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Kohler K361 Engine

General Technical Data

Kohler K361 Engine Specifications

Engine Model ............... Kohler K361 (K361QS)
Engine Type ............... 4-Cycle, single cylinder horizontal shaft gasoline
Number of Cylinders ............... 1
Displacement, L (cu in) ............... 0.588 (35.9)
Engine Bore, mm (in) ............... 95.0 (3.75)
Engine Stroke, mm (in) ............... 83.0 (3.25)
Maximum Horse Power, hp (kW) ............... 18.0 (13.5)
Rated Engine Speed, rpm ............... 3600
Fuel System ............... Carburetor
Carburetor Type ............... Side-draft adjustable jet
Fuel Pump ............... Mechanical type
Governer ............... Centrifugal flyweight mechanical type
Lubrication System ............... Splash type
Cooling System ............... Forced-air
Ignition System ............... Battery type
Starter Type ............... Recoil or electric

Kohler K361 Maintenance Data

Engine Oil

Engine Oil Type (Summer) ............... SAE 30W
Engine Oil Type (Winter) ............... SAE 5W-20, 5W-30
Oil Classification ............... API SF, SG
Oil Capacity (K361QS), L (qts) ............... 1.90 (2.00)
Oil Capacity (K341A Special Oil Pan), L (qts) ............... 1.4 (1.5)

Valves

Valve Clearance Intake (Cold) ............... 0.005 (0.13)
Valve Clearance Exhaust (Cold) ............... 0.005 (0.13)
Tappet in Guide ............... 0.0005-0.0.024 (0.013-0.061)
Valve Stem in Guide (Exhaust) ............... 0.0029-0.0056 (0.074-0.142)
Valve Stem in Guide (Intake) ............... 0.001-0.0027 (0.025-0.069)
Guide in Head (Interference Fit) ............... 0.0015-0.003 (0.038-0.076)

Ignition System

Spark Plug Type ............... Champion RH10
Spark Plug Size, mm (in) ............... 14.0 (0.553)
Spark Plug Gap, mm (in) ............... 0.89 (0.035)
Breaker Point Gap (Nominal), mm (in) ............... 0.508 (0.020)
Ignition Timing, degrees ............... 20 BTDC

Kohler K361 Service Intervals

Change Engine Oil ............... Every 25 hours
Clean Air Cleaner Paper Element ............... Every 100 hours
Service or Replace Spark Plug ............... Every 100 hours
Cylinder Head Service ............... Every 500 hours
Valve Clearance Checking ............... Every 500 hours

Carburetor Adjustment

Main Fuel ............... 2-1/2 turns
Idle Fuel ............... 3/4 to 1 full turn
Idle Speed, rpm ............... 1800

Kohler K361 Service Data

Cylinder Block

Cylinder Bore (New Diameter) ............... 3.750 (95.25)
Cylinder Bore (Maximum Wear Diameter) ............... 3.753 (95.33)
Cylinder Bore (Maximum Taper) ............... 0.0015 (0.038)
Cylinder Bore (Maximum Out of Round) ............... 0.005 (0.127)
Crankshaft Crankpin (New Diameter) ............... 1.500 (38.1)
Crankshaft Crankpin (Maximum Out of Round) ............... 0.0005 (0.013)
Crankshaft Crankpin (Maximum Taper) ............... 0.001 (0.025)
Connecting Rod Big End (Maximum Diameter) ............... 1.5025 (38.164)
Piston Thrust Face (Maximum Wear Diameter) ............... 3.7425 (95.060)
Valve to Guide (Maximum Clearance) ............... 0.0065 (0.165)
Bearing Plate to Cylinder Block (Pilot Clear) ............... 0.001-0.005 (0.025-0.127)
Ball Bearing to Cylinder Block (Interference Fit) ............... 0.0006-0.0022 (0.015-0.056)
Ball Bearing to Bearing Plate (Interference Fit) ............... 0.0012-0.0028 (0.030-0.071)
Ball Bearing to Crankshaft ............... 0.0004-0.0005 (0.010-0.013)
Balance Gear End Play ............... 0.002-0.010 (0.051-0.254)
Crankshaft Free End Play ............... 0.003-0.020 (0.076-0.508)
Crankshaft-Connecting Rod Journal Size ............... 1.5000-1.4995 (38.100-38.087)
Connecting Rod to Crankpin Running Clearance ............... 0.001-0.002 (0,025-0.051)
Connecting Rod Side Play on Crankpin ............... 0.007-0.0175 (0.178-0.444)
Connecting Rod to Wrist Pin ............... 0.0003-0.0008 (0.008-0.020)
Camshaft Pin to Camshaft ............... 0.001-0.0035 (0.025-0.089)
Camshaft Pin to Block (Bearing Plate End) ............... 0.0005-0.002 (0.013-0.051)
Camshaft Pin to Block (PTO) ............... 0.0015-0.003 (0.038-0.076)
Camsaft End Play ............... 0.005-0.010 (0.127-0.254)

Piston and Piston Rings

Piston to Cylinder Bore Clearance (Thrust Face/Bottom of Skirt) ............... 0.0030-0.0045 (0.076-0.114)
Piston to Cylinder Bore Clearance (Thrust Face/Тор of Skirt) ............... 0.007-0.0095 (0.178-0.241)
Ring Side Clearance (Top Ring) ............... 0.002-0.004 (0.051-0.102)
Ring Side Clearance (Middle Ring) ............... 0.002-0.004 (0.051-0.102)
Ring Side Clearance (Oil Ring) ............... 0.001-0.003 (0.025-0.076)
Ring End Gap ............... 0.010-0.020 (0.254-0.508)

Kohler K361 Tightening Torque Specs

Cylinder Head Bolts, Nm (ft-lbs) ............... 41-48 (30-35)
Flywheel, Nm (ft-lbs) ............... 81-95 (60-70)
Spark Plug, Nm (ft-lbs) ............... 25-30 (18-22)
Connecting Rod, Nm (ft-lbs) ............... 34 (25.1)
Governor Bushing, Nm (ft-lbs) ............... 15-18 (11.1-13.3)
Fuel Pump Screws, Nm (ft-lbs) ............... 8.1 (5.9)