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Zener Diode install #426305
03/26/12 1:23 am
03/26/12 1:23 am
Joined: Aug 2010
Posts: 205
Texas USA
D
DaveOfTexas Offline OP
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DaveOfTexas  Offline OP
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Texas USA
So I am looking at the diode, trying to decide how it installs. (Bike below) Previous mechanic removed, so I am guessing how it goes on. Cannot locate any pictures.

It appears to be most happy when I aim the blunt edge forward and the central wire down. Of course, with the spacer on the bolt, up against the fork first.

To restate; if I put it pointy end forward, it seems to contact the shock rubber. The spacer must go on first or it will contact the forks. Putting the central wire conductor up results in interference.

Anyone care to help or have a photo?

When that is done, I will be asking where the ring-terminal wire attaches, it should go to + (earth) on the device I believe but the ring is too small for the attachment bolt.

Thanks!


1969 BSA B44VS PC8113
Engine PC8113B44VS
Recently acquired (Feb 2011) Aiming to get running and return all parts/configurations to original.
First BSA. Have 1970 Honda CB750 too.
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Re: Zener Diode install [Re: DaveOfTexas] #426318
03/26/12 2:22 am
03/26/12 2:22 am
Joined: Jun 2002
Posts: 9,463
Scotland
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Stuart Online content
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Stuart  Online Content
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Scotland
Hi Dave,

Originally Posted By: DaveOfTexas
So I am looking at the diode, trying to decide how it installs.

According to the parts book (00-5146, pages 34-37), you should have a finned alloy heatsink (#63) that attaches under the lower yoke? Then, according to the Owner's Handbook (00-4144, p42), the Zener bolts to that. At the risk of stating the obvious, there shouldn't be anything between the Zener itself and the heatsink (it's the Zener that gets hot dumping excess current).

Fwiw, I smear the face of the Zener that'll go against the heatsink with graphite grease - to exclude the chance of moisture creating oxide between the Zener and the heatsink, graphite grease to maintain a good electrical contact. Also, I do up the Zener securing nut with a socket on an extension worked between thumb and forefinger - no wrench so I don't run the risk of breaking the stud. If it doesn't have them, I put stainless plain and spring washers under the nut - stainless so you don't get corrosion and the spring washer 'cos you don't do the nut up very tight.

Originally Posted By: DaveOfTexas
where the ring-terminal wire attaches,

If it's the same as a Triumph, to the heatsink mounting bolt - as I say, you should have good electrical contact between Zener and heatsink.

Hth.

Regards,

Re: Zener Diode install [Re: DaveOfTexas] #426324
03/26/12 2:52 am
03/26/12 2:52 am
Joined: Aug 2010
Posts: 205
Texas USA
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DaveOfTexas Offline OP
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DaveOfTexas  Offline OP
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Texas USA
The zener I have appears to be integral to the heatsink, Stuart.
I will try to post a picture tomorrow.


1969 BSA B44VS PC8113
Engine PC8113B44VS
Recently acquired (Feb 2011) Aiming to get running and return all parts/configurations to original.
First BSA. Have 1970 Honda CB750 too.
Re: Zener Diode install [Re: DaveOfTexas] #426763
03/28/12 9:02 pm
03/28/12 9:02 pm
Joined: Aug 2010
Posts: 205
Texas USA
D
DaveOfTexas Offline OP
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DaveOfTexas  Offline OP
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Posts: 205
Texas USA
Here is the zener and heat sink.
The questions remain;

1 Which orientation to install? (It can be flipped 180 or rotated 180 in the other plane)
2 Where to connect the ring terminal?

Thanks!



