be dependable.

fUEL PUMP TEST The gage will tell you how your fuel pump is behaving. To work right it must pump fuel at a given pressure-and your vehicle or equipment's .20TM tells what it should be.

To

test ...

1. Disconnect the fuel line at the

3. Start engine lit'li run on fuel left in the carburetor) or have it cTonked with the starter. 4. Now read the PSI on the gage's bottom scale. If it's within me PSI given for that piece of equipment, it's OK. But if it's below the specified PSI and if the fuel line isn't clogged, the pump needs changing. If you're testing an electric pump, make your hook.up where the equipment's .20 TM says.

A BREAK FOR THE TUNE-UP MAN

YAOIIM TI5T 1.

»your HlIide has and

0 combination YfXIIUII>-iIooster _ you'l1

fuel has.

10 ~isOll1ned ~lromtile_aoW.EiIher

plug tile Opening or aIIam tile y"",um gage at this point,

2. Mcke sure 011 the he~·nuts, monKoJd. nuts, SfMIm·p1"" and vacuum (OI1fIt(. liom ore light. Bullok. ~ easy ... don'l overtorque.

the gog" Be sure 10 us. tile rtght adopter. Conned either to the vacuum-booster pump connection or into the usual opening in the manifoldafter removing the pipe·plug. (onnel( K .y O~" • •C>lO": 'loll 1l.51l0.277.ESC.f.,b,ft••!,,,,,.. K.yc;.,ne,o!o •• rM ,1.U20-3;J:4· I5C, f!ib-,.• ·)92;!YI" Rod io$el. ,fM 11 - 5820.51' _201'. "'pr, lodio' S,,, "'N t", R( ' 51)C f-,N/ ... . C·SjBX.

.TM I1-SUo.UO·I2, fu.;1... N/0Il::, :: r06 Radlo. . ..

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