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Cub Cadet LT1042 Engine

Cub Cadet LT1042 Engine Specifications

Engine Model - Kohler Courage SV590
Engine Type - Gasoline, single-cylinder, vertical shaft air-cooled
Number of Cylinders - 1
Displacement, cc (cu.in) - 597 (36.4)
Engine Bore, mm (in) - 94.0 (3.70)
Engine Stroke, mm (in) - 86.0 (3.38)
Rated Engine Power, hp (kW) - 19.0 (14.1)
Rated Engine Speed, rpm - 3600
Maximum Torque, Nm (ft-lbs) - 42.3 (31.2)
Torque Speed, rpm - 2600
Compression - 8.5:1
Carburetor Model - Walbro
Carburetor Type - Fixed main jet
Fuel Pump - Pulse type
Fuel Filter - In-line
Governor - Mechanical
Lubrication - Full pressure
Oil filter - Full-flow type
Air Cleaner - Replaceable, paper element
Oil Capacity, L (qts) - 1.9 (2.0)
Electrical System Rating, Volts - 12
Starter Type - Electric
Battery Rating - 12V, 400 CCA

Cub Cadet LT1042 Engine Maintenance Data

Valve Adjustment

Intake Valve Clearance (Cold), mm (in) - 0.038-0.076 (0.0015-0.0030)
Exhaust Valve Clearance (Cold), mm (in) - 0.050-0.088 (0.0020-0.0035)
Intake Valve Minimum Lift, mm (in) - 8.9 (0.350)
Exhaust Valve Minimum Lift, mm (in) - 8.9 (0.350)

Engine Oil and Filters

Engine Oil Type (Summer) - SAE 10W-30
Engine Oil Type (Winter) - SAE 5W-20, 5W-30
Oil Classification - SG, SH, SJ or higher
Oil Capacity (with Filter), L (qts) - 1.5 (1.6)
Oil Filter Part Number - 28-050-01-S
Air Filter Part Number - 12-050-01-S

Carburetor Adjustment

Main Fuel - Not adjustable
Idle Fuel - Adjust by needle and spring with limiter cap
Low Idle Speed, rpm - 1500±75
High Idle Speed, rpm - 3600±50

Ignition System

Spark Plug Type - Champion RC12YC or QC12YC
Spark Plug Gap, mm (in) - 0.76 (0.030)
Module Air Gap, mm (in) - 0.203-0.305 (0.008-0.012)
Thread Size, mm (in) - 14 (0.55)
Reach, mm (in) - 19.1 (0.75)
Spark Plug Torque, Nm (ft-lbs) - 24-30 (18-22)

Cub Cadet LT1042 Engine Service Specifications

Cylinder Block

Cylinder Bore I.D (Std), mm (in) - 94.010-94.035 (3.701-3.702)
Cylinder Bore I.D (Wear Limit), mm (in) - 94.073 (3.704)
Cylinder Bore (Max. Taper), mm (in) - 0.05 (0.002)
Cylinder Bore (Max. Out of Round), mm (in) - 0.12 (0.0047)
Cylinder Head (Max. Out-of-Flatness), mm (in) - 0.8 (0.003)
Cam Gears End Play, mm (in) - 0.5-1.5 (0.019-0.059)
Cam Gears Running Side Clearance, mm (in) - 0.02-0.13 (0.001-0.005)
Cam Gear-to-Camshaft Running Assembly, mm (in) - 0.02-0.10 (0.001-0.004)
Connecting Rod-to-Crankpin Clearance, mm (in) - 0.03-0.055 (0.0012-0.0022)
Connecting Rod-to-Crankpin Side Clearance, mm (in) - 0.25-0.59 (0.0098-0.0232)
Connecting Rod-to-Piston Pin Clearance, mm (in) - 0.015-0.028 (0.0006-0.0011)

Valves and Valve Lifters

Valve Lash, mm (in) - 0.076 (0.003)
Intake Valve Minimum Lift, mm (in) - 8.9 (0.350)
Exhaust Valve Minimum Lift, mm (in) - 8.9 (0.350)
Nominal Valve Seat Angle, deg - 45
Intake Valve Stem-to-Valve Guide Clearance, mm (in) - 0.038-0.076 (0.0015-0.003)
Exhaust Valve Stem-to-Valve Guide Clearance, mm (in) - 0.050-0.88 (0.0020-0.0035)
Intake Valve Guide I.D, mm (in) - 6.038-6.058 (0.2377-0.2385)
Intake Valve Stem Diameter, mm (in) - 5.982-6.0 (0.2355-0.2362)
Exhaust Valve Guide I.D, mm (in) - 6.038-6.058 (0.2377-0.2385)
Exhaust Valve Stem Diameter, mm (in) - 5.970-5.988 (0.235-0.2357)

