GMC gasoline V6 90° Generation I 4.3L (262 CID) Vortec 4300 V6 LU3 (2002–2003)
GMC gasoline V6 90° Generation I 4.3L (262 CID) Vortec 4300 V6 LU3 (2002–2003) is an 262 in³ (4.29 L) internal combustion reciprocating V6 engine. It has bore/stroke ratio of 4.012 in × 3.48 in (10.19 cm × 8.84 cm), and uses 9.2:1 compression. This engine was rated 200 hp (149.14 kW) at 4600 rpm and 260 lbf⋅ft (352.51 N⋅m) of torque at 2800 rpm. It was used in Chevrolet and GMC cars.
Parameter | Output |
---|---|
Power Rating | 200 hp (149.14 kW) at 4600 RPM |
Torque Rating | 260 lbf⋅ft at 2800 RPM |
Parameter | Value |
---|---|
Type | Internal Combustion Reciprocating |
Fuel Type | Gasoline or Natural Gas (CNG) |
Cylinder Configuration | V6 |
Engine Displacement | 262 in³ |
Bore | 4.012 in |
Stroke | 3.48 in |
Compression Ratio | 9.2:1 |
Firing Order | 1-6-5-4-3-2 |
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Parameter | Value |
---|---|
Block Material | Cast iron |
Crankshaft Material | Cast nodular iron |
Piston Material | Cast alloy aluminum |
Connecting Rod Material | Forged steel |
Parameter | Value |
---|---|
Spark Plugs | R41-932 |
Spark Plug Gap | 0.06 in |
Wires Resistance (nominal) | 1000 ohms per foot |
Parameter | Value |
---|---|
Head Material | Cast iron |
Valvetrain Type | OHV |
Valves per Cylinder | 2 |
Camshaft Material | Steel |
Parameter | Value |
---|---|
Air Intake Method | Naturally Aspirated |
Parameter | Value |
---|---|
Injection Type | Multi Point |
Injection Info | Direct composite distributor, platinum-tipped spark plugs, lowresistan ce spark plug wires |
Parameter | Value |
---|---|
Oil Pump Pressure | 24 Psi at 4000 RPM |
Parameter | Value |
---|---|
Water Pump | Centrifugal vane impeller type pump |
Condition | Value |
---|
expand_moreGeneral specifications
expand_moreBalance shaft
Rear bearing journal clearance | 0.002–0.0035 in |
Rear bearing journal diameter | 1.499–1.5 in |
expand_moreCamshaft
End Play | 0.001–0.009 in |
Journal diameter | 1.87–1.87 in |
Journal diameter out-of-round | 0.00098 in |
Max |
expand_moreLobe lift
Exhaust | 0.28–0.29 in |
Intake | 0.27–0.28 in |
Runout | 0.0026 in |
expand_moreConnecting rod
expand_moreConnecting rod bearing clearance
Production | 0.0015–0.0031 in |
Service | 0.00098–0.0025 in |
Connecting rod journal diameter | 2.249–2.25 in |
expand_moreConnecting rod journal out-of-round
Production | 0.00028 in |
Max | |
Service | 0.00098 in |
Max |
expand_moreConnecting rod journal taper
Production | 0.0002 in |
Max | |
Service | 0.00098 in |
Max |
Connecting rod side clearance | 0.0059–0.017 in |
expand_moreCrankshaft
expand_moreCrankshaft bearing clearance
expand_moreJournal 1
Production | 0.00079–0.02 in |
Service | 0.001–0.002 in |
expand_moreJournal 2, 3, and 4
Production | 0.0011–0.0023 in |
Service | 0.00098–0.0025 in |
Crankshaft end play | 0.002–0.0079 in |
expand_moreCrankshaft journal diameter
