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1342 or 1243 ,not sure about timing marks for belt as my all data doesnt have this information ,remove spark plug no1 cylinder use a long screwdriver to locate TDC then look at valves and no1 cylinder should have cam lobes pointing upwards and outwards one to the left a bit and one to the right a bit ,now look for some timing marks ,could be on the back of the cam a slot that has to level with head housing .some vehicles have white lines on the back of the timing belt ?' renault but look for a slot on the back of the cam thats another favourite
I have attached to where you align the notch for the cam gear. The harmonic balancer has a notch on it, which you align to the "0" on the lower cover. The belt has alignment marks on them normally crank gear is the dotted line and the cam will be the solid line. Don't reuse an old timing belt of you removed it without marking it first. You should have aligned the gears to there timing spots prior to removing the belt Be very careful if you have to rotate the cam or crank the Pistons can touch the valves and cause damage. Hope this helps.
right back to basics here as i havent done one before but remove a spark plug on no1 cylinder then bring the piston done to about halfway then remove the rocker cover and look at the cams on no1 now turn till inlet is closed and cam is pointing up and to the left and the exhaust is up and pointing to the right ,now look at the back of the cam on the end for a slot which will be horizontal with head or a little cut out on a cam cap which will line up with mark on the cam ,this is the two maain types of timing setting for the cams although some engines have 8mm hole in a cam gear spoke (peugeot) which lines up with a hole in the head and you peg it .after finding the cam position you bring the piston on no1 up to the TDC ,this is achieved by a long thin screwdriver down the plug hole then fit the belt tighten the tensioner and crank engine with a rachet on the front pulley bolt 360degrees to ensure the valves clear .Some engines have a special tool which goes in a bolt hole after removing the blanking bolt to locate TDC ,which is normally in line with the crank but this is a renault and the ford focus which is at the back of the engine .
polo 1.6 not a problem ,right use a long thin screwdriver to locate no1 TDC then remove the rocker cover and look at the valves and the positions this is a single cam engine so with no1 at tdc look at the valves and see the positions and what you should see is inlet just closed and pointing to the left and the exhaust pointing in much the same position to the right ,now if this engine is the one iam thinking of then the timing mark is on the belt and it wears off ,you fit a new belt ans on the new belt are the timing marks that have to line up on the bottom pulley and on the cam ,its the system porsche engine with a alloy rounded sort of rocker cover ,now how many of these have i done and i still dont remember every type i work on ,comes with old age i suppose ,anyway with the cover off check the valves and if i remember rightly their is a square sor of limp on the cam just behind no1 cylinder and this lines up with a sensor or something on the head casing at the back of the engine have a good look first before you move anything though we do not want crunched valves ,if touching the cam belt for any reason always turn engine round twice on the bottom pulley by hand with all the plugs out so you know your not hitting anything .These engines do like a nice head gasket though every 120.000kms or so ,never mind the specs like new head bolts use the old ones and dont forget to squeeze the oil out of the hydraulic tappets ,grind the valves in a bit clean the ports and away it goes for another few years trouble free ,i always clean the head and block face up with a flat bed sander and medium grit paper with oil on it ,dont go mad on the head with it though.I normally get about one a month to do as it is a weak spot on this type of engine as they do go between cylinders or they leak oil out the side of the head which is a vehicle test failure
There are marks on the crank gear and the cam gears that line up to marks on the new timing belt. An old belt might not have the marks any more because of age. Therefore a new belt might be necessary to be sure of this.
Sorry i do not know off hand where the marks are but i will explain how to do it without marks ,firstly a few spots of white paint before you start makes sanse ,anyway start by slackening the camshaft retaining caps so the all the valves are closed ,take out no1 spark plug and using a nice long thing screwdriver in the plug hole locate TDC ,then look on the flywheel or the front pulley for some timing marks ,now a good clue here is that most engine have the crankshaft keyway pointing to the top of the engine --most but not all --- then move the crank back about 20? so pistons drop a bit but make sure you mark crank before dropping it back though .then look on the cam or cams if a twin cam ,and now tighten cam caps again then turn over cams till no1 cylinder has the valves closed on both inlet and exhaust with exhaust just about to open and inlet has just closed .then bring piston up to mark and fit belt --away you go brmmm brmmmm .simple isnt it .when you get the cam right look for a slot on the back of the cam or a sensor on cam lobe aligning up as this will no doubt be your timing mark ,when found white dab of paint for next time
didnt you paint some marks on?? ,crank TDC can be found by taking no1 plug out and use a stray to locate TDC then look on back of cam with rocker cover off and look for a flat on the back of the camshaft ,or no1 cylinder valves closed and no4 on the rock
to check the valve you need a compression tester, or the tool to blow compressed air into the cylinder. to check the belt there is a black plastic cover at the front of the engine. there are two ten mm bolts that secure it remove them and pull the cover out, or over enough to get a good look at the timing belt. if the belt looks good check it for tension. these belts should have no slack