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John Deere STX46 Engine

John Deere STX46 Engine Specifications

Engine Model ............. Kohler Command CV13S
Engine Type ............. Gasoline, vertical shaft, four-cycle
Number of Cylinder ............. Single
Piston Displacement, cc (cu.in) ............. 398 (24.3)
Engine Bore, mm (in) ............. 87.0 (3.43)
Engine Stroke, mm (in) ............. 67.0 (2.64)
Engine Power, Hp (kW) ............. 13.0 (9.75)
Maximum Torque, Nm (ft-lb) ............. 28.7 (21.2)
Fast Idle Speed, rpm ............. 2500
Low Idle Speed, rpm ............. 1500
Compression Ratio ............. 8.5:1
Carburetor Type ............. Float Fixed Main Jet
Carburetor Model ............. Walbro or Nikki
Fuel Pump ............. Diaphragm Type Mechanical Pump
Fuel Filter ............. In-line
Governor ............. Centrifugal Mechanical Flyweight
Cooling System ............. Air Intake
Lubrication System Type ............. Full-Pressure
Air Cleaner ............. Replaceable, high density paper element
Electrical System Rating, Volts ............. 12
Alternator Charging Capacity, Amp ............. 15

John Deere STX46 Engine Maintenance Data

Engine Oil and Filter

Engine Oil Type (Summer) ............. SAE 10W-30
Engine Oil Type (Winter) ............. SAE 5W-20, 5W-30
Oil Classification ............. SG, SH, SJ or higher
Engine Oil Capacity (w/o filter), L (qts) ............. 1.6 (1.7)
Engine Oil Capacity (w/ filter), L (qts) ............. 1.9 (2.0)
Oil Filter Part Number ............. AM125424
Air Filter Part Number ............. M92359

Valve Adjustment

Intake Valve Clearance, mm (in) ............. 0.038-0.076 (0.0015-0.0030)
Exhaust Valve Clearance, mm (in) ............. 0.050-0.088 (0.0020-0.0035)
Valve Guide Reamer Size (0.25 mm Oversize), mm (in) ............. 7.298 (0.2873)
Intake Valve Minimum Lift, mm (in) ............. 8.96 (0.353)
Exhaust Valve Minimum Lift, mm (in) ............. 9.14 (0.360)

Carburetor Adjustments

Main Fuel ............. 2-1/2 turns
Idle Fuel ............. 3/4 to 1 full turn
Low Idle Speed, rpm ............. 1200±75
High Idle Speed, rpm ............. 3600±50

Ignition System

Ignition System Type ............. Dependable electronic magneto
Spark Plug ............. Champion RC12YC
Spark Plug Thread Size, mm (in) ............. 14 (0.55)
Spark Plug Reach, mm (in) ............. 19.1 (0.75)
Spark Plug Gap, mm (in) ............. 1.02 (0.040)
Ignition Module Air Gap, mm (in) ............. 0.200-0.300 (0.0078-0.0118)
Spark Plug Torque, Nm ............. 24.4-29.8

John Deere STX46 Engine Repair Specifications

Cylinder Block

Cylinder Bore I.D (Std) ............. 87.000-87.025 mm (3.4252-3.4262 in.)
Cylinder Bore I.D (Maximum Wear Limit) ............. 87.063 mm (3.4277 in.)
Cylinder Bore I.D (Max. Out of Round) ............. 0.12 mm (0.0047 in.)
Cylinder Bore I.D (Max. Taper) ............. 0.05 mm (0.0020 in.)
Connecting Rod Journal O.D (Std) ............. 38.958-30.970 mm (1.5338-1.5343 in.)
Connecting Rod Journal O.D (Maximum Wear Limit) ............. 38.94 mm (1.5328 in.)
Connecting Rod Journal (Max. Taper) ............. 0.012 mm (0.0005 in.)
Connecting Rod Journal (Max. Out of Round) ............. 0.025 mm (0.0010 in.)
Connecting Rod to Crankpin Clearance (Std) ............. 0.030-0.055 mm (0.0012-0.0022 in.)
Connecting Rod to Crankpin Clearance (Maximum Wear Limit) ............. 0.07 mm (0.0025 in.)
Connecting Rod to Crankpin Side Clearance ............. 0.18-0.41 mm (0.007-0.016 in.)
Connecting Rod to Piston Pin Clearance ............. 0.015-0.028 mm (0.0006-0.0011 in.)

