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General Category >> Rubber Side Down! >> Snapped Cylinder Head Cover Bolt
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Message started by NCGibbon on 09/02/17 at 17:18:52

Title: Snapped Cylinder Head Cover Bolt
Post by NCGibbon on 09/02/17 at 17:18:52

Today I was working on my 600 mile servicing and completed over torqued one of the M6-60 bolts to the point where it broke off inside the head.

Not knowing what to do, I put it back together and ran it but started to see oil go down the side of my engine and see it is coming from the missing bolt hole. At this point I feel like I should take the head cover off and try to extract the bolt that is broken off so I can put a new one bolt in place (already ordered one from BikeBandit, the cost of shipping is twice as much as the part itself.

A couple of questions I would like to ask.
Do you feel like I need to do all that work of taking the head cover off and retrieving the broken bolt? If I don't done it, what other options do I have to keep oil from coming out? If I do take off the head cover, do I need to replace the seal on the head cover as well? If so what stuff do I need to buy?

Sorry for all the questions, this is my first bike and I feel like i really messed up here. Thank you for any advice you can give me.

-B.

Title: Re: Snapped Cylinder Head Cover Bolt
Post by Ruttly on 09/02/17 at 17:42:18

Just buy the polished stainless Allen bolt kit on eBay and replace them all.
If one broke then you might break another going back together , replace them all. I prefer the allens cause if you use a 4" long Allen socket , when you can see the socket shank twist it's tight enough no torque wrench needed !

Title: Re: Snapped Cylinder Head Cover Bolt
Post by justin_o_guy2 on 09/02/17 at 17:58:51

Use feel.
How many times did you turn each bolt?
Did you tighten each bolt the first time the socket went on it?
Go around twice?
Did you use the semiliquid gasket sealer or RTV?

Your decision, fix it or run it leaking.
But if you didn't use a semiliquid gasket carefully applied and go slowly around the torque pattern three or four times the gap between head and cover will be wider than optimal, decreasing oil pressure in the top end. Go back, fix it right. I had mine off three times. Never messed up a bolt. A 1/4" ratchet is all you need.

Title: Re: Snapped Cylinder Head Cover Bolt
Post by piedmontbuckeye on 09/03/17 at 07:40:54

Check McMaster-Carr for your stainless screw replacements. You may have to purchase packets of certain sizes (like 5 per pack) but often cheaper than buying a made-up "kit" that someone else has put together and charge you more than you need to pay.

As a purchasing agent, I have never had an issue with McMaster-Carr - ever. And, they have an excellent online catalog service that is easy to use. Shipped right to your door!

Title: Re: Snapped Cylinder Head Cover Bolt
Post by Elmer on 09/15/17 at 23:56:02

Careful with the torque on these bolts. The aluminum case is very sensitive and will strip. I stripped out the long bolt as well. I ended up finding a bolt that was just a bit longer to bite into the threads below the old bolt. Now it hangs on just tight enough to keep the seal and no oil leak thus far.