Toyota 13080-31030 Gear Assy, Camshaft Timing Exhaust, LH

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Caution should be exercised during the removal process of the timing system, as any mistakes can lead to severe engine damage. It's advisable not to attempt this procedure without substantial experience in such repairs; consult an expert if uncertain. To initiate the removal, it's recommended to remove the engine/transaxle assembly and the drivebelt, including the drive-belt tensioner and idler pulleys. Set the engine to TDC and remove the crankshaft pulley with care to prevent any damage. Proceed to remove the timing chain cover bolts and the water inlet, along with its O-ring and gasket. Afterward, detach the timing chain cover, ensuring caution in specific removal spots to prevent cover damage. Remove the old crankshaft seal meticulously. Verify the No. 1 piston's position, setting it near TDC on its compression stroke. Ensure alignment of the timing marks on camshaft timing sprockets and the crankshaft sprocket. Following this, manipulate the No. 1 tensioner to lock it and remove it, subsequently removing the chain tensioner slipper. Proceed to remove the idler sprocket shaft and the chain vibration dampers. Take note of the timing marks on each sprocket before removing the No. 1 timing chain and the crankshaft timing chain sprocket. On the right (rear) cylinder head, compress chain tensioner No. 2 and insert a drill bit or punch to lock it. Remove the camshaft timing sprockets and chain assembly, ensuring components are kept separate. Repeat the process for timing chain No. 3 on the left (front) cylinder head. Inspect all timing chain assembly parts for wear or damage, checking the chains for stretch and sprockets for appropriate diameter. Measure idler sprocket oil clearance and evaluate the condition of tensioners and vibration dampers. Ensure correct operation of the chain tensioners. During installation, lock chain tensioner No. 2 with a drill or punch, then proceed to install the tensioners, followed by the timing chains on the camshaft sprockets. Align yellow marking links and timing marks as specified. Install chain guides, the crankshaft timing sprocket, and the idler sprocket collar. Verify alignment of timing marks on camshaft sprockets. Install the No. 1 timing chain, ensuring proper alignment of marks, and lock the No. 1 tensioner with a drill or punch. Remove the drill or punch and confirm tension. Clean surfaces, install a new crankshaft oil seal, O-ring, and apply RTV sealant on the timing chain cover. Slide the cover into place, reinstalling all bolts sequentially and ensuring proper torque. Finally, follow the reverse procedure for the remaining installation steps, refilling fluids, reconnecting the battery, and checking for leaks upon starting the engine.

In addition to the alignment of the timing belt, the marks in other camshaft sprockets and crankshaft sprockets should be checked after applying the timing belt and before starting the engine, because if the belts are not properly aligned the valves and pistons are likely to be damaged. Start with the removal of the cable from the negative terminal of the battery, then the under-vehicle splash shield and in the last the coolant. Further, do away with the fan shroud and fan assembly, drivebelt, and power steering pump but without severing its hoses accompanied by the alternator and air conditioning compressor but without disconnecting refrigerant lines. Disconnect the throttle body cover solenoid, the drivebelt idler pulley, and if there is any, the hoses from the oil cooler pipe and remove it. Take off the number 3 timing belt covers on the left and the right side, the number 2 timing belt cover, and fan bracket. Remove the drivebelt tensioner and then switch on the engine to bring the number one piston at the top dead center with the correct alignment of the marks on the camshaft and crankshaft sprockets. The crankshaft pulley has to be unbolted with the use of a wrench while locking it to prevent the engine from rotating as well as the number one timing belt cover should also be detached together with the crankshaft sensor timing plate. Take some time to confirm that both the timing marks are at the correct position once you have detached the crankshaft pulley and if you are preserving the belt, you should mark it before you remove it from the sprocket. Remove crankshaft pulley and bolt, turn crankshaft 45-degrees in anticlockwise position, then re-fit the crankshaft pulley and bolt. Take out the timing belt tensioner and you let go of the timing belt between the right side camshaft sprocket and the crankshaft sprocket. Pull out the timing belt from the sprockets, also if required, take off number 1 and number 2 idler pulley. Indeed, it is very important that this crankshaft sprocket be inspected for either wear or signs of damage: if it is found to be damaged or worn out, then the same has to be removed by the use of screwdrivers or a puller. This timing belt is the one that needs to be inspected for whether it is worn, on the other hand the water pump also needs to be checked on whether it is worn as well. Ensure the belt tensioner looks for signs of oil leaks and ensure the pushrod protrusion is adjusted to standard sizes. The overall timing belt area should be cleaned in preparation for the reinstallation of idler pulleys if they were removed during the testing procedure the crankshaft timing sprocket's keyway should also be aligned before the sprocket is installed. The marks on the camshaft sprocket should align with the marks you have set; rotate the crankshaft back to TDC again. Place the timing belt over the sprockets and idler pulleys according to the drawing, turn the timing belt tensioner pushrod and fix it. Rotate the crankshaft slowly two revolutions around clockwise and left anticlockwise and redo the timing marks while no resistance is to be perceived. Place back the crankshaft sensor timing plate, number 1 timing belt cover and gasket, crankshaft pulley and drivebelt tensioner accordingly; Tighten all bolts to the specified torque. Refit the fan bracket, air conditioning compressor, upper timing belt cover and gasket, together with the left and right no. 3 timing belt covers and the remainder in the reverse order. For water and anti-freeze coolant, add more and turn on the cars engine in order to detect any leaks and performance.

