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End Wrench Subaru: T-Belt Time All About OHC Timing Belts.pdf

June 11, 2008 · Filed Under Subaru  · Tags: , ,

Pushrod-actuated valves may have been simple, but there was no way they could ever offer the kind of performance available from SOHC and DOHC designs.

Way back in the mid-’60s when we first heard of the idea of driving a camshaft with a rubber belt, we thought the idea was radical, maybe even implausible. It takes quite a bit of force to turn a cam, after all, and isn’t perfect synchronization absolutely critical? How could a belt possibly hope to achieve the precision necessary? Since time immemorial, engineers had used gears or chains and sprockets, which were relatively rigid and accurate. Why mess with that and introduce such an incredible departure from tradition?

Well, there were lots of good reasons, which we traditionalists were just going to have to accept. First, those belts aren’t plain rubber.They’re reinforced with tough fiberglass strands that don’t stretch, and their synchronous teeth are very accurately made. Next, it’s always been an engineering challenge to keep the long chains or gear trains necessary for overhead cam engines quiet and trouble-free. Also, if there was a failure of a chain, a sprocket or a gear, the oil tightness of the engine would have to be violated to perform the repair, and that meant there was always the potential of comebacks for lube leaks. A timing belt is inherently quiet, and its replacement is an external job.

This Subaru magazine is available FREE at End Wrench website, we merely collect the information, we are neither affiliated with the author(s), the website and Subaru brand nor responsible for its content and change of content. (Read our disclaimer here or here before you download the document from the website written above by clicking the below link).

Download End Wrench about Subaru’s timing belt: End Wrench Subaru: T-Belt Time All About OHC Timing Belts.pdf (0.7 MB, 12 pages pdf file).

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