PS Magazine Issue 005 October 1951 Volume 1 Number 5 [1, 5 ed.]

Citation preview

B-u-r-r-r-u-uther ... what a question. But don't go away so quick, son. Maybe it's closer to home than you think . It's like this-we 'UN's like to think we're downright superior to the enemy. Any enemy! That we have big advantages in mobility and firepower over mobs and fanaticism. We think our main strength is based on our ability to turn out more products than anybody else-fine vehicles, fine weapons, and fine aircraft. And we are so right. But this equipment has to be rollable, frreable, and Ayable to do us any good. Every truck, and gun, and airplane OT! the deadline iSla statisJic in the enemy's favor. As the Arabs say, with obvious reasoning, "An enemy of my enemy is a friend to me." And that also works the other way. 'What helps your enemy hurts you-is your enemy too. A dead lined truck, gun, or airplane is your enemy. It cuts down your mobility and your firepower. It cuts down your division the ,same as if tr",o ops were cut down by enemy action.

Do you know-that your Infantry Division needs all these things to do a thorough lob? Anyone Can plainly see that if you put half of 'em on dead· linel you've got only half a division. And anyone can plainly see that chopping divisions in half automatically makes the commies twice as strong. And I can see. Can't you? It tokes more thon just good production to make us stronger than any enemy - it also takes good

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OCTOBER 1951

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INFANTRY DIVISION 2 motorized road graders 2 electricol repair frucks ' 2 instrument repair trucks 2 machine shop trucks 2 artillery repair trucks 1 shop equipment truck I "five-passenger sedan 40 armored vehicles 38 ambulances 30' lruck traclors 18 6·lon cargo hucks 181ioison airplones 17 wrecker trucks 11 tonk recovery vehicles

Art.:; Timing _M46 Iqnition

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lotest M38 1/ 4·Ton News Briefing on 5-Yon 6x6's Caution on Plastic lenses New Info on 2"1 / 2·To"

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M34',

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EA·... ~ J1El Before Ope ration Services Joe Dope limerick Use Safety Chains Send Your ldea ~ to PS

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Editorial Combat Maintenance Hand Tool Clinic Connie Rodd Contributions 59t Half.Mas' Connie Rodd's Briefs

9 .4-lon (argo trucks

1,010 1/ 4-lon Irucks Ijeeps' 744 2-1 / 2-lon (O(go trucks 336 3/ 4-lon weapons carriers 140 medium ienks 75 1-1 / 1-lon dump lruck. 64 .onli·oimoftgun corriages 52 heavy trucks 9 lighllonk. 6 moforcyles 6 tractors with bulldozers 5 air compressor units 4 Signal Corps repair trucks 3 small orms repair trucks

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PS MAGAZINE is published monthly in · the interest of Preventive Maintenance for service-wide distribution all or:' ganixations as part of the PREVENTIVE

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MAINTENANCE PROGRAM.

PS Magazine is glad to get your ideas for articles and iilustrations, and is glad to answer your questions, Just write to: Editor, PS Magazine Aberdeen Proving Ground , Maryland DISTR IBUTION ; Tec h Svs IJl, except 9 11 0 1; Arm & Svc Bd Il l, AFf 131; 00; Maj Comd lSI, Bo se Comd (31; MDYt .4); A {5 1; CHO Ill; D ISO); B 131; It 131; 5 Bn Ill; Bn (5'; Sep C lSI; C 1121; FC 110'; Sch (25); PMS&T Il lt exce pt 9 ISO); Dep 1101; GH (51; SH (51: PE Ill; OSD lOrd Off' 121; An II 0), Deph,. Kk, 1101; Itcl Sia Ill; Di., En g (31; Dilt (31; Special di str ibution . . for nplanatio" of di.lribution formulo f •• Sl110·90·1 .

