newBeta
New Member
Hi Stu;
1) Fits 90% maybe but it explains the points (hopefully helping understanding) rather than giving an over-simplified response that could get some users in trouble.
2) 'it bit of overcrankin' is a rather odd misquote of my post - certainly doesn't equate to 'CONTINUOUS OPERATION OF STARTER MOTOR' or 'running your starter motor hard'. To help me understand any possible mistake in my post, could explain the link between 'bit of overcrankin!' and CONTINUOUS OPERATION OF STARTER MOTOR'/'running your starter motor hard'? Thanks.
The main reason for a compact high power electric motor - like the starter motor - can produce such high powers without damage - is there is not time for heat to build up when used correctly.
When abused, it exceeds operating temperature and this often causes dramatic problems;
a) The brushes do wear exponentially faster.
b) When the brush holder get hots, it can misshape*
c) The 'bearings/bush clearances can become much tighter when overheated. Harder to turn, more heat, more brush wear.
* If the brushes are already shortened (either by correct use or abuse). As a brush gets shorter, the spring pressing it onto the commutator exerts less force. When the brush holder get hots, it can misshape making it even harder for the brush to connect with the commutator - resulting in even faster wear.
The point being that you have multiple problems stacking up.
If a (probably very well meaning) guy has cranked your starter motor way past its operating temperatures (for a prolonged period or several times in short succession), please do not rely on that starter motor until you have confirmed that the abused unit still has adequate brushes/grease/bearings/bushes.
Hope that clarifies.
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