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K241 #9 Headbolt Stripped


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#1 Mike125s OFFLINE  

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Posted December 30, 2013 - 07:54 AM

Hi group

 

I have a 66 chief 1000.  Head gasket leaking so I tightened bolts to 30 ft lbs.  #9 bolt is stripped,any recommendations. Best way to fix? Heliocoil etc.  Something I could do without taking the engine off of the tractor?   Thanks

 

Mike C

Genoa,IL



#2 Mike125s OFFLINE  

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Posted December 30, 2013 - 07:57 AM

Hi group

 

I have a 66 chief 1000.  Head gasket leaking so I tightened bolts to 30 ft lbs.  #9 bolt is stripped,any recommendations. Best way to fix? Heliocoil etc.  Something I could do without taking the engine off of the tractor?   Thanks

 

Mike C

Genoa,IL

Sorry, I meant to say block stripped at the #9 bolt.  Thanks

 

Mike



#3 KennyP ONLINE  

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Posted December 30, 2013 - 08:00 AM

Heliocoil is what I would go with.


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#4 Mike125s OFFLINE  

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Posted December 30, 2013 - 08:20 AM

Kenny

 

Have you ever tapped the hole for the next larger bolt?



#5 Mike125s OFFLINE  

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Posted December 30, 2013 - 08:24 AM

I think a small piece of a previous helicoil came out with the bolt too?



#6 KennyP ONLINE  

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Posted December 30, 2013 - 08:27 AM

Kenny

 

Have you ever tapped the hole for the next larger bolt?

No I haven't. I've used heliocoil in other situations and had good luck with them. No more torque then you are using there, should work okay. Just be sure the burrs don't get into the cylinder.

 

I think a small piece of a previous helicoil came out with the bolt too?

That doesn't sound good, though.


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#7 Walkinman1 OFFLINE  

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Posted December 30, 2013 - 08:35 AM

I would try to use a Keensert if possible, they have a lot more size options than helicoils plus they lock into the threads so they won't back out. A little pricier per insert but no proprietary taps or drill sizes so the price is well offset if you only need to do a few.
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#8 Mike125s OFFLINE  

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Posted December 30, 2013 - 06:26 PM

Upon further review.  I think the po mixed up the head bolts when reinstalling.  He used a short one under the coil which caused the first third or so of the threads to fail,pulling up the head slightly.There are still threads towards the bottom.  I think with the proper size bolt it will work.  Ill file down the high spot taking care not to get close to the 1/4 inch or so around the piston.  Maybe fill the outside of the screw whole with high temp jb weld  to level it out with the new gasket.  What do you think?

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#9 olcowhand ONLINE  

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Posted December 30, 2013 - 06:32 PM

If a stud won't be an issue, I think I'd put in a stud with the highest strength thread locker available.  This way the remaining threads won't be disturbed when you have to remove the head at a later date.


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#10 marlboro180 OFFLINE  

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Posted December 30, 2013 - 06:45 PM

Looks like in that middle pic you posted the leftmost one is the guy in question. Musta been leaking a while to erode the block away like that :-(   Anyways, I think if you wind in the right length bolt , you'll be fine. From the picture, it appears there are plenty of threads left to hold a proper bolt decently.

 

As to the JB weld, it may or may not help- regular JB is rated at 400 degrees ish, so it might just fill in that gap okay. I have seen it work it situations where it sure was not recommended. :-)

 

Just as an aside, before you tightened the head bolts, you did back them off before torquing them I hope? 


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#11 Mike125s OFFLINE  

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Posted December 30, 2013 - 07:02 PM

No I did not ,I will next time though thanks :wave: :wave: :wave: :wave: :wave: It has been a few years since I used a torque wrench.   About three of the bolts were loose.  The already  stripped one, one by the exhaust manifold,  and I think one by the carb.  The erosion was by the exhaust manifold on the fins right?  There was oil everywhere, fins caked with grass and oil.  Ran okay though!!  Thanks

 

Mike



#12 Mike125s OFFLINE  

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Posted December 30, 2013 - 07:04 PM

That chip is where a piece broke off while I was cleaning it.(rag with brake cleaner)

 

Mike


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#13 Walkinman1 OFFLINE  

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Posted December 30, 2013 - 07:39 PM

I'm with Daniel on this one, a stud will allow you to use every last bit of remaining thread without having to worry about a bolt bottoming out before it's tight. Plus studs have better clamping force anyways.
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#14 marlboro180 OFFLINE  

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Posted December 30, 2013 - 08:11 PM

No I did not ,I will next time though thanks :wave: :wave: :wave: :wave: :wave: It has been a few years since I used a torque wrench.

 

Mike

 One of the guys in our local BMW motorcycle club was religious about torquing his heads.... Not a bad thing mind you on things like an older R 65 like he had.  However, he never loosend them before re- torqing them . Well , afer some time, we were all in a ride well away from home, and his right jug fell right off the bike....right onto the highway.

 

 

This lesson stuck with me through life, and that was 30 - some years ago. Always loosen, before re- torquing anything. Them darn bolts stretch over time LOL.


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#15 Mike125s OFFLINE  

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Posted December 30, 2013 - 08:53 PM

I also have a 81 honda cb125s, 80 yamaha dt 175G, and a 92 Nighthawk 750.






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