Journal 1 | 2.449–2.449 in |
Journal 2 and 3 | 2.448–2.449 in |
Journal 4 | 2.448–2.449 in |
expand_moreCrankshaft journal out-of-round
Production | 0.0002 in |
Max | |
Service | 0.00098 in |
Max |
expand_moreCrankshaft journal taper
Production | 0.00028 in |
Max |
Crankshaft runout | 0.00098 in |
Max |
expand_moreCylinder bore
Diameter | 4.001–4.002 in |
expand_moreOut-of-round
Production | 0.0005 in |
Max | |
Service | 0.002 in |
Max |
expand_moreTaper
Service | 0.00098 in |
Max |
expand_moreProduction
Relief Side | 0.00098 in |
Max | |
Thrust side | 0.00047 in |
Max |
expand_moreCylinder head
Surface flatness | 0.0039 in |
Max |
expand_moreExhaust manifold
expand_moreSurface flatness
Flange to flange | 0.0098 in |
Max | |
Individual flange | 0.002 in |
Max |
expand_moreIntake manifold
Surface flatness | 0.0039 in |
Max |
expand_moreOil pan
Oil pan alignment at the rear of the engine block | 0.012 in |
Max |
expand_morePiston
expand_morePiston bore clearance
Production | 0.00071–0.0024 in |
Service | 0.003 in |
Max |
expand_morePiston pin
expand_moreClearance in piston
Production | 0.00051–0.00091 in |
Service | 0.00098 in |
Max |
Diameter | 0.927–0.927 in |
Fit in connecting rod | 0.00047–0.0019 in |
Interference |
expand_morePiston rings (end gap measured in cylinder bore)
expand_morePiston compression ring gap
expand_moreTop Groove
Production | 0.0098–0.016 in |
Service | 0.0098–0.02 in |
expand_moreSecond groove
Production | 0.015–0.023 in |
Service | 0.015–0.031 in |
expand_morePiston compression ring groove clearance
expand_moreProduction
Top Groove | 0.0012–0.0028 in |
Second groove | 0.0016–0.0031 in |
Service | 0.0012–0.0033 in |
expand_morePiston oil ring gap
Production | 0.0098–0.03 in |
Service | 0.0002–0.0035 in |
expand_morePiston oil ring groove clearance
Production | 0.0018–0.0077 in |
Service | 0.0018–0.0079 in |
expand_moreValve system
Valve face angle | 45° |
Valve head edge margin | 0.031 in |
Min | |
Valve lash | Net Lash-No Adjustment |
expand_moreValve lift
Exhaust | 0.428 in |
Intake | 0.414 in |
Valve lifter | Hydraulic Roller Type |
Valve rocker arm | Roller Pivot Type |
Valve rocker arm ratio | 1.5:1 |
Valve seat angle | 46° |
Valve seat run-out | 0.002 in |
Max |
expand_moreValve seat width
Exhaust | 0.065–0.098 in |
Intake | 0.04–0.065 in |
Valve spring free length | 2.02 in |
expand_moreValve spring installed height
Exhaust | 1.69–1.71 in |
Intake | 1.69–1.71 in |
expand_moreValve spring pressure
Closed | 1.11–1.23 ft |
Open | 2.73–2.96 ft |
expand_moreValve stem clearance
expand_moreIntake
Production | 0.00098–0.0027 in |
Service | 0.00098–0.0037 in |
expand_moreExhaust
Production | 0.00098–0.0027 in |
Service | 0.00098–0.0037 in |
expand_moreValve stem oil seal installed height
Measured from the top of the large diameter valve guide bevel to the bottom of the valve stem oil seal | 0.039–0.079 in |
expand_moreElectric engine
