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1967 - 1972 F-100 & Larger F-Series Trucks Discuss the Bumpsides Ford Truck

Engine cranking

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Old Mar 15, 2017 | 08:40 AM
  #16  
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Originally Posted by 6869hoss
I've not checked the compression but the engine is stiff and when I hand turn it you can hear the exhaust valves open and release the air. And when cranking the wire to the starter gets really hot. I'm going to try getting a new starter today and see if that is the issue.
I was asking for static (i.e. calculated) compression ratio out of curiosity...nothing to do with your cranking issue.

Back to the cranking issue.... Hot wires means too many amps often due to low voltage. Will only take a moment to check volts that are actually getting to your starter. A new starter might fix it, but if it doesn't then you're back to the quick and easy tests you should do in the first place. I had a two year old solenoid and starter on a motor that cranked slow for me last summer. Turned out to be the solenoid...found it with a voltage test.

What do mean by cranking? That motor should fire right up before the wire has a chance to get hot.
 
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Old Mar 15, 2017 | 08:43 AM
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Originally Posted by Tedster9
Do yourself a favor and replace the cables while you're at it. Block, firewall, solenoid, frame.
2X...I've also fixed slow crank with new battery clamp. You may just have a bad ground, bad wire, etc.
 
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Old Mar 15, 2017 | 08:54 AM
  #18  
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Good grounding costs next to nothing, those old cables act more like resistors after all this time. Restores charging and ignition voltages back where they need to be.
 
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Old Mar 15, 2017 | 11:45 AM
  #19  
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Hey thanks everyone for the help and suggestions. I replaced the starter today and I'm waiting for the battery to charge. But with the dead battery is was already spinning much faster. Thanks.
 
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Old Mar 15, 2017 | 12:43 PM
  #20  
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Are you cranking a new engine until the battery gets weak without firing the engine? Usually want it to fire right away and get the rpms ups to 2000 or little more to start oil splashing... especially if you have flat tappet lifters.
 
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Old Mar 15, 2017 | 08:46 PM
  #21  
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Originally Posted by 6869hoss
Hey thanks everyone for the help and suggestions. I replaced the starter today and I'm waiting for the battery to charge. But with the dead battery is was already spinning much faster. Thanks.
Please return an let us know how it all turned out.
Thanks
Orich
 
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Old Mar 16, 2017 | 01:32 PM
  #22  
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Make sure you remembered to install the engine block to firewall ground cable.
 
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