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My 2012 Pilot turned off on highway the other day, would not restart. Would turn over but not start. Had it towed to shop, and they figured out that timing belt was not moving. They are pretty sure the tensioner has broken. I had my timing belt done 20,000 miles ago (same shop) with a genuine Honda timing belt kit. Has anyone experienced this with so few miles on a new tensioner? They haven't gotten into it yet but say this almost always causes damage to engine. Isn't there a safety shutoff when the belt jumps that shuts the engine off to prevent damage? Thanks.
 

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1. There is no safety shutoff. Engines have momentum, and as soon as the timing belt stops rotating the cams in "time", the pistons slap the valves and they are bent. This happens in less than a second, at 3000 RPM's. This is an interference engine, which means the pistons will impact the valves that happen to be extended when the cams stop rotating.

2. You need to get an analysis of what broke the belt. As soon as they remove the lower timing cover, they will know. A failed tensioner part won't do it. They will make a ton of racket and fail slowly, and if they completely fail you will risk a simple jump of the belt and the engine will immediately start running poorly, and throw a CEL. Most likely, your idler pulley bolt broke. This is a common failure, and why I replaced mine with a new bolt when I had mine done. There are many reports of this bolt breaking within 10,000 miles of a timing belt job. You can search this site for those stories. I actually replace two bolts, the idler pulley bolt, and the tensioner pulley bolt. Great care must be given to the torque specs on these as well, or you risk a break. This is another reason that if I didn't do the timing belt myself, I'd only consider a Honda dealer for this work. I don't think the shop is generally liable, as unfortunately replacing these bolts (and sometimes even the timing belt hydraulic tensioner) is not part of a "standard" timing belt job.

Sometimes, people break a belt, and somehow the valves are not bent. I don't see how that's possible, but it has been reported. With bent valves, you must pull the heads off, get the bent valves replaced, remediate any damage, then install them again with new head gaskets, and another timing belt job. It is a lot of labor.
 

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Discussion Starter #3
133838
Well this is what they found, along with a broken and shredded belt. They aren't even sure what it is, am taking it to a Honda specialist.
 

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They are retarded if they don't know what that is. That is simply the belt "stopper" that keeps it in place around the crankshaft pulley.



133839



 

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Discussion Starter #5
So what do think happened? The timing belt broke and then broke that off? Here are some pics of the belt.
133840
133841
133842
 

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I suppose once the belt broke, it could have fallen into the crank pulley and that got chewed up by pulling the belt through there.... That looks like a sheared bolt that's left in there leading you to believe the belt took that part out.

So the question is - if that's just a symptom, and not a cause, why did the belt break after 20,000 miles?

Only things I can think of is oil contamination on the belt from a leak, damage to the belt during the install, a failed tensioner that has been making racket for a long time, something failed in the head/camshaft and seized a cam, a broken bolt on the idler/tensioner they didn't tell you about, or they never actually changed it.
 
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I suppose once the belt broke, it could have fallen into the crank pulley and that got chewed up by pulling the belt through there.... That looks like a sheared bolt that's left in there leading you to believe the belt took that part out.

So the question is - if that's just a symptom, and not a cause, why did the belt break after 20,000 miles?

Only things I can think of is oil contamination on the belt from a leak, damage to the belt during the install, a failed tensioner that has been making racket for a long time, something failed in the head/camshaft and seized a cam, a broken bolt on the idler/tensioner they didn't tell you about, or they never actually changed it.
I had the same problem 2012 exln. I bought the timing kit and mechanic installed it and it was working for 3 months and then done. SAME AS PICTURE. I thought I got good parts turns out there is fake oem honda parts.... looks the same as honda and it has the same part numbers. But my lost. And now am parting out... getting something newer. My 2 cents and I repeat... go to the dealer and change parts that touch the engine.. I repeat... anything dealing with the engine let the dealer do it.. I was trying to save a dollar and spent thousands. Also I just need to change a tensioner only... but the mechanic said let's to everything to get it out of the way.... and bamn ... now the car is out of the wayo_O. I got 2 retrofit headlights 2 sets of tires 20 in and 18 oem with rims. Hit me up...
 
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