Modern Timing Components

Experts say it’s important to follow the OE design. Also, make sure you have the engine manufacturer’s instruction manual and carefully follow the timing set manufacturer’s installation instructions. There are fewer and fewer three-piece timing sets coming out at the OE level today; we’re now seeing up to 15 pieces in a set for a DOHC application, for example.

On some of these sets, the windows on the cam sprocket’s timing sleeve play a role in actuating the valvetrain. Because the requirements of each engine are now so specialized, says this industry spokesman, rebuilders must be certain they are replacing the OE set with a technology that mirrors the OE design, and this is true for tensioners, guides, rails and other components as well.

Says another technical expert, the biggest change in timing sprockets has been a move from machined cast iron to sintered (powdered metal). Most sintered sprockets require no machining which eliminates extra manufacturing steps and also produces closer tolerances from one part to the next.

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