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WILLYS JEEP 1954-55
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*+REAR MAIN OIL SEAL PRODUCTION CHANGE—Neoprene type seal replaces rope type. See Willys Special
Data.
Bearing Adjustment: None (no shims). Replace bearings. Do not file bearing caps. See Crankshaft Servicing instructions in Willys Special Data.
NOTE—Engine must be removed from chassis for
bearing replacement and crankshaft servicing.
Replacement Bearings: Furnished Standard & .010",
.020" .030" Undersize.
End Thrust: Taken by flanged faces of # 1 (front)
bearing. Adjustable by adding or removing shims
between crankshaft sprocket thrust washer and
sprocket.
Endplay—.004-.006".
^FLYWHEEL RING GEAR REPLACEMENT CAUTION:
Different flywheels used as follows: 97 teeth (CJ-3A
with Old Type Std. Bendix Drive); 124 teeth (CJ-3A
through Serial Number 30973 with overrunning
clutch type drive); 129 teeth (All Models after
CJ-3A, Serial No. 30973 with Bendix "Folo-thru"
type drive. CAUTION—Replacement ring gear must
have the same number teeth as the original.
CAMSHAFT: Four bearing, helical gear drive.
Journal Diameters—#1 2.1855-2.1860", # 2 2.12152 1225". # 3 2.590-2.600", # 4 1.6225-1.6230".
Bearings—Removable steel-backed, babbitt-lined
bushing (front),machined in crankcase (all others).
Clearance—.001-.0025". Service limit .006" (front),
.008" (all others).
Camshaft Removal—See Willys Special Data.
End Thrust: Taken by thrust plate behind camshaft gear
Endplay controlled by spacer between camshaft gear
and shoulder on shaft Endplay can be increased by
installing shim between spacer and shaft, or decreased
by dressing off spacer NCTE - Inner beveled edge of
spacer must be toward crankcase
Endplay—.003-.0055".
Timing Gears: Crankshaft gear, steel. Camshaft gear,
fibre with steel hub.
Gear Backlash—.000-.002".
Camshaft Setting: Mesh marked tooth of camshaft
gear with marked space (between teeth) on crankshaft gear.
VALVES:
Valve
Intake
Exhaust
Valve
Intake
Exhaust
("L" Head Engine)
Head Diam.
Stem Diam.
Length
1 17/32"
373"
5 51/64"
1 15/32"
3725"
5 51/64"
Seat Angle
Lift
Stem Clearance
—.45°
23/64"
0015-.00325"
45°
_
23/64"
0025-.0045"
Valves CT" Head Engine)
Valve
Head Diam.
Stem Diam.
Length
Intake
2"
3733-.S738"
4.937"
Exhaust
1 15/32"
371-.372"
5.909"
Valve
Seat Angle
Lift Stem Clearance
Intake
45°
260"
0007-.0022"
Exhaust
45°
351"
002-.00375"
k-EXHAUST VALVES ("¥" HEAD ENGINE) NOTE—
Thompson "Roto-Valve" or Eaton "Free Valve" rotators used.
Valv Guides ("L" Head Engines): Removable type.
Remove guides from above with puller, install new
guides with driver or press guides down in place to
following dimensions:
Intake Guide—Top of guide 1 5/16" below top face
of block. The shorter, smaller-diameter section end
of guide should be up.
Exhaust Guide—Top of guide 1" below top face of
block. Taper end (counter-bored end) of guide
should be up.
Valve Guides ("F" Head Engine): Removable type.
Drive guides out with Tool W-240. To install, use
W-240 with correct adapters to install guides:
Intake Guide—Drive guide in with taper end toward valve seat until inner end flush with port wall
at guide hole.
Exhaust Guide—Drive guide down in block with
taper end up toward valve seat until upper end 1"
below top face of cylinder block.
Valve Springs: CAUTION—Intake valve springs on " F "
Head Engines are different than other valve springs.
See Spring Data below.
Valve Springs ("L" Head Engine)
Free Length—2*/2" (Intake and Exhaust).
Intake & Exhaust
Spring Pressure
Length
Valve Closed
53 lbs
2 7/64"
Valve Open
120 lbs
1%"
Valve Springs ("F" Head Engine)
Free Length—1 31/32" (Intake), 2V2" (Exhaust).
Intake
Spring Pressure
LengfBi
Valve Closed
73 lbs.
121/32"
Valve Open
160 lbs.
13/8"
Exhaust
Spring Pressure
Length
Valve Closed
53 lbs.
2 7/64"
Valve Open
120 lbs.
1 3/4"
Valve Lifters: Mushroom type operating in reamed
holes in block. Serviced by installing oversize lifters.
Lifters furnished .004" oversize.
Lifter Diameter—.6240-.6245".
Lifter Clearance—.0005-.002".
