Horn
- Wes Bender
- 356 Fan
- Posts: 4861
- Joined: Wed Aug 27, 2008 10:54 am
- Location: Somewhere in the Gadsden Purchase, USA
Re: Horn question for all you engineers?
Julian Hardy is still rebuilding these. Excellent quality.
Some days it's just not worth chewing through the restraints.....
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- 356 Fan
- Posts: 1347
- Joined: Fri Dec 12, 2008 1:15 pm
- Location: coos bay oregon
Re: Horn question for all you engineers?
no not him, I'm talking maybe 15-20 years ago maybe even longer
Jay D.
Jay D.
jay darlington
- Mervyn Hyde
- 356 Fan
- Posts: 797
- Joined: Wed Nov 25, 2015 9:12 pm
- Location: Sunshine Coast Australia
Re: Horn question for all you engineers?
Mick Temple is the gentleman helping me with this
Merv
TYP356
1963 356B T6
1968 911 SWB
TYP356
1963 356B T6
1968 911 SWB
- Mervyn Hyde
- 356 Fan
- Posts: 797
- Joined: Wed Nov 25, 2015 9:12 pm
- Location: Sunshine Coast Australia
Re: Horn question for all you engineers?
He is the author of probably the best guide on restoration of these horns. I found I had made one misinterpretation in one of his diagrams, which showed the sequence of parts in the capacitor carrier. I rectified that and now have the horn working with the modern capacitor.
Merv
TYP356
1963 356B T6
1968 911 SWB
TYP356
1963 356B T6
1968 911 SWB
- Greg Bryan
- 356 Fan
- Posts: 3692
- Joined: Sat Oct 04, 2008 1:05 pm
- Location: San Pedro, CA 90732; Fallen Leaf, CA 96150
- Contact:
Re: Horn question for all you engineers?
Merv - would love to see Mr. Temples guide to horn restoration ....
Greg Bryan
- Mervyn Hyde
- 356 Fan
- Posts: 797
- Joined: Wed Nov 25, 2015 9:12 pm
- Location: Sunshine Coast Australia
Re: Horn question for all you engineers?
Sent it by email Greg. Cheers Merv
Merv
TYP356
1963 356B T6
1968 911 SWB
TYP356
1963 356B T6
1968 911 SWB
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- 356 Fan
- Posts: 23
- Joined: Tue Nov 26, 2019 11:29 pm
Re: Horn
I have also gone down the rabbit hole that is the innards of the Bosch 6V horn. I was thrilled to see the diagram of the capacitor carrier, but then crestfallen to see the update that Merv made a change and the posted diagram is incorrect. Does anyone have the correct parts sequence? Merv if you are “listening” would love Mr. Temple’s guide as well!! Thanks.
- Jim Clement
- 356 Fan
- Posts: 1461
- Joined: Tue Oct 26, 2010 10:46 am
- Tag: 1957 356 A Coupe
- Location: Calgary Alberta
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- 356 Fan
- Posts: 23
- Joined: Tue Nov 26, 2019 11:29 pm
Re: Horn
Here is how I assembled the contact assembly. What a bugger that one is. Still no joy. Thanks to Julian for a few helpful pointers on the phone today!!
- Greg Bryan
- 356 Fan
- Posts: 3692
- Joined: Sat Oct 04, 2008 1:05 pm
- Location: San Pedro, CA 90732; Fallen Leaf, CA 96150
- Contact:
Re: Horn
After seeing that I received the presentation from Mervyn some years ago, I searched and found it in my files. I'm going to post it as I can't believe the creator (is it Mark Temple or am I reading the above posts incorrectly?) of the resource will mind. If he does, I'll remove it.
It is a very good description of the horn overhaul procedure.
It is a very good description of the horn overhaul procedure.
- Attachments
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- Dec11 Restoring an early Bosch horn reduced file2.pdf
- (488.81 KiB) Downloaded 69 times
Greg Bryan
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- 356 Fan
- Posts: 23
- Joined: Tue Nov 26, 2019 11:29 pm
Re: Horn
I’m still trying to get this horn to work. I added a 100 micro farad 10V capacitor into the circuit as suggested by Merv. I’m trying to keep the round film capacitor in the mix because it is the right size to make the contacts work, but man what a FUSS to get to stay together.
I also don’t like the way the contact points are coming together. The top contact is coming in at an angle and the points are barely touching. I think another washer may be required to flatten the angle and make better contact. I did learn from another member that the contacts are normally closed.
I also don’t like the way the contact points are coming together. The top contact is coming in at an angle and the points are barely touching. I think another washer may be required to flatten the angle and make better contact. I did learn from another member that the contacts are normally closed.
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- 356 Fan
- Posts: 23
- Joined: Tue Nov 26, 2019 11:29 pm
Re: Horn
Life would be much simpler if I just had Julian fix this darn thing!! Now it’s the challenge. I don’t want to be defeated by a silly electro magnetic device!!!
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- 356 Fan
- Posts: 23
- Joined: Tue Nov 26, 2019 11:29 pm
Re: Horn question for all you engineers?
I had a nice visit today with fellow Registry member, Martin Benade, who stopped by in his 1962 Ruby Red 356 Cab. After a look around the shop we poked around my problem horn for a bit. Although we’re not there yet Martin made a key change in the sequence of insulating washers, spring arms, hoop and contact. As Merv mentions above there seems to be an error in the hoop schematic. The top of the hoop and the longer spring steel arm are in contact. The bottom part of hoop and the lower point plate are in contact. This sequence also improves the alignment and points contact. I think this picture will show you what I’m talking about.Mervyn Hyde wrote: ↑Mon Dec 04, 2017 8:04 am He is the author of probably the best guide on restoration of these horns. I found I had made one misinterpretation in one of his diagrams, which showed the sequence of parts in the capacitor carrier. I rectified that and now have the horn working with the modern capacitor.
Martin was able to get the horn to sound, but before we could tune it we literally smoked the 10V 100 micro farad capacitor that I introduced to the circuit. The car is 6V. A big shout out to Martin who lent his Porsche experience and automotive electrics skill to help with this vexing issue. You all would have laughed if you could have seen us with our COVID masks, double teaming assembly of the contact bridge with tweezers and locking forceps.
- Martin Benade
- 356 Fan
- Posts: 12189
- Joined: Wed Nov 23, 2011 10:52 am
- Location: Cleveland, Ohio
Re: Horn
Luckily we each have 3 foot long arms so we remained 6’ apart at all times.
Cleveland Ohio
62 Cabriolet
56 VW
02 IS 300
04 Sienna
62 Cabriolet
56 VW
02 IS 300
04 Sienna
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- 356 Fan
- Posts: 98
- Joined: Sun Apr 20, 2008 1:18 pm
Re: Horn
Hi Mike, The top points need to be flip over. There is a step down on the back half of the points that the right side cap spring fit in to . That will also help to get the points straighter.
Julian
Julian