stripped cam cap thread repair

[Coady]

Would I use this to repair the stripped cam cap thread in my 79 GS750 head?

http://cgi.ebay.com.au/M6-X-1-00-Perma-Coil-Thread-Repair-Kit-Uses-Helicoil_W0QQitemZ300334539040QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item45ed556120

Also I have read of using an SAE 1/4 inch bolt to self tap into a stripped hole, any one tried this method?

Thanks

[rapidray]

That IS the correct Helicoil set to use. I would NOT use the 1/4 inch repair bolts just because the bike is metric. Ray.

[posplayr]

I have used that size and it worked well. I would not bother making the gargantuan hole required to do an insert.

[makr]

Wow, that thread installation kit is cheap. Prolly perfect for a hobby kit.


I cant see how a 1/4 bolt will hold. The 6 mm is only .013 smaller. There are some bolts on your bike where you can cheat, and some you really, really shouldn't. Cam cap bolt seems one of those you shouldn't.

[Coady]

Thanks Guys.

I have used that size and it worked well. I would not bother making the gargantuan hole required to do an insert.

And posplayr are you referring to the 1/4 inch self tapping bolt method as opposed to the helicoil?

[posplayr]

Thanks Guys.





And posplayr are you referring to the 1/4 inch self tapping bolt method as opposed to the helicoil?

No more like this; There are others i just dont remember the name brands. Requires you drill a much larger hole and you may or may not have enough meat to drill that size out. The helicoil, requires a much smaller drill/tap size for the same size (e.g. 6x1mm), so even though the insert if "better" the helicoil is usually "good enough" and much less likely to drill into something where you go through or crack the surrounding area.

http://www.amazon.com/gp/product/B001JK802K/ref=pd_lpo_k2_dp_sr_1?pf_rd_p=486539851&pf_rd_s=lpo-top-stripe-1&pf_rd_t=201&pf_rd_i=B001JK44LG&pf_rd_m=ATVPDKIKX0DER&pf_rd_r=0THE4EVHKRV2JNEW8JS9

[Coady]

No more like this; There are others i just dont remember the name brands. Requires you drill a much larger hole and you may or may not have enough meat to drill that size out. The helicoil, requires a much smaller drill/tap size for the same size (e.g. 6x1mm), so even though the insert if "better" the helicoil is usually "good enough" and much less likely to drill into something where you go through or crack the surrounding area.


http://www.amazon.com/gp/product/B00...VHKRV2JNEW8JS9

OK I get ya - I had seen those too and wondered. Thanks again.

[chef1366]

Can't you just hit a local parts store and get these? I bought mine from Autozone.

[Coady]

Can't you just hit a local parts store and get these? I bought mine from Autozone.

Fair point. But from my experience with auto parts stores in Australia, they generally haven't got a huge range of stock and more specialist items tend to be overpriced. I also find that with the exchange rate at the moment it's easier and cheaper to order from the US with non-urgent items (except for Bike bandit which has absurd international postage fees).

[blowerbike]

1/4-20 fix will hold 400+ horsepower.........
not the correct fix but what do you do when your at the track and your threads pull out when working on the valve train?
the smaller the heli coil the more of a pain in the a$$ it is to install.
either way...
1/4-20 will be around for a long time and when done right will last the life of your bike.

[chef1366]

1/4-20 fix will hold 400+ horsepower.........
not the correct fix but what do you do when your at the track and your threads pull out when working on the valve train?
the smaller the heli coil the more of a pain in the a$$ it is to install.
either way...
1/4-20 will be around for a long time and when done right will last the life of your bike.

1/4-20 is that a 2.0 pitch?

[blowerbike]

1/4-20 is that a 2.0 pitch?

1/4x20 =20 threads per inch.(course)
1/4x24 =24 threads per inch.(fine)

[rapidray]

what do you do when your at the track and your threads pull out when working on the valve train?

I do all my work at the shop BEFORE I go to the track & don't HAVE to work on it at the track!!! I also helicoil all the cam cap holes on my race heads before they ever go together to AVOID breakage! Ray.

[Don-lo]

A 1/4-20 bolt is a strong, reuseable fix, but you will need to tighten by feel, not torque wrench (just snug it up). More importantly, prevent the stripped threads by GETTING THE OIL OUT OF THOSE HOLES!

[posplayr]

While I might understand swapping to a SAE bolt for a valve cover bolt, I don't understand swapping to a larger 1/4 bolt thatdoesnt have the same stretch characteristic of the original metric bolt. As has been discussed here (on GSR) the accuracy of the bolt tension is related to the thread pitch and stretch characteristics. It is difficult enough to get the torque correct using a wrench, but mixing in different bolts can't help.