BRASS FILINGS INSIDE DISTRIBUTOR

[David SelfridgeParticipant]

HI

I have developed a slight misfire above 45mph although the car runs well under 45mph,  ticks over evenly and pulls nicely.            I removed all plugs, which turned out fine except number 2, just slightly oiled, not having nice brown tip like the rest, have now renewed this plug. Removed the distributor cap and found a few brass filings inside and over the points, cleaned points and blew out with airline. I think the filings may be the problem (haven’t tried on the road yet) I recently fitted a new distributor cap as the old one had developed a crack, the original rotor arm was not replaced.  CAN ANYONE HELP.

Davy

 

 

• This topic was modified 5 years, 11 months ago by David Selfridge.

[David FaulknerParticipant]

Check the strainer in the fuel feed at the carb, it may be low on fuel at speed under load. Even with a new filter before the pump I had sludge in mine…

Coil OK, not getting overheated?

• This reply was modified 5 years, 11 months ago by David Faulkner.

[Roger GrixParticipant]

Hi Davy,

It sounds as though the rotor is catching on the terminals inside the distributor cap. The old distributor cap will probably have had wear on the terminals.

Do you have play on the distributor shaft? If you do, that could be allowing the rotor to touch the terminals. That may be what cracked the old cap.

Brass filings floating around could well be causing the sparks to track across to earth.

The fact that N02 was fouled could indicate a dodgy plug lead.

Roger

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