Nope there are a lot of very fine splines but no indexing point. The older 617's had them but not the newer 603's. The pump's only indexing mark is the raised tab accessible through the plug in the side. When centered relative to that hole it indicates start of injection for the first cylinder. Really the most important thing to consider when installing the timer is to make sure there is no slack in the chain between the timer and the crankshaft gear when the timer is installed.