BMW 11318648732 Timing Chain

To start removing the timing system, a complex procedure should be carried out. That is, begin by taking away spark plugs and valve cover. Subsequently, remove crankshaft pulley, crankshaft front oil seal, drivebelt and oil pan. Make sure that the engine is at TDC No 1 cylinder and press back the chain tensioner using a special tool to lock it for oil pump drive chain. Locking tools are used for automatic or manual tranny models to keep flywheel from rotating and preventing crankshaft turning. Take out the centre bolt of the crankshaft and after this remove intake plus exhaust camshafts VANOS adjusting units. Turbocharger wastegate vacuum unit bolts and timing chain tensioner must be removed. Remove Allen-head plugs on the crankshaft pulley hub in order to free it up for extraction along with timing chain module guides Torx screws have to be taken put of place as well. Unscrew M7 (or M8 on some engines) bolts holding timing chain module to cylinder head and lift off module with chain and sprocket together. Note its orientation, detach if required from sprocket at this stage itself by positioning piston No 1 at TDC whilst counterbalance shaft gets locked up again through use of a special tool during installation stage Collar must face towards side of crankshaft where sprocket will be located when meshed with collar Lower into position so that timing chain with module can then be hung down over this end onto which new hub-retaining bolt has already been inserted Then torque down center bolt of hub while carefully locking flywheel against rotation or prevention Rotate engine two full revolutions clockwise: check that flywheel can still occupy positions Meanwhile just reverse procedure replacing gaskets seals aluminum bolts tighten all fasteners according to specified torque values fit drive belt.

The timing system is intricate and it should only be done by highly experienced people. Serious engine damage could result. If you are unsure of your own capability, a specialist in this field should be consulted before any attempt is made for this repair. Check and ensure that the work is correct prior to starting any machine. Removal, on the other hand, comprises removal of valve cover, crankshaft front oil seal, drivebelt(s), and auxiliary drivebelt tensioner. Tie down the engine at TDC for No 1 cylinder then take out the timing chain tensioner. Release the crankshaft pulley hub and make a tool to hold it in place. Unscrew and remove the bolt from pulley hub then draw out the hub from the crankshaft. Remove plugs from timing chain cover and take away all timing chain guides provided there are no problems encountered with its disengagement from sprocket. Detach VANOS adjusting units then lift up timing chain module together with chain plus crankshaft sprocket. In case of necessity conduct disengagement of the chain as well as removing it from such module. Installation involves making sure that No 1 piston still remains at TDC thus chaining can now engage with crankshaft sprocket while putting down timing module along with chain; get through sprocket using crankshaft pulley hub respectively by moving lower part below pulley first; push new retaining bolt of this item into place and torque accordingly - meanwhile fix new oil seal properly while fastening these chains; just like one way was removed gaskets will also need replacement same applies to seats being replaced while aluminum bolts tightened as per their specific torque values among other things Finally install drivebelt(s).

To start removing the timing system, a complex procedure should be carried out. That is, begin by taking away spark plugs and valve cover. Subsequently, remove crankshaft pulley, crankshaft front oil seal, drivebelt and oil pan. Make sure that the engine is at TDC No 1 cylinder and press back the chain tensioner using a special tool to lock it for oil pump drive chain. Locking tools are used for automatic or manual tranny models to keep flywheel from rotating and preventing crankshaft turning. Take out the centre bolt of the crankshaft and after this remove intake plus exhaust camshafts VANOS adjusting units. Turbocharger wastegate vacuum unit bolts and timing chain tensioner must be removed. Remove Allen-head plugs on the crankshaft pulley hub in order to free it up for extraction along with timing chain module guides Torx screws have to be taken put of place as well. Unscrew M7 (or M8 on some engines) bolts holding timing chain module to cylinder head and lift off module with chain and sprocket together. Note its orientation, detach if required from sprocket at this stage itself by positioning piston No 1 at TDC whilst counterbalance shaft gets locked up again through use of a special tool during installation stage Collar must face towards side of crankshaft where sprocket will be located when meshed with collar Lower into position so that timing chain with module can then be hung down over this end onto which new hub-retaining bolt has already been inserted Then torque down center bolt of hub while carefully locking flywheel against rotation or prevention Rotate engine two full revolutions clockwise: check that flywheel can still occupy positions Meanwhile just reverse procedure replacing gaskets seals aluminum bolts tighten all fasteners according to specified torque values fit drive belt.

