<VV> Maybe the starter

[H Smith]

Smitty says.,  Hugo I will not claim to know anything about big Diesel engines or Aston martins.  I have never worked on either and am smart enough to not contest with anyone who is experienced with them.  To do so would be more than a little stupid.  
I am smart enough to believe that my experiences with a wrench, starting when I was 12 years have to count for something.  I rebuilt my first car engine when I was 15 years old and have been greasing my hands and bloodying my knuckles Nearly every day since then.  That’s around 75 years of experience.  But to this day when someone talks of doing a mechanical problem , I listen.  There as always something new to learn.  I would never tell them that their concept is wrong or tell them what they believe is laughable.  I might ask them to try to explain a little better, but that would be the limit.
I have re read what I wrote.  It seems to me I did a reasonable job of explaining how the dragging armature occurs, which is both mechanical and friction and is contributed to by a recently run engine.  So rather than re write the whole thing I kindly suggest that you read it again.  Go deeper than the first word in each line and take your tlme.  Some people are a little slow and have a hard time grasping new concepts.  With all the respect you deserve.   Smitty


Hugo says

> One thing of which I am quite certan that this phenomenon is nothing to
> do with mechanical friction, whether in the starter or in the engine, 
> despite what others on here have suggested. I cannot conceive of 
> anything which would make any such friction vanish when everything cools 
> down. And the notion that a heavy diesel engine with over a million 
> miles on the clock would be so tight at normal running temperature that 
> a massive 24 volt starter cannot even turn it over - well that is 
> frankly laughable. I am equally certain that an engine at normal running 
> temperature will take less effort to crank than a cold engine. I thought 
> that was universal knowledge, so obvious that it wouldn't need 
>>> On 2020-08-08 05:16, H Smith via VirtualVairs wrote:
>>> I am surprised that more of you haven?t experienced the worn
>>> bushings
>>> and dragging starter syndrome.  As stated by others the bushings
>>> wear
>>> to one side due to the load of cranking against the starter/ring,
>>> gear
>>> the same direction all the time.  At this point I realize I am going
>>> to run afoul with those that believe a cool engine cranks harder  
>>> than
>>> a hot one.  In a hot engine the parts have grown to their maximum
>>> dimension.  Pistons are bigger, rings have grown in length.
>>> Everything in well lubed and oil has closed tolerances .  In the
>>> starter the armature moves sideways into the worn area of the
>>> bushings.  It starts to turn and runs into the marginally heavier
>>> load
>>> of the hot engine.  Due to the worn bushings it is running closer to
>>> the field.  It starts drawing a ton of current from what is a
>>> normally
>>> well charged battery.  More magnetism than normal which snatches the
>>> armature solid sideways against the field coil. It?s not going to
>>> turn
>>> till the key is released or the battery goes dead.
>>> I request that if anybody wants to challenge this that they pull
>>> their starter and look at the drag marks on the field cores and/or
>>> armature cores where they have been rubbing together.
>>> This is not to say that a bad solenoid ,corroded battery clamp, or
>>> other connection can?t exhibit similar side effects   Smitty
>>> L