Crankshaft

Crankshaft End Play (free) ............. 0.0575-0.4925 mm (0.0022-0.0193 in.)
Crankshaft End Play (thrust bearing with shims) ............. 0.050-0.530 mm (0.0020-0.0209 in.)
Crankshaft Bore in Crankcase I.D (Std) ............. 44.965-44.990 mm (1.7702-1.7712 in.)
Crankshaft Bore in Crankcase (Maximum Wear Limit) ............. 44.9758-45.0012 mm (1.7707-1.7717 in.)
Crankshaft Bore in Crankcase Running Clearance (Std) ............. 0.0300-0.0770 mm (0.0011-0.0030 in.)
Crankshaft Bore in Oil Pan I.D (Std) ............. 41.965-42.003 mm (1.6521-1.6536 in.)
Crankshaft Bore in Oil Pan I.D (Maximum Wear Limit) ............. 41.9760-42.0141 mm (1.6526-1.6541 in.)
Crankshaft Bore in Oil Pan Clearance (Std) ............. 0.0300-0.0880 mm (0.0011-0.0034 in.)
Flywheel End Main Bearing Journal O.D (Std) ............. 44.913-44.935 mm (1.7682-1.7691 in.)
Flywheel End Main Bearing Journal O.D (Maximum Wear Limit) ............. 44.84 mm (1.765 in.)
Flywheel End Main Bearing Journal (Max. Taper) ............. 0.022 mm (0.0009 in.)
Flywheel End Main Bearing Journal (Max. Out of Round) ............. 0.025 mm (0.0010 in.)
Oil Pan End Main Bearing Journal O.D (Std) ............. 41.915-41.935 mm (1.6502-1.6510 in.)
Oil Pan End Main Bearing Journal O.D (Maximum Wear Limit) ............. 41.86 mm (1.648 in.)
Oil Pan End Main Bearing Journal (Max. Taper) ............. 0.020 mm (0.0008 in.)
Oil Pan End Main Bearing Journal (Max. Out of Round) ............. 0.025 mm (0.0010 in.)
Crankshaft PTO End, Crank in Engine ............. 0.30 mm (0.012 in.)
Crankshaft Entire Crank, in V-Blocks ............. 0.10 mm (0.0039 in.)

Cylinder Head and Valves

Cylinder Head (Max. Out of Flatness) ............. 0.076 mm (0.003 in.)
Hydraulic Valve Lifter to Crankcase Clearance ............. 0.0124-0.0501 mm (0.0005-0.0020 in.)
Intake Valve Stem-to-Valve Guide Clearance ............. 0.038-0.076 mm (0.0015-0.0030 in.)
Exhaust Valve Stem-to-Valve Guide Clearance ............. 0.050-0.088 mm (0.0020-0.0035 in.)
Intake Valve Guide I.D (Std) ............. 7.038-7.058 mm (0.2771-0.2779 in.)
Intake Valve Guide I.D (Maximum Wear Limit) ............. 7.134 mm (0.2809 in.)
Exhaust Valve Guide I.D (Std) ............. 7.038-7.058 mm (0.2771-0.2779 in.)
Exhaust Valve Guide I.D (Maximum Wear Limit) ............. 7.159 mm (0.2819 in.)
Valve Guide Reamer Size (Std) ............. 7.048 mm (0.2775 in.)
Valve Guide Reamer Size (0.25 mm Oversize) ............. 7.298 mm (0.2873 in.)
Intake Valve Minimum Lift ............. 8.96 mm (0.353 in.)
Exhaust Valve Minimum Lift ............. 9.14 mm (0.360 in.)
Nominal Valve Seat Angle ............. 45 deg