expand_moreBattery
expand_moreBase
Cold Cranking Amperage (CCA) | 600 A |
Reserve capacity rating | 115 Minutes |
Replacement Battery Number | 78-6YR |
expand_moreDual (optional)
Reserve capacity rating | 115 Minutes |
Replacement Battery Number | 78-7YR |
Cold Cranking Amperage (CCA) | 770 A |
Starter motor | PG-260G |
expand_moreGenerator
expand_moreBase
Generator model | Delphi AD230 |
Rated Output | 102 A |
Load test output | 71 A |
expand_moreOptional
expand_moreDual
Generator model | Delphi AD244 |
Rated Output | 130 A |
Load test output | 91 A |
expand_moreBosch Generator
Generator model | Bosch 15755900 |
Rated Output | 130 A |
Load test output | 91 A |
Condition | Value |
---|
expand_moreGeneral specifications
Accelerator cable bracket nuts for stud screws | 8.85 lbf⋅ft |
Accelerator cable bracket nut on throttle body | 6.64 lbf⋅ft |
Accelerator cable bracket stud bolts on intake manifold | 4.43 lbf⋅ft |
Accelerator cable bracket stud bolts on throttle body | 8.85 lbf⋅ft |
expand_moreBalance shaft driven gear screws
First stage | 14.75 lbf⋅ft |
Final stage | 35° |
Balance shaft retainer screws | 8.85 lbf⋅ft |
Battery wiring harness bracket bolt on the oil pan | 8.85 lbf⋅ft |
Battery negative wiring harness bolt on the engine block | 18.44 lbf⋅ft |
Battery positive wiring harness junction block bracket screws | 18.44 lbf⋅ft |
Camshaft retainer screws | 8.85 lbf⋅ft |
Camshaft sprocket screws | 18.44 lbf⋅ft |
Crankshaft balancer screws | 70.07 lbf⋅ft |
Crankshaft pulley screws | 42.78 lbf⋅ft |
Crankshaft rear oil seal housing bolt and nuts | 8.85 lbf⋅ft |
expand_moreCylinder head screws
expand_morePreferred method
First pass (all screws) | 22.13 lbf⋅ft |
Long bolts final pass in sequence | 75° |
Medium bolts final pass (in sequence) | 65° |
Short Bolts Final Pass in Sequence | 55° |
Drive belt idler screws | 36.88 lbf⋅ft |
Drive belt tensioner screws | 36.88 lbf⋅ft |
EGR valve inlet pipe clamp screws | 18.44 lbf⋅ft |
EGR valve inlet pipe nut at the intake manifold | 18.44 lbf⋅ft |
EGR valve inlet pipe nut at the exhaust manifold | 22.13 lbf⋅ft |
Engine coolant temperature sensor (ECT) | 14.75 lbf⋅ft |
Engine flywheel screws | 73.76 lbf⋅ft |
Engine front cover screws | 8.85 lbf⋅ft |
Engine lift bracket screws | 11.06 lbf⋅ft |
Use Special Tool J 41427 | |
Engine mount bracket screws | 36.88 lbf⋅ft |
Engine mount bracket screws to the engine block | 36.88 lbf⋅ft |
Engine mount bracket through-screws | 55.32 lbf⋅ft |
Engine mount frame lateral screws | 47.94 lbf⋅ft |
Engine oil level sensor | 9.59 lbf⋅ft |
Junction block bracket screws | 6.64 lbf⋅ft |
Engine wiring harness bracket bolt on the generator and the tensioner bracket | 18.44 lbf⋅ft |
Engine wiring harness bracket bolt on the rear right side of the cylinder head | 18.44 lbf⋅ft |
Engine wiring harness bracket nut on the evaporator canister purge solenoid valve | 6.64 lbf⋅ft |
