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no 1 piston tdc
the cam lobes for no 1 piston should in such a position so that a slight turn of the cam shaft one way makes the exhaust start to close and the inlet start to open or the other way the inlet start to close and the exhaust start to open
this is known as valve rock or valve overlap and occurs when the cam shaft is properly timed to the tdc position of the piston
for a twin cam engine the cam lobes position will be the same operation just that the inlet cam rock will be for the inlet cam and the exhaust cam rock will be for the exhaust cam
your honda sprocket have 1 slot in of the gear.if you c that.you have facing that two slots.and u look the plastic cover theres arrow or you see your head level your slot or timing mark.you dont problem crankshaft bcoz they have timing mark.
Are you needing the twin independent variable cam timing info or is this a cam replacement initial cam timing setting? the variable valve timing itself is dependent upon the part design, and is usually controlled by oil flow (causing the timing to change hydraulically and seems transparent to the driver). However, when replacing the cam, the timing is more of a position issue using the marks on the engine and camshafts to make sure the shafts are in the proper position.
If this is for a replacement, use the marks on the block ensuring the current valve position is the proper in relation to piston position (otherwise your pistons will punch the valves and blow the head)
its a taper fit so no markings on the gear what you do is too look on the cam shaft at the rear as i seem to remember a slot but if this is the renault engine then the slot is at a angle and not horizontal with the head ,cannot remember more but i seem to remember a mark on a cam cap housing as well ,or was that the diesel ?? Sorry but iam getting old a losing the plot as i do so many types of vehicle but a quick check is to check the position of the cams on no1 cylinder ,the rest will follow of course ,make sure the pistons are down a bit so as not to hit the valves back off a bit anticlockwise then turn the cams so the inlet is up and to the left and just moving away from the tappet as its just closed and the exhaust up and to the right then look for some indication as to the timing marks
not sure what sort of engine this is as to weither its a diesel or a petrol but most engines have the valve timing marks on the back of the cams their is a slot that has to be horizontal with the head but some VW engines have it at a angle so always check the valve positions to be sure and then crank engine over by hand 360degrees to make sure it all clears the inlet valve should be pointing up and to the left and the exhaust up and to the right
depends what engine as to where the timing marks are to be honest ,and what you mean by checking the timing ,if you mean just the spark then is pre determined by the crank sensor so its not adjustable as such without access to special diagnostic software ,but if you mean the valve timing then even with no timing marks its relatively easy ,take no1 spark plug out then turn engine till the piston come to the top ,i use a long thing screwdriver for this down the plug hole ,then remove the rocker covers over no1 cylinder and look at the valves and the inlet should have just closed and exhaust is getting ready to open ,doesnt matter on make or number of cylinders this will work then with engine in this position you can look for any alignment marks like a slot on the back of the cam is level with head face or a notch on the cam that lines up with a slot on the cam cap or whatever system your engine uses ,but no matter what make or engine it is they work on the same principle from a Ford T to a jaguar or a lotus including a radial airplane engine .
easy to do ,no1 cylinder at tdc no1 and single camshaft turned till the cam lobes are where inlet has just closed and exhaust it about to open but both valves are closed ,then bring piston up to the tdc position ,pump set to spill time at no1 injector then you should see the correct marks ,turn engine over 360? by hand to ensure valves clear
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
do it by appliance of science ,TDC no1 then exhaust and inlet valves on the back of the cam so they closed ,now some vehicles have a paint mark on the inlet and exhaust marks on the gearwheel well these paint marks line up so exhaust cam wheel it says inlet so this p?ints to inlet cam wheel and the inlet cam wheel that says exhaust points to exhaust (twin cam per head ) have a play and if you cannot do it then post and i will answer tomorrow as i have a date tonight