Some WabCo B6 Rebuilds

b2major9th
Posts: 446
Joined: Sat Apr 11, 2015 9:44 pm
Location: Torrance, California USA

Some WabCo B6 Rebuilds

Postby b2major9th » Wed Sep 13, 2017 10:52 am

Recently rebuilt long-bell and short-bell B6 horns. A couple of interesting observations filed under the "you never know what you are going to see:" (1) The short bell horn had no seal installed at all. Massive air leak, made a slight mooing sound when subjected to full flow/pressure. (2) The long bell had a dried out, rock hard seal that I had to essentially break and dig out. Someone made a gasket to go between the bell flange and base flange which only served to stand off the back from the bell which prevented the diaphragm from being tensioned at all. A slight mooing sound was all it produced when subjected to full air/pressure. The pictures tell the story.
Attachments
IMG_8231Short_bell-r.jpg
Short bell back flange as seen when opened: no seal here!
IMG_8232Short_bell-r.jpg
Short bell and diaphragm
IMG_8244Short_bell-r.jpg
Getting it to run true before machining

b2major9th
Posts: 446
Joined: Sat Apr 11, 2015 9:44 pm
Location: Torrance, California USA

Re: Some WabCo B6 Rebuilds

Postby b2major9th » Wed Sep 13, 2017 10:56 am

WabCo B6 rebuilds, continued. Completed short bell machining and found that the diaphragm needed repair. It had a loose counterweight (common problem with these horns) which if allowed to persist would get worse with time, and eventually would cause the diaphragm to crack from the impact forces. It must be disassembled and repaired.
Attachments
IMG_8245Short_bell-r.jpg
Short bell machined to spec
IMG_8246Short_bell_dia_loose_disassembled-r.jpg
Short bell diaphragm had a loose counterweight which if not repaired would eventually crack and ruin the diaphragm
IMG_8247Short_bell_dia_damage-r.jpg
Damage to diaphragm disk caused by counterweight moving around during operation

b2major9th
Posts: 446
Joined: Sat Apr 11, 2015 9:44 pm
Location: Torrance, California USA

Re: Some WabCo B6 Rebuilds

Postby b2major9th » Wed Sep 13, 2017 10:58 am

WabCo B6 rebuilds, continued.
Attachments
IMG_8248Short_bell_counterweight_modification-repair-r.jpg
Drilled 10-32 tap size
IMG_8249Short_bell_dia_repair-r.jpg
Tapping 10-32 threads
IMG_8250Short_bell_dia_repaired-r.jpg
Loose counterweight repaired

b2major9th
Posts: 446
Joined: Sat Apr 11, 2015 9:44 pm
Location: Torrance, California USA

Re: Some WabCo B6 Rebuilds

Postby b2major9th » Wed Sep 13, 2017 11:02 am

WabCo B6 rebuilds, continued. Here we see the completed B6 short bell and the beginning of the long bell rebuild: Note the "home made" gasket that someone thought would be a good idea, even though all it does is prevent the diaphragm from being properly tensioned in the assembly.
Attachments
IMG_8252Short_bell_Done-r.jpg
Short bell rebuild complete, alignment pin reinstalled, ready for assembly
IMG_8233Long_bell-r.jpg
Long bell flange showing gasket somebody thought was a good idea!?!!!
IMG_8234Long_bell-r.jpg
Long bell back flange

b2major9th
Posts: 446
Joined: Sat Apr 11, 2015 9:44 pm
Location: Torrance, California USA

Re: Some WabCo B6 Rebuilds

Postby b2major9th » Wed Sep 13, 2017 11:04 am

WabCo B6 rebuilds, continued.
Attachments
IMG_8235Long_bell-r.jpg
Long bell back flange showing "hard as rock" bad seal. I have started trying to dig it out of its pocket
IMG_8236Long_bell-r.jpg
Long bell showing diaphragm pocket and worn nozzle
IMG_8237Long_bell-r.jpg
Checking runout before machining

b2major9th
Posts: 446
Joined: Sat Apr 11, 2015 9:44 pm
Location: Torrance, California USA

Re: Some WabCo B6 Rebuilds

Postby b2major9th » Wed Sep 13, 2017 11:06 am

WabCo B6 rebuilds, continued.
Attachments
IMG_8238Long_bell-r.jpg
Machining the long bell to spec
IMG_8239Long_bell-r.jpg
Machining to spec completed
IMG_8240Long_bell-new_seal_installed-r.jpg
New seal fabricated and installed in back flange pocket.

b2major9th
Posts: 446
Joined: Sat Apr 11, 2015 9:44 pm
Location: Torrance, California USA

Re: Some WabCo B6 Rebuilds

Postby b2major9th » Wed Sep 13, 2017 11:07 am

WabCo B6 rebuilds, continued. Long bell machining completed. No diaphragm repairs necessary in this instance.
Attachments
IMG_8242Long_bell_done-r.jpg
Long bell components
IMG_8243Long_bell-r.jpg
Ready for final assembly and test

GEOMAZ35
Posts: 75
Joined: Mon Nov 03, 2014 11:40 pm

Re: Some WabCo B6 Rebuilds

Postby GEOMAZ35 » Wed Sep 13, 2017 7:25 pm

Nice work Mike.
It makes me want to send you my original RR condition WABCO E2B1, first generation.


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