Not all 4.3 engines have adjustable ignition timing. Some have crank-fire ignition; timing is entirely controlled by the onboard computer. Thus there is no user adjustable timing. Check a Haynes or Chilton manual. If you do have adjustable timing, be very careful about a specific sequence required to set the timing. Once again, check a manual.
After disassembling to expose timing belt, look for TDC and ATDC timing marks. Align them, allowing 43 centimeters. Set BTDC mark in like manner.
the 1996 s-10 blazer 4.3 vortec has the computer in the engine compartment on the left hand side....if this is true, you cannot, I repeat, cannot adjust the timing.....the computer adjust the timing....you should be able to read it on the sticker under the hood..... ------- The timing is computer controlled - no way to adjust it, the computer does all of that for you.
Small Talk - 1996 1-43 was released on: USA: 27 November 1996
1. f the timing belt is to be removed, it is good practice to turn the crankshaft until the engine is at Top Dead Center (TDC) of the No. 1 cylinder, compression stroke (firing position), before beginning work. This should align all timing marks and serve as a reference for all work that follows. After verifying that the engine is at TDC for the No. 1 cylinder, do not crank the engine or allow the crankshaft or camshaft sprockets to be turned otherwise engine timing will be lost.2. Drain the cooling system.3. Disconnect the negative battery cable.4. Remove the alternator drive belt, water pump and power steering pump belt and the air conditioning compressor belt, if equipped, using the recommended drive belt removal procedure.5. If equipped with air conditioning, remove the 3 air conditioning compressor drive belt idler pulley bolts and remove the idler pulley.6. Remove the upper radiator hose bracket bolt. Remove the upper hose with the bracket from the vehicle.7. Remove the water bypass hose from between the thermostat housing and the lower water hose connection.8. Remove the main wiring harness from the upper engine front cover.9. Remove the 8 upper engine front cover bolts and remove the upper cover.10. Raise and safely support the vehicle.11. Remove the right side front wheel and tire assembly.12. Remove the 4 right side engine and transmission splash shield bolts and 2 screws, and remove the right side outer engine and transaxle splash shield.13. Use a strap wrench to hold the water pump pulley. Remove the 4 pulley bolts, and the water pump pulley.14. Use a strap wrench to hold the crankshaft pulley. Remove the center pulley bolt, and the crankshaft pulley using a harmonic balancer (damper) puller to draw the pulley from the front of the crankshaft.15. Remove the 5 lower engine front cover bolts, then remove the lower engine front cover.16. Be sure that the timing marks between the crankshaft sprocket and the oil pump housing align.17. If the timing belt is to be reused, mark an arrow on the belt indicating the direction of rotation. The directional arrow is necessary to ensure that the timing belt, if it to be reused, can reinstalled in the same direction.18. Loosen the timing belt tensioner nut and slip the timing belt off of the sprockets.19. If necessary, the camshaft sprockets can be removed. A special spanner tool is designed to hold the sprocket to keep it from turning while the center bolt is being loosened. Use care if using substitutes.Note: If necessary, the crankshaft sprocket can be removed. The outer timing belt guide (looks like a large washer) and the crankshaft sprocket simply pull off the front of the crankshaft.-To install-1. Clean all parts well. If removed, inspect the crankshaft sprocket for warping or abnormal wear. Check the sprocket teeth for wear, deformation, chipping or other damage. Replace as necessary. Clean the sprocket mounting surface to ease installation. Install the key. Slip the sprocket onto the crankshaft. Tap it in place with a suitably-sized socket.2. If removed, inspect the camshaft sprockets for damage and wear. Replace as required. The sprockets should be markedL3to designate the front, or left side camshaft and R3 to designate the rear, or right side camshaft. Use care to install the sprockets properly. A special spanner tool is designed to hold the sprocket to keep it from turning while the center bolt is being tightened. Use care if using a substitute. Tighten the camshaft sprocket center bolts to 58-65 ft. lbs. (78-88 Nm) for the 3.0L engine or 61 ft. lbs. (83 Nm) for the 3.3L engine. Verify that the timing marks on the camshaft sprockets and the timing marks on the rear cover (called the seal plate) are aligned.3. Use an Allen wrench to turn the timing belt tensioner clockwise until the belt tensioner spring is fully extended. Temporarily tighten the tensioner nut to 32-43 ft. lbs. (43-58 Nm).4. If a new timing belt is to be installed, look for a printed arrow on the belt. Be sure the arrow is pointing away from the engine. If the original timing belt is to be reused, be sure that the directional arrow that was marked at disassembly is facing the correct direction.5. A new