Specific equipments and new parts are needed in order to perform this repair procedure, and it is necessary to read the whole procedure before starting to repair. Lack of special tools necessary when performing disassembly, removal or assembly of camshafts or camshaft adjustment units exposes the parts to prospect of breakage or, at the very least, the valves may bend due to contact with the crowns of pistons. During the procedure unless otherwise stated the crankshaft and all camshafts are secured against rotation by applying the BMW special tools. The best here is to remove the cylinder head cover and all spark plugs, the crankshaft seal if at the front and the drive belt tensioner. Change the position of the crankshaft and position cylinder 1 at the TDC firing position with the aid of the vibration damper bolt so that the intake camshaft lobe is up. By so doing, when cylinder 1 is at TDC, one will observe that the exhaust camshaft cams point upwards. To check camshaft timing is correct, there is an orientation by part numbers or code on both intakes and exhausts, in addition the camshafts should face upwards. Screw on special tools 11 8 535 to 11 8 531, using an M10 washer with a thickness of 6 mm between the crankcase and the short screw of the special tool 11 8 535. Place special tool 11 8 537 on the sealing cap and screw in special tool 11 8 534 to expel the vacuum pump sealing cap which has to be expelled diagonally. In case the transmission is removed, tighten the flywheel with tool number 11 9 260; if the manual transmission is used, screw tool number 11 8 180 on the transmission using the bolts marked 'A' tighten the bolt labeled 'B' For an automatic transmission, fasten the flywheel by using the tool 11 8 660 through the transmission bell housing slit. Insert your finger through the vacuum pump sealing cap opening and compress the timing chain with the chain tensioner to ease tension on the oil pump chain Finally set a suitable lock pin to the chain tensioner. Take out the center bolt and it is to be pointed out that the breakaway torque is 600 Nm (440 ft-lb) and a 3/4-inch drive socket/breaker has to be used in order to loosen it. The timing chain tensioner is then to be removed; the vibration absorber screws are then to be screwed in; and the hub on the crankshaft is pulled forward to be removed. Remove the connecter plugs found at the upper left of the housing and the lower right end of it and also , take out the chain guide mounting bolt at the upper left. Pop in special tool 11 4 280 and start with the center bolts on the front of the intake and exhaust camshaft adjusters and loosen and remove. Take out the intake and exhaust camshaft adjusters from the timing chain and place them aside and detach the chain tensioning rail mounting bolt at the at low right of the timing chain sprocket cover. Four bolts securing the timing chain assembly are on the front side of the cylinder head; dismantle by lifting the timing chain along with the timing chain assembly and crankshaft sprocket from the timing chain housing. Remove the timing chain from the ID and rail and crankshaft sprocket and fit a new timing chain. Align the crankshaft sprocket with the chain positioning the collar facing the engine, this is to ensure that the sprocket is assembled in the right way so that an engine is not ruined. Stretch the timing chain until the sprocket meshes with the chain guide and then fix the timing chain and the chain assembly into the housing with an appropriate tension of the chain. Bolt on the timing chain assembly and its rail together with its guide bolts and tighten in the correct manner. After engaging the crankshaft, fix a new bolt with the place for the crankshaft hub; then torque from the centred bolt using an angle protractor. Fit a new crankshaft seal; refit the camshaft adjustment units with the note that exhaust and intake units are not identical. Introduce the camshaft timing and tighten the adjustment unit mounting bolts; thereafter, fit the timing chain tensioner. Take out the locking tools and rotate the engine two full revolutions, adjust the camshaft timed if it is required. Finally the new sealing cap for the vacuum pump is fitted until it lies flush with the upper part of the crankcase, and the rest of the procedure can be said to be a reversal of the process of removal.

