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 |