On the intake cam use the middle mark in between the big one and the other small one on the exhaust cam use the use the smallest mark farthest away from the 2 small marks on the same tooth. line those 2 marks up on the same tooth in the middle.
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generally to be honest with you ladies and gentlemen,dont trust any marks especially old vehicles,if youre mechanic you need to knw timing valve sequential by heart so that you can use marks as a cross check after everything installed. Example vw cam pulley comparing to an Audi cam pulley looks similar,same diameter even teeth gears are the same but differs in mark,the other mark at 12 oclock and the other at10 oclock.
Hi Jan, The timing marks are as follows. The cam gear has a hole drilled through and this must be lined up with a punch mark on the cam bearing cap behind it. We find a flash light and a mirror are good tools to use. The crank shaft is on the oil pump housing and slightly raised. It is past TDC and lined with a notch in the crank pulley.Regards John
simple to figure that out . the key ways are always up on camshafts. it allows for them not to fall out when assembling the engine . so use the balancer to determine tdc (top dead center on cyl one) and make sure both keys are straight up . (just loosen the cam retainer nuts and look to see what set of marks they line up with and dont forget t re-torque them to factory specs somewhere between 22 and 28 ft lbs but not a lot more) , google the specs up to be sure
If u cannot obtain the itming marks, u mite have to time the engine by first pricnciple. Ensure that #1 cylinder is @ TDC (compression stroke). Install the camshaft making sure that the cam lobes for #1 cylinder are on the lower side and not on the tip of the cam. Also when installing the distributor, ensure that it's set to spark @ #1 cylinder. In modern day vehicles, the distributor can only be fitted one way so theree is no need to time the ignition timing via distributor. If this is too much, u can check the crankshaft & camshaft sprocket for distinct timing markings . This should be checked when the components are clean