Conductive compound on Rotor? (1 Viewer)

Joined
Feb 12, 2004
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1,190
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Tampa
 
I picked up some parts for a tuneup and noticed that the distributor rotor has some sort of conductive coating on the end of it. I was bored so I took some pics. This is a factory Toyota Denso part, P/N 19102-61240. What is this mystery compound - some sort of conductive carbon cement? Does it serve as some sort of anti-fouling aid? I don't think I've seen this on other rotors found on domestics I've wrenched on in the past. Also, CDan or anyone, what does the date code stamped on the bottom translate to?
 
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Bambusiero

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Apr 11, 2005
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687
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Chandler, AZ
 
 
 
I just replaced the rotor on my Toyota Previa van (OEM part) and I noticed the very same rough gritty texture as you show. I'm guessing here, but sharp pointy shapes promote high electrical field strengths, and therefore sparks, so I think that the rough surface encourages the spark to form anywhere along the rotor as it turns past the wire contact post.
 
Joined
Feb 12, 2004
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1,190
Location
Tampa
 
Can anyone decipher the date code? It's not that important - just curious.
 

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