For the removal and installation of VANOS units and for timing of the camshafts, particular tools and processes are required, so one must go through the entire mathematics before beginning with repairs. Opening, taking out and reassembling of camshafts or VANOS units without proper tools often causes additional damage normally resulting in situation such as bent valves due to impact with piston crowns. During the whole process of exchanging the liners, the crankshaft and camshafts should be locked against rotation with the aid of BMW special tools only. Start by turning the engine off and taking out the key, then, take off the cylinder head cover and spark plugs. Turn the crankshaft so as to align cylinder one on top dead center firing position with the cylinder 1 intake camshaft lobe facing upwards. Intake with the aid of the mirror the exhaust camshaft lobe position, then unbolt and remove the timing chain tensioner with an oil collecting pan in place to capture any dripping oil. Lift the vehicle carefully and take off the splash shield, as well as the accessory belt. Loosen the vibration damper and the crankshaft front seal, then pull out the protector plug located in the lower left of the flange of the engine bell housing and fit the crankshaft lock through the bell housing flange hole to the flywheel hole so as to lock the crankshaft at TDC. Do not use them on models with automatic transmission to prevent confusion with the flywheel bore. Slip out the vibration damper hub with the counter hold tool and throw away the hub bolt. There are plugs on the timing chain housing and by unscrewing those remove the chain guide and tensioning rail mounting bolts while there is the special tool set to lock down the camshafts. Also, unbolt and take out the intake and exhaust VANOS units, and disengage the chain with the units, and then temporarily set aside. Raise the timing chain assembly with the crankshaft sprocket out of the timing chain housing and remove the timing chain from the guide and rail assembly and fit a new timing chain as well as check the conditions of the guide rails. Position the crankshaft sprocket to the chain with tooth ends facing each other, tighten the timing chain by stretching it far away from the tDC position and then slip this assembly into the timing chain housing while holding the chain stretched. Fit the timing chain assembly, rail, and guide bolts and tighten them, and then mesh the timing chain and the oil pump chain sprockets and then slide the vibration damper hub into the crankshaft. This is then tightened to final torque on the hub using hydraulic collapse nuts and special tools while seeking assistance. Replace the crankshaft front seal and fit the VANOS units with new bolts; there are two types of VANOS units. The chain tensioner should then be fitted into position, although if the tensioner has been reused, then a new sealing O-ring should be fitted also. Last of all, undo the locking tools and rotate the engine two full times, adjust the camshaft timing if required before rebuilding the engine.