Engine wiring harness bracket nut on the intake manifold | 8.85 lbf⋅ft |
Frame cross bar screws | 73.76 lbf⋅ft |
Generator and belt tensioner bracket screw on the engine block | 30.24 lbf⋅ft |
Generator and belt tensioner bracket stud screws on the engine block | 14.75 lbf⋅ft |
Generator and belt tensioner bracket stud screws | 30.24 lbf⋅ft |
Ground wire bolt on the left rear side of the cylinder head | 11.8 lbf⋅ft |
Ground wire nut on the right rear side of the cylinder head | 11.8 lbf⋅ft |
Heater hose bracket bolt on the generator | 18.44 lbf⋅ft |
expand_moreLower intake manifold screws
First stage (in sequence) | 2.21 lbf⋅ft |
Second stage (in sequence) | 8.85 lbf⋅ft |
Final stage | 11.06 lbf⋅ft |
Oil cooler pipe bracket to the oil pan screws | 8.85 lbf⋅ft |
Oil filter fitting | 40.57 lbf⋅ft |
Oil level indicator tube screws | 8.85 lbf⋅ft |
Oil pan screws and nuts | 18.44 lbf⋅ft |
Oil pan drain plug | 18.44 lbf⋅ft |
Oil pan skid plate screws | 14.75 lbf⋅ft |
Oil pump bolt to the rear crankshaft bearing cap | 66.38 lbf⋅ft |
Power steering pump bracket bolt to engine | 30.24 lbf⋅ft |
Power steering pump bracket stud bolts to engine | 14.75 lbf⋅ft |
Power steering pump bracket stud bolt nuts | 30.24 lbf⋅ft |
Power steering pump screws | 36.88 lbf⋅ft |
expand_morePower steering pump nut to engine
Rear bracket to engine | 30.24 lbf⋅ft |
Power steering pump rear bracket nuts | 36.88 lbf⋅ft |
Secondary air injection (AIR) check valve pipe bracket bolt to exhaust manifold | 7.38 lbf⋅ft |
Secondary air injection (AIR) check valve pipe stud bolt nuts | 18.44 lbf⋅ft |
expand_moreSpark Plug
Initial installation new cylinder head | 22.13 lbf⋅ft |
All subsequent installations | 11.06 lbf⋅ft |
Spark plug wire support screws | 8.85 lbf⋅ft |
Starter wiring harness transmission cooler pipe bracket to oil pan screws | 6.64 lbf⋅ft |
Transmission to oil pan screws | 34.67 lbf⋅ft |
Transmission cover screws | 8.85 lbf⋅ft |
expand_moreUpper intake manifold stud screws
First stage | 3.69 lbf⋅ft |
Final stage | 6.64 lbf⋅ft |
Valve lifter push rod guide screws | 11.8 lbf⋅ft |
Valve rocker arm screws | 22.13 lbf⋅ft |
Valve rocker arm cover screws | 8.85 lbf⋅ft |
expand_moreEngine cooling
Air cleaner outlet ducts nuts | 2.21 lbf⋅ft |
Coolant heater screws | 1.48 lbf⋅ft |
Coolant heater cord screws | 5.9 lbf⋅ft |
Engine block coolant drain plug | 14.75 lbf⋅ft |
Fan clutch screws | 16.96 lbf⋅ft |
Fan clutch nuts | 41.3 lbf⋅ft |
Fan shroud screws | 6.64 lbf⋅ft |
Fan and water pump pulley screws | 18.44 lbf⋅ft |
Radiator screws | 18.44 lbf⋅ft |
Surge tank screws and nuts | 6.64 lbf⋅ft |
Transmission control module (TCM) cover screws | 6.64 lbf⋅ft |
Transmission control module (TCM) electrical connector screws | 5.9 lbf⋅ft |
Water outlet stud screws | 18.44 lbf⋅ft |
Water pump screws | 33.19 lbf⋅ft |
expand_moreElectric engine
Auxiliary battery wiring harness bracket screws | 7.38 lbf⋅ft |
Auxiliary battery relay nuts | 6.64 lbf⋅ft |
