________________________________________________________________________________

Continental N62 Engine

The Continental N62 is a vintage 1.0-liter, 4-cylinder, naturally aspirated gasoline engine developed by Continental Motors. Widely utilized in mid-20th-century agricultural and small industrial equipment, it served as the primary powerplant for classic tractors such as the Allis-Chalmers Model G and the Massey-Harris Pony. Known for its utilitarian, low-compression design, this power unit is engineered for durability, high torque at low operating speeds, and straightforward field serviceability.

Valve Design: Vertical L-head configuration (flathead layout) where the valves are placed in the engine block parallel to the cylinders rather than in the cylinder head. Actuation: Driven by a block-mounted camshaft via mechanical lifters. Features: Features hardened valve seats to handle prolonged low-RPM operation without excessive recession. Total Displacement: 62 cubic inches (1.0 Liter). Bore Diameter: 2.385 inches (61 mm). Stroke Length: 3.500 inches (89 mm).

Induction Type: Carbureted, naturally aspirated induction layout. Carburetor Unit: Outfitted with a single-barrel, updraft Zenith 62 series carburetor (or equivalent small-venturi cast-iron tractor carburetor) optimized for constant fuel-air mixture stability under varying load conditions. Delivery: Gravity-fed or low-pressure mechanical fuel pump configuration drawing from a primary storage fuel tank, utilizing basic mechanical governors to regulate throttle valve positioning against engine load demands.

Lubrication System Type: Pressure-fed internal oiling system supplied by a block-driven oil pump. Oil Specification: Typically serviced with straight 30-weight detergent oil for standard warm-weather operation, or variable multi-viscosity oils depending on low ambient startup temperatures. Cooling System Type: Liquid-cooled, relying on a forced-circulation water jacket around the cylinders and cylinder head. System Design: Thermostatically managed flow through an external radiator to dissipate heat during constant-load industrial or agricultural tasks.

General Technical Data

Engine Specifications

Engine Model ............... Continental N62
Engine Type ............... 4-cycle inline 4-cylinder L-head flathead gasoline
Number of Cylinders ............... 4
Cylinder Arrangement ............... Vertical in-line
Engine Bore, in (mm) ............... 2.375 (60.325)
Engine Stroke, in (mm) ............... 3.500 (88.900)
Displacement, cu.in (L) ............... 62.0 (1.016)
Compression Ratio ............... 6.5:1
Rated Engine Power, hp (kW) ............... 10.0-11.6 (7.46-8.65)
Rated Engine Speed, rpm ............... 1800-2000
Peak Torque, lb-ft (Nm) ............... 37.0 (50.2) at 1600 rpm
Idle Speed, rpm ............... 450-500
Firing Order ............... 1-3-4-2
Number of Main Bearings ............... 3
Camshaft Drive Type ............... Helical gear train system
Crankshaft Rotation ............... Clockwise facing front pulley flange
Cylinder Block Material ............... Cast iron
Cylinder Head Material ............... Cast iron
Lubrication System Type ............... Full-pressure feed
Oil Pump Type ............... Gear-driven internal assembly
Oil Filter Type ............... Bypass system replaceable element
Cooling System Type ............... Thermo-siphon or liquid-cooled
Air Cleaner Type ............... Oil bath or vortex stage unit
Spark Plug Gap, in (mm) ............... 0.025 (0.635)
Breaker Point Gap, in (mm) ............... 0.020 (0.508)
Starting System ............... Electric starter motor or manual crank
Electrical System ............... 6V or 12V positive ground system

Fuel System

Fuel Type ............... Low-lead gasoline or regular unleaded petroleum
Carburetor Model ............... Zenith 62 series or Marvel-Schebler equivalent
Carburetor Type ............... Updraft single-barrel venturi arrangement
Choke Control Mechanism ............... Manual cable-operated butterfly disk
Fuel Feed Method ............... Gravity feed tank or low-pressure mechanical diaphragm pump
Fuel Pump Operating Pressure, psi (bar) ............... 1.5-3.0 (0.103-0.207)
Main Jet Size Identification ............... Zenith fixed calibration number 11
Idle Jet Size Identification ............... Adjustable needle valve packing needle
Float Setting Height, in (mm) ............... 0.281 (7.144)
Float Level Tolerance, in (mm) ............... 0.031 (0.794)
Manifold Induction Layout ............... Combined intake and exhaust cast single piece block mount
Governor Type ............... Mechanical flyweight variable speed
Fuel Strainer Type ............... Sediment bowl with fine mesh wire screen screen
Air Intake Diameter, in (mm) ............... 1.250 (31.750)

Dimensions and Weight

Overall Length, in (mm) ............... 22.1 (560)
Overall Width, in (mm) ............... 16.4 (415)
Overall Height, in (mm) ............... 24.5 (622)
Dry Weight, lbs (kg) ............... 210 (95)
Operating Weight, lbs (kg) ............... 255 (116)

