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> Distributor cap nubbin, Whats its purpose?
74ravenna
post Dec 12 2015, 10:05 AM
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While cleaning electrical contacts of corrosion I just had to reach in and touch the Nubbin I'm holding in this picture, so of course it popped out.
I've managed to put it back in but I'm not sure I trust that its in securely.
It now leans like the tower of pisa in its little receptacle.
So to most of you out there this is a very basic item but I don't know what it does or if I can trust that its back in correctly.
An explanation is greatly welcome.

Thanks.


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DBCooper
post Dec 12 2015, 10:16 AM
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It's the carbon contact between the main lead in the center of the cap that carries current from the coil lead through the rotor to each of the spark plug leads. Spring loaded to keep it in contact as the rotor spins. If it's leaning it's in crooked and probably won't last very long, will be spun out and your car will stop dead almost certainly in the middle of a very busy intersection.
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74ravenna
post Dec 12 2015, 10:24 AM
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QUOTE(DBCooper @ Dec 12 2015, 11:16 AM) *

It's the carbon contact between the main lead in the center of the cap that carries current from the coil lead through the rotor to each of the spark plug leads. Spring loaded to keep it in contact as the rotor spins. If it's leaning it's in crooked and probably won't last very long, will be spun out and your car will stop dead almost certainly in the middle of a very busy intersection.



Excellent explanation. I will keep messing with it until its in correctly.

Thanks so much for the help.
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fixer34
post Dec 12 2015, 12:03 PM
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I don't think there is much 'messing' you can do with it. One end of the carbon rod should be smaller-it fits into the spring inside the cap, that's what holds it in place. It may not be perfectly straight in the cap, but it shouldn't lean too much either. Might be time for a new cap.
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Spoke
post Dec 12 2015, 01:00 PM
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QUOTE(fixer34 @ Dec 12 2015, 01:03 PM) *

Might be time for a new cap.


(IMG:style_emoticons/default/agree.gif)

If you can convince yourself the contact is secure and won't fall out, keep the cap. The downside to having this issue as mentioned is having to push your car home. A new cap is never a bad idea.
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74ravenna
post Dec 12 2015, 01:01 PM
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QUOTE(fixer34 @ Dec 12 2015, 01:03 PM) *

I don't think there is much 'messing' you can do with it. One end of the carbon rod should be smaller-it fits into the spring inside the cap, that's what holds it in place. It may not be perfectly straight in the cap, but it shouldn't lean too much either. Might be time for a new cap.



Hi fixer34,

Its funny, no matter how much i tried I couldn't get it to stay in unless it was way crooked. I also thought it might be time for a new cap, but once I went onto 914world and asked the question and got an answer (thanks dbcooper) within a minute I had it fitting about 95% straight and it seems to be in quite securely.

Thanks.
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sixnotfour
post Dec 12 2015, 01:05 PM
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you need a bosch cap or better quality with brass terminals
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boxsterfan
post Dec 12 2015, 02:49 PM
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I would drop $10 on a new cap.
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DBCooper
post Dec 12 2015, 03:03 PM
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QUOTE(boxsterfan @ Dec 12 2015, 12:49 PM) *

I would drop $10 on a new cap.



+4 A lot of times when you're in college and broke you can put the contact back in successfully but you never know, and then when they fail it's ALWAYS when it's most inconvenient and raining. Ten bucks, cheap, good insurance, no worries.

By the way, looking at your photo I didn't see the spring it seats into. Maybe it's in place, I don't know, can't really see into the hole.
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Shadowfax
post Dec 12 2015, 04:12 PM
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Not sure if the 2.0 caps are the same as 1.7 or 1.8 but I have a spare 2.0 cap you can have. It's Bosch or Bremi -- can't remember offhand -- with a few hundred miles on it. PM me if you're interested and I'll get it mailed out Monday.
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TheCabinetmaker
post Dec 12 2015, 04:13 PM
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I agree with sixer. Get a new cap. A Bosch cap!! You'll be "miles ahead".
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ripper911
post Dec 12 2015, 05:03 PM
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I don't think I've ever noticed that piece. (IMG:style_emoticons/default/huh.gif)

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r_towle
post Dec 12 2015, 05:15 PM
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Get two caps, keep one in the trunk.
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74ravenna
post Dec 12 2015, 05:42 PM
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Thanks all for the great advice. I will certainly get a new cap (or two!)
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r_towle
post Dec 12 2015, 06:57 PM
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A) what is your name and real location?

B) Northern Foreign Auto Parts in Nashua, they will,have,what you need....

Rich
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74ravenna
post Dec 12 2015, 07:38 PM
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QUOTE(r_towle @ Dec 12 2015, 07:57 PM) *

A) what is your name and real location?

B) Northern Foreign Auto Parts in Nashua, they will,have,what you need....

Rich


A) Steve

B) Kensington
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r_towle
post Dec 12 2015, 09:09 PM
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Steve, glad to meet.

John , Wndsnd is near you, so is
Gandalf and Scotty.

There must be a local foreign place for parts nearby....but if you need any used stuff, feel free to reach out, I have a decent stash.

Rich
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