Piston and Piston Rings

Piston to Piston Pin (selective fit) ............. 0.006-0.017 mm (0.0002-0.0007 in.)
Piston Pin Bore I.D (Std) ............. 19.006-19.012 mm (0.7483-0.7485 in.)
Piston Pin Bore I.D (Maximum Wear Limit) ............. 19.025 mm (0.7490 in.)
Piston Pin O.D (Std) ............. 18.995-19.000 mm (0.7478-0.7480 in.)
Piston Pin O.D (Maximum Wear Limit) ............. 18.994 mm (0.74779 in.)
Top Compression Ring to Groove Side Clearance ............. 0.034-0.100 mm (0.0013-0.0039 in.)
Middle Compression Ring to Groove Side Clearance ............. 0.040-0.080 mm (0.0016-0.0032 in.)
Oil Control Ring to Groove Side Clearance ............. 0.036-0.186 mm (0.0014-0.0073 in.)
Top Compression Ring End Gap Bore ............. 0.250-0.500 mm (0.010-0.020 in.)
Center Compression Ring End Gap Bore ............. 0.250-0.510 mm (0.0010-0.020 in.)
Oil Control Ring End Gap ............. 0.250-1.020 mm (0.010-0.040 in.)
Piston Thrust Face O.D (Std) ............. 86.941-86.959 mm (3.4229-3.4236 in.)
Piston Thrust Face O.D (Maximum Wear Limit) ............. 86.814 mm (3.4179 in.)
Piston Thrust Face to Cylinder Bore Running Clearance ............. 0.041-0.044 mm (0.0016-0.0017 in.)
Piston Pin End I.D (Std) ............. 19.015-19.023 mm (0.7486-0.7489 in.)
Piston Pin End I.D (Maximum Wear Limit) ............. 19.036 mm (0.7495 in.)

Camshaft

Camshaft End Play (free) ............. 0.088-0.393 mm (0.003-0.015 in.)
Camshaft End Play End Play (with shims) ............. 0.076-0.127 mm (0.003-0.005 in.)
Camshaft Clearance ............. 0.025-0.105 mm (0.0010-0.0041 in.)
Camshaft Bore I.D (Std) ............. 20.000-20.025 mm (0.7874-0.7884 in.)
Camshaft Bore I.D (Maximum Wear Limit) ............. 20.038 mm (0.7889 in.)
Camshaft Bearing Surface O.D (Std) ............. 19.962-19.975 mm (0.7859-0.7864 in.)
Camshaft Bearing Surface O.D (Maximum Wear Limit) ............. 19.959 mm (0.7858 in.)

John Deere STX46 Engine Tightening Torque Specs

Cylinder Head ............. 20-40.7 Nm (15-30 ft-lb.)
Connecting Rod ............. 11.3-22.7 Nm (100-200 in-lb.)
Fuel Bowl Retaining Screw ............. 5.1-6.2 Nm (45-55 in-lb.)
Starter Mounting Screw ............. 15.3 Nm (135 in-lb)
Fan ............. 9.9 Nm (88 in-lb)
Flywheel Retaining Screw ............. 66.4 Nm (49 ft-lb)
Fuel Pump ............. 9.0 Nm (80 in-lb)
Spark Plug ............. 24.4-29.8 Nm (18-22 ft-lb.)
Ignition Module ............. 6.2 Nm (55 in-lb.)
Muffler Retaining Nuts ............. 24.4 Nm (216 in-lb.)
Oil Filter ............. 10.4-12.7 Nm (90-110 in-lb.)
Oil Pan ............. 24.4 Nm (216 in-lb.)
Oil Pump Cover ............. 6.2 Nm (55 in-lb.)
Governor Control Lever ............. 9.9 Nm (88 in-lb.)
Valve Cover ............. 10.7 Nm (95 in-lb.)
Rocker Arm Screw ............. 11.3 Nm (100 in-lb.)
Rocker Arm Pivot Stud Torque ............. 11.3 Nm (100 in-lb.)

JOHN DEERE TRACTORS ATTACHMENTS
420	430	455	790	990
X300	X320	X330	X350	X475
X485	X500	X540	X570	X590
X700	X720	X738	X758	1023E
2025R	2210	2520	3025E	3032E
3038E	3038R	3039R	3046R	3203
3320	3520	4052R	4066R	4100
4105	4115	4200	4310	4320
4400	4410	4520	4600	4720

JD TRACTORS TROUBLESHOOTING
2640	3040	3310	3650	4100
5050D	5090R	5410	6105R	7200R
E130	L111	LA110	LT155	X300R