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Checking Timing An access plug is provided in the cam drive belt cover so that camshaft timing can be checked without removal of the cover or any other parts. 1. Remove the access plug from the cam drive belt cover. 2. Rotate the crankshaft so that the No. 1 piston is rising on compression stroke. 3. Set the crankshaft to TDC by aligning the timing mark on the crank pulley with the TC mark on the belt cover. Always turn the engine in the direction of normal rotation (clockwise, as viewed from the front). Backward rotation may cause the timing belt to jump time, due to the arrangement of the belt tensioner. 4. Look through the access hole in the belt cover to make sure that the timing mark on the cam drive sprocket is lined up with the pointer on the inner belt cover. 5. Install the belt cover access plug. Adjusting Timing Belt SPECIAL SERVICE TOOL(S) REQUIRED Description Crankshaft Belt Tension Adjusting Tool T74P-6254-A 1. Remove the outer timing belt cover as outlined in this section. CAUTION: Attempting to adjust timing belt tension without loosening spring pivot bolt will break Crankshaft Belt Tension Adjusting Tool T74P-6254-A when relieving tension on the belt. 2. If belt timing or tension is incorrect, loosen timing belt spring pivot bolt. 3. Hold tensioner with Camshaft Belt Tension Adjusting Tool T74P-6254-A. 4. While holding tensioner, loosen adjusting bolt and gradually release spring tension. Loosening Timing Belt Tensioner, 2.3L Tool Number 8 — 5. Using adjusting tool, pry tensioner away from belt. While holding, tighten adjusting bolt. There should be no tension on belt. Camshaft Timing Belt, 2.3L I-4 Timing Mark on Camshaft Sprocket Remove the bolts holding the crankshaft position sensor in place and pull the sensor assembly free of the dowel pin. 7. Remove the crankshaft pulley , crankshaft pulley hub and timing belt guide. 8. Remove the drive belt and inspect it for wear or damage. If the belt is damaged, replace it. 9. Remove one spark plug from each cylinder. 10. If not done: a. Loosen tensioner adjusting bolt. b. Using Camshaft Belt Tension Adjusting Tool T74P-6254-A, pry tensioner clockwise against spring tension as far as possible. c. Tighten adjusting bolt to hold tensioner in released position. 11. Align crankshaft so number one piston is at TDC (top dead center) as indicated by timing mark. 12. Line up camshaft sprocket timing mark with inner timing belt cover timing mark and key is pointing down.

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The above application is prone to the timing belt teeth lifting off the belt in service due to operating the belt with insufficient tension. The following instructions have been produced to assist in the fitting of your new timing belt, giving simple hints and tips, which should help avoid problems caused by adopting an incorrect fitting / adjustment procedure. For instructions for the removal of the engine components required to gain access to the timing belt, please refer to the vehicle workshop manual. Note:- Incorrect tension of the timing belt, can lead to the teeth lifting from the belt, resulting in belt failure, and subsequent major engine damage. Special Tools Required: 1) Timing belt tension gauge, (accurately calibrated), Part No’s: either Rover KM4088 or Borroughs BT33-86F 2) Two 8mm Allen keys (for tensioner adjustment) 3) Short length of round steel bar (for flywheel timing location) Fitting Procedure: 1) Before the old timing belt is removed, the crankshaft should be rotated clockwise to align the timing mark on the crankshaft pulley with the edge of the metal bracket, which forms part of the lower timing belt cover (See I). To lock the crankshaft in this position, which is 90 degrees before top dead centre, insert a steel rod of the correct diameter into the hole on the gearbox / engine adaptor plate, positioned on the front facing lower edge of the cylinder block (See diagram B), and locate with the corresponding hole in the flywheel. The timing marks on the camshaft gears should now be aligned at the 3 o’clock position for the left hand gear, and the 9 o’clock position for the right hand gear (See II). Undo the timing belt tensioner Allen bolt and remove tensioner. The old timing belt can now be removed (See III). Check the condition of the geared teeth on the camshaft, crankshaft, and water pump drives. Check the tensioner, water pump, and idler bearings. Fit the new timing belt over the drive gears, ensuring the timing marks set at ‘I’and‘II’ have not moved. Refit the tensioner using the anti-slip washer ‘IV’ supplied with the new timing belt. The anti-slip washer should be fitted between the tensioner and the backplate, with the abrasive side facing towards the tensioner. Note: A new anti-slip washer must always be fitted. Non modified vehicles will not have the anti-slip washer fitted. Rotate the tensioner, using the Allen key drive to set the initial pre-load tension, sufficient to prevent the timing belt from slipping over the toothed drives, then tighten the Allen bolt to 45Nm.

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Installation Instructions 1. Clean everything! Make sure that the engine mounting surfaces and your new timing set have been thoroughly cleaned with a good solvent. 2. If you are using a timing set with three keyways, select the appropriate keyway for your camshaft timing specifications. COMP Cams ® recommends the standard timing position for most applications. This position uses the round or “O” timing and keyway marks. Standard Timing Location: This is the same as original O.E.M. setting. Use keyway and crankshaft gear tooth marked “O”. 4 Degree Advance: Use keyway and crankshaft tooth marked . Note: The or advanced position should not be used without degreeing the camshaft. Many camshafts have the proper advance built in. Advancing the cam will reduce intake valve to piston clearance and increase exhaust piston to valve clearance. 4 Degree Retard: Use keyway and crankshaft gear tooth marked . Note: The or retarded position should not be used without degreeing the camshaft. Many cams have the proper advance built in. Retarding the cam will reduce exhaust valve to piston clearance and increase intake piston to valve clearance. 3. Install your lower timing gear on the crankshaft making sure that the timing marks are facing out toward you. 4. Now that the lower timing gear has been installed check the timing mark alignment in your engine manual. Rotate the crankshaft using your crankshaft socket until the timing mark on the gear is in the proper position (12 o’clock). For 240-300 6 cyl. see Note 1 before proceeding! 5. If your engine is equipped with a camshaft retaining plate or thrust plate, it should be installed at this time. Note that many Ford thrust plates are marked “back – bottom”. Before final installation check to make sure that the thrust plate is fitted correctly. 351W owners see Note 2 before proceeding! 6. Temporarily install your camshaft timing gear and rotate the camshaft until the timing mark on the camshaft gear is in the proper position per your engine manual instructions (6 o’clock).

