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02-05-2014, 11:09 PM | #1 |
Senior Member
Join Date: Dec 2013
Location: Wellsford - NZ 0900
Posts: 214
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'47 Merc starter motor question.
Hi all,
Yesterday while pondering starting issues, I noticed the battery cable connection to the starter motor was loose. Tried tightening it only to discover that the thread on the brass stud is so beat it's almost non-existent, so the 1/2" nut just spins around. Not a prob (I thought to myself), I'll just drop the starter motor out and re-cut a new thread onto the existing stud. Getting the starter out proved easy as pie. When I took a closer look at the battery connection it became obvious that the solder joint to the stud inside the motor has failed, causing a bad connection (the terminal becomes hot while cranking). Has anyone tried re-soldering these connections without completely dismantling the motor? |
02-06-2014, 12:07 AM | #2 |
Senior Member
Join Date: May 2010
Location: on the Littlefield
Posts: 6,140
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Re: '47 Merc starter motor question.
To me completly dismantling is removing the field coils ---this doesn't need to happen
I doubt you can get enough heat to the connection to properly solder it without taking the armature out, and you need a good sized soldering iron, too small of an iron will heat things too hot and chance of damaging insulation, at least a 3-400 watt iron, I use a 600 watt iron and it heats the junction in a few seconds(about5) to soldering heat, this way the heat doesn't travel too far ---a long time ago I used 2 150 watt guns, the insulation was smoking some after the 30 seconds to a min it took to heat and everything got hot. There used to be a replacement "stud" that fit over the stripped one( try the "HELP" brand at auto parts store), but if you have to go in you might as well replace it with a new one ---and remember that you want new nuts too, the power flow is from the stud to the threads--then to the side of the nut to the terminal ----and if a washer is used it can't be corroded too ---rusty nuts could have been the start of your problem |
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02-06-2014, 02:44 AM | #3 |
Senior Member
Join Date: Dec 2013
Location: Wellsford - NZ 0900
Posts: 214
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Re: '47 Merc starter motor question.
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