Willys MB User manual

WILLYS MODEL "MB" %-TON 4 x 4 GOVERNMENT TRUCK
3.
GENERAL DATA
ENGINE
Type..
.................................................... .Gasoline
Number of Cylinden.. ...................................... .4
Bore.. ....................................................
.3 x::
Stroke. ................................................... ,434
Piston Displacement ........................................ ,134.2 cu. in.
Compression Ratio. ......................................... .6.48-1
Horsepower-S.A.E.. ................. : ...................... .15.6
Actual.. ...................................... .G0
Revolutions per minute.. ....................... .4000
Horsepower { .
Torqiie Maximum Lbs.-Ft .................................. .l05
I Revolutions oer Minute. ........................... .Z000
Wheelbase ....................................
Tread. ............................ .48%"-with
Overall Widtli .................................
Overall Lengtli.. ..............................
Overall Height-Normal Load
To top of cowl.
.......................
To top of steering wheel.. ..............
Topup ...............................
Weight-Maxinium Pay Load.. .................
............... Maxiiniiin Trailed Load.
Shipping (Less water, fuel aiid cliains). ..
Koad
Gross ................................
.............. 80"
I combat wlieels 49"
.............. C2"
............. .132%"
............. .40"
............. .5 1 X!'
.............. 69W
.............. 800 Ibs.
............. ,1000 Ibs.
............. ,2125 Ibs.
............. ,2315 Ibs.
............. .3125 Ibs.
CAPACITIES
U.S. Imperial Metrlc
Fuel Tank (Cals.). .................................
.l5 12% 56.78 liters
Eiigine Crankcase-Refill (Qts.). ...................... .4 3%
3.78 "
Cooling Systerii (Qts.). ..............................
l1 I 10.41 "
Traiismission (Pts.) ................................ .2 l
.95 "
Transfer Case (Pts.). ...............................
.9 2% 1.42 "
Front Axle Oifferential (Pts.). ....................... .Z% 2 1.18 "
liear Axle Difícrential (I'ts.). ........................
.3% 2 1.18 "
Oil Bath Air Cleaner (Pts.). ..........................
l >.i 1 .71 "
Brake Systeni Rrake Fluid (Pts.). .....................
. X .3li "
See 1.librication Chart, Page 12
1,AMP BU1,BS Mazdri
Head Lamp (Sealed Beam type). ............................. .Z400
Upper Beam.. ..................................... .45Watts
Lower Ream..
..................................... .4,5 Watts
Blackout Lamp Bulb (1).
.................................... .3 Cp. SC G3
Left Tail Lamp Rulb (1). ................................. .-l-3 Cp. DC 1154
Left Tail Lamp Rulb (1). .................................... .3 Cp. SC 63
Right Tail Lamp Bulbs (2). .................................. .3 Cp. SC (i:<
Instrument Lamp Bulb (2). ................................ .1.5 Cp. SC 51
Fuse (Thermal Type)-On Light Switch-30 Amperes
Chassis Serial Kumber locoted on inside of frame at
Ieft Iroiit end.
Engine Numl~cr lucated on right side of cylinrlcr block
iron1 upper corner.

