Camshaft advanced with timing chain off

[Rob13]

**Please someone help me can’t find information on how to do this anywhere ** was changing the timing chain set and the camshaft moved forward with chain off. Now the timing marks do not line up. How do I line the marks up without messing up anything? It’s a 2001 3.0

 

[pjtoledo]

the dot on the cam gear is at the bottom, 6 oclock. the dot on the crank gear is at the top, 12 oclock so they are facing each other.

turn either cam or crank with whatever tools are handy, usually turn the big crank pulley by hand, it will stay where you put it. the cam can get finicky and wants to jump around, hold with slip-joint pliers or whatever.

 

[adsm08]

It is important to note, and I think more to the point of the OP's question, that the 3.0 Vulcan is a non-interference engine. You can spin the cam and the crank a full rotation each with the timing chain off and not damage anything.

As pjtoledo said, it really is just a matter of putting the gears on and making the dots point at each other.

 

[Rob13]

So I can move the cam and crank without a problem. Thanks. All I see every where is when doing the timing don’t let them move. Nowhere could I find anything saying what to do when they move.

 

[adsm08]

So, ideally you won't let them move at all with the belt or chain off so that you don't lose your correct timing. On an interference engine you still have some allowable movement. There is usually a tool that goes over the end of the crank and lines up with a mark or pin on the engine, and when placed correctly the pistons will all be below TDC, so if the cam jumps a little, like what happened to you, which is normal, you won't bend valves.

But on all pushrod engines that I familiar with, you have a condition called non-interference, which is where the engine is built so that with the valves fully open and the piston at TDC they still won't touch and so you don't have to worry about it.

All engines should be non-interference, but I am too smart to be a design engineer, so they aren't.