Maintenance Data

Service Information

Compression Pressure, Normal, psi (bar) ............... 90-110 (6.205-7.584)
Minimum Compression Pressure, psi (bar) ............... 75 (5.171)
Oil Pressure at Rated Speed, psi (bar) ............... 30-40 (2.068-2.757)
Oil Pressure at Low Idle, psi (bar) ............... 8-12 (0.551-0.827)
Oil Temperature Optimal Range, F (C) ............... 160-190 (71-87)
Coolant Temperature Optimal Range, F (C) ............... 170-195 (76-90)
Intake Valve Lash (Cold), in (mm) ............... 0.012-0.015 (0.304-0.381)
Exhaust Valve Lash (Cold), in (mm) ............... 0.012-0.015 (0.304-0.381)

Engine Oil and Coolant

Engine Oil Type ............... SAE 20, SAE 20W, SAE 10W
API Service Classifications ................. DG or DM
Crankcase Oil Capacity, qt (L) ............... 4.0 (3.785)
Cooling System Capacity, qt (L) ............... 6.0-7.0 (5.678-6.624)
Air Cleaner Oil Bath Capacity, pt (L) ............... 0.5 (0.236)

Service Intervals

Change oil and filter ............... Every 100 hours
Replace/clean fuel filters ............... Every 250 hours
Inspect air cleaner ............... Every 25 hours
Change air filter ............... Every 150 hours
Change coolant ............... Every 500 hours
Valve-lash adjustment ............... Every 500 hours
Distributor point inspection ............... Every 100 hours
Spark plug replacement ............... Every 300 hours
Compression test evaluation ............... Every 300 hours
Belt tension verification ............... Every 100 hours
Check ignition timing ............... Every 200 hours

Service Specifications

Cylinder Bore Diameter, in (mm) ............... 2.375-2.376 (60.325-60.350)
Cylinder Bore Out of Round, Max, in (mm) ............... 0.001 (0.025)
Cylinder Bore Taper Max Allowance, in (mm) ............... 0.002 (0.050)
Main Bearing Radial Clearance, in (mm) ............... 0.0015-0.003 (0.038-0.076)
Crankshaft Main Journal Diameter (Front), in (mm) ............... 1.999-2.000 (50.774-50.800)
Crankshaft Main Journal Diameter (Center), in (mm) ............... 1.999-2.000 (50.774-50.800)
Crankshaft Main Journal Diameter (Rear), in (mm) ............... 1.999-2.000 (50.774-50.800)
Crankshaft End Play, in (mm) ............... 0.004-0.008 (0.101-0.203)
Crankshaft Journal Maximum Out of Round, in (mm) ............... 0.0005 (0.012
Crankshaft Journal Maximum Taper, in (mm) ............... 0.0005 (0.012)
Connecting Rod Journal Diameter, in (mm) ............... 1.499-1.500 (38.074-38.100)
Connecting Rod Bearing Radial Clearance, in (mm) ............... 0.001-0.0025 (0.025-0.063)
Connecting Rod Side Play, in (mm) ............... 0.005-0.010 (0.127-0.254)
Piston Skirt to Bore Clearance, in (mm) ............... 0.0025-0.0035 (0.063-0.088)
Piston Pin Bore Diameter in Piston, in (mm) ............... 0.5625-0.5628 (14.287-14.295)
Piston Pin Diameter, in (mm) ............... 0.5622-0.5624 (14.279-14.284)
Piston Pin Fit in Con Rod Bushing, in (mm) ............... 0.0003-0.0007 (0.007-0.017)
Piston Pin Fit in Piston Boss, in (mm) ............... 0.0001
Top Ring Width, in (mm) ............... 0.0937 (2.381)
Second Ring Width, in (mm) ............... 0.0937 (2.381)
Oil Ring Groove Width, in (mm) ............... 0.1875 (4.762)
Top Ring Groove Side Clearance, in (mm) ............... 0.002-0.0035 (0.050-0.088)
Second Ring Groove Side Clearance, in (mm) ............... 0.002-0.0035 (0.050-0.088)
Oil Ring Groove Side Clearance, in (mm) ............... 0.0015-0.003 (0.038-0.076)
Top Ring End Gap, in (mm) ............... 0.007-0.015 (0.177-0.381)
Second Ring End Gap, in (mm) ............... 0.007-0.015 (0.177-0.381)
Oil Ring End Gap, in (mm) ............... 0.007-0.015 (0.177-0.381)
Intake Valve Stem Diameter, in (mm) ............... 0.311-0.312 (7.899-7.924)
Exhaust Valve Stem Diameter, in (mm) ............... 0.310-0.311 (7.874-7.899)
Intake Valve Guide Inner Diameter, in (mm) ............... 0.313-0.314 (7.950-7.975)
Exhaust Valve Guide Inner Diameter, in (mm) ............... 0.313-0.314 (7.950-7.975)
Intake Valve Stem to Guide Clearance, in (mm) ............... 0.001-0.003 (0.025-0.076)
Exhaust Valve Stem to Guide Clearance, in (mm) ............... 0.002-0.004 (0.050-0.101)
Valve Face Seating Angle, deg ............... 45
Valve Seat Insert Angle, deg ............... 45
Valve Seat Width, in (mm) ............... 0.046-0.062 (1.168-1.574)
Valve Spring Free Length, in (mm) ............... 1.875 (47.625)
Valve Lifter Barrel Diameter, in (mm) ............... 0.561-0.562 (14.249-14.274)
Valve Lifter Guide Bore Block Diameter, in (mm) ............... 0.563-0.564 (14.299-14.325)
Valve Lifter Guide Clearance, in (mm) ............... 0.001-0.003 (0.025-0.076)
Camshaft Journal Diameter (Front), in (mm) ............... 1.375-1.376 (34.925-34.950)
Camshaft Journal Diameter (Center), in (mm) ............... 1.312-1.313 (33.324-33.350)
Camshaft Journal Diameter (Rear), in (mm) ............... 1.250-1.251 (31.750-31.775)
Camshaft Bearing Radial Clearance, in (mm) ............... 0.0015-0.0035 (0.038-0.088)
Camshaft End Play, in (mm) ............... 0.003-0.006 (0.076-0.152)