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Dear Sirs, In the Service Section of this M.M Co , 'Wc'ye becn able to get some items in plentiful supply but find jt impossible to gCt other parts. For instance we have been able to get GMC From Spring Bushings O.K. SO we ha\"c used thl:l11 for iCl'P bel!crank bear. ings b) cutting off I.," and drilling :ol grl:asl: holl:. For Dodge rC;I( springs the bushing works O.K. by cuning off V4" .Also we lISI: thl:ll1 (or the ric -rod bushings on the G,\IC's. \Ye nccdl·d a large size cone for center· ing a sl1('/I l";lsing on our lathe, so we found out that thl: t.lper cones for Barrcn Brakc Drum Luhe 1l1:l)' be used as conc for linc-celltcr on brhe by using ~dap[er bushings furnished with brake drum bthe_ Also we found rh :u the froll[ beuing of a GMC generator can be used CO replace the bearing on the armature of Generating Unit 17-9-1971·50 (S K \XI). 10 using our gasolinc driwn Onan Battery chargc n\'(~ fOllnd {hat more batteries could be charged wieh seemingly less strain on the charger by running two Jines off of rhe two,

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te ry·con nenions o n the s ide o f t he cha rgi ng. plug pand an d then hooki ng up "i (hCf a I11 2·\'o lt h:merics, or 2 sixes in serif's a nd p:,ra l. leI. or all sizes in par:dlcl to these (wo main charging wires. T he way we had it figured is chat inslCad of the current having to go through Ihe res istors on {he plug re(ept:ldc. and thus puc· ting an extra 10;ld o n the charger fo r e:lch battery by uking rhe currl.:nt frorn Ihe q u i(k dllrgcr (onne(tions, all (he cl1!:rgy (OLlId be uti li zed for durgi ng the batte r ies. I know th" book sa),s (0 hook up [\\'0 6'\"011 bau!:rics in se ries. or onc (wl:!vc vo lt h:wl:l"y to [hc's(: tcrrninals, hut jf }OLl hook up several 6·\'oh baHcrics in par:lllcl tht:)' will durgc O.K. Bdort: tluI, we h:ld a 24.vol( tank g"J)erator.and.rc.l!u!aror rigged up to an c!t:ctric mo(Or and put 4' 6·\'0Ir b.Hlcries in series and with -I or 5 S(:{S of tlh:se in para!kL I hope one of these ideas can be of value to you . If you want to get in touch w ilh me wh ile I' m on fn rlough, please writc to my home address til J gc: sl;!cded Oi.l 1'o(a(i;)11 in the U.S. I've b.:en in Korea since July 19;0. SFC Glen Hydop. R. \ 6254777 2 bt Ord M.MCo APO j01 c/o P~"' i. S.l.n Francisco

TOO LITTLE AND TOO LATE Edicor, PS j\bg:lZine Abe rdeen Proving Grou nd. Md. D ear Edicor, G Sepe 1951 Lec's don't neglect 1st and 2nd cchelon lll :"!intcnJ.nt:c, it will rost us in Ihe long run. I ren1l.: !1lbcr a sad expericIKc b:l(k in 1944 and 19.\5 in Italy where the mud and slush

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~. Motor Sergeant in a medium Field Artillery Batralion. We were on the move most of (he time and had barely enough vehicles for thc job. After we lost a vehicle, rhe Baw:ry had to load their "S9uvenirs" on other, loaded vchicles and sometimes c'Iuipmenr had to 'shuttled. Ordnance' had morc work than they (ould do, so we neglected our 2nd echelon and started to do 3ed cchdoll; replacing cngines, transmissions, axles, etc. I knew we were doing the wrong thing but we kept our veh icles rolling. I thought [hat we could get by with a li(t1e less 2nd echelon maintenance for a few weeks. :rhe fig/Hing got a l ink roughe r and we had to stay o n line longer. Finally, we pulled back into a rest area. Aft er we got settled down, most of (he boys were trying to find a clean uniform to wcar on pass. I decid ed that we should pull a few wheels and have a '1uick look at the brake shoes. Mao chat did id The "old man" snorted a couple of times and all the maintenan ce men did an about face and sta rted looking for fatigues. \Xfe had every man in the bauaiion who half-'way looked li ke a mechanic, doing mechanic's work. The brake shoe linings were gone, (he brake shoes ,,-,ere worn down so much that (hey could not be relined, the brake drums were worn too (hin to be (Uflled down, the wheel bearings werc dry, (he brake wheel cylinders wcre rust)'. the rear spring seat bearings were dry and frozen, and (he uni ve rsa l joints were dry and rust)' on about 75 ;;~ of our vehicles. \Ve all, from [he Baualion Commander on down, learned a lesson; but what a shameful an d cosily one. It was all due to 2nd echelon maimcnanrU U$e

