4-134 L Engine Specs - M38

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

4-134 L Head Engine

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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

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