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Continental Z120 Engine

General Technical Data

Continental Z120 Engine Specifications

Engine Model ............... Continental Z120
Engine Type ............... 4-cycle 8-valve liquid-cooled gasoline engine
Number of Cylinder ............... 4
Displacement, cu.in (L) ............... 119.7 (1.96)
Cylinder Bore, in (mm) ............... 3.19 (81.0)
Piston Stroke, in (mm) ............... 3.75 (95.0)
Rated Engine Power, Hp (kW) ............... 28.0 (20.5)
Engine Speed, rpm ............... 2200
Maximum Torque, Nm (ft-lb) ............... 119 (88)
Torque Speed, rpm ............... 1200
Compression Ratio ............... 6.1:1
Firing Order ............... 1-3-4-2
Air Cleaner Type ............... Oil bath
Cooling System ............... Water cooling radiator
Coolant Capacity, qts (L) ............... 10.0 (9.5)
Ignition System ............... Distributor
Electrical System Rating, Volts ............... 6
Charging System ............... Generator
Generator Rating, Amps ............... 25

Fuel System

Fuel System ............... Carburetor
Carburetor Model ............... Marvel Schebler TSX461A
Carburetor Type ............... Float
Fuel Type ............... Unleaded gasoline

Lubrication System

Lubrication Type ............... Forced lubrication by pump
Crankcase Capacity, qts (L) ............... 6.0 (5.7)
Oil Pressure at Idle (400 rpm), psi (kpa) ............... 15 (103.5)
Oil Pressure at Full Throttle (2200 rpm), psi (kpa) ............... 20-30 (138-207)
Oil Pump Gear Backlash, in (mm) ............... 0.007 (0.178)
Oil Pump Gear Side Clearance, in (mm) ............... 0.003-0.004 (0.076-0.102)
Drive Gear Backlash, in (mm) ............... 0.005-0.010 (0.127-0.254)

Ignition System

Spark Plug Type ............... AC 86 or Champion 8
Ignition Distributor ............... Lucas D3A4
Ignition Timing, deg ............... 27-31 B
Electrode Gap, in (mm) ............... 0.025 (0.63)
Breaker Gap, in (mm) ............... 0.015 (0.38)

Continental Z120 Maintenance Data

Engine Oil

Engine Oil Type ............... SAE 10W, 20W, SAE 10W-30
Oil Capacity (with Filter), qts (L) ............... 7.0 (6.6)
Oil Capacity (without Filter), qts (L) ............... 6.0 (5.7)

Carburetor Adjustments

Carburetor Model ............... Marvel Schebler TSX461A
Float Setting, in (mm) ............... 0.28 (7.1)
Fuel Level, in (mm) ............... 0.47 (11.9)
Idle Mixture Screw ............... 7/8 turn
Power Jet Needle ............... 1-3/8 turns
Low Idle Speed, rpm ............... 400-500
High Idle Speed, rpm ............... 2000-2200

Service Intervals

Check Engine Oil Level ............... Every 10 hours
Check Fan Belt Tension ............... Every 50 hours
Clean and Adjust Spark Plug ............... Every 100 hours
Change Engine Oil ............... Every 100 hours
Replace Engine Oil Filter ............... Every 200 hours
Check Carburetor Adjustment ............... Every 200 hours
Check and Adjust Idle Speed ............... Every 200 hours
Replace Spark Plug ............... Every 500 hours
Clean Fuel Hose ............... Every 500 hours
Check and Adjust Valve Clearance ............... Every 500 hours

Continental Z120 Service Specifications

Cylinder Block

Cylinder Sleeves ............... Wet
Cylinder Bore Inside Diameter (Std), in (mm) ............... 3.1875-3.1895 (80.963-81.013)
Cylinder Bore Inside Diameter (Max), in (mm) ............... 3.199 (81.255)
Cylinder Bore (Max Out of Flatness), in (mm) ............... 0.001 (0.025)
Cylinder Bore (Max Taper), in (mm) ............... 0.002-0.0015 (0.05-0.038)
Crankpin Outside Diameter, in (mm) ............... 1.937 (49.199)
Crankshaft Journal Diameter, in (mm) ............... 2.250-2.249 (57.15-57.12)
Crankshaft End Play, in (mm) ............... 0.003-0.007 (0.076-0.178)
Crankshaft Bearing Oil Clearance, in (mm) ............... 0.0015-0.0025 (0.038-0.064)
Connecting Rod Journal Diameter, in (mm) ............... 1.9375-1.9365 (49.213-49.187)