NOTE—Camshaft must be removed for lifter removal and replacement.
VALVE TIMING
Tappet Clearance: ("L" Head Engine)—016", all
valves hot or cold. ("F" Head Engine)—.018" (Intake), .016" (Exhaust —With "Thompson RotoValve"). .012" (Exhaust—With "Eaton Free Valve").
Adjust "F" Head Engine valves with engine cold.
NOTE—Adjusting screws are self-locking type.
Valve Timing: See Camshaft Setting above.
Intake Valves—Open 9° BTDC. Close 50° ALDC.
Exhaust Valves—Open 47° BLDC. Close 12° ATDC.
Valve Timing Check—Adjust No. 1 cylinder Intake*
valve lash to .020" ("L" Head Engine). .026" ("F"
Head Engine) with tappet resting on low side of
cam lobe. Rotate crankshaft until No. 1 cylinder is
coming toward top of cylinder on exhaust stroke,
then continue to rotate crankshaft until No. 1 intake tappet is JUST TIGHT against valve stem
indicating that valve is about to open. Check position of ignition timing mark on crankshaft pulley
(5° BTDC) and estimate crankshaft position (5°
mark should be approximately XA" before reference
point on timing gear cover). Reset tappet clearance
to correct running clearance as given above.
LUBRICATION
-ENGINE
OILING SYSTEM: See "Engine
Lubrication"
und r OILING SYSTEM in Willys Sp cial Data.
Crankcas
Capacity • 4 qts.
Normal Oil Pr ssure • 35 lbs. at 35 MPH.
Oil Pressur
Regulator—Under plug on side of
housing. Opens at 40 lbs. Adjustable by addgump
lg or removing shims located above spring in plug.
Oil Pump: Rotor type pump mounted on left side of
crankcase.
Oil Pump Overhaul—See Willys Special Data.
Oa Filter: Purolator. On cylinder head bracket at
right front corner of cylinder head with oil outlet
connected to timing gear cover.
*>CAUTION—Filter should be drained at each crankcase oil change (2000 mile intervals) and filter element replaced every 8000 miles (normal service).
Oil Pressure Gauge: (CJ-3A)—Auto-Lite No. 121250-A;
(Early CJ-3B)—Auto-Lite No 11987-A; (Late CJ3B & CJ-5)—Auto-Lite No. 121250-A. Bourdon tube
type, not electric
C O O L | N G
Cooling System: Pressure type with pressure valve
(relief valve) in filler cap.
Capacity—11 qts. (12 qts. with Heater).
Pressure Valve—Radiator filler cap. Opens at 7 lbs.
Water Pump: Centrifugal, packless, ball bearing type.
See Water Pump in Willys Special Data.
Removal—Loosen and remove drive belt, disconnect
hose. Remove pump mounting screws, lift out pump
Belt Adjustment—See Generator Belt Adjustment.
Thermostat: Harrison. In water outlet elbow m cylinder head. Starts to open at 151 °F (148°F mm.).
Temperature Gauge (Exc. CJ-5): Auto-Lite No.
12149-A (CJ-3A); No 11986-A (Early CJ-3B); No.
12149-A (Late CJ-3B). Bourdon tube type Not electric
Temperature Gauge (CJ-5): King-Seeley "CV" (Constant Voltage) electric type
Dash Unit—K-S No 46832 (with 100 MPH Speedometer). No. 46833 (with 80 MPH Speedometer)
Engine Unit—K-S No. 44230.
CLUTCH
Auburn 8501.23 & 8501-39 or Rocktord M d I 8KRM.
Used with Borg Si Beck driven member. Single plate,
dry disc type.
See Clutch Section for complete data.
Facings—Woven asbestos. I.D. 5YQ". O.D. 8V2".
Thickness .135" (.132-.138").
Pedal Adjustment: Set pedal free travel to 1" (to provide 1/16" clearance between release bearing and
clutch release levers). Adjust length of clutch control cable at clevis Screw Cable end in or out of
clevis. Tighten locknut
Removal: Remove transmission (Transmission & Case
Assembly), see below Remove flywheel bell housing.
Mark clutch pressure plate and flywheel to insure
installation in same position Remove clutch cover
screws evenly to remove spring pressure, then remove clutch assembly and driven member.
TRANSMISSION
Warner Model AS1-T90C (Floor Mounted Gearshift). Three speed type. Constant-mesh, synchromesh, helical gears (second & high), sliding spur
gear (low & reverse).
See Transmission Section for complete data.
Transfer Case: Spicer or Warner. Two-speed auxiliary
transmission and front-wheel drive unit mounted
on rear of transmission case. Separate control levers provided for Low-High range (right hand lever),
and front-wheel drive engagement (left hand lever).
See Transmission Section for complete data.
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