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I guess in theory one could just swap out the belt without placing everything on their marks. But would caution against that for two reasons that I can think of, one since the cams are under spring pressure who is to say a cam doesn't turn a bit while you are not looking at it. And if it did actually move, then you would have even more difficulty finding the factory marks without a timing belt in place. The other is the old belt will have stretched, not much, a couple of mm's maybe, so you could put a new belt on and move a pulley a little to for a tight fit and be moving it away from actual mark. It would be well worth the effort to find the marks on all three timing pulleys.
DanR '94 964 343,000 miles (109,000 on the new engine)
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DanR
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