Auxiliary positive battery wiring harness screws | 12.54 lbf⋅ft |
Auxiliary positive battery wiring harness nuts | 5.9 lbf⋅ft |
Auxiliary positive wiring harness to relay nuts | 6.64 lbf⋅ft |
Battery wiring harness bracket screws | 18.44 lbf⋅ft |
Battery wiring harness channel bracket screws | 8.85 lbf⋅ft |
Battery wiring harness junction block bracket screws | 6.64 lbf⋅ft |
Battery hold down retainer screws | 18.44 lbf⋅ft |
Battery tray screws | 6.64 lbf⋅ft |
Battery tray nuts | 18.44 lbf⋅ft |
Auxiliary battery ground wiring harness screws | 11.8 lbf⋅ft |
Engine wiring ground harness screws | 11.8 lbf⋅ft |
Engine wiring ground harness screws | 18.44 lbf⋅ft |
Front axle mounting bracket nuts | 70.07 lbf⋅ft |
Forward lamp wiring ground harness screws | 6.64 lbf⋅ft |
Front end diagonal brace screws | 6.64 lbf⋅ft |
Generator wiring harness nuts | 6.64 lbf⋅ft |
expand_moreGenerator bracket screws
Right and rear | 18.44 lbf⋅ft |
Left | 36.88 lbf⋅ft |
Generator bracket screws and nuts | 30.24 lbf⋅ft |
Ground strap nuts | 6.64 lbf⋅ft |
Heater hose bracket screws | 18.44 lbf⋅ft |
Negative Battery wiring harness screws | 12.54 lbf⋅ft |
Negative Battery wiring harness bolt on the engine block | 11.8 lbf⋅ft |
Negative Battery wiring harness on the frame | 6.64 lbf⋅ft |
Positive battery wiring harness screws | 12.54 lbf⋅ft |
Positive battery wiring harness bolt on the engine block | 8.85 lbf⋅ft |
Positive battery wiring harness to engine wiring harness junction block screws | 6.64 lbf⋅ft |
Positive battery wiring harness to generator nuts | 13.28 lbf⋅ft |
Positive battery wiring harness to starter nuts | 11.8 lbf⋅ft |
Positive wiring harness at underhood bussed electrical center (UBEC) screws | 6.64 lbf⋅ft |
Starter screws | 31.72 lbf⋅ft |
Starter lead nuts | 6.64 lbf⋅ft |
Starter solenoid nuts | 2.51 lbf⋅ft |
Surge tank screws and nuts | 6.64 lbf⋅ft |
Transmission cover screws | 6.64 lbf⋅ft |
Wiring harness bracket screws | 18.44 lbf⋅ft |
expand_moreEngine controls
Accelerator cable bracket screws | 18.44 lbf⋅ft |
Accelerator cable bracket nuts | 8.85 lbf⋅ft |
Accelerator cable bracket nuts | 6.64 lbf⋅ft |
Air cleaner outlet ducts nuts | 1.84 lbf⋅ft |
Air ducts bracket stud screws | 5.9 lbf⋅ft |
Camshaft position (CMP) sensor screws | 1.62 lbf⋅ft |
Coolant hose nipple | 12.54 lbf⋅ft |
Crankshaft position sensor (CKP) mounting screws | 6.64 lbf⋅ft |
Distributor screws | 18.44 lbf⋅ft |
Distributor cap screws | 1.77 lbf⋅ft |
Engine coolant temperature sensor (ECT) | 14.75 lbf⋅ft |
EGR pipe bracket screws | 18.44 lbf⋅ft |
EGR pipe fitting on the exhaust manifold | 22.13 lbf⋅ft |
EGR pipe fitting on the intake manifold | 18.44 lbf⋅ft |
EGR valve attaching bolts, first step | 7.38 lbf⋅ft |
EGR valve attaching bolts, second step | 18.44 lbf⋅ft |
EVAP canister bracket screws | 18.44 lbf⋅ft |
EVAP canister purge valve mounting nuts | 8.85 lbf⋅ft |
EVAP canister bracket screws | 7.38 lbf⋅ft |
