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Joined: Nov 2004
Posts: 47
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Nov 2004
Posts: 47 |
Occasionally my 1950 235cu.in. 6 volt standard point system ignition will backfire.I hope one of you can tell me what to look at. The engine runs fine normally. No missing or run-on. Thanks
Satisfaction is the death of desire.
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Joined: Feb 2002
Posts: 1,178
ChatMaster - 1,000
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ChatMaster - 1,000
Joined: Feb 2002
Posts: 1,178 |
A backfire thru the carb is usually caused by timing, could be an intake valve haniging up and not closing properly, also could be an occasional cross fire in the distributor cap or a cross fire from spark plug wires touching.
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Joined: Jan 2002
Posts: 30,701 Likes: 141
ChatMaster - 25,000
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ChatMaster - 25,000
Joined: Jan 2002
Posts: 30,701 Likes: 141 |
Does it back fire thru the exhaust or thru the carburetor (air cleaner)??
Gene Schneider
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Joined: Nov 2004
Posts: 47
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Nov 2004
Posts: 47 |
I'm sorry, it back fires thru the exhaust.
Satisfaction is the death of desire.
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Joined: Jan 2002
Posts: 30,701 Likes: 141
ChatMaster - 25,000
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ChatMaster - 25,000
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A backfire thru the exhaust is usually caused by an interuption in the ignition.When the ign. is interupted for a second or two fuel continues to flow thru the manifold.When the fuel hits the hot muffler/exhaust it explodes - which is the back fire.Can cause the muffler to blow-up if its bad enough.
An example is if you drive along and turn the key off and back on.If the muffler is hot and the gas pedal is depressed you will usually get a back-fire.
Cause?..I would begin by checking all wire connections,the lead wire from the coil to the side of the distributor (can have broken wire inside of insulation) and reolace the condenser...I assume that the points are OK and correctly adjusted.
Keep us posted.
Gene Schneider
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Joined: Nov 2004
Posts: 47
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Nov 2004
Posts: 47 |
I will check it out when the sun rises in the west. Stay tuned....Thanks
Satisfaction is the death of desire.
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Joined: Dec 2001
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ChatMaster - 10,000
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ChatMaster - 10,000
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Fifty, seventy seven, that may be too late to fix your car! What else could we do to help you?
Brang it by my shop and I'll check her out!
Life's a long winding trail, love Jesus and ride a good horse!
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Joined: Nov 2004
Posts: 47
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Nov 2004
Posts: 47 |
orry guy's for the long delay in reporting back to you. I checked all of the wires and they all have good connections. The points have no pit marks from arcing. I did find however, that the inside of the distributor had small metal filing that is coming from the rotor tip rubbing on the inside of the distributor cap. A few of the spark plug terminals inside the cap have been ground down a 1/16 of inches or so. It seems that the distributor shaft has excessive side movement in it. Any suggestions? It is still has a 6 volt system distributor.
Satisfaction is the death of desire.
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Joined: Nov 2001
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Tech Advisor ChatMaster - 25,000
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Tech Advisor ChatMaster - 25,000
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Sounds like you might have a bent distributor shaft. :( :( :(
The Mangy Old Mutt
"If It's Not Junk.....It's Not Treasure!"
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