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As long as the timing marks on the cams and the crank are correct and the chain is the correct length. And the chain tensioner is set correctly, the chain doesn't need to be marked.
There should be timing marks on the cam gears which, with a new chain from Nissan, will line up with specially colored links in the timing chain at Top Dead Center. This forum post goes into a bit more detail: Timing marks on the cam chain
You want to wipe off the links of the lower timing chain next to the timing marks on the sprocket and put paint marks on the timing chain matching them with the timing marks on the idler sprocket and crankshaft sprocket.
I'm assuming that you are talking about 1989 Nissan Truck 4WD 3.0L FI 6cyl.
In this models, the Z24i and KA24E engines do not use the pin counting method for finding correct valve timing. Instead, set the timing chain by aligning its mating marks with those of the crankshaft sprocket and camshaft sprocket. The camshaft sprocket should be installed by fitting the knock pin of the camshaft into its No. 2 hole. On the Z24i engine, the No. 2 timing mark must also be used.
Excatly, what is the problem? Adjuts timing procedure?
There is 3 marks on the timing chain, 2 are exactly 16 links apart and
the other is 22 from either of the 2. The engine should be at top dead
center. Line the 2 (16 apart) marks with marks on your cam gears and the
3rd with your crank gear. Torque cam bearings to 100 inch lbs.
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