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1. Disconnect negative battery cable. Remove engine undercover. Place wooden block between jack and oil pan, and raise engine slightly. Remove engine mount assembly near timing belt cover. 2. Remove clamp for power steering return hose near timing belt cover. Remove all drive belts and tensioner pulley bracket. See Fig. 1 . Remove power steering and water pump pulleys. Rotate crankshaft clockwise so that No. 1 cylinder is at TDC of compression stroke. Remove crankshaft pulley. CAUTION: DO NOT rotate crankshaft counterclockwise. Ensure timing marks are aligned. If reusing timing belts, mark timing belts for direction of rotation. 3. Remove upper timing belt cover and gasket. Remove stub bolt of engine support bracket, and remove center timing belt cover. Remove lower timing belt cover. NOTE: Camshaft sprocket dowel pins will be in 12 o’clock position when timing marks are correctly aligned. 4. Ensure camshaft, crankshaft and oil pump sprocket timing marks are aligned. See Fig. 2 or Fig. 3 . Loosen tensioner pulley center bolt. Move tensioner to relieve timing belt tension. Remove timing belt. Remove timing belt auto tensioner. See Fig. 1 . 5. Remove plug from left side of cylinder block. Install a .31″ (8.0 mm) diameter Phillips screwdriver into the hole against balance shaft. See Fig. 4 . Screwdriver must go in at least 2.36″ (60 mm) or more. If screwdriver will only go in about .79-.98″ (20-25 mm) before striking balance shaft, turn sprocket one revolution and align timing mark. Keep screwdriver in place until timing belt is installed. This ensures balance shaft driven by oil pump sprocket remains in correct position. 6. To remove timing belt “B” (balance shaft belt), hold crankshaft sprocket stationary with a spanner wrench. Remove crankshaft sprocket bolt. Using gear puller, remove outer crankshaft sprocket. 7. Remove crankshaft sensing blade (if equipped). See Fig. 5 . Loosen timing belt “B” tensioner bolt. If reusing timing belt “B”, mark direction of belt rotation for reassembly reference. Remove timing belt “B”.

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MANUFACTURER’S SUGGESTED SCHEDULED MAINTENANCE The manufacturer recommends the belt be replaced every 60,000 miles, except in California. In California, inspect timing belt at 60,000 miles, and replace as necessary. REMOVAL & INSTALLATION CAUTION: This application is an interference engine. Do not rotate camshaft or crankshaft when timing belt is removed, or engine damage may occur. TIMING & COUNTERBALANCE SHAFT BELTS Removal CAUTION: DO NOT rotate engine counterclockwise (as viewed from timing belt end of engine). If reusing timing belt, place reference mark on timing belt to indicate direction of rotation before removing. 1. Remove drive belts and drive pulleys from crankshaft and water pump. Remove timing belt covers. To align timing marks, rotate engine clockwise so No. 1 cylinder is at TDC of compression stroke. Ensure camshaft sprocket timing marks align with upper surface of rocker cover. Dowel pin of camshaft sprocket should be pointing upward. See Fig. 1 and Fig. 2 . 2. Remove timing belt auto tensioner. If reusing timing belt, place mark on timing belt to indicate direction of belt rotation. Remove timing belt. Remove camshaft sprockets. 3. Remove plug at left side of block and insert a screwdriver to hold left counterbalance shaft in position. Screwdriver will have to be inserted at least 2.36″ (60 mm). Remove oil pump sprocket nut and sprocket. See Fig. 2 . 4. Loosen right counterbalance shaft sprocket mounting bolt. Remove tensioner “B” and timing belt “B”. See Fig. 2 . Remove crankshaft sprocket “B” from crankshaft.

