Stripped bleed valve

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schonc
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Stripped bleed valve

#1

Post by schonc »

Went to install my new master cylinder on the bike... pretty exciting considering the breaks are the only thing that needs to be done before the bike is road worthy!
But found that the bleed valve was leaķing... and tightening it up stripped the treads from the caliper :(
Looks like this is the second time this has happened as I've found these aren't the stock size bleed screws.
Anyways... I'm looking to use something like this picture. Has anyone used one before? Ive found a few on amazon but the quality is questionable and some of the products dont even specify the treads size :/ ...The bike is a '79
images (2).jpg
images (2).jpg (5.52 KiB) Viewed 251 times
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flyin900
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Re: Stripped bleed valve

#2

Post by flyin900 »

Where abouts in Canada are you? If you have a thread size on the bleeder screw I have a complete master metric Time Sert set that may have the correct size of Sert to repair your caliper.

That brass insert should work as long as you have enough material to drill out of the caliper area and retap for the size of the insert. Doesn't really matter on the bleeder size thread if you are buying the whole kit as shown in your picture. You only need to drill and tap for the insert and the bleeder will thread into the brass insert correctly as shown in your picture.
Current Bikes:

1966 CL77 - Honda 305cc - Dual purpose - "Gentleman's Scrambler" was a period moniker.
1967 CL175K0 - Low production number with #802 engine serial- winter 2019/2020 full restoration.
1972 CB350F - Baby Four with low mileage - Cosmetic refresh to the next level 2021/2022.
1978 CB550K - Very original bike with only 7499 Km. from new - light cleanup and refresh done.
1983 CB1100F - Canadian model - DOHC Supersport in pristine low kilometre condition from new.
1984 GL1200 - Standard model in showroom condition - two owner bike from new.
1984 CX650E - Restored summer 2017 - a rare Eurosport model - excellent one owner bike.
schonc
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Re: Stripped bleed valve

#3

Post by schonc »

I'm in Calgary. What is the largest size in the kit?
I was thinking that I'd have to go big with this repair since it seems it's already been upsized once. I'm not certain what it was tapped to just that it's not metric (Don't have SAE tread gauges).
One of the kits i found had a 1/8 NPT tread. I've sized it up with a 1/8 NPT tap and looks like it will have enough material... just need to find one that is a quality piece. This is probably the last shot at saving this caliper; i don't want to just chance it on something that is a "universal fit".
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CYBORG
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Re: Stripped bleed valve

#4

Post by CYBORG »

be carful .
the bottom of the bleeder is tapered, and seals with same tapered in the caliper. Installing the bleeder in an adapter piece, will not create a seal
1978 custom GL1000
1977 custom with 1200 engine
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schonc
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Re: Stripped bleed valve

#5

Post by schonc »

Yes, I'm hoping that the adapter piece would have a new seat for the new bleed valve... I guess that's why I'm asking if anyone any experience with them... if there is a brand/supplier that they could recommend.
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flyin900
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Re: Stripped bleed valve

#6

Post by flyin900 »

If it has been changed to a SAE style and already re tapped I wouldn't do any further work myself in trying to change it back to metric for you. I have a Kent Moore GM Northstar engine Time Sert kit that will do sizes from 6mm to 14mm sizes.
If you can use that kit you pictured it may be worth a try, or better yet a replacement caliper should also be considered. You may find a replacement one available from a member on the site here.
Current Bikes:

1966 CL77 - Honda 305cc - Dual purpose - "Gentleman's Scrambler" was a period moniker.
1967 CL175K0 - Low production number with #802 engine serial- winter 2019/2020 full restoration.
1972 CB350F - Baby Four with low mileage - Cosmetic refresh to the next level 2021/2022.
1978 CB550K - Very original bike with only 7499 Km. from new - light cleanup and refresh done.
1983 CB1100F - Canadian model - DOHC Supersport in pristine low kilometre condition from new.
1984 GL1200 - Standard model in showroom condition - two owner bike from new.
1984 CX650E - Restored summer 2017 - a rare Eurosport model - excellent one owner bike.
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05c50
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Re: Stripped bleed valve

#7

Post by 05c50 »

I've used the bleeder repair like the one shown in your picture. I bought it at a local NAPA auto parts store. The quality of the repair depends on your ability to drill and tap a hole in the caliper. The adapter uses a pipe thread on the outside thread and does have a machined seat to match the new bleeder. They come in different sizes, so try to get the smallest one so that you don't have to remove too much material from the caliper.

