the marks have to be pointing each other in the center of the gears
Both, cranshaft to camshaft sprocket, belt, camshaft sprocket to cams, chain.
On a 2001 Smart Car, the timing marks for the timing chain are located along the cam sprocket and the edge of the links. They must be matched together to ensure proper initial timing.
take the timing chain cover off and with a wire hanger pull it from the bottom to the top sprocket so it doesn't fall.
The timing marks on a '97 Dodge Stratus are located on the timing chain and the camshaft sprocket. They must be aligned to set the initial timing.
It has 3 timing chains and an idler sprocket
Pull the head and remove cover on clutch side of motor loosen and rotate mortar pull chain out threw bottom with sprocket
Behind the harmonic balancer at the bottom of the engine, behind the timing chain cover.
right in front of the crankshaft pulley beside the oil filter....is the timing chain cover(two timing chain...#1 on the crankshaft sprocket, #2 on the cam sprocket. Need to lower the engine to access the timing chain. Timing chain, not necessary to be replace, unless they broke loose.Other than that it remain with the life of the van.
The timing marks for a 2002 Ford Explorer are located on the timing chain and cam shaft sprocket. They must be aligned with each other to set the initial timing.
Fig. 11 Valve Timing MarksRemove engine front cover as outlined previously.Remove crankshaft oil slinger.Crank engine until timing marks on sprockets are in alignment, Fig. 11.Remove three camshaft to sprocket bolts.Remove camshaft sprocket and timing chain together. Sprocket is a light press fit on camshaft for approximately 1/8 inch. If sprocket does not come off easily, a light blow with a plastic hammer on the lower edge of the sprocket should dislodge it.If crankshaft sprocket is to be replaced, remove it with a suitable gear puller. Install new sprocket, aligning key and keyway.Install chain on camshaft sprocket. Hold sprocket vertical with chain hanging below and shift around to align the timing marks on sprockets.Align dowel in camshaft with dowel hole in sprocket and install sprocket on camshaft. Do not attempt to drive sprocket on camshaft as welch plug at rear of engine can be dislodged.Draw sprocket onto camshaft, using the three mounting bolts. Tighten to specifications.Lubricate timing chain with engine oil and install cover.
right behind the top sprocket of the timing chain
Generally, for most single cam engines, there is a dot or mark on the cam sprocket and a similar mark on the crank sprocket. Point them at each other. the timing marks on the crank and cam sprockets must be lined up with marks on the timing chain in an overhead cam engine