Help! Don't know how to fix this one
08-25-2008, 10:05 AM
#1
Senior Member
Thread Starter
Join Date: Aug 2006
Location: Edmonton,
AB, CANADA
Posts: 468
Likes: 0
Received 0 Likes
on
0 Posts
Help! Don't know how to fix this one
One of the bolts for my cyclinder head has stripped out. The bolt unfortunatly was fine but my crankcase is hooped. Do I need a new crankcase or can it be re-threaded? It's the bolt on the side of the flywheel. It almost looks like I can take off the flywheel, use a longer screw with a bolt to hold the cyclinder on? Maybe.
08-25-2008, 11:56 AM
#2
Junior Member
Join Date: Jul 2006
Location: P, GREECE
Posts: 5
Likes: 0
Received 0 Likes
on
0 Posts
RE: Help! Don't know how to fix this one
I would check with my local machinist. Although there are no pics to see the actual damage I guess it can be done somehow. These guys can work miracles sometimes. Just be careful on how much he will charge you in case it can be restored. Sometimes it's less expensive to buy a new part than fix the broken one.
08-25-2008, 12:11 PM
#3
Senior Member
Join Date: Jun 2006
Location: kent!, UNITED KINGDOM
Posts: 1,471
Likes: 0
Received 0 Likes
on
0 Posts
RE: Help! Don't know how to fix this one
i totaly agree mate.. ^^
had the same problem myself, and cost me a bleeding forune, waste of time and money, maybe find out how cheap a new part would be.
Tom
had the same problem myself, and cost me a bleeding forune, waste of time and money, maybe find out how cheap a new part would be.
Tom
08-25-2008, 02:27 PM
#5
Senior Member
Thread Starter
Join Date: Aug 2006
Location: Edmonton,
AB, CANADA
Posts: 468
Likes: 0
Received 0 Likes
on
0 Posts
RE: Help! Don't know how to fix this one
ORIGINAL: hellya
drill it and rethread it yourself
cost $000
drill it and rethread it yourself
cost $000
08-25-2008, 02:33 PM
#6
RE: Help! Don't know how to fix this one
You can also use a Helicoil:
If the existing(broken) threads are M6,you make new threads M8,and then you insert the Helicoil which is M8 outside and M6 on the inside
If the existing(broken) threads are M6,you make new threads M8,and then you insert the Helicoil which is M8 outside and M6 on the inside
08-25-2008, 02:35 PM
#7
Senior Member
Join Date: Feb 2005
Location: Bonney Lake,
WA
Posts: 4,202
Likes: 0
Received 0 Likes
on
0 Posts
RE: Help! Don't know how to fix this one
ORIGINAL: mbe301
Do I use a larger bolt after? (I'm assuming after using a tap & Die set to re-thread, ...I've never used one)
ORIGINAL: hellya
drill it and rethread it yourself cost $000
drill it and rethread it yourself
cost $000
08-25-2008, 03:17 PM
#8
Senior Member
My Feedback: (5)
Join Date: Feb 2005
Location: Hamilton Ontario , CANADA
Posts: 1,161
Likes: 0
Received 0 Likes
on
0 Posts
RE: Help! Don't know how to fix this one
Helicolis are great being your putting in a Steel insert basically .. steels harder then cast .. and also retap out like Hellya said .. its not a hard thign too do, slow and easy !
08-26-2008, 03:10 PM
#9
Senior Member
Join Date: May 2003
Location: winterpark,
CO
Posts: 808
Likes: 0
Received 0 Likes
on
0 Posts
RE: Help! Don't know how to fix this one
An important trick when tapping..twist the tap in a quater of a turn then back it out a half a turn for each progressivly deeper cut, this will clean out the shavings and make a cleaner re-thread. But more importantly it will lessen the chances of the tap breaking off inside the head, (which I can tell you from personal experience not only really sucks but is also imposiable to fix.)
08-27-2008, 11:07 AM
#12
Senior Member
Thread Starter
Join Date: Aug 2006
Location: Edmonton,
AB, CANADA
Posts: 468
Likes: 0
Received 0 Likes
on
0 Posts
RE: Help! Don't know how to fix this one
Ya, kinda like hellya's RC school (I don't think there's anything 1/5 he can't help with). Thanks for the info. Off to buy some more tools!
09-01-2008, 04:46 PM
#13
Senior Member
Join Date: Jan 2008
Location: parksville,
BC, CANADA
Posts: 1,786
Likes: 0
Received 0 Likes
on
0 Posts
RE: Help! Don't know how to fix this one
don't know if you've fixed it yet but heli coil kit from lordco or napa works great (yep they carry metric from M3 up), super easy and stronger than the original, I had a stripped case too, helicoiled it and now better than new, also fixed an inlet bolt hole on the head. Tapping out is fine but helicoils are way stronger.