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T] EXHAUST CAMSHAFT (RIGHT) T| INTAKE CAMSHAFT (RIGHT) T] SECONDARY TIMING BELT IDLER PULLEYS T) INTAKE CAMSHAFT (LEFT) 7] EXHAUST CAMSHAFT (LEFT) T] COOLANT PUMP T] INTERMEDIATE SHAFT BELT SPROCKET T] SERPENTINE BELT TENSIONER T| SECONDARY TIMING BELT TENSIONER PULLEY ??] GENERATOR ??] SECONDARY TIMING BELT TENSIONER ?2? SECONDARY TIMING BELT NOTE: START AT #7 AND INSTALL COUNTERCLOCIOMBE A LOCATION OF TIMING MARKS WITH CAM HOLD DOWN TOOLS J 38813 INSTALLED B FRONT COVER TIMING MARK C LOCATION OF TIMINS MARKS WITH DRIVE BELT IN- STALLED D LOCATION WHERE CAM HOLD DOWN TOOLS ARE INSTALLED RH EXHAUST CAMSHAFT SPROCKET RH INTAKE CAMSHAFT SPROCKET LH INTAKE CAMSHAFT SPROCKET LH EXHAUST CAMSHAFT SPROCKET PERMANENT MARKS PAINTED DOTS REMOVE PREVIOUS MARKS IF TIMING IS BEINS CHANGED AND MARK AGAIN IN THESE LOCATIONS TORSIONAL DAMPER INTERMEDIATE SHAFT SPROCKET NOTE: THIS TDC #1 EXHAUST. INTtRMEDlATE »HAFT BELT sprocket twno mark» at » o’clock (powtmo towards drain notch) NOTE : GM does not provide a timing mark diagram for belt installation without using the special tool(s) listed below. TOOLS REQUIRED: A J 38613 CamHold Down Tool A J 38614 Cam Sprocket Holding Tool NOTICE: If only one (1) bank is to be timed, make sure bank to bank earn timing relationship is one (1) revolution apart. Timing flats should be 180 degrees opposite (right bank versus left bank) when finally timed. 1. Remove all spark plugs. 2. Remove all camshaft sprockets. IMPORTANT: Remove oil from cam hold down tool bolt hole in carrier before installing and tightening bolt. 3. Rotate camshaft flats “up” and install J 38613. Tighten cam hold down tool bolt to 30 Nm (22 lb. ft). 4. Install all camshaft sprockets. 5. Timing belt by routing it around the idlers and sprockets. DO NOT bend, kink, or pry on belt as damage may occur. A. Start at intermediate cam sprocket and work counterclockwise. B. Make sure the belt is installed in direction of rotation. C. Engage teeth into all sprockets, place rubber hose behind belt at intermediate sprocket and accumulate slack at tensioner location. 6. Tensioner pulley to mounting base. A Use flat magnet, tape or cup plug to hold pivot tube in pulley during this step. Otherwise, pivot tube may fall out. A After starting pivot bolt, rotate arm counterclockwise to position square lug at 6 o’clock

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1. Remove all drive belts. Remove crankshaft pulley and water pump pulley. Remove upper and lower timing belt covers, noting bolt lengths and locations. 2. Turn crankshaft clockwise and align timing marks so No. 1 cylinder is at TDC. Timing marks on
camshaft sprockets should be aligned at upper surface of cylinder head. See Fig. 1 . Camshaft sprocket dowel pins should face upward. CAUTION: DO NOT rotate crankshaft counterclockwise (as viewed from timing belt end of engine). If reusing timing belt, mark direction of belt rotation before removing. 3. Remove timing belt automatic tensioner. See Fig. 2 . Mark timing belt to indicate original direction of rotation. Remove timing belt. 4. Remove balance shaft access plug from cylinder block. Insert Phillips screwdriver to block left balance shaft. See Fig. 3 . Balance shaft is correctly locked in place if screwdriver can be inserted at least 2.36″ (60 mm). If not, rotate oil pump sprocket so screwdriver can be inserted to correct depth. 5. Loosen balance shaft belt tensioner bolt. Remove front crankshaft sprocket and flange. Remove balance shaft timing belt.

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TIMING & BALANCE SHAFT BELTS Removal 1. Disconnect negative battery cable. Position crankshaft with cylinder No. 1 at TDC of compression stroke. See Fig. 1 , Fig. 2 or Fig. 3 . Disconnect battery negative cable. Remove splash shield. Remove cruise control actuator, leaving cable connected. Remove power steering pump, leaving hoses connected. 2. Disconnect alternator wiring. Remove wiring harness from valve cover. Remove alternator and A/C belts (if equipped). Remove valve cover and upper timing belt cover. Remove side engine mount. Remove engine oil dipstick and tube. Remove crankshaft pulley. See Fig. 4 . 3. Support engine. Remove 2 rear bolts from engine center support beam. Lower engine enough to permit removal of lower timing belt cover. Remove rubber seal from belt tension adjuster nut. Remove lower timing belt cover. CAUTION: DO NOT rotate crankshaft or camshaft when removing timing belts.