WILLVS MODEL "MB" NTON 4 x 4 GOVERNMENT TRUCK
02-5
DRIVER'S INSTRUCTIONS
This vehicle should nol be dewen jasler than 40 miles an hour for the firsl 100 miles nor more
lhan 50 miles an hour from l00 to 500 mihs. Ij lhe wehicle is opernted at ewcessive speeds while
nm, lhe closely fillcd parts may possibly become overheatcd, resulfing in serious damage ia mcchnnical
units. Never race the Enginc while making adjusiments or u~henvehicle is standint idle.
é 7 8 91011 i2i3i4i6i'si7ieioeoz'iizisi426is
FIG. l-CONTROLS
Itisvery important that tliedriver of this vehicle to second position. This closes eritire briglit light
be thoroi~ghlyfamiliar with tlie various Controls circuit, which consists of two Iiend lanil~s-instru-
and their nroper use. The most exnerienced driver ment Danel lam~s.sto~and tail Iamos.
should study the Controls becaise there are a
number wliich arenot ordinarily found on standarcl
vehicles.
Illustrations show the controls, instruments and
instruction plates; in tlie following paragraphs we
reler to these illiistrations by the key numbers so
tlie reader may easily follow tlie instructions.
Ignition Switch-No.
9, Fig. 1
Isoperated by a key, turning key to right (clock-
wise) closes tlie ignition circuit. Turning key to
Ieft (counter clockwise) opens the ignition circuit
and shuts off tlie engine.
Light Switch-No.
6, Fig. 1
Theliglit switch is the push-pull type with safety
lock.
This switch coiitrols tlie entire lighting system
including the instrument panel liglits and stop
lights.
When the control knob is pulled out to the first
position, the blackout lamp circuit is closed-wliich
consistsof two blackout lamps, stopand tail lamps.
To obtain bright lights, push in lockout control
button on left of switch and pull out control knob
.. .
CAUTION: When driving during the day press
in lockout control biitton and pull Coiitrol Knob
out to the last or Stop Light position to ratise
regular Stop Light tooperate.
Panel Light Switch-No. 12, Fig. 1.
The Panel Light switch controls tlie Pniiel 1,iglits
when the mairi Light Switcli is iii Service (1,riglit
light) position. otlierwise tlie Panel Liglits do iiot
operate.
HeadLampBeamControlSwitch-No. 8, Fig. 1
Pressing and releasing tlie biitton of tlie selector
foot switch with tlie left foot alterriately cli;iiiges
the headliglit beam from high to low.
Starter Switch-No. 23, Fig. 1
Toe board mounted to the riglit of tlie arceler-
ator; pushing button down closes starter circuit
and causes starter to crank erigine-release tlie
button assoon as the engine starts.
Hand Throttle-No. 10, Fig. 1
Pulling control button out opens cnrbiiretor
throttle valve and increases engine speed.

02-8 w11.1.ï~ MODEL -\rnW !<-TON
-
Press on :iccelerator and release clutch pdal
slowly. Repent these operatioris until traris-
iiiission is iri Iiigli gear.
S1111~TINCCEARS IN TRANSFER CASE
Instructioiis lor sliifting gears in transfer case
and eiigageiiient of tlie front axle drive are as
follows: No. 21, Fig. l :incl Fig. 4.
1. Traiisfer case niay be nperated in either
IiigIi or low sl>eeilraiige wlieii front axle drive
is liNGAG131).
2. Tlie transfer case can t>e operaled oiily in
"Iligli" (direct drive) wlicri froiit ax'e drive
is DISENGAGED.
3. To engage frorit axle drive. depress cluicli
pedal, release accelerator and more center sliift
lever to rear ~>ositioii.No. 21. Fig. 1.
4. To
disengage front axle drive. release accelera-
tor ancl sliift lever tv forward position.
5.
Sliiftiiig frniii Iiigli to low gear slioiild not be
atieiiiptcil escept \\.lien tlie veliicle is being
nl>eratwlat IOIV speeds or at n standstill. Tlie
froiit axle <Irivciiiiist be engagecl [«r tliis sliift.
Iklease acceleratirr aiid depress clutch pcdal-
move reriicr sliift lever to rear positiori, engag-
iiig front wlieel drive, No. 21. Fig. I. then niove
riglit li;iiiil sliift Icver, Sn. 22. to forward posi-
tinii.
G.
Sliifiiiig frfiiii I<iwto IiigIi ycar niay be accíiiii-
plislie<l;it aiiy tiiiie, reg;irclless of vehicle sl>ccd.
I<r.lc:isc:ici:clrrat.or ani1 (lel~resscliitcli peilal-
sliift riglit Iiniid Icver iiito rear positiori.
SIIIFTING T0 LOWER SPEED IN
TRANSRtISSION
Tlie transinissinii gears slii~uldalways he sliifted
to tlie iiext lowrr speed before engiiie begins to
Ial>«ror before veliiclc sl>ecdis rediiced appreciably.
Sliifting to luwer speed is accoml~lisliedas follnws:
1. Depress clutcli pcclal quickly, increase engirie
specd and sliift to ricxt lower gear, rclcase
clutcli slowly aiid aceelerate.
Itis advisable to iise tlie saine transmissii>iigear
going clown a Inrig Iiill as wi~iilrlbe reqiiireíl io
climb tlie =me hill.
STOPPING TIIE VEIIIC1.E
1. Remove font froiii accelerator peilal and apply
hrakes hy pressing dowii «ti brake pedal.
No. 14. Fig. 1.
-
2.
\I!heii veliicle speed Iias been re<luce<lto idling
eiigiiie speed. clisengagecliitcli ;ind iiiove tratis-
mission sliift lever. So. IS. Fig. I to neutral
p.>sitii)n. See Fig. 4.
3. Wlicii veliicle Iias come tij n roniplete stop
ay>l>lyhand brake, No. 24, Fig. l. aiid release
clutcli and brake pedals.
SIIIFTING INT0 REVERSE
Hefnrezittemptingtosliift intoreverse the vehicle
iiiiist be I~roughtto a complete stop.
1. Push clutcli pedal down to ilismgagc clutcli.
2. Shift transmission lever to tlie lelt aiid forward
toward instrurnetit board. Fig.
4.
3. Release clutch peclal slowly aiid arrel~rateas
Inad is pirke<l UI).
TOWING VEIIICLE
When necessary tn tow x-ehicle tlie tow chain.
rope or cal>le, slioiilcl Ije attaclied to tlie front
hi~ml~er!>araiid frame sicle rail giisset. Fig. 5 and G.
I.oi>p cliaiii or rope over tnp of huinper aiid
franie giisset briiiyiiig it iip ;icri>ssface of bumper
arid b;irk on iq~rx)sitcsiilr (if frame, tlicti liook «r
tic. Do iiot tow frorn tlie iiii<l<lleof tlic bilinper.
FIRE EXTINGUISIIER
The fire extiiiguislier is mounted on left side
cowl panel Fig. I.
l'o rerniivc piill oiit\v;ird on
clamp release lever.
'I'o olterate extingiiislier, Iiold body iii olie Iiatid
ancl witli tlie otlier tiirii Iiaii<lle to lelt !d turii
wliicli releases pluiiger lock. IJse piiiiiping actioii
to force Huid oii fire.
Ilen<linstriictions o11Tire extingiiisher plate.