Crankshaft

Crankshaft End Play (free), mm (in) - 0.225-1.025 (0.0089-0.040)
Crankshaft Bore in Crankcase I.D, mm (in) - 41.965-41.990 (1.6521-1.6531)
Crankshaft Bore in Closure Plate I.D, mm (in) - 44.965-44.990 (1.7703-1.7713)
Flywheel End Main Bearing Journal O.D, mm (in) - 44.913-44.935 (1.7682-1.7691)
Flywheel End Main Bearing Journal (Max. Taper), mm (in) - 0.0220 (0.0009)
Flywheel End Main Bearing Journal (Max. Out of Round), mm (in) - 0.025 (0.001)
PTO End Main Bearing Journal O.D, mm (in) - 41.913-41.935 (1.6501-1.6510)
PTO End Main Bearing Journal (Max. Taper), mm (in) - 0.020 (0.0008)
PTO End Main Bearing Journal (Max. Out of Round), mm (in) - 0.025 (0.001)
Crankshaft Bore in Closure Plate Clearance, mm (in) - 0.03-0.077 (0.0012-0.003)
Crankshaft Bore in Crankcase Clearance, mm (in) - 0.03-0.077 (0.0012-0.003)
Connecting Rod Journal O.D, mm (in) - 40.982-41.000 (1.6134-1.6141)
Connecting Rod Journal (Max. Taper), mm (in) - 0.012 (0.0005)
Connecting Rod Journal (Max. Out of Round), mm (in) - 0.025 (0.001)
Crankshaft T.I.R (PTO End, Crankshaft in Engine), mm (in) - 0.15 (0.0059)
Crankshaft T.I.R (Entire Crankshaft, in V-Blocks), mm (in) - 0.10 (0.0039)
Crankshaft Eccentrics O.D, mm (in) - 66.940-66.970 (2.6354-2.6366)
Balance Weight Bearing Surface I.D, mm (in) - 67.011-67.086 (2.6382-2.6412)
Guide Pin O.D, mm (in) - 11.950-11.975 (0.4705-0.4715)
Guide Shoe Width, mm (in) - 17.85-17.90 (0.703-0.705)
Guide Shoe Hole I.D, mm (in) - 12.000-12.025 (0.4724-0.4734)

Piston and Piston Rings

Piston Pin Bore I.D, mm (in) - 22.006-22.012 (0.8685-0.8666)
Piston Pin O.D, mm (in) - 21.995-22.0 (0.8659-0.8661)
Piston Pin End I.D, mm (in) - 22.015-22.023 (0.8667-0.8670)
Top Compression Ring-to-Groove Side Clearance, mm (in) - 0.04 (0.0016)
Middle Compression Ring-to-Groove Side Clearance, mm (in) - 0.04 (0.0016)
Top Compression Ring End Gap, mm (in) - 0.15-0.40 (0.006-0.016)
Middle Compression Ring End Gap, mm (in) - 0.30-0.55 (0.012-0.022)
Piston Thrust Face O.D, mm (in) - 93.928-93.942 (3.6980-3.6985)
Piston Thrust Face-to-Cylinder Bore Clearance, mm (in) - 0.0875 (0.0034)

Cub Cadet LT1042 Engine Tightening Torque Specs

Cylinder Head - 20.5-41.0 Nm (15-30 ft-lb)
Rocker Arm Pivot Stud - 13.5 Nm (10 ft-lb)
Rocker Arm Adjustment Nut Set Screw - 5.5 Nm (4.2 ft-lb)
Flywheel Retaining Screw - 66.5 Nm (49 ft-lb)
Connecting Rod Cap - 11.5 Nm (8.5 ft-lb)
Cam Lever - 7.5 Nm (5.4 ft-lb)
Oil Drain Plug - 14.0 Nm (10.4 ft-lb)
Fuel Bowl Retaining Screw Torque - 5.1-6.2 Nm (3.8-4.6 ft-lb)
Balance Weight Screw - 10.0 Nm (7.5 ft-lb)
Air Cleaner Base Mounting Screw - 8.0 Nm (5.8 ft-lb)
Electric Starter Mounting Nut - 3.6 Nm (2.7 ft-lb)
Ignition Module - 6.0 Nm (4.5 ft-lb)
Muffler Retaining Nuts - 24.4 Nm (18 ft-lb)
Oil Filter - 10-13 Nm (7.5-10.1 ft-lb)
Oil Pump Mounting Screw - 4.0 Nm (2.9 ft-lb)
Rectifier-Regulator Mounting Screw - 6.0 Nm (4.5 ft-lb)
Speed Control Bracket Assembly - 11.0 Nm (8.2 ft-lb)
Governor Control Lever - 7.0-8.5 Nm (5.2-6.3 ft-lb)

CUB CADET TRACTORS TROUBLESHOOTING
1050	1863	2166	2182	2186
3184	3205	GT1554	GT2550	GTX2100
LT1040	LT1042	LT1045	LT1046	LT1050
LT2180	LTX1040	LTX1042	LTX1045	LTX1046
LTX1050	SLTX1054	XT1 LT42	XT1 LT46	XT3 GSX