1 Remove the fan clutch and fan assembly, the fan shroud, and the accessory drivebelts. On B230 engines, also remove the water pump pulley. 2 Unbolt and remove the camshaft drivebelt cover.(On B230 engines, just remove the top half of the cover.) 3 Using a wrench on the crankshaft pulley center bolt, bring the engine to TDC, No 1 firing. This is indicated when the mark on the camshaft sprocket is in line with the mark on the camshaft cover or the drivebelt backplate. At the same time the marks on the crankshaft sprocket guide plate and the oil seal housing will be in line. (The pulley mark cannot be used even if the pulley is still in place, since the timing scale is on the drivebelt cover.) Although it is not critical, the position of the auxiliary shaft sprocket timing mark should also be noted (photos). 4 On B230 engines, remove the starter motor or the flywheel bot- tom cover plate. Have an assistant jam the ring gear teeth, then loosen the crankshaft pulley bolt without disturbing the set position of the crankshaft. Remove the bolt and the pulley, then remove the lower half of the camshaft drivebelt cover. 5 On B23 engines, if the crankshaft pulley was not removed with the accessory drivebelts, remove it now. 6 Loosen the belt tensioner nut. Pull on the belt to compress the tensioner spring. Lock the tensioner in this position, either by tightening the nut again or by inserting a nail or similar into the hole in the tensioner shaft (photos). 7 Mark the running direction of the belt if it is to be re-used, then slip it off the sprockets and tensioner roller and remove it. Do not rotate the crankshaft, camshaft or auxiliary shaft with the bolt removed. 8 Spin the tensioner roller and check for roughness or shake; replace if necessary. 9 Do not contaminate the drivebelt with oil, nor kink it or fold it sharply. 10 Before installing, make sure that all three sprockets are in the correct positions. Slip the belt over the sprockets and around the roller, observing the correct running direction if the old belt is being re-used. 11 Recheck the alignment of the sprocket marks, then release the belt tensioner by loosening the nut or pulling out the nail. Tighten the tensioner nut. 12 On B230 engines, install the drivebelt lower cover and the crankshaft pulley. Make sure that the dowel (guide pin) on the sprocket engages with the hole in the pulley. Jam the ring gear teeth and tighten the pulley bolt to the specified torque. Install the starter motor or flywheel cover. 13 On all engines, rotate the crankshaft two full turns clockwise. Stop at TDC, No 1 firing, and check that the various timing marks still align. Loosen and retighten the tensioner nut. 14 Install the drivebelt cover (or the top section), then install the accessory drivebelts, pulleys, fan etc. 15 Run the engine to operating temperature, then switch it off. Bring the engine to TDC, No 1 firing. Remove the access plug from the front of the drivebelt cover, loosen the tensioner nut once more and then retighten it. Install the access plug. 16 If a new belt has been installed, repeat paragraph 1 5 after approximately 600 miles (1000 km). Check out some other tips from Justin Seiferth
