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4-134 L Engine illustration shown for reference only - click here to shop for these parts by interactive diagram

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Looking for Engine parts for your vintage Willys or Jeep? Search Engine by Category or by Diagram

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Engine Specs:
Type	L-Head
Number of Cylinders	4
Bore	3 1/8"
Stroke	4 3/8"
Piston Displacement	134.2 cu. In.
Bore Spacing (center to center):
1 and 2, 3 and 4	3.437"
2 and 3	4.938"
Firing Order	1-3-4-2
Compression Ratio	7.00:1
Compression Pressure	90 to 110 psi.
Number of Mountain Points:
Front	2
Rear	1
Horsepower (SAE)	15.63
Horsepower (Max. Brake)	60@4000 rpm.
Maximum Torque @ 2000 rpm	105 lb-ft.
Idle Speed	600 rpm.
Piston Specs:
Material	Aluminum Alloy
Description	Cam Ground, T-Slot, Tin or Brass Plated
Length	3 3/4"
Diameter (near bottom of skirt; right angle to pin)	3.1225: - 3.1245"
Weight	13.5 oz.
Clearance Limits:
Piston-To-Cylinder Bore	Selective Feeler Fit
Ring Groove Depth:
No. 1 and 2 Ring	.1593" to .1655"
No. 3 Ring	.1693" to .1755"
No. 1 Ring	.0955" to .0965"
No. 2 Ring	.095" to .096"
No. 3 Ring	.1875" to .1885"
Piston Pin Hole Bore	.8120" to .8122"
Cylinder Bore:
Standard	3.125" to 3.127"
max. out of round	.005"
max. taper	.005"
max. rebore	.040"
Piston Ring Specs:
Function:
No. 1 and 2	Compression
No. 3	Oil
Material:
No. 1	Cast Iron, Chrome-plated Face
No. 2 and 3	Cast Iron
Width:
No. 1 and 2	3/32"
No. 3	3/16"
Side Clearance in Groove:
No. 1 Ring	.002" to .004"
No. 2 Ring	.0015" to .0035"
No. 3 Ring	.001" to .0025"
Connecting Rod Specs:
Material	SAE 1141 Forged Steel
Length (center to center)	9.187"
Bearing:
Type	Removable
Material	Steel-backed Babbitt
Length Over All	1.089" to 1.099"
Clearance Limits	.001" to .0019"
Undersize Bearings Available:	.001"
	.002"
	.010"
	.012"
	.020"
	.030"
End Play	.004" to .010"
Out-of-round and out-of-taper limits	.001"
Installation	From Above
Bore:
Upper	.8115" to .8125"
Lower	2.0432" to 2.0440"
Crankshaft Specs:
Material	SAE 1040 Forged Steel
End Thrust	Front Bearing
End Play	.004" to .006"
Main Bearings
Type	Removeable
Material	Steel-backed Babbitt
Clearance	.0003" to .0029"
Journal Diameter	2.3331" to 2.3341"
Undersize Bearings Available:	.001"
	.002"
	.010"
	.012"
	.020"
	.030"
Bearing Length:
Front	1.64"
No. 2	1.72"
No. 3	1.66"
Out-of-round and out-of-taper limits	.001"
Direction of Cylinder Offset	Right
Amount of Cylinder Offset	.125"
Crankpin Journal Diameter	1.9375" to 1.9383"
Flywheel Run Out (max.)	.005"
Camshaft Specs:
Material	Steel-backed Babbitt
Number	4
Clearance	.001" - .0025"
Journal Diameter:
Front	2.1860" to 2.1855"
Front Intermediate	2.1225" to 2.1215"
Rear Intermediate	2.0600" to 2.0590"
Rear	1.6230" to 1.6225"
Bearing Diameter:
Front	2.1870" to 2.1890"
Front Intermediate	2.125" to 2.126"
Rear Intermediate	2.0625" to 2.0635"
Rear	1.625" to 1.626"
End Play	.004" to .007"
Drive Type	Gear
Crankshaft Gear	Cast Iron
Camshaft Gear	Pressed Fiber-Steel Hub
Valve System Specs:
Clearane-Cold:
Intake	.016"
Exhaust	.016"
Clearance for Timing (intake)	.020"
Over All Length:
Intake	2 7/8"
Exhaust	2 7/8"
Stem Diameter	.6245" to .6240"
Clearance in Block	.0005" to .002"
Timing:
Intake
Opens	9° BTC
Closes	50° ABC
Duration	239°
Exhaust
Opens	47° BBC
Closes	12° ATC
Duration	239°
Valve Opening Overlap	21°
Valves:
Intake
Material	SAE 5150
Length Over All	5.797"
Head Diameter	1.531"
Angle of Seat	45°
Stem Diameter	.373"
Stem-to-Guide Clearance	.0007" to .0022"
Lift	.351"
Exhaust
Material	Uniloy 21-12
Length Over All	5.797"
Head Diameter	1.47"
Angle of Seat	45°
Seat Insert Material	Eatonite EMS 58
Stem Diameter	.371" to .372"
Stem-to-Guide Clearance	.0025" to .0045"
Lift	.351"
Springs:
Free Length	2 1/2"
Pressure @ Length: Standard:
Valve Closed	53 lb. @ 2.109"
Valve Open	120 lb. @ 1.750"
Service Minimum
Valve Closed	47 lb. @ 2 7/64"
Valve Open	110 lb. @ 1 3/4"
Lubrication Specs:
Type of Lubrication:
Main Bearings	Pressure
Connecting Rods	Pressure
Piston Pins	Splash
Camshaft Bearings	Pressure
Tappets	Splash
Timing Gears	Nozzle
Cylinder Walls	Nozzle
Oil Pump:
To Engine S/N 44417:
Type	Planetary Gear
Drive	Camshaft Gear
Minimum Save Oil Pressure @ Idle	10 psi.
Relief Valve Opens	25 psi.
Normal Gauge Reading	50 @ 30 mph.
Engine S/N 44417 and On:
Type	Internal Rotor
Drive	Camshaft Gear
Minimum Save Oil Pressure @ Idle	6 psi.
At 2000 rpm. (35 mph.)	20 psi.
Relief Valve Opens	40 psi.
Normal Oil Pressure	35 psi. @ 2000 rpm.
Oil Pressure Sending Unit	Electric
Oil Intake	Floating
Oil Filter System	Partial Flow

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* Learn more about the 4-134 L engine from the Master Parts List Manual for 50-52 M38

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