EVAP canister ventilation valve bracket screws | 8.85 lbf⋅ft |
Fuel lines fittings | 20.65 lbf⋅ft |
Fuel filler hose clamps | 18.44 lbf⋅ft |
Fuel filler hose ground strap screws | 6.64 lbf⋅ft |
Fuel filler hose housing screws | 1.7 lbf⋅ft |
Fuel filler ventilation hose clamp | 1.84 lbf⋅ft |
Fuel filter fittings | 18.44 lbf⋅ft |
Fuel lines in the engine compartment | 20.65 lbf⋅ft |
Fuel line clip screws | 4.43 lbf⋅ft |
Fuel line clip nuts | 18.44 lbf⋅ft |
Fuel line attaching nuts | 19.91 lbf⋅ft |
Fuel line to fuel rail retaining screws | 2.21 lbf⋅ft |
Fuel return line nuts | 2.21 lbf⋅ft |
Fuel pressure regulator bracket | 2.58 lbf⋅ft |
Fuel rail attaching screws | 7.38 lbf⋅ft |
Fuel tank shield to frame screws | 13.28 lbf⋅ft |
Fuel tank strap attaching screws | 29.5 lbf⋅ft |
Fuel tank bracket strap | 33.19 lbf⋅ft |
Heated oxygen sensor | 30.98 lbf⋅ft |
Idle air control attaching valve screws | 2.21 lbf⋅ft |
Ignition coil mounting screws | 8.11 lbf⋅ft |
Ignition module mounting screws | 2.58 lbf⋅ft |
Injector retainer lock nuts | 2.21 lbf⋅ft |
Knock sensor | 18.44 lbf⋅ft |
Mass air flow (MAF) hose clamp | 2.95 lbf⋅ft |
Power brake fitting | 9.59 lbf⋅ft |
Powertrain control module (PCM) end connector | 5.9 lbf⋅ft |
Pressure regulator screws | 7.38 lbf⋅ft |
Purge solenoid mounting nuts | 8.85 lbf⋅ft |
Purge valve mounting bracket screws | 5.9 lbf⋅ft |
Rotor hold down screws | 1.48 lbf⋅ft |
Spark plug new aluminium head | 14.75 lbf⋅ft |
Spark plug new iron head | 22.13 lbf⋅ft |
Spark plug used head | 11.06 lbf⋅ft |
Steering linkage shield mounting screws | 24.34 lbf⋅ft |
Throttle body assembly retaining stud screws | 6.64 lbf⋅ft |
Throttle cable bracket screws | 18.44 lbf⋅ft |
Throttle position sensor (TPS) screws | 1.48 lbf⋅ft |
Upper manifold screws | 5.9 lbf⋅ft |
Upper manifold nuts | 5.9 lbf⋅ft |
Vacuum module attaching screws | 5.9 lbf⋅ft |
expand_moreExhaust system
Engine shield screws | 14.75 lbf⋅ft |
EGR valve inlet pipe fitting to the exhaust manifold | 22.13 lbf⋅ft |
EGR valve inlet pipe fitting to the intake manifold | 18.44 lbf⋅ft |
EGR valve pipe to the cylinder head screws | 36.88 lbf⋅ft |
EGR valve pipe to the exhaust manifold screws | 22.13 lbf⋅ft |
EGR valve pipe to the intake manifold screws | 7.38 lbf⋅ft |
Exhaust heat shield screws | 6.64 lbf⋅ft |
Exhaust heat shield nut (body panel) | 6.64 lbf⋅ft |
Exhaust manifold stud screws | 22.13 lbf⋅ft |
Exhaust manifold heat shields | 6.64 lbf⋅ft |
Exhaust manifold pipe bracket | 0.00000047 in |
Exhaust manifold pipe nuts | 36.88 lbf⋅ft |
Exhaust muffler clamp | 22.13 lbf⋅ft |
Exhaust muffler hanger nuts | 36.88 lbf⋅ft |
Exhaust muffler nuts | 29.5 lbf⋅ft |
Exhaust pipe clamp | 29.5 lbf⋅ft |
Hood hinge screws | 18.44 lbf⋅ft |
Oxygen Sensor | 30.98 lbf⋅ft |
Rear shock absorber lower screws | 70.07 lbf⋅ft |
Spark plug wire retainer screws | 8.85 lbf⋅ft |
Transmission screws | 73.76 lbf⋅ft |