360 What is this moving thing behind the crankshaft key?

That's really interesting! BUT...You are supposed to have a spacer installed before doing this operation!

 

Good way to chew up the key and keyway fit

 

IDK what normal is but with the spacer installed that movement is not possible. This is the view from underneath with spacer installed.

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[QUOTE="mahlerfree]

It moves in and out as I rotate the crankshaft. Is it supposed to do that? Something's wrong?[/QUOTE]

Yes it does. You've removed the component limiting forward/aft movement on a helical gearset.

Is it supposed to do that? No

Somethings wrong? Well no all things considered

 

You are not supposed to remove the crankshaft pulley and then do that turning operation. That is the gear that mates with the two gears which turn the cam sprockets. The crank pulley occupies that space and keeps the gear from moving in and out like that. Put the pulley back before you do any cam timing maneuvers.

 

I also did the same thing without putting in a spacer. I'm totally lost why the spacer is needed.

Have we done some damage? Anyway to check?

#10 is OIL PUMP CONTROL GEAR

 

From what i see on the diagram the end of the crankshaft has a keyway machined into it, then the key (9) is fitted and then the gear (10). The accurate position of the gear teeth relies on the precision fits off all these items as this gear is the initial drive for the cam belts on both banks.

By allowing the key to twist you run the risk of damage to the key, also the keyway in the crank. Keys are usually a light interference fit in the keyway, so you need the end of a screwdriver and a light hammer to remove. Get any slack in these and you risk them damaging each other, plus the keyway in the gear.

I am surprised to see the key moving that much, r u sure it is not worn- have a look at the sides of it to see if any signs of a step where it may have twisted. Is it a tight fit on the crank. Measure the width where it goes i the gear and the crank, should be the same

I used to hand make shaft keys if we did not have one, by rough machining in a lathe and then filing to fit . Takes a bit of time through

 

The 2 big gears number 11 are the driven gears, the gear with the arrow is the drive gear from the crank.
You will see that the size ratio of the drive to driven gear is about half size. This is a 4 stroke engine so the camshaft rpm is half the crankshaft rpm, hence the difference in gear size. These driven gears provide the drive to the cam belt and up to the cam shafts