Hi all,
I notice quite a few warnings about being careful with your exhaust port threads as steel going into aluminium can easily deform the threads. Well, that's exactly the problem I have (done by some idiot before me) and the threads, while not totally wrecked, are seriously cross-threaded. I haven't noticed any tips to rectify this. I'm also finding it difficult and expensive to find a tool to recut internal threads. What can I do?
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Exhaust Port Threads
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Exhaust Port Threads
by DessieH » Tue Aug 09, 2011 11:29 am
- DessieH
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- Joined: Tue Aug 09, 2011 11:06 am
Re: Exhaust Port Threads
by djsbriscoe » Tue Aug 09, 2011 3:08 pm
Have you tried a thread restoring file? You can buy as a metric set.
David.
David.
Bikes:2006 RT125 (sold Jan 2013),2001 Skorpion Traveller (sadly sold) Current bike Honda NC750X DCT (2014)
Past owner of original ETZ125,ETZ251,Kanuni ETZ251 models
Location:London UK
Electronics tech by trade.
Past owner of original ETZ125,ETZ251,Kanuni ETZ251 models
Location:London UK
Electronics tech by trade.
- djsbriscoe
- Posts: 341
- Joined: Sun Aug 21, 2005 12:55 pm
- Location: London,UK
Re: Exhaust Port Threads
by DAVID THOMPSON » Tue Aug 09, 2011 10:31 pm
the threader you need should be on the side of file at end
you will see how it goes when its in hand
and they weren't cheap years ago so brace your self
might see if a shop or jobber rents them by the day
take pipe nut with you so you get one with the correct size
dave rt125 in usa
you will see how it goes when its in hand
and they weren't cheap years ago so brace your self
might see if a shop or jobber rents them by the day
take pipe nut with you so you get one with the correct size
dave rt125 in usa
Dave 2002 MZ RT125+1995 Saxon Tour(500cc)
1997 MZ 660 Traveller+6/13/09 WV USA
"IN the end times the IDIOTS will be in charge
of everything"
"I like the road less traveled if it's PAVED!"
wd8cyv at yahoo dot com
1997 MZ 660 Traveller+6/13/09 WV USA
"IN the end times the IDIOTS will be in charge
of everything"
"I like the road less traveled if it's PAVED!"
wd8cyv at yahoo dot com
-
DAVID THOMPSON - Moderator
- Posts: 5162
- Joined: Sun Nov 23, 2003 11:01 am
- Location: Parkersburg, West Virginia USA .questions answered MZ 95 up, BMW 1953 to 1979 and ham radio WD8CYV
Re: Exhaust Port Threads
by Stephenonz » Wed Aug 10, 2011 5:05 am
I would have thought a heli-coil would be the easiest solution:
http://www.emhart.com/brands/heli-coil/
http://www.emhart.com/brands/heli-coil/
- Stephenonz
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- Joined: Mon Nov 02, 2009 4:09 am
Re: Exhaust Port Threads
by DessieH » Wed Aug 10, 2011 6:06 am
Stephenonz and David,
Firstly, the grooves in the file run lenghtwise, no grooves run sideways. If they did run sideways you could get the file at the threads internally. The only possibility with the file would be to cut the end off and turn it 90 degrees. That's a lot easier said than done as the file is hardened steel. As for inserts I haven't found any bigger than about 12mm. They seem to be produced for the more common sizes,and 50x 1.5 is very uncommon.
Thanks for your suggestions.
Dessie
Firstly, the grooves in the file run lenghtwise, no grooves run sideways. If they did run sideways you could get the file at the threads internally. The only possibility with the file would be to cut the end off and turn it 90 degrees. That's a lot easier said than done as the file is hardened steel. As for inserts I haven't found any bigger than about 12mm. They seem to be produced for the more common sizes,and 50x 1.5 is very uncommon.
Thanks for your suggestions.
Dessie
- DessieH
- Posts: 6
- Joined: Tue Aug 09, 2011 11:06 am
Re: Exhaust Port Threads
by DessieH » Wed Aug 10, 2011 10:49 am
Guys,
I have found a solution ! I could see that some of thethreads were flattened just after the first two, so I started with a dremel saw to cut out the worst of the flattening. I then cut off the end of the restoration file, ending up with a piece just over 46mm long (ie just long enough to fit neatly into the hole sideways), clamped it with a vicegrip, making a tee shape, inserted it into the hole and worked it back and forward acting like a straight tap. It was enough to cut out the bad threads and , to make sure, I put the clamp on by hand. If you can't screw it in by hand, it's time to back off and in spect it closely.
Dessie
I have found a solution ! I could see that some of thethreads were flattened just after the first two, so I started with a dremel saw to cut out the worst of the flattening. I then cut off the end of the restoration file, ending up with a piece just over 46mm long (ie just long enough to fit neatly into the hole sideways), clamped it with a vicegrip, making a tee shape, inserted it into the hole and worked it back and forward acting like a straight tap. It was enough to cut out the bad threads and , to make sure, I put the clamp on by hand. If you can't screw it in by hand, it's time to back off and in spect it closely.
Dessie
- DessieH
- Posts: 6
- Joined: Tue Aug 09, 2011 11:06 am
Re: Exhaust Port Threads
by DAVID THOMPSON » Wed Aug 10, 2011 11:09 am
the file i had had threads on the end so you could work a inside hole
dave
rt125 in usa
dave
rt125 in usa
Dave 2002 MZ RT125+1995 Saxon Tour(500cc)
1997 MZ 660 Traveller+6/13/09 WV USA
"IN the end times the IDIOTS will be in charge
of everything"
"I like the road less traveled if it's PAVED!"
wd8cyv at yahoo dot com
1997 MZ 660 Traveller+6/13/09 WV USA
"IN the end times the IDIOTS will be in charge
of everything"
"I like the road less traveled if it's PAVED!"
wd8cyv at yahoo dot com
-
DAVID THOMPSON - Moderator
- Posts: 5162
- Joined: Sun Nov 23, 2003 11:01 am
- Location: Parkersburg, West Virginia USA .questions answered MZ 95 up, BMW 1953 to 1979 and ham radio WD8CYV
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