PRODUCED UNDEI SPEOAl UCENSE TO U. S. DEPT. DEFENSE COPIt. 1951 WILL EISNEI PRODUCTIONS

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TEST FOR HYDRO·STATIC LOCK: SEfORE CLOSING MASTER BAnERY SWlTCH:HANK ENGINE TWO REVOlUTIONS BY HAND TO SEE If fLUID IS PRESENT IN LOWER CYLIN. DERS. If ENGINE WON 'T TURN READILY, DRAIN f LUID. _

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50 mT Of TANK.

16. DRIVER WHEN IN DOUBT-STOP. TANK (OMMANOER WHEN IN DOUBT SIGNAL DRIVER TO STOP. 17. SliIFT TO A LOW GEAR WHEN ASCENDING OR OBCfNOING A HILL. lB. 00 NOT DISENGAGE CLUTCH OR SHIFT INTO NEUTRAL WHEN OBCENDING HILlS. 19. 00 NOT (UT OFF IGNITION SWITCH WHEN DESCENDING HU. 20. EASE INTO AND OUT OF OITOIES AND HOLB. 2!. AlWAYS COME TO A COMPlfTE STOP BEfORE SlilfTiNG INTO REVERSE. 22. SLOW DOWN WHEN PASSING TROOPS OR OTHER VEHICLES. A BROKEN TRAex MIGHT CAUSE DEATH TO A LOT OF MEN. 8. KEEP 10 YAROS FADM CUIDE WHO SHOULD AVOID HOLES, WAllS OR IREB BEHIlIO HIM. 23. PASS A COLUMN ONLY WHEN ORDERED TO . • . BY A (OM· PETENT AUTHORITY. 9. AT NIGHT • • • STOP WHEN YOU CAN'T SEE GUIDE'S LIGHT

2. MAKE 5URE YOU'RE IN NEUTRAl BEFORE STARTING ENGINE.

RIDE STARTER NOT MORE THAN THIRTY SECONDS AT A TIME AND DON'T OVER PRIME EIIGIIU . • NEVER MOVE A .~[jIlClE BY fORCING IT INTO GEAR AND INGAGiNG STARTER, STOP EtlGlNE AT 0.(£ IF IN OOUBT ABOUT OIL-PRBSURE. AlWAYS":WARM,: Ur TANK B£lORE STARTING AND (DOl BEfORE STO!'~NG EtlGINE. • 00 NOT MOVE TANK WITHOUt COMMANDER'S ORDER • •• GllOUNO GUIDE RANKS EVERYONE.

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24. fiXED FIRE EXTINGUISHER OPERATES ONLY IN ENGINE COMPARTMENT-KEEP OTHERS REAOY.

25. WHILE REfUELING. SHUT OFF' ENGINE AND KEEP A MEMBER OF THE CREW ON THE BACK DECK OF THE TANK WITH APORT· ABlE FIRE EXTINGUISHER READY. 26. NEVER USE GASOLINE FOR ClEANING. 27. NEVER RUN A TANK ENGINE INDOORS WITHOUT PROPER VENTIlATION. 2B. NEVER SLEEP UNDER A TANK. IT MAY MOVE. 29. NO HORSE PlAY.

, . NO WITHIN so fEET Of TANK. T6. O~IVER WHEN iN DOUBT-STOP. TANK COMMANDER WHEN I. MAIlE SURE YOU'U IN NEUTRAl BEfORE STARTING ENGINt. IN DOUBT gGNAl DRIVER TO STOP.

