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#12
02-06-2018, 05:37 AM
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Dead spots on commutator is a very popular failure mode on a starter. On starters where you can get a screwdriver into the armature and turn it a smidge is the easiest to help along.
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2011 E70 • N55 (me) 2012 E70 • N63 (wife) 
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#13
02-06-2018, 08:36 PM
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Finally got the starter out and took it apart. 2 of the 4 brushes are worn right to the end which would have been causing the problem. The carbon buildup inside makes me surprised that it worked in the first place. I was hoping I could replace the brushes but the wire leads are spot welded to the field windings. Even if I could get hold of a spot welder I wouldn't be able to get in there to fix.
I hate throwing away parts that could be fixed, but it looks like I am going to have to source a new starter motor.
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2004 E53 diesel. Titan silver on black Sports package
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#14
02-06-2018, 09:08 PM
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On this side of the pond, there are shops that rebuild starters and alternators. Check around to see if they have any down under.
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2006 Infiniti G35 2001 BMW 3.0I E53 X5 Build date 08/2000 SOLD Lotus Europa 1970 Destroyed by fire Lotus Europa 1970 S2 Renault Powered Lotus Type 52 1970 Twincam Webers Powered PORSCHE 911 Targa 1982 The Garage Queen Audi Avant donated to Kars for Kids BMW 525IT Sold Audi 4000CS Quattro Sold Jensen Healey Lotus Powered Sold Opel 1900 Sold Triumph Spitfire 1971 Sold Triumph Spitfire 1968 Sold Plymouth "Cuda" 340 Six pack SOLD
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#15
02-06-2018, 09:26 PM
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The lead that is spot welded should be copper. Cut leaving a nub and solder in the replacement.
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__________________
2011 E70 • N55 (me) 2012 E70 • N63 (wife)
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#16
02-08-2018, 06:14 PM
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Ordered new starter, should be arriving today. I will keep the old one and see if I can repair at a later date.
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2004 E53 diesel. Titan silver on black Sports package
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#17
02-08-2018, 07:26 PM
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That's smart thinking if you take apart post photos
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2011 E70 • N55 (me) 2012 E70 • N63 (wife)
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#18
02-08-2018, 11:37 PM
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New starter motor is in. It has never cranked so fast since I've had it. Problem solved.
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2004 E53 diesel. Titan silver on black Sports package
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#20
02-09-2018, 06:17 AM
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The starter was probably using excessive current it seems to be the way they go at end of life sometimes double the normal current.
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__________________
2011 E70 • N55 (me) 2012 E70 • N63 (wife)
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