Had to pull head... - ZX6R Forum
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post #1 of 6 Old 05-19-2017, 07:34 AM Thread Starter
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Had to pull head...

The engine is replacing a blown engine, so its been used and I don't know its maintenance history. Bolts on everything seemed over torqued (cam caps, and head bolts). I'm assuming the head bolts haven't been touched since the factory.

So anyway, in putting the head on, and tightening the bolts; the threads in the block sheered on one of them... (yes i'm following the torque specs per the manual 11ft/lbs then 39ft/lbs.) Has anyone ever heard of this on a current generation (2007-present) zx6r motor?

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post #2 of 6 Old 05-19-2017, 08:39 AM
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post #3 of 6 Old 05-19-2017, 10:35 AM
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I'd have to think that you are not the first person to put a head on that motor after it left the factory.\

"Basic stuff fellas. Use your head for something other than to break your next fall."

"There's this adage that we have 2 ears and one mouth so we should listen twice as much as we talk. Unfortunately with the Internet people have taken this old adage and turned it around. They have two eyes and 10 fingers so they think they need to post 5 times as much as they read. And since they have 10 fingers and one brain, they only have to think 10% of the time! "
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post #4 of 6 Old 05-19-2017, 04:21 PM
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Yes,, had issues with my cam retainer..

My NEW Torque wrench sucks. Went back my old one I was afraid was out of tolerance.

SO my guess is your torque wrench is also having issues or your bolt was either over torqued and weakened or it it was corroded in place. The later seems improbable.
Depending on what you find after tear down. Consider replacing all those bolts, assuming they are all weakened thus stretched.
I regret not doing that on my Honda, ended up with a weeping leak lower jugs after the rebuild.
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post #5 of 6 Old 05-19-2017, 07:08 PM Thread Starter
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yea. pretty corroded which didn't help, but figured out what i did though...

so it was a long day with little sleep. was torquing to ft/lbs... the 39 in my post is the n/m measurement... the ft/lbs conversion is 29. very similar numbers. way over torqued. lesson learned...

the good news. the engine is coming together again after lathing a custom head stud. pictures to come...
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post #6 of 6 Old 05-20-2017, 04:28 AM
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That's good..

Once I pulled the wrong wrench, wasn't inch pounds, was foot pounds.
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