Ensure camshafts are locked in TDC position using BMW special tool set 113240. Inspect timing chain sprockets, guide rail, and tensioner rail for damage, replacing any worn or damaged parts; if sprockets are replaced due to wear, also replace the chain. Install the primary timing chain to the crankshaft sprocket and hang the upper end from the exhaust camshaft. If necessary, replace the crankshaft front seal in the timing chain cover. To install the lower timing chain cover, clean the sealing surfaces, use new gaskets and a coolant pipe O-ring, remove dowel pins from the engine block, drive dowels into the cover until they slightly protrude, apply a small bead of silicon sealer to the corners where the timing cover meets the cylinder head and engine block, tap the cover into position until firmly seated, install all bolts hand tight including two Torx bolts from above, install the secondary chain lower guide, and tighten cover mounting bolts alternately and in stages. Install the oil pan with a new gasket, reinstall the crankshaft vibration damper, and ensure not to use BMW special tool 115180 to hold the crankshaft stationary when tightening the vibration damper mounting bolt; instead, have a second person hold special tool 118190 while tightening. Remove the crankshaft locking tool. Fit the top sprocket to the primary timing chain and install it on the exhaust camshaft, ensuring the pointer on the sprocket lines up with the cylinder head sealing surface. Position the sprocket so that chain slack is on the tensioner rail side, insert BMW special tool 114220 in the cylinder head, and screw in the adjustment screw until it contacts the tensioning rail and removes chain slack. Ensure the arrow on the upper primary sprocket lines up with the upper edge of the cylinder head, repositioning if necessary. Install and tighten down threaded locating studs in the end of the exhaust camshaft, then install the secondary chain tensioner on the cylinder head while keeping it compressed using BMW special tool 113291 or a suitable pin tool. Fit the exhaust camshaft splined sleeve, aligning the gap in the sleeve splines with the corresponding gap on the camshaft splines, and slide the splined shaft on the exhaust camshaft, ensuring the locating tooth fits into the spline gaps. Push the splined shaft in further to rotate the splined sleeve until the three threaded holes in the primary chain sprocket are centered in the splined sleeve's slots. Time the intake to exhaust sprockets using BMW special tool 116180, position the spline gap on the intake sprocket, and place the secondary chain on the sprockets, ensuring not to alter the position of the sprockets with respect to the chain when removing from the special tool. Slide the splined shaft onto the intake camshaft until approximately 1 mm of splines are visible, install the intake camshaft spring plate with the FRONT mark visible, and install mounting nuts finger tight. Insert sprocket mounting bolts on the exhaust side camshaft assembly, initially tightening to approximately 5 Nm and then backing off by half a turn. Fit the thrust spacer on the exhaust camshaft, install the spring plate ensuring the F mark is visible, and if not, install the spring plate with the convex side facing forward. Install the exhaust camshaft impulse wheel, aligning the pointer with the top edge of the cylinder head, and install mounting nuts finger tight. Pull out the exhaust camshaft splined shaft to stop, press down on the secondary chain tensioner, and remove the tensioner lock-down tool. Preload the primary chain by tightening the adjusting screw on BMW special tool 114220 to the specified torque, and preload the exhaust camshaft spring plate by pressing on the impulse wheel while tightening the mounting nuts finger tight. Install BMW special tool 116150 to the front of the cylinder head timing case, install nuts finger tight, then tighten down uniformly until the special tool is in full contact with the cylinder head. Ensure gasket material is removed from the face of the cylinder head, clean the sealing face, and keep it free of oil. Secure the camshaft sprockets and impulse wheels by tightening mounting screws on the exhaust camshaft impulse wheel to approximately 5 Nm, tightening mounting nuts on exhaust and intake sprocket assemblies to approximately 5 Nm, and torque down mounting screws and nuts to final specifications. Remove the crankshaft locking tool, allowing the crankshaft to no longer be secured in TDC position, and remove camshaft locking tools from the cylinder head. Turn the engine over twice in the direction of rotation until cylinder 1 intake and exhaust camshaft lobes face each other, secure the crankshaft in TDC position with BMW special tool 115180, and place BMW special tool set 113240 over camshafts to measure clearances, noting that due to VANOS unit tolerances, the intake side of the special tool may be up to 1 mm above the surface of the cylinder head, which is normal. Otherwise, reset camshaft timing. Remove BMW special tool 116150 from the front of the cylinder head, reinstall the VANOS unit, remove BMW special tool 114.220, and reinstall the primary chain tensioner. Install the intake camshaft oil baffle, check for correct seating of half-moon seals in the back of the cylinder, and use a small amount of sealant at corners of half-moon cutouts, sealing corners in front of the cylinder head at the VANOS unit. The remainder of assembly is the reverse of removal, ensuring to secure all coolant hoses, thermostat housing, and engine coolant drains, install a new engine oil filter and oil, refill and bleed the cooling system, and use a scan tool to check VANOS operation with the engine idling.

Install the crankshaft locking tool through the bell housing into the flywheel to lock the crankshaft at TDC.

Next, remove the coolant pump pulley, engine covers, and cylinder head cover, followed by the spark plugs, which should be plugged to prevent debris from entering the engine.

Can't get the kit have to buy all individual items.