Cylinder Head and Valves

Cylinder Head (Max Out of Flatness), in (mm) ............... 0.003 (0.08)
Number of Valves ............... 8
Valve Head Diameter (Intake), in (mm) ............... 1.010-1.020 (25.654-25.908)
Valve Head Diameter (Exhaust), in (mm) ............... 1.135-1.145 (28.829-29.083)
Valve Clearance (Intake), in (mm) ............... 0.015 (0.381)
Valve Clearance (Exhaust), in (mm) ............... 0.015 (0.381)
Valve Face Angle, degrees .............. 45
Valve Seat Angle, degrees .............. 45
Valve Margin (Intake), in (mm) ............... 0.047 (1.191)
Valve Margin (Exhaust), in (mm) ............... 0.047 (1.191)
Valve Stem Diameter (Intake), in (mm) .............. 0.3141-0.3149 (7.978-7.998)
Valve Stem Diameter (Exhaust), in (mm) .............. 0.3124-0.3132 (7.935-7.955)
Valve Overall Lenght (Intake), in (mm) ............... 3.969 (100.81)
Valve Overall Lenght (Exhaust), in (mm) ............... 4.063 (103.20)
Valve Guide Inside Diameter, in (mm) .............. 0.3177 (8.0696)
Valve Spring Free Length, in (mm) ............... 2.0625 (52.388)
Rocker Arm Shaft Diameter, in (mm) .............. 0.622-0.623 (15.799-15.824)
Rocker Arm Bushing Diameter, in (mm) .............. 0.624-0.625 (15.849-15.875)
Camshaft Journal Diameter (Front), in (mm) ............... 1.8090-1.8095 (45.949-45.961)
Camshaft Journal Diameter (Center), in (mm) ............... 1.7460-1.7465 (44.348-44.361)
Camshaft Journal Diameter (Rear), in (mm) ............... 1.6835-1.6840 (42.761-42.774)
Camshaft End Play, in (mm) ............... 0.003-0.007 (0.076-0.178)
Camshaft Bearing Oil Clearance, in (mm) ............... 0.0025-0.0045 (0.064-0.114)
Camshaft Bearing Diameter (Front), in (mm) ............... 1.8115-1.8125 (46.012-46.038)
Camshaft Bearing Diameter (Center), in (mm) ............... 1.7490-1.7500 (44.425-44.450)
Camshaft Bearing Diameter (Rear), in (mm) ............... 1.6865-1.6875 (42.837-42.863)

Piston and Piston Rings

Piston Pin Outside Diameter, in (mm) ............... 0.8591-0.8593 (21.821-21.826)
Piston Skirt Clearance, in (mm) ............... 0.0012-0.0017 (0.030-0.043)
Compression Ring Width, in (mm) ............... 0.1250 (3.175)
Oil Ring Width, in (mm) ............... 0.1875 (4.763)
Compression Ring Groove Clearance, in (mm) ............... 0.006 (0.152)
Compression Ring End Gap, in (mm) ............... 0.007 (0.178)
Oil Ring Groove Clearance, in (mm) ............... 0.006 (0.152)
Oil Ring End Gap, in (mm) ............... 0.007 (0.178)

Tightening Torque Specs

Cylinder Head Nuts, Nm (ft-lb) ............... 95-101 (70-75)
Connecting Rod Studs, Nm (ft-lb) ............... 54-61 (40-45)
Main Bearing Cap Screws, Nm (ft-lb) ............... 115-128 (85-95)
Camshaft Nut, Nm (ft-lb) ............... 81-108 (60-80)
Flywheel Nut, Nm (ft-lb) ............... 68-74 (50-55)
Cranking Nut, Nm (ft-lb) ............... 176-190 (130-140)
Oil Filter Base Cap Screws, Nm (ft-lb) ............... 41-47 (30-35)
Oil Filter Cover Cap Screws, Nm (ft-lb) ............... 115-128 (85-95)
Cam Gear Retaining Nut, Nm (ft-lb) ............... 95-108 (70-80)
Spark Plug, Nm (ft-lb) ............... 43 (32)