1/4/2024 0 Comments Subaru timing belt tensionerSubaru is relatively new to using timing chains, so you will need to wait until enough FB engines reach the >100k miles range to see if the Subaru timing chain design passes the test of time. But here have been some engines equipped with timing chains that were very short-lived. The majority of timing chain-equipped engine designs fit the above description. Subaru had a few notoriously recurrent problems in past engine designs that were never fully resolved (like the head gasket issue which plagued previous generation of engines), so one can only hope that they got it right this time (or maybe not). My father had a Fiat which timing chain (plus sprockets) would have to be replaced every 40k miles or less, for example. But most cars will end up in the junkyard by that time. Once the engine reaches the point of needing a major re-build, you would need to replace the chains, tensioners, sprockets, etc. Theoretically, the lifespan of the timing chains and associated systems (slider, tensioner, etc.) is designed to be about the same as the useful lifespan of the engine itself, somewhere around 200k miles. Only two sliders, one fixed, and the other is the chain tensioner (for each chain, Subaru's boxer has actually two chains, one for each cylinder bank).
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