WILLYS MODEL "hlR" X-TOX 4 x 4 GOVERNIIENT TRUCK
01W-17
ENGINE
(NEVER RUN ENGINE IN CLOSED GARAGE)
Due 10 the fwesence of carbon monoxide (a poisonous gas in llie exhausi of the engine) nmcr run the
mgim for any length of lime while tkis vehicle isin.a smal1 closed garage. Openint lhe doors and
win-
dows lessens Ihe danger considerably, bul i6 issafest, if arljuslmenls are being made thal regzrire operation
of engine, 10 rrrn Ilre vehicle orrl of doors.
12
31
10
P')
i's
.4.
FIG. I-SIDE SECTIO'IAL OF ESGINE
Tlie eiigine is n 1:our-Cyliiitler L licad type iiiiit ances of al1 componeiit parts. On Page
34 Iieaded
eqiiipped witli a counter-bnlaiiced crankshaft. "Engiiie Troiibles and Caiises" are listed many
At end of tliis section wil1 be found the Eiigiiic reasons lor engine failurc or poor performance.
specifications. When adjiistinents are necessary we I;or correction of tlicse diihculties you wil1 find the
recommend tliat reference be made to these speci- prncediire to follow iitider separate Iieaclings in this
fications for proper running tolerances and clear- section.

WILLYS MODEL "MB" %-TON 4 x 4 GOVERNMENT TRUCK
OLM-19
Wlllyi Pord
Part Part
No. No. No.
FIG. 3-FRONT SECTIONrZL OF ENGINE
Name
Igniiion Coil
Ignitloo Dlrvibutor
Dhvibutor Oilri
Oil Rllcr Capsnd Level Indiralor
Oil Filler Tube
Oil Float A,wmbly
Clpokahafl Burin. Cap u> Cnnkear
%a
Crpohhdt Bcaring Dow
011 Float Supmn
O11 Pan Dnio Plug
Oil Pan A-bly
Oil Pump Shaft pnd Rotor A~mbly
011 ReUel Pluusu
Oil Reliel Pluopc. Spriop
Wlllys Pord
Part Pnrr
No. No. Na.
N.me
Oil Reliel Pliinser Spring Shlmi
Oil Rrlid PIYUCI Sprin~ReLPIce
Oil Pump Pidon
Oil Pump Auembly
Oil Pump Rolor Mr
Oil Pump Sbf,
Oii Pump Body U> CylindoBI& G:
DiNibulor ShsflFcIcUo~SprLn~
CnntcracVcoUlilor Awmbly
Exbus~ ManiIold Auembly
Crad9.c VcnUIatn BiNc
Hut Cantiul Vrlve
Vdrc Si~rin~ Cuvcr Auemblv
. -
InbteManifald Aumbly
Exliauir Valve Guidc