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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
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
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
During most engine rebuilds, a completely new timing assembly should
be installed. If wear exists on any component, replacement of the entire
assembly is necessary. Wear in the chain, gears, or sprockets means a
timing lag, which results in poor engine performance.
The timing chain or belt is generally installed with the gears in
their correct positions. Before installing a new chain, soak it in oil. OHC (Overhead Cam) Engines
Some OHC engines use a chain drive; others use a belt drive. Removing
the cover on some OHC engines that have timing chains is more
difficult, because the cover often fits between the oil pan and the
cylinder head. There are special procedures for replacing cam timing
components in these engines.
Before a chain repair job, perform a leakage test on non-freewheeling
engines to check for bent valves, so that an accurate repair estimate
can be made. OHV (Overhead Valve) Pushrod Engines
On many OHV pushrod engines, the crankshaft sprocket is installed on
the crankshaft nose and the crankshaft is rotated to position piston #1
at TDC. At this point, a mark stamped onto the crankshaft sprocket is
pointing directly upward (toward the camshaft).
The camshaft sprocket is then temporarily bolted to the cam and used
to rotate the cam until a mark stamped on the cam sprocket is pointing
directly downward (toward the crankshaft). The sprocket is then removed
from the cam (without allowing the cam to rotate).
The timing chain is looped over the cam gear, the mark on the cam
gear is positioned directly downward, and the chain is looped around the
crankshaft sprocket. When the cam sprocket is attached to the cam, the
timing marks on the crank and cam sprockets should be pointing toward
one another. NOTE THIS IS FOR 2WD 4.0
If the ignition timing was out 90 degress it would not run. Are you sure you are on Number 1 cylinder, Number 1 is not always at the front of the engine. Try connecting the timing light to number 4 and see what that does to the timing marks