F55/F56 Timing Chain on a 2015 F56S
#2
#3
there are 2 different ones, the actual timing valve chain for DOHC & the timing belt that's not actually for timing, it's for accessories. somebody on here will explain I'm sure. I think the chains = no need but the belts are different.and do need to be changed. the interval is a mystery to me so I too would like to hear the general consensus. I also have a 2015 MCS. F-56 w/ 47K mi.
#5
there are 2 different ones, the actual timing valve chain for DOHC & the timing belt that's not actually for timing, it's for accessories. somebody on here will explain I'm sure. I think the chains = no need but the belts are different.and do need to be changed. the interval is a mystery to me so I too would like to hear the general consensus. I also have a 2015 MCS. F-56 w/ 47K mi.
As far as interval on that belt goes, I changed mine on general principle when it had just under 7 years and 108.5k miles on it -- and frankly, it was still in decent condition. Probably could have made it to 120k but I wasn't about to fight with getting the belt off my B46 engine again. With a 4-banger stuffed in that engine bay it is a *royal* pain in the *** to remove or install.
I will note that harmonic balancer separation well before the belt goes bad on its own looks like a real and common-ish scenario, and if the balancer is not dealt with soon enough, it will damage the belt (and via belt wobble, damage other pulleys and whatever components they're attached to). Outside of us gearheads I doubt anyone proactively checks their harmonic balancer -- which in turn makes me expect to see more people replacing balancer-damaged belts than replacing a belt due to it actually hitting the end of its useful life.
The chain, yep, it's inside the back of the engine (not vehicle back, *engine* back -- as in closest to the transmission). Same general location as in the Gen1 and Gen2 engines.
Both Gen1 and Gen2 engines (*not* the B series) are known for having to deal with (1) chain stretch and (2) replacing the plastic chain guides before or when or after they go brittle and break/disintegrate/you get the idea. For Gen3 I don't see much chatter out here, but I suspect part of that is the Gen3 engines are still pretty young. And with them being so young, a change/maintenance interval for the chain may not, as a practical matter, be known yet.
Last edited by cjv2; 12-02-2023 at 11:32 AM.
#7
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#8
Yep, we have them here: https://www.ecstuning.com/b-ecs-part...lt/6pk1715ecs/
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Customer Service Hours: 8am-8pm EST|Sales Team Hours: 8am-11pm | SAT 10am-7pm 800.924.5172
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