I have an interest in replacing my valve stem seals on the 603 engine.

There is supposed to be a special tool to hold the timing chain in place while you turn the engine over - it is described as a camshaft gear without much of the camshaft, so you can access the valves that are normally obstructed below the cams. The idea is that you have to turn over the engine to get each respective piston to top dead center as you work on the valves for that cylinder - so the valves don't drop.

Does anyone have that tool, or is there a source of old camshafts that can be sawed off and used in its place? Do you have to break the chain to get the camshaft off in the first place, and so essentially have to do a new timing chain at the same time as valve seals?

My interest in doing the job is not all that high considering the hassle...... I'm not using much oil at all.

Ken300D