noticed a slight tap when I started my car up. The secondary timing chain tensioner broke on the drivers side. Didn’t hurt the motor luckily. Has anyone had this happen? It was an arp bolt and a billet tensioner from mmr.
Secondary tensioner bolt broke?
- Thread starter cheetohead04
- Start date
The actual bolt broke clean off. Heads were done by a pretty reputable shop. Was using a mmr tensioner and arp bolts.
Where did it break? Did both bolts break? Did you torque the bolt with an in/lb wrench? ARP fasteners are much stronger than the stock bolts, but breaking one would tend to make me think it was torqued past its limits. I'm guessing you didn't have a catastrophic failure. Nothing wrong with that outcome.
Going with different brand tensioners, but I bought "ARP" bolts from MMR. It's a little unnerving to hear of them breaking.
@cheetohead04 are you running aggressive cams? Heavy duty secondary chains? Launching off a 2 step?
@cheetohead04 are you running aggressive cams? Heavy duty secondary chains? Launching off a 2 step?
It looks like both bolts broke off flush with the threads in the head. I didn’t install them. Another shop did
Are there enough threads left to grab onto to remove the ends of the bolts or will you have to drill them out and use an easy out? If the broke flush at the surface of the bolt hole, I'd suspect they were overtightened. Since all the tensioners do is exert pressure on the secondary chain, unless something else failed and grabbed it, I can't see it would be subject to forces high enough to break the bolts. The stock bolts are much lower grade. Good luck. I hope you can get the bolts out easily.
If broken off enough that you can't grab it with anything, use a dremel with a cutoff wheel to slot the end. Turn it out with a screwdriver. It's worked for me in other circumstances.
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