Original Equipment Manufacture (OEM) timing belt should have 3 white timing marks on it that indicate the correct timing positions of the camshafts and the crankshaft. These marks are to help ensure that the engine is properly timed. When the engine is properly timed, each white timing mark on the timing belt will be aligned with the corresponding camshaft and crankshaft timing mark on the sprocket. Because the white timing marks are not evenly spaced, the technician needs to use care in installing the belt. There should be 40 timing belt teeth between the timing marks on the front and rear camshaft sprockets and 43 teeth between the timing mark on the front camshaft sprocket and the timing mark on the crankshaft sprocket.6. Verify that the camshaft timing marks are aligned with the timing marks on the rear cover (seal plate) and that the crankshaft sprocket timing mark is aligned with the timing mark on the oil pump housing.7. Install the timing belt starting at the crankshaft sprocket and moving around the camshaft sprockets following a counterclockwise path. Do not allow any slack in the timing belt between the sprockets. After all of the timing marks are aligned with the timing belt installed, slip the timing belt onto the belt tensioner.8. While holding the timing belt tensioner with an Allen wrench, loosen the tensioner nut. Allow the tensioner to put pressure on the timing belt. Use an Allen wrench to turn the timing belt tensioner 70-80 degrees clockwise and tighten the timing belt tensioner nut to 32-43 ft. lbs. (43-58 Nm).9. Rotate the crankshaft clockwise twice and align the No. 1 piston to TDC on the compression stroke (firing position).10. Apply 22 lbs. (10kg) of force on the timing belt between the rear camshaft sprocket and the timing belt tensioner. An assistant may be needed. While holding the timing belt tensioner steady with an Allen wrench, loosen the timing belt tensioner nut. Remove the Allen wrench and adjust the timing belt tensioner using the following procedure:§ Install a 0.0138 in. (0.35mm) thick and 0.500 in. (12.7mm) wide feeler gauge where the timing belt just starts to go around the tensioner (approximately the 4 o'clock position, looking at the tensioner).§ Turn the crankshaft sprocket clockwise, which should force the feeler gauge between the timing belt and the tensioner, up to a position on the tensioner of about 1 o'clock.§ Tighten the timing belt tensioner nut to 32-43 ft. lbs. (43-58 Nm) for the 3.0L engine or 61 ft. lbs. (83 Nm) for the 3.3L engine.§ Turn the crankshaft clockwise to rotate the feeler gauge out from between the timing belt tensioner and the timing belt.11. Rotate the crankshaft clockwise twice, and once again align the No. 1 piston to TDC on the compression stroke (firing position).12. Apply 22 lbs. (10 kg) of force on the timing belt between the front and rear camshaft sprockets. Measure the amount of belt deflection. Belt deflection should be between 0.51-0.59 in. (13-15mm). If belt deflection is out of specification, repeat Steps 29 through 33. If the timing belt deflection cannot be adjusted into specification, the timing belt will have to be replaced.13. Position the lower engine front cover and install the 5 lower cover bolts. Do not over tighten. Tighten to 27-44 inch lbs. (3-5 Nm).14. Install the outer timing belt guide next to the crankshaft sprocket with the dished side facing away from the cylinder block. Install the crankshaft pulley. Use a strap wrench to keep the crankshaft pulley from turning and tighten the center bolt to 90-98 ft. lbs. (123-132 Nm) for the 3.0L engine or 148 ft. lbs. (201 Nm) for the 3.3L engine.15. Position the water pump pulley on the pump. Install the 4 bolts. Use a strap wrench to keep the water pump pulley from turning and tighten the 4 water pump pulley bolts to 12-15 ft. lbs. (16-21 Nm) for the 3.0L engine or 89 inch lbs. (10 Nm) for the 3.3L engine.16. Position the right side outer engine and transaxle splash shield, and secure with the 4 bolts and 2 screws.17. Install the right side front wheel and tire assembly. Tighten the lug nuts to 72-87 ft. lbs. (98-118 Nm).18. Lower the vehicle.19. Position the upper engine timing belt front cover and tighten the 8 bolts to 27-44 inch lbs. (3-5 Nm).20. Install the main wiring harness on the upper engine front cover.21. Position the water bypass hose between the thermostat housing and water connection. Install the upper radiator hose between the radiator and the water hose connection. Secure the hoses with clamps. Install the upper radiator hose bracket. Tighten the bracket bolt to 34-58 ft. lbs. (46-65 Nm).22. If equipped, position the air conditioning compressor drive belt idler pulley and install the 3 bolts. Tighten to 15 ft. lbs. (21 Nm).23. Install and adjust the alternator drive belt, the water pump and power steering pump drive belt and the air conditioning compressor drive belt, if equipped.24. Connect the battery cable.25. Fill the cooling system.26. Start the engine and allow it to warm to operating temperature. Check and adjust the ignition timing. Road test to verify correct engine operation.