1 RIDE ITARTER NOT MORE THAN THIRTY SECO"DI AT A TIME T7. IHIf1TO A lOW GEAR WHEN ASCENDING OR DESCENDING A

I. :~E:~~~EO~ER;:~:/':~":~RCING IT 'NTO GEAR AND

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ENGAGiNG ITARTER. • \TOP EllGiNE AI. 0"(£ W,0" DOUBT ABOUT ott.PRESIURE. AlWAYS' ;WARM.· UI' TANK BEfORE ITARTING AND COOL BEFORE STI1l'"NG EIIG'NE. • DO NOT MOVE TANK WITHOUL COMMA"OER'I ORDER . • • I Gl!DUNIl GUIDE RANKS EVERYONE. l KElP TO YAROI FROM GUIDE WHO \liOUID AVOID HOlES, WAttS OR FREES BEHIlID HIM. 9. AT NIGHT , , • 5TDt' WHE" YOU (AN'T SEE GUion UGHT gGNAl. I. DRIVER I NOUlD AlWAYI SEE YOU MOUNTING OR DIS· MOUNTING. •

'f. KElP HIPS BRO\'! NAT(H RIM OF MOVING TANK.

I. LOCK NATQ!E5 IN OPEN OR SHUT POIITION. GO YHRDUGH. WOODS HEAD FIRST ONLY. BUTTONEO·UPUSE GUN FOR fiRING, NOT WOOD·(HOPPING.

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:~\OT D~ENGAGE

ClUTCH OR IH'fT INTO NEUTRAl WHEN OESCENO'NG HillS. 19. DO NOT (UT OFF 'GNITION SWITCH WHEN DESCENDING HI~. 20. EASE INTO AND OUT OF DITCHES AND HOLES. 21. AlWAYS COME TO A (OMPUTE STOP BEfORE \liIFTING INTO REVERSE. 22. SlOW DOWN WHEN PASSING TROOPS OR OTHER VEHiClES. A BROKEN TRACK MIGHT (AUSE DEATH TO A lOT OF MEN. 23. PASS A COLUMN ONLY WHEN ORDERED TO .•. BY A COM· PETENT AUTHORITY. 24. FIXED FIRE EXTINGUISHER OPERATES ONLY IN ENGINE (OM· PARTMENT-IIEEP OTHERI READY. 25. WHltI REfUEliNG, SHUT OFF ENGINE AND KEEP A MEMBER

~:~:I~~T~~G~l~~(~Z;~~. Of THE TANK WITH A PORT· 26. NEVER USE GASOliNE FOR ClEANING. 27. NEVER RUN A TANK ENGINE INDOORS WITHOUT PROPER VENTIlATION. 2B. NEVER IlEEP UNDER A TANK. IT MAY MOVE 29. NO HORSE PlAY.

The crankcase ventilator-valve, a com- uum is high. When the engine speed is plete unit found on most War II-model increased,the manifold vacuum is lowengines,is no bigger around than maybe ered; the valve opens and lets dean air (hree cigarets and a couple of kitchen be drawn from the air-clea ner tube matches, and barely as long. In fact, the (through the engine oil-filler-pipe and crankcase ventilator-valve often isn't crankcase, and then through the venti·, found at all, and is neglected more than lator tube and valve) to ventilate the otherwise. crankcase. The manually-controlled valves like on Because it picks up muck and dc,gs the M34 breather system ,were described itself in doing its work,you've got to dean on Page 96, PS#3, and you learned about it to keep it opening and Closing-otherthe harm that could come to the engine wise it will conk out and so will the if you forgot to open them after under- engine. For instance, if the valve fails to water operation. (A similar, hand-con· seat good, the engine will act like it had a trolled valve is used on the M3S, '/.t-tOD.) leaky intake-manifold, and may have you An unventilated crankcase ' on 'Older- scratching to try and find the trouble. type vehides will also suffer from sludg. Remove the ventilator valve from the ing and corrosion when the ventilating engine and hold it snug in a vise to revalves aren't working for any reason, and move the top. Clean the valve and valve the valves don't have manual controls of seat with solvent, make sure the spring any kind. operates freely, and reasseriihle the valve. This little ventilator valve's job ;,.... to Check and dean all connecting tubes or scavenge the carbon and sludge-forming lines. Do this little job every 10,000 miles vapors from the crankcase. The valve is ... or more oiten, when vehicles are oper.. spring-loaded, and closes when the en- ated a lot at low speeds or at lqw enginegine is idling because the manifold vac.. temperatures.