Tightening Torques

Cylinder Head Stud Bolts (5/16-18), lb-ft (Nm) ............... 35.0-45.0 (47.45-61.01)
Connecting Rod Cap Nut (3/8-24), lb-ft (Nm) ............... 20.0-25.0 (27.11-33.89)
Main Bearing Cap Stud Bolts (7/16-14), lb-ft (Nm) ............... 35.0-40.0 (47.45-54.23)
Flywheel Assembly Attaching Bolts (3/8-24), lb-ft (Nm) ............... 35.0-40.0 (47.45-54.23)
Manifold Assembly Intake Exhaust Stud Nuts, lb-ft (Nm) ............... 15.0-18.0 (20.33-24.40)
Oil Pan Sump Enclosure Drain Plug Bolt, lb-ft (Nm) ............... 20.0-25.0 (27.11-33.89)
Oil Pan Perimeter Base Attaching Screws, lb-ft (Nm) ............... 7.0-9.0 (9.49-12.20)
Timing Gear Cover Backing Flange Screws, lb-ft (Nm) ............... 10.0-13.0 (13.55-17.62)
Front Crankshaft Pulley Center Hub Nut, lb-ft (Nm) ............... 55.0-65.0 (74.56-88.12)
Camshaft Retaining Thrust Plate Screws, lb-ft (Nm) ............... 8.0-11.0 (10.84-14.91)
Spark Plug Body Seals Into Cylinder Head, lb-ft (Nm) ............... 25.0-30.0 (33.89-40.67)
Distributor Base Mounting Locking Clamp Bolt, lb-ft (Nm) ............... 12.0-15.0 (16.27-20.33)
Governor Housing Assembly Flange Bolts, lb-ft (Nm) ............... 14.0-17.0 (18.98-23.04)
Water Outlet Fitting Pipe Elbow Studs, lb-ft (Nm) ............... 12.0-15.0 (16.27-20.33)
Valve Inspection Cover Plates Thumbscrews, lb-ft (Nm) ............... 4.0-6.0 (5.42-8.13)
Oil Pump Internal Housing Attaching Screws, lb-ft (Nm) ............... 11.0-14.0 (14.91-18.98)
Clutch Pressure Plate Housing To Flywheel, lb-ft (Nm) ............... 17.0-20.0 (23.04-27.11)
Crankcase Breather Tube Bracket Clamp Screw, lb-ft (Nm) ............... 6.0-8.0 (8.13-10.84)
Starter Motor Mounting Flange Structural Bolts, lb-ft (Nm) ............... 25.0-30.0 (33.89-40.67)
Generator Support Bracket Assembly Arm Bolts, lb-ft (Nm) ............... 18.0-22.0 (24.40-29.82)
Fuel Pump Dia Flange Mounting Stud Nuts, lb-ft (Nm) ............... 12.0-14.0 (16.27-18.98)
Carburetor Base Induction Flange Stud Nuts, lb-ft (Nm) ............... 14.0-17.0 (18.98-23.04)
Oil Screen Support Intake Flange Fasteners, lb-ft (Nm) ............... 8.0-10.0 (10.84-13.55)
Flywheel Housing Adaptor To Engine Block, lb-ft (Nm) ............... 28.0-32.0 (37.96-43.38)
Cylinder Block Oil Gallery Recessed Plugs, lb-ft (Nm) ............... 15.0-20.0 (20.33-27.11)

________________________________________________________________________________________

• Continental Engines Specs
  
• Continental F209 Specs
  
• Continental G176 Specs
  
• Continental G193 Specs
  
• Continental M330 Specs
  
• Continental TM20 Specs
  
• Continental TM27 Specs
  

________________________________________________________________________________

________________________________________________________________________________________

_______________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________