Say I've got the cam and crank pulleys pinned and the timing belt removed. When I loosen the single centre bolt to allow the cam pulleys to rotate they are very stiff. What is the proper procedure for removal of the cam pulleys so that I can clean up the contact surface?

Just undo the bolt all the way and pull the pulleys off? Does this have a chance of removing the bit of metal that connects the pins to the camshafts and thus destroying the timing?

Ok. Just a bit worried because last time I did the timing belt the cams were very springy. I have a feeling when I pull off the pulley the camshafts are going to spring around abit.

Not very tight. Are you saying that if the timing is correct then the cams should be at rest and not spring loaded?

This can cause all kinds of problems.

However, provided you're careful you'll be fine.

You will need to pin both pulleys to make sure the timing is correct and then loosen and remove both cam pulley bolts. Remove the pins. The pulleys will then pull off. The metal part behind will also come off and most likely, the inlet cam will spring backwards slightly. This isn't an issue at all as all it's doing is slightly closing the two inlet valves which are open on cylinder 2.

The exhaust cam *should* stay put.

Now, you can remove the metal part from each pulley and I usually wipe them both clean and drop a single drop of engine oil in the pulley and refit the metal part. Now it is nice and slick and easy to move.

Refit the exhaust cam pulley and pin up, do the bolt up a few threads. Then, refit the inlet pulley, and you will need to tighten the pulley bolt up until the cam wants to move forwards. At this point, turn the cam (about 10 degrees) to make the pin hole line up again, refit pin and loosen pulley bolt.

You are now ready to fit the belt with two freed up pulleys.
However...

If the exhaust cam didn't stay put - then it will have sprung forwards (rare). In this instance, you will need to turn the cam anti-clockwise to achieve the same result you had with the inlet pulley.
You can't just turn the cam 360 degrees clockwise with the bolt as you will bend valves.

It's annoying, but the most effective way I have found to do this is to remove the exhaust cam cover and use mole grips on a rough (webbed) part of the shaft and turn it backwards the 10 degrees (roughly) it needs.
If you have a special cam pulley tool, you could refit the pulley and then turn the pulley anti-clockwise using the tool to achieve the same outcome.

As I say, it's rare the exhaust cam springs in the 'pinned' position but I have known it happen.

Hope this helps,

Stan.

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