I have a 1980 Dodge 1/2 ton pickup with a 318, I use for snowplowing. After it has been running for 45 minutes, if I shut it off it will not start. It will not even roll over. The battery is fine. After sitting for awhile it will start right up. Last night it took about 15 minutes in 10 F weather. Is some electrical component heating up? Any thoughts greatly appreciated.
2006-12-08 00:55:09 · 3 answers · asked by cobbiebook 2 in Cars & Transportation ➔ Maintenance & Repairs
The starter is bad. When a starter wears out, the end bushings (bearings) that are on each end of the armature get bigger with heat. This is because metal expands and contracts to heat. When the bearings expand the armature is allowed to bind. The fields around the armature are magnetic, and run very close to the armature anyway. Once the armature cocks it is grabbed by the magnetic field plates and locks down. When the bearings cool down they become smaller and frees up the armature to rotate again. The starter is completely worn out, and/or is missing a heat shield to keep the header pipes from heating it up too much. Another thing that will do this is; the brushes that carry electrical current to the armature are made of carbon, and wears over a period of time. They are spring loaded to keep them pushed up against the contact points on the armature. Once they are worn really bad, they will no longer make enough contact to turn the armature. Once it cools down they will then again make enough contact to turn the armature. I have did this many times. Crawl under the vehicle with a hammer while a friend holds the switch to the start position. Now smack the starter in the front (where the brushes run) and it will start working, or you can just wait till it cools down. Tap around the front of the starter that is closest to the front of the vehicle. Don't hit it so hard that you break something, but a couple of good taps to the front plate, and around the front 1/4 of the starter will do the trick.
Glad I could Help you. Good Luck!!!
2006-12-08 01:20:40 · answer #1 · answered by Anonymous · 0⤊ 0⤋
it is probably the solenoid. but u will have to have it cked when it fails to isolate it. u could just throw another one on from ajunk yard. and a starter too.that way it won't be alot of money on an iffy guess.
2006-12-08 09:05:23 · answer #2 · answered by spotlite 5 · 0⤊ 1⤋
What do you mean, won't roll over? Ya mean the starter does not turn?
2006-12-08 09:02:34 · answer #3 · answered by done wrenching 7 · 0⤊ 1⤋