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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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SERVICE INFORMATION A revised service procedure for the engine front cover/timing chain has been adopted for the GA16DE. It is no longer recommended to remove the cylinder head when removing the timing chain/front cover(s). Utilize the following steps when servicing the front cover, timing chain, guides or tensioner(s) PARTS INFORMATION Caution ^ After removing the timing chain, do not turn the crankshaft and camshaft separately or the valves will strike the piston heads. ^ When installing chain tensioners or other sliding parts, lubricate contacting surfaces with new engine oil. ^ Apply new engine oil to bolt threads and seat surfaces when installing the camshaft sprockets and the crankshaft pulley. ^ Do not spill engine coolant on the drive belts. ^ Please refer to the Service Manual for the correct tightening torque. Removal 1. Set # 1 piston at TDC on its compression stroke. 2. Remove the spark plug wires. 3. 4. Remove the rocker cover (see Figure 1). Remove the coolant reservoir tank with bracket and reposition it for clearance. 5. Support the engine with a suitable jack. 6. Remove cylinder head front mounting bracket. 7. Remove engine front mounting, then the engine front mounting bracket. 8. Remove cylinder head front cover. 9. Remove the upper chain tensioner (see Figure 2). 10. Wipe off the links of the upper timing chain next to the timing marks on the sprockets. Put paint marks on the timing chain, matching them with the timing marks on the cam sprockets and idler sprocket (see Figure 3) 11. Remove the four (4) front cover to cylinder head bolts. 12. Remove side and lower engine compartment splash covers. 13. Remove the accessory drive belts. 14. Remove the crankshaft pulley. 15. Drain coolant by removing the cylinder block drain plug and opening the radiator drain cock (Refer to MA section of the Service Manual). 16. Drain engine oil. 17. Remove intake manifold support of engine front side. 18. Remove power steering pump, pump bracket and tension rod. Position pump aside for clearance.

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2. Loosen power steering lock bolts and nuts accordingly and remove tension from Power Steering (P/S) and/or Air Conditioning (A/C) compressor drive belt. 3. Remove P/S and/or A/C drive belt. 4. Loosen generator mounting bolts and adjusting bolt. 5. Remove generator bolts. 6. Remove water pump pulley. 7. Remove crankshaft pulley and timing belt guide plate. 8. Remove upper and lower timing belt covers. 9. Turn crankshaft so that timing mark on timing belt pulley is aligned with timing mark on engine.10. Check that “I” mark on intake camshaft pulley is aligned with mark on cylinder head cover and “E” mark on exhaust camshaft pulley is aligned with mark on cylinder head cover. NOTE: Do not move camshaft or crankshaft once timing marks have been correctly positioned. 11. Loosen tensioner pulley lock bolt. 12. Protect timing belt with a rag. 13. Remove tensioner pulley. 14. Remove timing belt. NOTE: Mark the direction of timing belt rotation (on the timing belt) for proper reinstallation. INSPECTION NOTE: Never forcefully twist, turn inside out or bend timing belt. Do not allow oil or grease to come in contact with timing belt. 1. Replace timing belt if it is contaminated with oil or grease.

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Ensure camshaft and crankshaft timing marks are still aligned. Outer marks on sprockets should be aligned with rocker cover surface. Verify timing chain timing mark alignment, if necessary. See Fig. 2 . Install timing belt tensioner pulley. Install timing belt. If reusing old belt, ensure belt is installed in original direction of rotation. 2. Loosen timing belt tensioner bolt, allowing tensioner pulley to contact belt. Tighten timing belt tensioner pulley bolt. Rotate crankshaft one turn clockwise. Realign camshaft and crankshaft timing marks. 3. Adjust timing belt tension until .15-.24″ (4-6 mm) deflection is present midway between idler pulley and camshaft sprocket, with a force of 4.4 lbs. (2 kg) applied to belt. 4. Rotate engine clockwise 2 revolutions. Ensure timing marks are still aligned and proper belt tension still exists. Install timing belt covers. Install crankshaft pulley. To complete installation, reverse removal procedure. Adjust drive belt to proper tension.

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Special Precautions Special Precautions Disconnect battery earth lead. DO NOT turn crankshaft or camshaft when timing belt removed. Remove glow plugs to ease turning engine. Turn engine in normal direction of rotation (unless otherwise stated). DO NOT turn engine via camshaft or other sprockets. Observe all tightening torques. Check diesel injection pump timing after belt replacement. Removal Removal 1. Support engine. 2. Remove: Air filter and air intake hoses. Auxiliary drive belts. RH engine mounting. Vacuum pipe bracket. Timing belt upper cover [1]. 3. Turn crankshaft clockwise to TDC on No.1 cylinder. Ensure crankshaft sprocket timing marks aligned [2]. 4. Insert M6 x 1,00 bolt in camshaft sprocket and M8 x 1,25 bolt in injection pump sprocket to lock sprockets in position [3]. NOTE: If locating holes not aligned: Turn crankshaft one turn. 5. Remove: Crankshaft pulley (4 bolts). Timing belt lower cover [4]. 6. Slacken tensioner bolts [6]. Remove tensioner spring [5]. 7. Move tensioner pulley away from belt. Lightly tighten bolts. 8. Remove timing belt. Installation Installation 1. 2. 3. 4. 5. Use crankshaft pulley to check TDC marks aligned [2]. Ensure locking bolts located correctly [3]. Fit timing belt in clockwise direction, starting at crankshaft sprocket. Ensure belt is taut between sprockets. Temporarily fit crankshaft pulley. Ensure timing marks aligned [2]. Fit tensioner spring [5]. Corsa-B/Corsavan/Combo: Slacken tensioner bolts [6]. Allow tensioner to operate. Remove locking bolts [3]. Tighten tensioner bolts to 19 Nm [6]. Turn crankshaft slowly two turns clockwise. Ensure timing marks aligned [2]. 6. Astra-F/Vectra/Cavalier: Slacken tensioner bolts [6]. Temporarily fit crankshaft pulley. Remove locking bolts [3]. Turn crankshaft 60° anti-clockwise (against normal direction of rotation) [7]. Tighten tensioner bolts to 19 Nm [6]. Turn crankshaft slowly two turns + 60° clockwise until timing marks aligned [2]. 7. 8. 9. 10. 11. Ensure timing marks aligned [2]. Ensure locking bolts can be inserted in sprockets [3]. If not: Repeat tensioning procedure. Remove crankshaft pulley. Fit timing belt lower cover [4]. Fit crankshaft pulley. Tighten bolts to 20 Nm. Install components in reverse order of removal.