Amor sagrado - 1996 1-43 is rated/received certificates of: Argentina:Atp
CAUTIONS: 1993 and 1994-96 timing belts are non-interchangeable. 1993 belt design was changed from a square or trapezoid type to a half circle or round type for 1994-96, This design extends service life of timing belt from 60,000 miles to 105,000 miles. Failure to install correct timing belt may result in a "whining" noise from engine compartment after replacement. Do not interchange individual components (timing belts, sprockets or tensioner spring assembles) between 1993 and 1994-96 model vehicles. These parts are interchangeable as a set only. REMOVAL Disconnect battery ground cable, then drain coolant. Remove accessory drive belts. Remove A/C compressor drive belt idler pulley (tensioner) bolts, then idler pulley (tensioner). Remove upper radiator hose bracket bolt. Loosen two upper radiator hose clamps, then remove upper hose and bracket. Remove coolant bypass hose between thermostat housing and intake manifold coolant outlet. Disconnect main wiring harness from upper front cover (timing belt) cover, then remove eight upper timing belt cover bolts, then the upper cover, Fig. 20. Raise and support vehicle. Remove right front wheel and tire assembly and splash shield. Use strap wrench tool No. D85L-6000-A, or equivalent, to hold water pump pulley while removing water pump pulley bolts. Remove water pump pulley from water pump. Remove crankshaft pulley. Remove five lower timing belt cover attaching bolts and the cover. Rotate crankshaft in a clockwise direction to align crankshaft and camshaft sprocket timing marks, Fig. 21. If timing belt is to be reused, mark direction of rotation. Loosen timing belt tensioner nut, then remove timing belt. CAUTION: With timing belt removed, avoid turning camshaft or crankshaft. If movement is required, exercise extreme caution to avoid valve damage caused by piston contact. INSTALLATION Using suitable Allen wrench, turn timing belt tensioner clockwise until timing belt tensioner spring is fully extended, then temporarily torque timing belt tensioner nut to 32-43 ft. lbs. Install timing belt. If new belt, ensure white lines on belt align with seal plate (rear timing belt cover) timing marks and timing belt arrow is pointing away from engine block. If reusing timing belt, ensure removal directional arrow is pointing in correct direction. There should be 40 timing belt teeth between left and right camshaft sprockets and 43 teeth between lefthand camshaft sprocket and crankshaft timing belt sprocket. While holding timing belt tensioner pulley in position with suitable hex wrench, loosen tensioner nut. Allow timing belt tensioner to tension belt. Using suitable hex wrench, turn timing belt tensioner 70-80 degrees clockwise, then torque timing belt tensioner nut to 32-43 ft. lbs. Rotate crankshaft clockwise twice and align No. 1 piston to compression stroke TDC. Apply 22 lbs. of force on timing belt between righthand camshaft sprocket and timing belt tensioner. Using suitable hex wrench, hold timing belt tensioner, then loosen tensioner nut and adjust timing belt as follows: Install suitable 0.0138 inch and .5 inch wide feeler gauge between timing belt tensioner, Fig. 22. Installing Feeler Gauge Between Timing Belt & Tensioner Turn crankshaft clockwise to position feeler gauge between timing belt tensioner and timing belt. Torque timing belt tensioner nut to 32-43 ft. lbs. Turn crankshaft clockwise to remove feeler gauge. Rotate crankshaft sprocket clockwise twice and align No. 1 piston to TDC compression stroke. Apply 22 lbs. of force on timing belt between right and lefthand crankshaft sprockets. Using suitable tool, measure timing belt deflection, 0.51-0.59 inch should be indicated. If not as indicated, repeat step 9. If deflection is still not as indicated, belt may be stretched and have to be replaced. Install lower engine front (timing belt) cover. Install crankshaft and water pump pulley. Install righthand splash shield and wheel assembly. Lower vehicle and install upper timing cover. Connect main wiring harness to upper timing belt cover. Install coolant bypass hose between thermostat housing and intake manifold coolant outlet. Install upper radiator hose, then upper radiator hose bracket. Install A/C compressor drive belt tensioner, then install and adjust accessory drive belts. Check and adjust ignition timing as required.
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