......Paul
I prefer to ride my wing naked,thank you
My wife asked me "How many bikes does one man need?" My answer "Uhhh.just one more"
75 Goldwing
78 Goldwing
77 CB750a
77 CB550f
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schonc
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Re: Stripped bleed valve

#8

Post by schonc »

Just ordered a some from online. Got a set of 4 with 1/8" NPT for 25 cad and free shipping.

My local part shops didn't have any. I just got a funny look before they told me I should buy a new caliper... I told them the make and model and they just as quickly said they didn't have any of those Haha
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jdvorchak
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Re: Stripped bleed valve

#9

Post by jdvorchak »

good thing you got a new bleeder and seat. The reason you old one stripped is the bleeder or the seat was no good. What a lot of folks don't know is that you shouldn't have to Godzilla tighten those bleeders if the seats are good. Just snug should be good enough. Otherwise replace the bleeder and hope the seat is still intact.
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delling3
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Re: Stripped bleed valve

#10

Post by delling3 »

I have spare a spare caliper from a '78 that I can send you if needed.
delling3

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Previous:
1978 GL1000 - JUNE 2017 BOTM: Sold
2006 Kawasaki Concours: Sold
1995 Kawasaki Concours: Crashed/totalled.
1976 GL1000: LAST RESTORATION, sold
1981 Honda CB900F Supersport: 3rd restoration, sold.
1979 Yamaha XS-750F: 2nd restoration, sold.
1982 Honda FT-500 Ascot: First (only) new bike. Family forces sale.
1973 CB500 Four: First restoration, long gone.
1972 Suzuki TS-100: First bike, sold.

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schonc
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Re: Stripped bleed valve

#11

Post by schonc »

Thanks for the help guys.
I've got the calipers tapped. I decided to do both since it looked like righty was treated to the same poor tap job as lefty. It's now looking pretty good; plenty of nice, new threads. Just got to wait for the parts to show up.

I'm considering ways to "permanent" the new seat in place for ease of bleeding and peace of mind.
Options that I see are
1 red thread lock at top most threads with teflon tape at bottom
2 Teflon full length of thread and stake the top thread
3 solder (No teflon needed)

Right now I'm leaning toward soldering it since it would serve to seal & hold in place, and could be undone with heat. Any thoughts?
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05c50
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Re: Stripped bleed valve

#12

Post by 05c50 »

I'm not aware of any solder that will work with aluminum (caliper) and brass (seat fitting). I guess you could use thread lock, but once the seat is threaded into the caliper, the bleeder shouldn't be tightened enough to cause the fitting to turn.

......Paul
I prefer to ride my wing naked,thank you
My wife asked me "How many bikes does one man need?" My answer "Uhhh.just one more"
75 Goldwing
78 Goldwing
77 CB750a
77 CB550f
80 CB650c
05 Boule C50
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flyin900
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Re: Stripped bleed valve

#13

Post by flyin900 »

The red thread locker is all you will need if you want to use something to hold the brass adaptor in place. It will seal and hold the part and can be removed with heat if necessary in the future.
Current Bikes:

1966 CL77 - Honda 305cc - Dual purpose - "Gentleman's Scrambler" was a period moniker.
1967 CL175K0 - Low production number with #802 engine serial- winter 2019/2020 full restoration.
1972 CB350F - Baby Four with low mileage - Cosmetic refresh to the next level 2021/2022.
1978 CB550K - Very original bike with only 7499 Km. from new - light cleanup and refresh done.
1983 CB1100F - Canadian model - DOHC Supersport in pristine low kilometre condition from new.
1984 GL1200 - Standard model in showroom condition - two owner bike from new.
1984 CX650E - Restored summer 2017 - a rare Eurosport model - excellent one owner bike.
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robin1731
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Re: Stripped bleed valve

#14

Post by robin1731 »

Why do feel the need to do any of that? The seal isn't around the threads. It is where the screw "seats" at the bottom of the hole. Sealing the threads doesn't do any more.

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schonc
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Re: Stripped bleed valve

#15

Post by schonc »

Got the new seats.
20170425_141646.jpg
20170425_141646.jpg (114.13 KiB) Viewed 119 times
Here they are with the one I pulled out of the caliper and another I pulled out of a caliper from a 70s CB.
The new bleed valve is tiny which made me a bit nervous. 1/4" head on it.
20170425_142738.jpg
20170425_142738.jpg (90.6 KiB) Viewed 119 times
In the end I was more concerned with getting a proper seal over making sure it doesn't back out of the caliper. So I ended up putting them in with just Teflon.

Got a good bleed on them now so I'd call it a success. :)
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