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Re: 400 engine/starting
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Posted by RKS on May 05, 1999 at 20:21:43:
In Reply to: 400 engine/starting posted by karl fischer on May 05, 1999 at 16:16:22:
sounds like they didn't time the engine right. It probably isn't the valve timing (cam). If you know how and have the equipment, then try to set the idle timing with the engine warm at about 450 rpm, and advance the timing about 2-5 degrees before whatever the specs call for. If you can't do this, you need to have it done. Setting the points dead on is good, but not enough. Setting the points is really setting the "dwell angle" and dwell has a dramatic effect on timing. When that engine was new, gasoline was better octane than today. You can compensate slightly for poorer detonation by advancing the timing slightly. I don't think you have a starter or charging problem. It's probably the cover-up of excessive battery run down trying to start it. Try putting a trickle charger on it overnight. If it turns over strong and cranks better, then you know to check the battery and charging system, and clean up wires and contacts. With a voltmeter on the battery, when you engage the starter, the volts should not drop way under about 5- 5 1/2 volts. If a charged battery kicks way way down on start, you have a bad battery. Not sure why it "diesels" - all I can think is poor timing is causing it to run hot, since those are relatively low compression engines, and hot is all I can relate to dieseling. You could have a partial short somewhere (happened to me on a Ford 600) and the primary winding of the coil is getting voltage, which would allow the coil to fire even with the ignition off. My 600 had to be choked down until I found the short within the old original harness which was dried and cracked and I rebuilt it. Look for shorts. RKS
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