This complex procedure should only be attempted by those with extensive knowledge of such repairs or by consulting an expert.

The initial steps include removing the engine/transaxle assembly, the drivebelt, including the drive-belt tensioner and idler pulleys, and setting the engine to TDC (Top Dead Center).

Rotate the crankshaft pulley counterclockwise 60 degrees BTDC and remove the timing belt tensioner.

Components such as the crankshaft pulley/vibration damper and timing chain cover need to be removed during the procedure.

Verify that the piston in the No. 1 cylinder is near TDC on its compression stroke.

Before beginning, make sure you have the necessary special tools and equipment ready. Disconnect the battery's negative terminal and proceed to remove the drive belt, alternator, valve cover, and ABS actuator if applicable.

Ensure the TDC marks on the camshaft sprockets are still in alignment.

Remove the power steering pump and alternator.

Align the keyway with the crankshaft key and install the sprocket with the flange side up.

Slip the timing belt guide off the crankshaft.

1. Disconnect the cable from the negative terminal of the battery. 2. Drain the engine oil and coolant. 3. Remove the battery. 4. Remove the engine cover. 5. Remove the air filter housing. 6. Remove the radiator and the cooling fan. 7. Remove the serpentine drive belt. 8. Remove the upper intake manifold. 9. Remove the ignition coils and the valve covers. 10. Remove the Variable Valve Timing (VVT) sensor. 11. Remove the dipstick and dipstick tube. 12. Disconnect the electrical connector from the power steering pressure switch and detach the power steering pump. 13. Remove the alternator. 14. Detach the air conditioning compressor. 15. Unbolt the drive belt tensioner. 16. Remove the idler pulley bolts and the two idler pulleys. 17. Remove the crankshaft pulley. 18. Remove the four bolts from the front of the upper oil pan. 19. Remove the two oil cooler hoses. 20. Disconnect the two radiator hoses from the water inlet. 21. Disconnect all five water bypass hoses. 22. Remove the water inlet and discard the old 0-ring and gasket. 23. Remove the timing chain cover and keep track of the bolt locations. 24. Bring the piston in the No. 1 cylinder to TDC on its compression stroke. 25. Turn the stopper plate on the No. 1 tensioner clockwise and push in the tensioner plunger. 26. Remove the chain tensioner slipper. 27. Unscrew the idler sprocket shaft and remove the idler shaft, sprocket, and collar. 28. Remove the two chain vibration dampers. 29. Remove the No. 1 timing chain. Caution: Do not rotate the crankshaft while the No. 1 timing chain is removed. 30. Remove the crankshaft timing chain sprocket. 31. Compress chain tensioner No. 2 and lock it in the retracted position. 32. Unscrew the two bolts that secure the camshaft timing sprockets to the camshafts and remove them as an assembly. 33. Remove chain tensioner No. 2 and store it with the other components. 34. Repeat the process for the No. 3 timing chain and tensioner.

Carefully pry out the old crankshaft seal with a screwdriver, ensuring not to scratch the seal bore.

Remove the valve cover, timing belt, and intake camshaft, ensuring not to remove the exhaust camshaft or sprocket unless necessary.

Set the engine to TDC and remove the crankshaft pulley, ensuring to hold it securely while removing the bolts.

54. Remove all old RTV sealant from the gasket mating surfaces. 55. Install a new crankshaft oil seal in the timing chain cover. 56. Install a new O-ring on the left cylinder head. 57. Apply gray RTV sealant on the timing chain cover and indicated locations on the engine. 58. Slide the timing chain cover into place. 59. Install the timing chain cover mounting bolts and nuts, tightening them gradually and evenly. 60. Install and tighten the four oil pan bolts that go into the timing chain cover. 61. The remainder of installation is the reverse of the removal procedure. 62. Refill the engine with oil and coolant. 63. Reconnect the cable to the negative battery terminal. 64. Start the engine and check for leaks.