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punching like a scrapping lightweight, can sometimes behave like a spoiled babe, Yet, those little nuisances that irritate; and ' make you forget what mama said about using swear words, usually have solutions. , Just snuggle up dose to your problem, try a couple of these tricks, o,!d maybe you'll find your answer.

OIL LINE SLACK If you're afraid of kinking your oil line

rounds of tape to hold it. You'Hlike chis one only if you aren't against cape as an interioC" 'decora~ion, Try these for size.

wich the JULY issue suggestion of turning (he oil filter one stud to stop the line from flopping against the manifold, here's 2. couple of more ideas. For one you can take the slack out of the I,ine by turning the clip attached to the timing gear cover, \Xfhen the closed part of the clip faces the center of the engine, you'vc got whac you want, In fact, vehides now in production are rigged this way. Another idea is to pull the line up through the bracket tight and then wind a few

SLIP JOINT ARROWS Those two arrows on the front and rear propeller-shafts on the old 1\-18 Jeeps are supposed to point our where the splined slip-joines arc lined up. Sometimes those arrows arcn'c shooting at each other and sometimes they aren't there at all. \Xfhen these joints aren't happily mated, it causes a whipping-vibration of the shaft that damages the universal joint. To sec things seraight, check those arrows and if ~.

I SLIP JOINT ARROWS

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REAR PROPELLER SHAFT

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FRONT PROPELLER SHAFT

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they're missing, mark the Spots before disassembling tbe unit and then tool [hem on.The ne w M3S's ne e d no arr ows because they have a blank spline leaving only one way to match these parts [0gether and thafs the right way.

WELD BRACKET SUPPORT \'X' hen you sec some jcepster with his hunky dragging. it's probably because the anchor-bracket support of his cail~ gate broke loose. You too can know this shame. The support is connected only at the top and often breaks loose, especially on the right side where the spare tire hangs and bounces. To keep a tighe hunky, all you gotta do is put some spoe welds down the sides of the supporr, thereby hanging the fail tight (0 the chassis.

STEERING GEAR LUBRICANT

caJIed for in \'X'DLO·s. PS nosied around and learned that the scuff the facrory uses is of the waterproof variety while the lube·order lube isn'c. This waterproof kind is cached for special purposes only, so use what's in the book and feci safe. \'X'hen you need some grease in the housing, it's better ro remove the factory lube than (0 mix the two because these lubes tend to separate jf packed in the same unit.

TIGHtEN PACKING NU1S When water seeps .oto your m.mlold

When )'OU opened the steering gear through your ",indshietd wiper when housing you found the lubricant was a you're fording, or air into your gas line different color and consistency than chal through your primer pump .. handle, 202

brother, your nuts ;uc loose, You o ug hn. keep the packing nuts ti.ght on both these openin gs if you W;'lI.llI;& swim up [he opposite bank.

p rim er to start your It'l38 on nippy mo rn ings ( whe:n you o ug hta be usi ng you r choke instead ( may nOt (U rn our to be a l\I icke}i Fit'lIl, bue probably will give: your engjm~ a preu}' bad hangover. Such ca rRADIUS STOP SCREWS rrin gs-on ca n da mage your en g ine no Should )"our vchicle rub irs ( ra nt end bel.:a usc o f e xcessive crankcase di lu " 'heels :lgain.st [,he hold down brackcts cion and ' migh t even g Ct it headed for lI,'hen you're ma king h:lrd turn s~ i[