1969 BSA B44VS PC8113
Engine PC8113B44VS
Recently acquired (Feb 2011) Aiming to get running and return all parts/configurations to original.
First BSA. Have 1970 Honda CB750 too.
Re: Zener Diode install [Re: DaveOfTexas] #426806
03/29/12 2:42 am
03/29/12 2:42 am
Joined: Jun 2002
Posts: 9,463
Scotland
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Stuart Online content
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Stuart  Online Content
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Posts: 9,463
Scotland
Hi Dave,

Originally Posted By: DaveOfTexas
The zener I have appears to be integral to the heatsink,

Nah, that's a standard Zener used on Triumphs as well as Beezas; grin on the other side of that hex., there's a thread that's either screwed into the heatsink or has a nut on it on the other side of the heatsink. Ime, from the surface rust on the Zener, I'd definitely separate 'em to clean up the mating surfaces - as I say, corrosion between the two will reduce/stop both heat transfer and electrical conductivity; frown nevertheless, when unscrewing the Zener, bear in mind it and any nut are brass so soft.

Originally Posted By: DaveOfTexas
The questions remain;

I'll leave the orientation answer to someone more-familiar specifically with A65's B44's blush but connecting the ring terminal depends on its i.d. The Zener thread is 2BA, so a gnat's off 3/16" o.d.; if the ring's bigger, on the heatsink mounting bolt, either between the bolt head and the yoke or between the yoke and the heatsink. Only place not to connect it is between the heatsink and the Zener itself - reduces the heat transfer capability and will cause early Zener failure. frown

Hth.

Regards,

Last edited by Stuart; 03/29/12 9:02 am. Reason: Ooops!
Re: Zener Diode install [Re: DaveOfTexas] #426813
03/29/12 4:12 am
03/29/12 4:12 am
Joined: Jan 2006
Posts: 3,321
Medford, Oregon
Gary E Offline
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Gary E  Offline
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Joined: Jan 2006
Posts: 3,321
Medford, Oregon
In this order on a Victor:
(Top to bottom)
Bolt
Washer
Fork
Spacer
Red connector
Serrated lock washer
Nut
Diode clip (faces the diode so it touches the diode - flat to flat)
Heat sink
Nyloc nut

The heat sink: pointed end to the front

Wire tab on diode faces to the right for the brown/blue wire connector.

Diode on top of heat sink


1967 BSA Wasp
1967 BSA Hornet (West Coast Model)
1967 BSA Hornet (East Coast Model)
1968 BSA Firebird Scrambler
1968 BSA Spitfire Mark IV
Re: Zener Diode install [Re: DaveOfTexas] #426909
03/29/12 7:49 pm
03/29/12 7:49 pm
Joined: Aug 2010
Posts: 205
Texas USA
D
DaveOfTexas Offline OP
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DaveOfTexas  Offline OP
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Joined: Aug 2010
Posts: 205
Texas USA
way cool, thanks guys.


1969 BSA B44VS PC8113
Engine PC8113B44VS
Recently acquired (Feb 2011) Aiming to get running and return all parts/configurations to original.
First BSA. Have 1970 Honda CB750 too.
Re: Zener Diode install [Re: Gary E] #428666
04/08/12 8:11 pm
04/08/12 8:11 pm
Joined: Aug 2010
Posts: 205
Texas USA
D
DaveOfTexas Offline OP
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DaveOfTexas  Offline OP
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Joined: Aug 2010
Posts: 205
Texas USA
Originally Posted By: Gary E


The heat sink: pointed end to the front

Wire tab on diode faces to the right for the brown/blue wire connector.

Diode on top of heat sink


I was able to put it pointy end forward and diode on top, red wire terminal between nut and spacer....
but the blue/brn wire extends to the left side of the bike. I suppose that is because the zener was installed that way originally and it won't be an issue.

What does that clip do? (is between the spacer and nut; rests on the base of the diode)


1969 BSA B44VS PC8113
Engine PC8113B44VS
Recently acquired (Feb 2011) Aiming to get running and return all parts/configurations to original.
First BSA. Have 1970 Honda CB750 too.

Moderated by  Allan Gill, Jon W. Whitley 


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