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TIMING BELT Removal 1. Disconnect negative battery cable. Remove upper engine torque strut attaching bolts and remove engine torque strut. See Fig. 5 . Remove engine torque strut bracket from strut tower. On PT Cruiser (Turbo), discharge and evacuate A/C system. Disconnect A/C lines at junction block near upper timing belt cover. 2. On all models, remove upper timing belt cover bolts and remove cover. See Fig. 6 . Raise vehicle on hoist and remove right front wheel. Remove splash shield. See Fig. 7 . Remove accessory drive belts. Remove crankshaft damper. See Fig. 8 . Remove pencil strut. See Fig. 2 . Remove lower engine torque strut. See Fig. 5 . 3. Disconnect exhaust system front pipe from manifold. Disconnect A/C pressure switch at rear of compressor housing. Lower vehicle and support engine with a jack. If not done previously, discharge and evacuate A/C system. Disconnect A/C lines at junction block. Remove screw attaching ground strap to strut bracket. Remove torque strut bracket from strut tower. Remove upper radiator closure panel. Without disconnecting lines from power steering pump, remove pump and bracket and set pump aside. 4. With engine properly supported, remove right engine mount through-bolt. See Fig. 5 . Raise engine with jack until engine support bracket bolts are accessible, and remove engine support bracket. See Fig. 9 . Remove lower timing belt cover bolts and remove cover. See Fig. 6 . CAUTION: When aligning crankshaft and camshaft timing marks, always rotate engine from crankshaft. Camshaft should not be rotated after timing belt is removed, or damage to valve components may occur. CAUTION: Crankshaft sprocket TDC mark is located on the trailing edge of sprocket tooth. Failure to align trailing edge of sprocket tooth to TDC mark on oil pump housing will cause camshaft timing marks to be misaligned. 5. Before removal of timing belt, rotate crankshaft until TDC mark on oil pump housing aligns with the TDC mark on crankshaft sprocket (trailing edge of sprocket tooth). See Fig. 10 . 6. Loosen timing belt tensioner lock bolt, and insert a 6-mm Allen wrench into hexagon opening located on top plate of belt tensioner pulley. See Fig. 11 . Rotate top plate clockwise until there is enough slack in timing belt to allow for removal. If reusing old timing belt, mark belt with arrow to indicate original direction of rotation. Remove timing belt. CAUTION: If timing belt was damaged due to incorrect rotating tracking (alignment), belt tensioner pulley and bracket must be replaced as an assembly.

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APPLIED VEHICLES: 2004-2008 Maxima (A34) 2004-2006 Altima (L31) with VQ35 engine ONLY 2004-2009 Quest (V42) IF YOU CONFIRM: There is a high frequency buzzing / whining noise coming from the secondary timing chain system. • The noise should increase in frequency with engine speed (RPM). • If the noise does not increase with engine speed, the timing chain system may not be the cause. Refer to the appropriate section of the Electronic Service Manual (ESM) for further diagnosis. ACTION: 1. Replace both secondary timing chains and both secondary timing chain tensioner “shoes” with the ones from the PARTS INFORMATION section of this bulletin (on Page 2). 2. Change the engine oil and filter. 3. For repair procedure, refer to the SERVICE PROCEDURE section of this bulletin (starting on Page 3). SERVICE PROCEDURE Write down all radio station presets. 2. Disconnect both battery cables, negative cable first. 3. Remove the secondary timing chains. Refer to the Electronic Service Manual (ESM) if needed. NOTE: It is not necessary to remove the valve covers or intake collector. • Before removing the crankshaft pulley, set it to 0° Top Dead Center (TDC). • Use Tool J-50288 to secure the flywheel / flex plate when removing the crankshaft pulley and camshaft sprockets (no picture shown). NOTE: The camshaft sprockets’ bolts will be removed and installed while being held by all three (3) timing chains. • If the crankshaft is determined to be 360° off from 0° TDC on #1 cylinder compression stroke after removing the front timing chain case (front cover), put the crankshaft pulley back on, and then rotate the crankshaft 360° (when camshaft and crankshaft sprocket mating marks are aligned). • Use the chain tensioner pins (pin) from Tool Kit J-50246 to hold all 4. Remove the chain tensioner plungers. three (3) Secondary Timing Chain Tensioner 1 shows a pin by evenly prying Figure Shoes (shoe) used on B2 with a couple pocket screwdrivers or tensioner. suitable tool where shown in Figure 1. NOTE: The primary timing chain will be reused. If the original markings are not legible, it is recommended to NOTE: Leave the pins from Tool mark this chain tensioner sprockets J-50246 in eachto all three until the with “white-out” or suitable timing chains are installed. marking before removing. 4. Remove the Secondary Timing Chain Tensioner Shoes (shoe) by evenly prying with a couple pocket to the tensioners 5. Install the new shoesscrewdrivers or suitable tools where shown in Figure 2. with Tool J-50246 (see Figure 2). NOTE: Leave the pins from Tool J-50246 in each tensioner until Tighten the bolt until installed. the timing chains are the shoe is fully seated. • CAUTION: Tighten the bolt no more than necessary.